CN103299073B - Many pumps unit, duplex pump unit and working truck - Google Patents

Many pumps unit, duplex pump unit and working truck Download PDF

Info

Publication number
CN103299073B
CN103299073B CN201280004683.7A CN201280004683A CN103299073B CN 103299073 B CN103299073 B CN 103299073B CN 201280004683 A CN201280004683 A CN 201280004683A CN 103299073 B CN103299073 B CN 103299073B
Authority
CN
China
Prior art keywords
mentioned
oil
pump
oil hydraulic
face
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201280004683.7A
Other languages
Chinese (zh)
Other versions
CN103299073A (en
Inventor
辻智之
清冈晃司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanmar Co Ltd
Original Assignee
Yanmar Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2011002140A external-priority patent/JP5702156B2/en
Priority claimed from JP2011051025A external-priority patent/JP5576323B2/en
Application filed by Yanmar Co Ltd filed Critical Yanmar Co Ltd
Publication of CN103299073A publication Critical patent/CN103299073A/en
Application granted granted Critical
Publication of CN103299073B publication Critical patent/CN103299073B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H39/00—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution
    • F16H39/02—Rotary fluid gearing using pumps and motors of the volumetric type, i.e. passing a predetermined volume of fluid per revolution with liquid motors at a distance from liquid pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/043—Transmission unit disposed in on near the vehicle wheel, or between the differential gear unit and the wheel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K17/00—Arrangement or mounting of transmissions in vehicles
    • B60K17/04—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing
    • B60K17/10—Arrangement or mounting of transmissions in vehicles characterised by arrangement, location, or kind of gearing of fluid gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K7/0015—Disposition of motor in, or adjacent to, traction wheel the motor being hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F04B23/06—Combinations of two or more pumps the pumps being all of reciprocating positive-displacement type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38—Control of exclusively fluid gearing
    • F16H61/40—Control of exclusively fluid gearing hydrostatic
    • F16H61/44—Control of exclusively fluid gearing hydrostatic with more than one pump or motor in operation
    • F16H61/448—Control circuits for tandem pumps or motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K7/00—Disposition of motor in, or adjacent to, traction wheel
    • B60K2007/0061—Disposition of motor in, or adjacent to, traction wheel the motor axle being parallel to the wheel axle

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

First and second port block have the axis hole of inserting for pump shaft, a pair working oil path, an end outside surface opening the supplementary oil circuit of mineralization pressure oil receiving port, an end to be connected with above-mentioned supplementary oil circuit fluid and the other end at end face opening and formed connecting port branch's oil circuit this put common.Above-mentioned connecting port, under the state of the axis through above-mentioned axis hole, is positioned at along in the imaginary plane of the first direction, plate face and thickness direction.The pressure oil receiving port supply pressure oil of Xiang Yifang, the pressure oil supply port of the opposing party is blocked by embolism.A side only in the first and second port block assembles the relief valve set the oil pressure of supplementary oil circuit.

Description

Many pumps unit, duplex pump unit and working truck
Technical field
The present invention relates to comprise the first and second oil hydraulic pump many pumps unit, arranged in series the first and second oil hydraulic pump duplex pump unit and possess the working truck of above-mentioned duplex pump unit.
Background technique
The many pumps unit comprising the first and second oil hydraulic pump was just known in the past, such as, in following patent documentation 1, disclosed many pumps unit of the amphistyly of arranged in series first and second oil hydraulic pump.
Many pumps unit of the amphistyly that above-mentioned patent documentation 1 is recorded is configured to, supply from single make-up pump, and will have been carried out the pressure oil of hydraulic pressure setting by single relief valve to the first oil hydraulic circuit formed by the first oil hydraulic pump and the second oil hydraulic circuit both sides supply formed by the second hydraulic pump unit, seeking, this point of simplification to the makeup oil supplying structure of the above-mentioned first and second oil hydraulic circuit is useful.
But, in many pumps unit that above-mentioned patent documentation 1 is recorded, can only so that the mode of the above-mentioned first and second oil hydraulic pump arranged in series be used, the versatility that there is component parts is short of such problem.
Be described in detail, above-mentioned patent documentation 1 discloses many pumps unit of the amphistyly relevant to first and second method.
The pump unit of above-mentioned first method possesses single port block, with the first oil hydraulic pump of the first end face sliding contact of the thickness direction one side side of above-mentioned port block, with the first pump casing linked around the mode of above-mentioned first oil hydraulic pump and above-mentioned first end face of above-mentioned port block, with the second oil hydraulic pump of the second end face sliding contact of thickness direction the opposing party side of above-mentioned port block, with the second pump casing linked around the mode of above-mentioned second oil hydraulic pump and above-mentioned second end face of above-mentioned port block.
In the pump unit of above-mentioned first method, above-mentioned single port block makes common parts relative to the above-mentioned first and second oil hydraulic pump both sides, therefore, independently can not arrange the above-mentioned first and second oil hydraulic pump.
Further, above-mentioned single port block becomes special parts relative to the duplex pump unit of above-mentioned first method, versatility is short of.
On the other hand, the pump unit of above-mentioned second method possesses: the first and second oil hydraulic pump; Single pump casing, it has the first opening can inserted for above-mentioned first oil hydraulic pump in axial direction one side side, and has the second opening can inserted for above-mentioned second oil hydraulic pump in axial direction the opposing party side; The first end buccal mass linked with said pump shell, to block above-mentioned first opening under the state by above-mentioned first oil hydraulic pump sliding contact; And the second port block to link with said pump shell, to block above-mentioned second opening under the state by above-mentioned second oil hydraulic pump sliding contact.
In the pump unit of above-mentioned second method, above-mentioned single pump casing is made into the parts of collecting the above-mentioned first and second oil hydraulic pump both sides, therefore, same with above-mentioned first method, independently can not arrange the above-mentioned first and second oil hydraulic pump.
Further, above-mentioned single pump casing makes special parts relative to the pump unit of above-mentioned second method, versatility is short of.
In addition, each of the duplex pump unit of above-mentioned first and second method that above-mentioned patent documentation 1 is recorded (hereinafter referred to structure in the past) is applied to working truck, cooperate with first oil hydraulic motor of the side operatively driven in pair of driving wheels to make above-mentioned first oil hydraulic pump, form a HST, and above-mentioned second oil hydraulic pump cooperates with second oil hydraulic motor of the opposing party operatively driven in above-mentioned pair of driving wheels, form the 2nd HST, therefore, above-mentioned duplex pump unit possesses for above-mentioned first and the 2nd HST make-up pump that plays a role of oil sources as a supplement.
Be described in detail, above-mentioned structure is in the past provided with a pair first oil hydraulic pump working oil path of a part for a pair working oil pipeline formed in an above-mentioned HST, form a pair second oil hydraulic pump working oil path of a part for a pair working oil pipeline in above-mentioned 2nd HST, for the supplementary oil circuit of the first oil hydraulic pump that the pressure oil from above-mentioned make-up pump is supplied to above-mentioned a pair first oil hydraulic pump working oil path, for the supplementary oil circuit of the second oil hydraulic pump that the pressure oil from above-mentioned make-up pump is supplied to above-mentioned a pair second oil hydraulic pump working oil path, the above-mentioned first and second oil hydraulic pump oil pressure supplementing oil circuit is set by above-mentioned single relief valve.
But, in above-mentioned structure in the past, above-mentioned relief valve is configured in by the side side, spin axis direction one of the above-mentioned first and second oil hydraulic pump of arranged in series, and the discharge oil from above-mentioned relief valve is discharged to the pump space of a side of the oil hydraulic pump of the side close to above-mentioned relief valve in collecting the above-mentioned first and second oil hydraulic pump.
The oily opening be connected with the pump space fluid of the opposing party of the oil hydraulic pump from the side that above-mentioned relief valve leaves in collecting the above-mentioned first and second oil hydraulic pump in the pump space of one side is provided with in above-mentioned structure in the past, accordingly, the both sides of discharge oil throughout the pump space to the pump space of one side and above-mentioned the opposing party in the pump space of one side are flow into from above-mentioned relief valve.
But the oil in reserve of above-mentioned patent documentation 1 to the pump space in the pump space and above-mentioned the opposing party that make one side circulates, and effectively prevents the situation that the temperature of oil in reserve rises positively, not open and enlightenment.
At first technical paper
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2001-116107 publication
Summary of the invention
The present invention is the invention of making in view of the conventional art, its first object is to provide a kind of simply constructed many pumps unit, the oil pressure of supplementary oil circuit of the both sides of the first and second oil hydraulic pump can be set by single relief valve, and the type of service that makes the duplex form of the above-mentioned first and second oil hydraulic pump attached in series and separately configure the pump unit comprising above-mentioned first oil hydraulic pump and the pump unit comprising above-mentioned second oil hydraulic pump can be selected.
In addition, the second object of the present invention is to provide a kind of duplex pump unit and possesses the working truck of above-mentioned duplex pump unit, this duplex pump unit is by the first and second oil hydraulic pump arranged in series, with low costization because the reduction of number of spare parts brings can be sought, and effectively prevent the temperature of the oil in reserve of accommodating in the first and second pump space of the above-mentioned first and second oil hydraulic pump from rising.
The present invention, in order to realize above-mentioned first object, provides a kind of many pumps unit, and described many pumps unit comprises: the first oil hydraulic pump, first end buccal mass, its have for above-mentioned first oil hydraulic pump sliding contact directly or indirectly the first end face and with second end face of above-mentioned first end face in the opposite side of thickness direction, first pump casing, it is to link around the mode of above-mentioned first oil hydraulic pump and the first end face of above-mentioned first end buccal mass, second oil hydraulic pump, second port block, its have for above-mentioned second oil hydraulic pump sliding contact directly or indirectly the first end face and with second end face of above-mentioned first end face in the contrary side of thickness direction, with the second pump casing, it is to link around the mode of above-mentioned second oil hydraulic pump and the first end face of above-mentioned second port block, the common point of the above-mentioned first and second port block is to have: axis hole, described axis hole is by through between the above-mentioned first and second end face, so that confession drives the pump shaft of corresponding oil hydraulic pump to insert, a pair working oil path, described a pair working oil path has pair of parallel portion, this pair of parallel portion relatively extends on the first direction, plate face of above-mentioned port block with the state of symmetry mutually across above-mentioned axis hole, and at above-mentioned first end face opening to be connected with above-mentioned hydraulic pump fluid, and the end surface opening outside of described a pair working oil path, forms a pair supply and discharge port, supplement oil circuit, the end surface opening outside of described supplementary oil circuit, mineralization pressure oil receiving port, and the other end is branched, and is connected respectively through safety check with above-mentioned a pair working oil path fluid, with branch's oil circuit, one end of described branch oil circuit is connected with above-mentioned supplementary oil circuit fluid, and the other end is at above-mentioned second end face opening, form connecting port, above-mentioned connecting port is with the state of the axis through above-mentioned axis hole, be positioned at along in the imaginary plane of the thickness direction of above-mentioned first direction, plate face and above-mentioned port block, a side in the above-mentioned pressure oil receiving port of above-mentioned first end buccal mass and the above-mentioned pressure oil receiving port of above-mentioned second port block is connected with pressure oil supply source fluid, and the opposing party is blocked by embolism, the relief valve of the oil pressure of the above-mentioned supplementary oil circuit of side's assembling setting only in the above-mentioned first and second port block.
According to many pumps unit of the present invention, the oil pressure map of the supplementary oil circuit of the both sides of the above-mentioned first and second port block can be carried out by single relief valve, and can select by the double structure of the first and second oil hydraulic pump arranged in series and make the above-mentioned first and second oil hydraulic pump mutually relatively separate configurations independently structure is set.
Especially in above-mentioned double structure, because by two ends buccal mass being linked under the state making the second end face of the above-mentioned first and second port block against each other, and make the above-mentioned connecting port of two ends buccal mass connected to each other, so, additional parts need not be equipped with, just can realize the oil pressure map of the supplementary oil circuit of the both sides undertaken by above-mentioned single relief valve.
The second overflow discharge oil circuit that the first overflow discharge oil circuit that the pump space being preferably provided with the side formed to the port block by one side with corresponding pump casing by the oil overflow from above-mentioned relief valve guides, the pump space of the opposing party formed to the port block by the opposing party not assembling above-mentioned relief valve with corresponding pump casing by above-mentioned oil overflow guide.
In this case, above-mentioned first overflow discharge oil circuit is formed on the port block of one side, and to make an end be connected with above-mentioned relief valve fluid, and the other end is at the first end face opening, is connected with the pump space fluid of one side.
On the other hand, above-mentioned second overflow discharge oil circuit can comprise: be formed at the upstream side part in the port block of one side, and to make an end be connected with above-mentioned relief valve fluid, and the other end is at the second end face opening; With the downstream side part of port block being formed at above-mentioned the opposing party, to make an end at the second end face opening, to be connected with above-mentioned upstream portion shunting body, and the other end is at the first end face opening, and is connected with the pump space fluid of above-mentioned the opposing party.
Be formed with at least one party of the port block of one side and the pump casing of correspondence the discharge port externally opened in the pump space formed by both, be formed with at least one party of the port block of above-mentioned the opposing party and the pump casing of correspondence the discharge port externally opened in the pump space formed by both.
In a mode, each of the above-mentioned first and second port block has and extends and the first ~ four side that the periphery of the above-mentioned first and second end face is linked at thickness direction.Above-mentioned first and second side is respectively towards above-mentioned first side side, direction one, plate face and the opposing party side, and the above-mentioned 3rd and the 4th side is respectively towards second plate face direction one side side and the opposing party side orthogonal with above-mentioned first direction, plate face.
In this case, the above-mentioned first and second port block each on formed: a pair first perforation, mutually relatively extend in above-mentioned first direction, plate face with the state of symmetry across above-mentioned axis hole, and an end and the other end are respectively at the above-mentioned first and second lateral opening; Second perforation, its compared with above-mentioned axis hole close to the side of above-mentioned second side, the mode be communicated with between above-mentioned a pair first perforation to be extended along above-mentioned second direction, plate face, and an end and the other end are respectively at the above-mentioned 3rd and the 4th lateral opening; 3rd perforation, one end is at above-mentioned second lateral opening, and bore a hole in the other end and above-mentioned second, fluid is connected; With the 4th perforation, one end and the above-mentioned 3rd fluid of boring a hole is connected, and the other end is at above-mentioned second end face opening, forms above-mentioned branch oil circuit.
Above-mentioned a pair first perforation, by being blocked by the other end embolism, form above-mentioned a pair working oil path that an end is played a role as above-mentioned supply and discharge port.
By inserting above-mentioned safety check respectively from an above-mentioned biperforate end and the other end, under the state that an end of above-mentioned 3rd perforation plays a role as above-mentioned pressure oil receiving port, above-mentioned second perforation and above-mentioned 3rd perforation form above-mentioned supplementary oil circuit.
Have again, 5th perforation and the 6th perforation is also set in the above-mentioned first and second port block, in the port block of a side of the above-mentioned relief valve of assembling, 5th perforation is extending along above-mentioned second direction, plate face close to the side of above-mentioned second side compared with above-mentioned axis hole, to make an end at above-mentioned 3rd lateral opening, and bore a hole in the other end and the above-mentioned 3rd, fluid is connected, and described 5th perforation forms the relief valve patchhole inserted by above-mentioned relief valve from an above-mentioned end; Described 6th perforation is under the state of through above-mentioned 5th perforation, one end and the other end are at the above-mentioned first and second end face opening, on the other hand, the port block of the opposing party of unassembled above-mentioned relief valve arranges the 7th perforation, one end is at above-mentioned second end face opening, so that the other end fluid of boring a hole with the above-mentioned 6th is connected, and the other end is at above-mentioned first end face opening.
The part be positioned near the first end face compared with above-mentioned 5th perforation in above-mentioned 6th perforation forms above-mentioned first overflow discharge oil circuit, and the part and the above-mentioned 7th being positioned at close second end face compared with above-mentioned 5th perforation in above-mentioned 6th perforation is bored a hole and formed above-mentioned second overflow discharge oil circuit.
Preferably the above-mentioned first and second port block each on formed the 8th perforation, it is extending on above-mentioned second direction, plate face close to the side of above-mentioned first side compared with above-mentioned axis hole.
Under the state of side's opening of one end in the above-mentioned 3rd or the 4th side of above-mentioned 8th perforation, carry out fluid with the both sides of above-mentioned a pair working oil path to be connected, the bypass valve inserted by the above-mentioned end from above-mentioned 8th perforation between above-mentioned a pair working oil path carries out fluid connection or partition selectively.
In addition, the present invention, in order to realize above-mentioned second object, provides a kind of duplex pump unit, and described duplex pump unit possesses: port block; Respectively with the first and second oil hydraulic pump of the thickness direction one side side of above-mentioned port block and the end face sliding contact of the opposing party side; The first pump casing linked with above-mentioned port block, to form the first pump space of above-mentioned first oil hydraulic pump of collecting; And the second pump casing to link with above-mentioned port block, to form the second pump space of above-mentioned second oil hydraulic pump of collecting, wherein, above-mentioned port block is arranged: a pair first oil hydraulic pump working oil path, at least one end portion surface opening outside under the state be connected with above-mentioned first hydraulic pump fluid, and form a pair supply and discharge port; For the supplementary oil circuit of the first oil hydraulic pump that the pressure oil from pressure oil supply source is supplied to above-mentioned a pair first oil hydraulic pump working oil path through safety check; A pair second oil hydraulic pump working oil path, at least one end portion surface opening outside under the state be connected with above-mentioned second hydraulic pump fluid, and form a pair supply and discharge port; For the supplementary oil circuit of the second oil hydraulic pump that the pressure oil from above-mentioned pressure oil supply source is supplied to above-mentioned a pair second oil hydraulic pump working oil path through safety check; Set the single relief valve of the above-mentioned first and second oil hydraulic pump with the oil pressure of supplementary oil circuit; By the first overflow discharge oil circuit that the oil overflow from above-mentioned relief valve guides to above-mentioned first pump space; With the second overflow discharge oil circuit that above-mentioned oil overflow is guided to above-mentioned second pump space, arrange the first externally open pump side discharge port of above-mentioned first pump space at least one party of above-mentioned port block and above-mentioned first pump casing, arrange the second externally open pump side discharge port of above-mentioned second pump space at least one party of above-mentioned port block and above-mentioned second pump casing.
According to duplex pump unit of the present invention, because arrange the single relief valve set with the oil pressure of the both sides supplementing oil circuit with supplementary oil circuit and the second oil hydraulic pump the first oil hydraulic pump in the axial direction in the port block between the first and second oil hydraulic pump, oil overflow from above-mentioned relief valve is guided to the first and second pump space of accommodating the above-mentioned first and second oil hydraulic pump respectively, and arrange respectively by the first and second pump side discharge port that the above-mentioned first and second pump space is externally open, so, the reduction of the shared number of spare parts brought of above-mentioned relief valve can be sought, additional parts need not be equipped, just can be risen by the oil temperature of the above-mentioned oil in reserve of effective cyclic inhibition of the oil in reserve in the above-mentioned first and second pump space.
In a mode, above-mentioned port block is made and is comprised: first end buccal mass, its have for above-mentioned first oil hydraulic pump sliding contact thickness direction first end face and with second end face of above-mentioned first end face in thickness direction opposite side; With the second port block, its have for above-mentioned second oil hydraulic pump sliding contact thickness direction first end face and with second end face of above-mentioned first end face in thickness direction opposite side, above-mentioned second end face of the above-mentioned first and second port block is linked each other under the state abutted.
In addition, the invention provides a kind of working truck, described working truck possesses: above-mentioned duplex pump unit, become the motor of the power source of above-mentioned duplex pump unit, pairing left and right driving wheel, first oil hydraulic motor unit, it has and cooperates with above-mentioned first oil hydraulic pump and form first oil hydraulic motor of a HST, is exported by the rotating power of above-mentioned first oil hydraulic motor to the side in above-mentioned pair of driving wheels, second oil hydraulic motor unit, it has and cooperates with above-mentioned second oil hydraulic pump and form second oil hydraulic motor of the 2nd HST, is exported by the rotating power of above-mentioned second oil hydraulic motor to the opposing party in above-mentioned pair of driving wheels, make-up pump, it is driven by above-mentioned engine operation, plays a role as to the above-mentioned first and second oil hydraulic pump pressure oil supply source supplementing oil circuit, with the fuel tank that the oil sources as above-mentioned make-up pump plays a role, wherein, arrange a pair externally open for the first motor space of above-mentioned first oil hydraulic motor of collecting first motor-side discharge port at above-mentioned first oil hydraulic motor unit, arrange a pair externally open for the second motor space of above-mentioned second oil hydraulic motor of collecting second motor-side discharge port at above-mentioned second oil hydraulic motor unit, above-mentioned first pump side discharge port is connected with the side's fluid in above-mentioned a pair first motor-side discharge port, and the opposing party in above-mentioned a pair first motor-side discharge port is connected with above-mentioned fuel tank fluid, above-mentioned second pump side discharge port is connected with the side's fluid in above-mentioned a pair second motor-side discharge port, and the opposing party in above-mentioned a pair second motor-side discharge port is connected with above-mentioned fuel tank fluid.
According to working truck of the present invention, because the above-mentioned first pump side discharge port in above-mentioned duplex pump unit is connected with the side's fluid in a pair first motor-side discharge port in the first oil hydraulic motor unit, and the opposing party in above-mentioned a pair first motor-side discharge port is connected with fuel tank fluid, have again, above-mentioned second pump side discharge port in above-mentioned duplex pump unit is connected with the side's fluid in above-mentioned a pair second motor-side discharge port, and the opposing party in above-mentioned a pair second motor-side discharge port is connected with above-mentioned fuel tank fluid, so, additional parts need not be equipped, oil in reserve just can be made in the first and second pump space, circulate between first and second motor space and fuel tank positively, can effectively prevent the temperature of the first and second oil hydraulic pump and the first and second oil hydraulic motor from rising.
Accompanying drawing explanation
Fig. 1 is the sectional view of the pump unit of the first mode of execution of the present invention.
Fig. 2 A is the hydraulic circuit diagram of said pump unit.
Fig. 2 B is the hydraulic circuit diagram of the motor unit be connected with said pump unit fluid.
Fig. 3 is the sectional view along the III-III line in Fig. 1.
Fig. 4 is the sectional view along the IV-IV line in Fig. 1.
Fig. 5 is the sectional view along the V-V line in Fig. 1.
Fig. 6 is the end elevation along the VI-VI line in Fig. 5.
Fig. 7 is the end elevation along the VII-VII line in Fig. 1.
Fig. 8 is the end elevation along the VIII-VIII line in Fig. 1.
Fig. 9 is the end elevation along the IX-IX line in Fig. 1.
Figure 10 is the sectional view along the X-X line in Fig. 5.
Figure 11 is the sectional view near the first oil hydraulic motor unit in above-mentioned working truck.
Figure 12 is the sectional view of the above-mentioned first oil hydraulic motor unit shown in Figure 11.
Figure 13 is the sectional view of the variation of the above-mentioned first oil hydraulic motor unit shown in Figure 12.
Figure 14 is the sectional view of the duplex pump unit of the second mode of execution of the present invention.
Figure 15 is the hydraulic circuit diagram of the working truck applying above-mentioned duplex pump unit.
Figure 16 is the sectional view along the XVI-XVI line in Figure 14.
Figure 17 is the sectional view along the XVII-XVII line in Figure 14.
Figure 18 is the sectional view along the XVIII-XVIII line in Figure 14.
Figure 19 is the end elevation along the XIX-XIX line in Figure 18.
Figure 20 is the end elevation along the XX-XX line in Figure 14.
Figure 21 is the end elevation along the XXI-XXI line in Figure 14.
Figure 22 is the end elevation along the XXII-XXII line in Figure 14.
Figure 23 is the sectional view along the XXIII-XXIII line in Figure 18.
Figure 24 is the sectional view near the first oil hydraulic motor unit in above-mentioned working truck.
Figure 25 is the sectional view of the above-mentioned first oil hydraulic motor unit shown in Figure 24.
Figure 26 is the sectional view of the variation of the above-mentioned first oil hydraulic motor unit shown in Figure 25.
Embodiment
Mode of execution 1
Below, with reference to accompanying drawing, to being preferred embodiment described of pump unit of the present invention.
Fig. 1 is the sectional view of the pump unit 1 representing present embodiment.
As shown in Figure 1, said pump unit 1 has: the first oil hydraulic pump 15 (1); First end buccal mass 10 (1), its have for above-mentioned first oil hydraulic pump 15 (1) sliding contact directly or indirectly the first end face 11a and with the second end face 11b of above-mentioned first end face 11a in thickness direction opposite side; First pump casing 16 (1), the first end face 11a of itself and above-mentioned first end buccal mass 10 (1) links, to form first pump space P (1) of accommodating above-mentioned first oil hydraulic pump 15 (1); Second oil hydraulic pump 15 (2); Second port block 10 (2), its have for above-mentioned second oil hydraulic pump 15 (2) sliding contact directly or indirectly the first end face 11a and with the second end face 11b of above-mentioned first end face 11a in thickness direction opposite side; Second pump casing 16 (2), the first end face 11a of itself and above-mentioned second port block 10 (2) links, to form second pump space P (2) of accommodating above-mentioned second oil hydraulic pump 15 (2).
Said pump unit 1 is such as applied to working truck as the parts forming driving system speed change gear 500.
In the present embodiment, above-mentioned driving system speed change gear is made into 2 pumps, 2 motor manner.
Fig. 2 A represents the hydraulic circuit diagram of said pump unit 1.Fig. 2 B represents and to be connected with said pump unit 1 fluid and to form the hydraulic circuit diagram of first, second motor unit 511 (1), 511 (2) of above-mentioned driving system speed change gear 500.
In detail, as shown in Figure 2A and 2B, in above-mentioned driving system speed change gear 500, above-mentioned first oil hydraulic pump 15 (1) and driving pairing left and right first and second driving wheel 500 (1) of said pump unit 1, first oil hydraulic motor 511 (1) of first driving wheel 500 (1) of the side in 500 (2) cooperates, form a HST, above-mentioned second oil hydraulic pump 15 (2) and driving above-mentioned a pair first and the second driving wheel 500 (1), second oil hydraulic motor 511 (2) of second driving wheel 500 (2) of the opposing party in 500 (2) cooperates, form the 2nd HST.
In detail, as shown in Figure 2A and 2B, above-mentioned working truck, on the basis of said pump unit 1, also possesses: the motor 505 becoming the power source of said pump unit 1; Above-mentioned a pair first and the second driving wheel 500 (1), 500 (2); First oil hydraulic motor unit 510 (1), it is connected with above-mentioned first oil hydraulic pump 15 (1) fluid through a pair first hydraulic lines 410 (1), and there is above-mentioned first oil hydraulic motor 511 (1) forming an above-mentioned HST, and the rotating power of above-mentioned first oil hydraulic motor 511 (1) is exported to above-mentioned first driving wheel 500 (1); Second oil hydraulic motor unit 510 (2), it is connected with above-mentioned second oil hydraulic pump 15 (2) fluid through a pair second hydraulic lines 410 (2), and there is above-mentioned second oil hydraulic motor 511 (2) forming above-mentioned 2nd HST, and the rotating power of above-mentioned second oil hydraulic motor 511 (2) is exported to above-mentioned second driving wheel 500 (2); Make-up pump 530, it is operatively driven by above-mentioned motor 505, as above-mentioned first and the 2nd the working oil supply source of HST play a role; With the fuel tank 540 that the oil sources as above-mentioned make-up pump 530 plays a role.
As shown in Figure 2 A, in the upper formation a pair first oil hydraulic pump working oil path 411 (1) of above-mentioned first end buccal mass 10 (1), these a pair first oil hydraulic pump working oil path 411 (1) form a part for above-mentioned a pair first hydraulic lines 410 (1), in the upper formation a pair second oil hydraulic pump working oil path 411 (2) of above-mentioned second port block 10 (2), these a pair second oil hydraulic pump working oil path 411 (2) form a part for above-mentioned a pair second hydraulic lines 410 (2).
As shown in Figure 1, slide contact zone 11a ' the sliding contact of above-mentioned first oil hydraulic pump 15 (1) and the above-mentioned first end face 11a in above-mentioned first end buccal mass 10 (1), the slide contact zone 11a ' sliding contact of above-mentioned second oil hydraulic pump 15 (2) and the above-mentioned first end face 11a in above-mentioned second port block 10 (2).
The a pair kidney shape port (キ De ニ ー Port ー ト) (not shown) communicated with the suction/discharge portion of the above-mentioned first and second corresponding oil hydraulic pump 15 (1), 15 (2) is set at above-mentioned slide contact zone 11a ', between the above-mentioned oil hydraulic pump 15 (1), 15 (2) of correspondence and the above-mentioned oil hydraulic pump working oil path 411 (1), 411 (2) of correspondence, discharges working oil through above-mentioned a pair kidney shape port supply.
In addition, in the present embodiment, as shown in Figure 1, the end face with above-mentioned suction/discharge portion of above-mentioned oil hydraulic pump 15 (1), 15 (2) is made into concavity sphere, and the outer surface of above-mentioned slide contact zone 11a ' is made into the convex sphere engaged with above-mentioned concavity sphere.
Fig. 3 is the sectional view of the above-mentioned first end buccal mass 10 (1) represented along the III-III line in Fig. 1.
As shown in Figure 3, above-mentioned first end buccal mass 10 (1) is on the basis of above-mentioned a pair first oil hydraulic pump working oil path 411 (1), also having first axle hole 14 (1) through between above-mentioned first and second end face 11a, 11b, inserting for driving the first pump shaft 17 (1) of corresponding above-mentioned first oil hydraulic pump 15 (1); By the first supplementary oil circuit 430 (1) that the pressure oil from pressure oil-source supplies to above-mentioned a pair first oil hydraulic pump working oil path 411 (1).
Above-mentioned a pair first oil hydraulic pumps working oil path 411 (1) at least one end portion surface opening outside under the state be connected with above-mentioned first oil hydraulic pump 15 (1) fluid, forms a pair first supply and discharge port 411P (1).
In the present embodiment, as shown in Figure 3, above-mentioned a pair first pump working oil path 411 (1) have: pair of parallel portion 415, mutually relative across above-mentioned first axle hole 14 (1), extend with the first plate face direction X1 of the state of symmetry at above-mentioned first end buccal mass 10 (1), and at above-mentioned first end face 11a opening, to connect with corresponding above-mentioned first oil hydraulic pump 15 (1) fluid; A pair main opening portion 416, extends from above-mentioned pair of parallel portion 415 to above-mentioned first direction X1 mono-side side, plate face, and surface opening and form above-mentioned a pair first supply and discharge port 411P (1) outside.
In the present embodiment, as shown in Figure 3, above-mentioned first end buccal mass 10 (1) has the first ~ four side 12a ~ 12d extended at thickness direction, with by connected to each other for the periphery of above-mentioned first and second end face 11a, 11b.
Above-mentioned first and second side 12a, 12b is respectively towards above-mentioned first X1 mono-side side, direction, face, plate face and the opposing party side, and the above-mentioned 3rd and the 4th side 12c, 12d is respectively towards second plate face direction X2 mono-side side and the opposing party side orthogonal with above-mentioned first plate face direction X1.
And above-mentioned first supply and discharge port 411P (1) is at above-mentioned first 12a place, side opening.
In addition, in the present embodiment, above-mentioned a pair first oil hydraulic pump working oil path 411 (1) have and to extend and at a pair secondary opening portion 417 of above-mentioned second side 12b opening, above-mentioned a pair secondary opening portion 417 is blocked by embolism 417a from above-mentioned pair of parallel portion 415 to above-mentioned first direction, plate face X1 opposite side.
In the present embodiment, above-mentioned a pair first oil hydraulic pump working oil path 411 (1) are formed by a pair first perforation 400a, and these a pair first perforation 400a are perforated into through for above-mentioned first end buccal mass 10 (1) under the state along above-mentioned first plate face direction X1.
Above-mentioned first supplements oil circuit 430 (1) as shown in Figure 3, one end surface opening outside, mineralization pressure oil receiving port 430P, and the other end branch, be connected with above-mentioned a pair first oil hydraulic pumps working oil path 411 (1) fluid through pair of check valves 435.
In addition, in the present embodiment, each of above-mentioned pair of check valves 435 all makes the form of the function in the lump with high-pressure overflow valve.
In the present embodiment, above-mentioned first supplement oil circuit 430 (1) by second and the 3rd perforation 400b, 400c formed.
In detail, as shown in Figure 3, above-mentioned second perforation 400b compared with above-mentioned first axle hole 14 (1) close to the side of above-mentioned second side 12b, the mode be communicated with between above-mentioned a pair first perforation 400a to be extended along above-mentioned second plate face direction X2, an end and the other end are respectively at the above-mentioned 3rd and the 4th 12c, 12d place, side opening.
One end of above-mentioned 3rd perforation 400c is at above-mentioned second side 12b opening, and bore a hole in the other end and above-mentioned second, 400b fluid is connected.
In the present embodiment, above-mentioned second and the 3rd perforation 400b, 400c formed T-shaped.
Namely, above-mentioned 3rd perforation 400c extend along above-mentioned first plate face direction X1 between above-mentioned a pair oil hydraulic pump working oil path 411 (1), an end is at above-mentioned second side 12b opening, and bore a hole in the other end and above-mentioned second, 400b fluid is connected.
In more detail, above-mentioned 3rd perforation 400c, under the state of the axis through above-mentioned first axle hole 14 (1), is positioned at along on the imaginary plane IP of the thickness direction of above-mentioned first plate face direction X1 and above-mentioned first end buccal mass 10 (1).
Above-mentioned pair of check valves 435 is inserted into from an above-mentioned end of above-mentioned second perforation 400b and the other end respectively, is configured to authorized pressure oil and flows into from above-mentioned 3rd perforation 400c to above-mentioned a pair first oil hydraulic pump working oil path 411 (1) and prevent reverse flowing.
Have again, as shown in Figure 3, at above-mentioned first end buccal mass 10 (1) upper formation first branch oil circuit 440 (1), one end supplements oil circuit 430 (1) fluid at compared with above-mentioned pair of check valves 435 depended on pressure oil flow direction upstream side and above-mentioned first and is connected, and the other end forms connecting port 440P at above-mentioned second end face 11b opening.
Above-mentioned connecting port 440P as shown in Figure 1 and Figure 3, under the state of the axis through above-mentioned first axle hole 14 (1), be positioned at along on the imaginary plane IP of the thickness direction of above-mentioned first plate face direction X1 and above-mentioned first end buccal mass 10 (1).
In the present embodiment, above-mentioned first branch's oil circuit 440 (1) is formed by the 4th perforation 400d.
As shown in Figure 3, an end and the above-mentioned 3rd 400c fluid of boring a hole is connected above-mentioned 4th perforation 400d, and the other end is at above-mentioned second end face 11b opening.
Fig. 4 is the sectional view of above-mentioned second port block 10 (2) represented along the IV-IV line in Fig. 1.
As shown in Fig. 1 and Fig. 4, above-mentioned second port block 10 (2) is on the basis of above-mentioned a pair second oil hydraulic pump working oil path 411 (2), also having: by the second axis hole 14 (2) through between above-mentioned first and second end face 11a, 11b, inserting for driving the second pump shaft 17 (2) of corresponding above-mentioned second oil hydraulic pump 15 (2); By the second supplementary oil circuit 430 (2) that the pressure oil from pressure oil-source supplies to above-mentioned a pair second oil hydraulic pump working oil path 411 (2), namely folder has been inserted second of pair of check valves 435 and has been supplemented oil circuit 430 (2); Second branch's oil circuit 440 (2), one end supplements oil circuit 430 (2) fluid at compared with above-mentioned pair of check valves 435 depended on pressure oil flow direction upstream side and above-mentioned second and is connected, and the other end forms connecting port 440P at above-mentioned second end face 11b opening.
Above-mentioned second port block 10 (2) has the outer shape identical with above-mentioned first end buccal mass 10 (1).
In addition, above-mentioned a pair second oil hydraulic pump working oil path 411 (2) have the structure identical with above-mentioned a pair first oil hydraulic pump working oil path 411 (1), above-mentioned second axis hole 14 (2) has the structure identical with above-mentioned first axle hole 14 (1), above-mentioned second supplements oil circuit 430 (2) has the identical structure of oil circuit 430 (1) supplementary with above-mentioned first, and above-mentioned second branch's oil circuit 440 (2) has the structure identical with above-mentioned first branch's oil circuit 440 (1).
Therefore, in figure, for the second port block 10 (2), to marking identical symbol with the identical part in above-mentioned first end buccal mass 10 (1) or the same-sign of " 2 " being changed in parantheses.
As previously mentioned, above-mentioned second branch's oil circuit 440 (2) has the structure identical with above-mentioned first branch's oil circuit 440 (1).
Namely, the connecting port 440P of above-mentioned second branch's oil circuit 440 (2) is also same with the connecting port 440P of above-mentioned first branch's oil circuit 440 (1), under the state through corresponding axis hole 14 (2) axis, be positioned at along on the imaginary plane IP of the thickness direction of above-mentioned first direction, plate face and above-mentioned port block.
According to this structure, simultaneously the above-mentioned first and second port block 10 (1) is made at the first assembly realizing above-mentioned first oil hydraulic pump 15 (1) and above-mentioned first pump casing 16 (1) to be supported on the first end face 11a of above-mentioned first end buccal mass 10 (1) and the second assembly of above-mentioned second oil hydraulic pump 15 (2) and above-mentioned second pump casing 16 (2) being supported on the first end face 11a of above-mentioned second port block 10 (2), first direction, plate face of 10 (2) is consistent, under the state that one side makes the second end face 11b against each other, such as linked by 4 construction bolts, mutual above-mentioned pump shaft 17 (1), 17 (2) are positioned at the above-mentioned first and second oil hydraulic pump 15 (1) coaxially, when the duplex of 15 (2) configures, above-mentioned first and second port block 10 (1), the above-mentioned connecting port 440P fluid connection each other of 10 (2).
Therefore, in the duplex configuration of the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2), supply to the above-mentioned pressure oil receiving port 430P in the above-mentioned first and second port block 10 (1), 10 (2) any one party by means of only by the pressure oil from single pressure oil-source, the both sides that just can supplement oil circuit 430 (1) and the above-mentioned second supplementary oil circuit 430 (2) to above-mentioned first supply pressure oil.
Specifically, by embolism 431 (see Fig. 3) by the supplementary oil circuit 430 (1) of the above-mentioned first and second oil hydraulic pump, the above-mentioned pressure oil receiving port 430P of the supplementary oil circuit (being that above-mentioned first oil hydraulic pump is with supplementing oil circuit 430 (1) in the present embodiment) of any one party of 430 (2) blocks, and the above-mentioned pressure oil receiving port 430P of the supplementary oil circuit of the opposing party (in the present embodiment for above-mentioned second oil hydraulic pump is with supplementing oil circuit 430 (2)) is connected with above-mentioned make-up pump 530 fluid, accordingly, can by the pressure oil from single above-mentioned make-up pump 530 to the supplementary oil circuit 430 (1) of both sides, 430 (2) supplies.
In addition, in the said pump unit 1 of present embodiment, also can make the above-mentioned first and second assembly separate configurations.
Namely, also each of the above-mentioned first and second assembly can be used as by single pump unit of separate configurations.
In the present embodiment, as shown in Figure 3 and 4, in each of the above-mentioned first and second port block 10 (1), 10 (2), the corner when seeing along thickness of slab direction is provided with installation base 13.
When making the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) duplex configuration, installation base is opposite each other fastening through construction bolt each other.
When the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) is used as single pump unit, under the state that above-mentioned installation base 13 abuts with fixing parts such as not shown frameworks, be fixed on fixation portions by the construction bolt be suitable for.
In addition, in independent type of service, by the above-mentioned connecting port 440P of the above-mentioned first and second port block 10 (1), 10 (2) is connected through pipe arrangement fluid each other, the pressure oil from single above-mentioned make-up pump 530 can be supplied to the supplementary oil circuit 430 (1), 430 (2) of both sides.
Have again, as shown in Fig. 2 A ~ Fig. 4, the said pump unit 1 of present embodiment is configured to set by single relief valve 450 oil pressure that above-mentioned first and second supplements the both sides of oil circuit 430 (1), 430 (2), accordingly, seek because number of components cuts down with low costization brought.
Namely, in said pump unit 1, a side (being above-mentioned first end buccal mass 10 (1) in illustrated mode) only in the above-mentioned first and second port block 10 (1), 10 (2) assembles above-mentioned relief valve 450, sets by above-mentioned relief valve 450 oil pressure that above-mentioned first and second supplements the both sides of oil circuit 430 (1), 430 (2).
Specifically, the port block (being above-mentioned first end buccal mass 10 (1) in illustrated mode) of at least assembling the side of above-mentioned relief valve 450 in the above-mentioned first and second port block 10 (1), 10 (2), on the basis of above-mentioned first ~ four perforation 400a ~ 400d, the 5th perforation 400e that the providing holes be also formed as above-mentioned relief valve 450 plays a role.
As shown in Figure 3, above-mentioned 5th perforation 400e with an end above-mentioned 3rd side 12c or the 4th side 12d opening and bore a hole in the other end and the above-mentioned 3rd mode that 400c fluid is connected, extending along above-mentioned second plate face direction X2 close to the side of above-mentioned second side 12c compared with above-mentioned first axle hole 14 (1), above-mentioned relief valve 450 is inserted into above-mentioned 5th perforation 400e with first side towards the mode of above-mentioned 3rd perforation 400c from open end.
In addition, in the present embodiment, in order to seek the above-mentioned first and second port block 10 (1), the saving of the common as much as possible manufacture cost brought of 10 (2), also above-mentioned 5th perforation 400e is formed as shown in FIG. 4 and 5 in the port block (being above-mentioned second port block 10 (2) in the present embodiment) of the side of unassembled above-mentioned relief valve 450, one end of the 5th perforation 400e is connected with corresponding above-mentioned supplementary oil circuit 430 (2) fluid at depended on pressure oil flow direction upstream side compared with above-mentioned safety check 435, and the other end is surface opening outside.
In addition, in above-mentioned second port block 10 (2) of the side of unassembled above-mentioned relief valve 450, the opening end of above-mentioned 5th perforation 400e is blocked by embolism 458.
The said pump unit 1 of present embodiment is configured to the oil overflow from above-mentioned relief valve 450 to guide to pump space P (1) of being marked by the port block (being above-mentioned first end buccal mass 10 (1) in illustrated mode) and pump casing 16 (1) corresponding with it that are assembled with above-mentioned relief valve 450, and is also guided in pump space P (2) that above-mentioned oil overflow marks to port block (being above-mentioned second port block 10 (2) in illustrated mode) and the pump casing 16 (2) corresponding with it by unassembled above-mentioned relief valve 450.
Fig. 5 represents the sectional view along the V-V line in Fig. 1.
Namely, said pump unit 1 is as shown in Fig. 3 ~ Fig. 5, comprise the first overflow discharge oil circuit 460 (1) guided to above-mentioned first pump space P (1) formed by the above-mentioned first end buccal mass 10 (1) and said pump shell 16 (1) corresponding with it that are assembled with above-mentioned relief valve 450 by the oil overflow from above-mentioned relief valve 450, by the second overflow discharge oil circuit 460 (2) that above-mentioned oil overflow guides to above-mentioned second pump space P (2) that above-mentioned second port block 10 (2) and the second corresponding with it pump casing 16 (2) by unassembled above-mentioned relief valve 450 is formed.
As shown in Fig. 3 and Fig. 5, above-mentioned first overflow discharge oil circuit 460 (1) is formed at above-mentioned first end buccal mass 10 (1), so that an end is connected with the secondary side fluid of above-mentioned relief valve 450, and the other end is at the first end face 11a opening, and be connected with above-mentioned first pump space P (1) fluid.
In addition, the region of the other end beyond the above-mentioned slide contact zone 11a ' of correspondence of above-mentioned first overflow discharge oil circuit 460 (1), at above-mentioned first end face 11a opening.
Fig. 6 is the end elevation of above-mentioned second pump casing 16 (2) represented along the VI-VI line in Fig. 5.
On the other hand, above-mentioned second overflow discharge oil circuit 460 (2) is as shown in Fig. 4 ~ Fig. 6, comprise and to be connected with the secondary side fluid of above-mentioned relief valve 450 with an end and the other end is formed at the upstream side part 461 on above-mentioned first end buccal mass 10 (1) in the mode of the second end face 11b opening, with an end at the second end face 11b opening to be connected with above-mentioned upstream side part 461 fluid, and the other end is at the first end face 11a opening, and the mode be connected with above-mentioned second pump space P (2) fluid is formed at the downstream side part 462 in above-mentioned second port block 10 (2).
In addition, the region of the other end beyond the above-mentioned slide contact zone 11a ' of correspondence of above-mentioned downstream side part 462, at above-mentioned first end face 11a opening.
Above-mentioned first overflow discharge oil circuit 460 (1) and above-mentioned second overflow discharge oil circuit 460 (2) are formed by the 6th perforation 400f be arranged on above-mentioned first end buccal mass 10 (1) and the 7th perforation 400g be arranged in above-mentioned second port block 10 (2).
In detail, above-mentioned 6th perforation 400f is as shown in Fig. 3 and Fig. 5, with under the state that the 400e that bores a hole the above-mentioned 5th is through, an end and the other end are formed in the mode of above-mentioned first and second end face 11a, 11b opening respectively and are assembled with on the above-mentioned first end buccal mass 10 (1) of above-mentioned relief valve 450.
On the other hand, above-mentioned 7th perforation 400g is formed on above-mentioned second port block 10 (2) of unassembled above-mentioned relief valve 450 as shown in Fig. 4 ~ Fig. 6, so that the end that the other end fluid should boring a hole 400f with the above-mentioned 6th is connected is at above-mentioned second end face 11b opening, and the other end to be connected with above-mentioned second pump space P (2) fluid at above-mentioned first end face 11a opening.
In the structure shown here, the part of close first end face 11a compared with the 400e that bore a hole with the above-mentioned 5th that is positioned in above-mentioned 6th perforation 400f forms above-mentioned first overflow discharge oil circuit 460 (1).
In addition, the part be positioned near the second end face 11b compared with the 400e that bore a hole with the above-mentioned 5th in above-mentioned 6th perforation 400f forms above-mentioned upstream side part 461, and the above-mentioned 7th 400g that bores a hole forms above-mentioned downstream side part 462.
Have again, in said pump unit 1, as shown in Figure 1, the at least one party of above-mentioned first end buccal mass 10 (1) and above-mentioned first pump casing 16 (1), form the first pump side discharge port 470 (1) externally opened in above-mentioned first pump space P (1) formed by both, the at least one party of above-mentioned second port block 10 (2) and above-mentioned second pump casing 16 (2), formed the second externally open for above-mentioned second pump space P (2) that formed by both pump side discharge port 470 (2).
In the present embodiment, as shown in Figure 1, above-mentioned first pump side discharge port 470 (1) is formed at above-mentioned first pump casing 16 (1), and above-mentioned second pump side discharge port 470 (2) is formed at above-mentioned second pump casing 16 (2).
Like this, in the said pump unit 1 of present embodiment, although be configured to only in the above-mentioned first and second port block 10 (1), a side in 10 (2) assembles above-mentioned relief valve 450, but can by the oil overflow from above-mentioned relief valve 450 to the above-mentioned first and second pump space P (1), the both sides of P (2) guide, and by the above-mentioned first and second pump space P (1), the oil in reserve of P (2) is through the above-mentioned first and second pump side discharge port 470 (1), 470 (2) externally discharge, accordingly, additional part need not be equipped with, just can make the above-mentioned first and second pump space P (1), oil in reserve in P (2) circulates effectively, accordingly, the temperature of above-mentioned oil in reserve can be effectively suppressed to rise.
The first and second through hole 475 (1), 475 (2) making the above-mentioned first and second pump space P (1), the connection of P (2) fluid is preferably formed in the above-mentioned first and second port block 10 (1), 10 (2).
Above-mentioned first through hole 475 (1) is formed on above-mentioned first end buccal mass 10 (1), so that an end is at above-mentioned first end face 11a opening and be connected with above-mentioned first pump space P (1) fluid, and the other end is at above-mentioned second end face 11b opening.
Above-mentioned second through hole 475 (2) is formed on above-mentioned second port block 10 (2), so that an end is at above-mentioned first end face 11a opening and be connected with above-mentioned second pump space P (2) fluid, and the other end is connected with above-mentioned first through hole 475 (1) fluid at above-mentioned second end face 11b opening.
In the present embodiment, as shown in Figure 3 and 4, each of the above-mentioned first and second port block 10 (1), 10 (2) possesses the bypass valve 480 being communicated with selectively or cutting off between above-mentioned a pair working oil path 411 (1), 411 (2) by correspondence.
In detail, as shown in Figure 3 and 4, the above-mentioned first and second port block 10 (1), 10 (2) each on be formed the 8th boring a hole 400h of extending along above-mentioned second plate face direction X2 close to the side of above-mentioned first side 12a compared with the above-mentioned first and second corresponding axis hole 14 (1), 14 (2).
Above-mentioned 8th perforation 400h at one end under the state of side's opening of the above-mentioned 3rd or the 4th side 12c, 12d, is communicated with between above-mentioned a pair working oil path 411 (1), 411 (2) of correspondence in portion.
And, above-mentioned bypass valve 480 from above-mentioned 8th perforation 400h an above-mentioned end be inserted into, according to peripheral operation, will between above-mentioned a pair working oil path 411 (1), 411 (2) selectively fluid connect or partition.
Like this, by above-mentioned bypass valve 480 being configured at side contrary with above-mentioned safety check 435 and above-mentioned relief valve 480 across above-mentioned axis hole 14 (1), 14 (2) on the second plate face direction X2, above-mentioned bypass valve 480 reasonably can be configured.
In the said pump unit 1 of present embodiment, as shown in Figure 1, above-mentioned first pump shaft 17 (1) at one end portion from the state that above-mentioned first pump space P (1) extends outward, rotate about the axis and be freely supported on above-mentioned first pump casing 16 (1) and above-mentioned first end buccal mass 10 (1), the above-mentioned end to above-mentioned first pump shaft 17 (1) inputs the rotating power from above-mentioned motor 505.
Above-mentioned second pump shaft 17 (2), with in state that is coaxial above with above-mentioned first pump shaft 17 (1), that can not link with above-mentioned first pump shaft 17 (1) with the relative rotation, rotates about the axis and is freely supported in above-mentioned second pump casing 16 (2) and above-mentioned second port block 10 (2).
As shown in Figure 1, in the present embodiment, above-mentioned make-up pump 530 is driven by the rotating power from above-mentioned second pump shaft 17 (2).
Namely, an end can not be linked to the other end of above-mentioned first pump shaft 17 (1) by above-mentioned second pump shaft 17 (2) with the relative rotation, and from the other end to above-mentioned make-up pump 530 outputting rotary power.
Above-mentioned make-up pump 530 can be adopted in various manners, but, in the present embodiment, make gear pump.
Fig. 7 represents the end elevation along the VII-VII line in Fig. 1.
In detail, as shown in Fig. 1 and Fig. 7, above-mentioned make-up pump 530 comprises: the make-up pump shell 531 linked with said pump unit 1; Live axle 535, it is supported on above-mentioned make-up pump shell 531, and can not link with above-mentioned second pump shaft 17 (2) with the relative rotation around axis; The driven shaft 536 of above-mentioned make-up pump shell 531 is supported on the state parallel with above-mentioned live axle 535; Actuation gear 537, its with can not be supported on the relative rotation above-mentioned live axle 535 state, be housed in above-mentioned make-up pump shell 531; Driven gear 538, it, under the state being supported on above-mentioned driven shaft 536 in the mode engaged with above-mentioned actuation gear 537, is housed in above-mentioned make-up pump shell 531.
As shown in Figure 7, port 532b and discharge port 532c is sinked at all wall openings of above-mentioned make-up pump shell 531, as shown in Figure 2 A, the above-mentioned port 532b that sinks is connected with above-mentioned fuel tank 540 through pipe arrangement, and above-mentioned discharge port 530c is connected with above-mentioned pressure oil receiving port 430P through pipe arrangement.In addition, on the pipe arrangement connected by above-mentioned discharge port 530c and above-mentioned pressure oil receiving port 430P, folder is fitted with pipe line filter and machine oil cooler (see Fig. 2 A).
As shown in Fig. 1 and Fig. 7, above-mentioned make-up pump shell 531 comprises the housing main body 532 linked with corresponding above-mentioned second pump casing 16 (2) and the cover 533 linked with above-mentioned housing main body 532.
As shown in Figure 7, above-mentioned housing main body 532 is linked to the end face of above-mentioned second pump casing 16 (2) dismantledly through secure component 532a such as bolts, and above-mentioned cover 533 is linked to above-mentioned housing main body 532 dismantledly through secure component 533a such as bolts.
The said pump unit 1 of present embodiment as shown in Figure 1, is supported on the fixed components such as vehicle frame 503 through above-mentioned first pump casing 16 (1).
Fig. 8 and Fig. 9 is the end elevation represented respectively along the VIII-VIII line in Fig. 1 and IX-IX line.
In detail, as shown in Fig. 1 and Fig. 8, the end face of above-mentioned first pump casing 16 (1) links base member 18 through secure component 19a such as bolts, said pump unit 1 with above-mentioned base member 18 by be placed in fixation portions part 503 state under be fixed on fixation portions part 503 through the secure components such as bolt 504.
In addition, as previously mentioned, in the said pump unit 1 of present embodiment, common in order to seek part, the above-mentioned first and second pump casing 16 (1), 16 (2) is made into identical structure.
Therefore, as shown in FIG. 8 and 9, the fastener hole 532b of above-mentioned make-up pump the shell 531 and fastener hole 19b of above-mentioned base member 18 is formed with at the end face of each of the above-mentioned first and second pump casing 16 (1), 16 (2).
In the said pump unit 1 of present embodiment, the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) relatively has identical structure mutually, and makes the variable volume that can change volume respectively.
In detail, as shown in Fig. 1 and Fig. 2 A, said pump unit 1 also possesses a pair volume regulating mechanism 30 of the volume changing the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) respectively.
Figure 10 represents the sectional view along the X-X line in Fig. 5.
As shown in Figure 1, above-mentioned volume regulating mechanism 30 has movable swash plate 31, and it is by deflecting around with corresponding above-mentioned pump shaft 17 (1), 17 (2) orthogonal swing reference axis (not shown) and change the volume of corresponding above-mentioned oil hydraulic pump 15 (1), 15 (2).
In the said pump unit 1 of present embodiment, above-mentioned movable swash plate 31 utilizes the effect of hydraulic pressure to deflect.
In detail, as shown in Fig. 2 A and Figure 10, said pump unit possesses a pair hydraulic servomechanism 35 making the above-mentioned movable swash plate 31 of the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) deflect respectively.
Above-mentioned hydraulic servomechanism 35 has as shown in Fig. 2 A and Figure 10: piston 352, and it is to be reciprocally housed in above-mentioned cylinder 351 by fluid tight for the inner space of cylinder 351 the mode rotating forward room 351a and reversion room 351b that is separated into; From the supply pipeline 356 of pressure oil supply source supply pressure oil; By the discharge pipe 357 that pressure oil guides to oil storage tank; The rotating forward pipeline 358 be connected with above-mentioned rotating forward room and above-mentioned reversion room fluid respectively and the pipeline 359 that reverses; Switching valve 353, it is connected to above-mentioned supply pipeline 356 and above-mentioned discharge pipe 357 at first side fluid, and is connected to above-mentioned rotating forward pipeline 358 and above-mentioned reversion pipeline 359 in secondary side fluid.
Above-mentioned switching valve 353 can through by the input arm 353a of peripheral operation, the holding position obtaining above-mentioned rotating forward pipeline 358 and above-mentioned reversion pipeline 359 to block selectively, above-mentioned supply pipeline 356 is connected with above-mentioned rotating forward pipeline 358 fluid and the forward position that above-mentioned discharge pipe 357 is connected with above-mentioned reversion pipeline 359 fluid, makes above-mentioned supply pipeline 356 be connected with above-mentioned reversion pipeline 359 fluid and make the backward position that above-mentioned discharge pipe 357 is connected with above-mentioned rotating forward pipeline 358 fluid.
In addition, the main variable-speed operation parts such as operating stem of possessing of the linkage mechanism of above-mentioned input arm 353a outside figure and above-mentioned working truck operatively links.
Above-mentioned piston 352 correspondingly moves to forward direction in the axial direction with the supply to the pressure oil of above-mentioned rotating forward room 351a, and correspondingly moves to reverse directions in the axial direction with the supply of the pressure oil to above-mentioned reversion room 351b.
Above-mentioned piston 352 works with above-mentioned movable swash plate 31 and links, correspondingly to make above-mentioned movable swash plate 31 deflect to forward direction around above-mentioned swing reference axis with the movement to the forward direction along axial direction, and above-mentioned movable swash plate 31 is correspondingly made to deflect to reverse directions around above-mentioned swing reference axis with the movement to the reverse directions along axial direction.
In the present embodiment, as shown in Figure 2 A, above-mentioned supply pipeline 356 connects with the segment fluid flow being positioned at depended on pressure oil flow direction upstream side compared with above-mentioned pair of check valves 435 in corresponding above-mentioned supplementary oil circuit 430 (1), 430 (2), receives the pressure oil set by above-mentioned relief valve 450.
According to this structure, with low costization brought relative to the simplification of the pressure oil supplying structure of above-mentioned hydraulic servomechanism 35 can be sought.
In detail, above-mentioned supply pipeline 356 as shown in Figure 5, comprise be formed in the above-mentioned first and second port block 10 (1), 10 (2) each on port block side supply oil circuit 356a and be formed in the above-mentioned first and second pump casing 16 (1), 16 (2) each on pump casing side supply oil circuit 356b.
Above-mentioned port block side supply oil circuit 356a is as shown in Fig. 1, Fig. 3, Fig. 4 and Fig. 5, one end connects with the segment fluid flow being positioned at depended on pressure oil flow direction upstream side compared with above-mentioned pair of check valves 435 in corresponding above-mentioned supplementary oil circuit 430 (1), 430 (2), and the other end is at above-mentioned first end face 11a opening.
Said pump shell side supply oil circuit 356b is as shown in Fig. 1, Fig. 5 and Fig. 6, one end is to supply mode that oil circuit 356a fluid is connected at the abutment portion opening with above-mentioned port block 10 (1), 10 (2) with above-mentioned port block side, and the other end is connected with the first side fluid of above-mentioned switching valve 353.
As shown in Figure 2A and 2B, above-mentioned working truck possesses above-mentioned first oil hydraulic motor unit 510 (1) and above-mentioned second oil hydraulic motor unit 510 (2), above-mentioned first oil hydraulic motor unit 510 (1) comprises and cooperates with above-mentioned first oil hydraulic pump 15 (1) and form above-mentioned first oil hydraulic motor 511 (1) of an above-mentioned HST, and above-mentioned second oil hydraulic motor unit 510 (2) comprises and cooperates with above-mentioned second oil hydraulic pump 15 (2) and form above-mentioned second oil hydraulic motor 511 (2) of above-mentioned 2nd HST.
In addition, above-mentioned second oil hydraulic motor unit 510 (2) has the structure identical with above-mentioned first oil hydraulic motor unit 510 (1).Therefore, in the drawings, for above-mentioned second oil hydraulic motor unit 510 (2), mark same-sign to the identical structure member in above-mentioned first oil hydraulic motor unit 510 (1) or the same-sign of " 2 " will be changed in parantheses.
Figure 11 represents the sectional view near above-mentioned first oil hydraulic motor unit 510 (1).
Further, Figure 12 is the sectional view representing above-mentioned first oil hydraulic motor unit 510 (1).
As shown in Fig. 2 B and Figure 12, above-mentioned first oil hydraulic motor unit 510 (1) is provided with by a pair externally open for the first motor space M (1) of above-mentioned first oil hydraulic motor 511 (1) of collecting first motor-side discharge port 570 (1).
Equally, above-mentioned second oil hydraulic motor unit 510 (2) is provided with a pair externally open for the second motor space M (2) of above-mentioned second oil hydraulic motor 511 (2) of collecting second motor-side discharge port 570 (2).
And, as shown in Figure 2A and 2B, a side in above-mentioned a pair first motor-side discharge port 570 (1) is connected with above-mentioned first pump side discharge port 470 (1) fluid, and the opposing party in above-mentioned a pair first motor-side discharge port 570 (1) is connected with above-mentioned fuel tank 540 fluid, a side in above-mentioned a pair second motor-side discharge port 570 (2) is connected with above-mentioned second pump side discharge port 470 (2) fluid, and the opposing party in above-mentioned a pair second motor-side discharge port 570 (2) is connected with above-mentioned fuel tank 540 fluid.
According to this structure, additional parts need not be equipped with, oil in reserve just can be made positively to circulate between the above-mentioned first and second pump space P (1), P (2), the above-mentioned first and second motor space M (1), M (2) and above-mentioned fuel tank 540, can effectively prevent the temperature of the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) and above-mentioned first and second oil hydraulic motor 511 (1), 511 (2) from rising.
Above-mentioned first and second oil hydraulic motor unit 510 (1), each of 510 (2) all has port block 513, with the above-mentioned oil hydraulic motor 511 (1) (511 (2)) of above-mentioned port block 513 sliding contact, to form the motor case 514 linked mode and the above-mentioned port block 513 in said motor space M (1) (M (2)) that above-mentioned oil hydraulic motor 511 (1) (511 (2)) is accommodated, the motor drive shaft 515 be freely supported on above-mentioned port block 513 and said motor shell 514 is rotated about the axis with the state that can not support above-mentioned oil hydraulic motor 511 (1) (521 (1)) with the relative rotation.
And, be formed with above-mentioned a pair motor-side discharge port 570 (1) (570 (2)) at said motor shell 514.
Above-mentioned port block 513 has the base configuration identical with the above-mentioned first end buccal mass 10 (1) shown in Fig. 3 and Fig. 4 and above-mentioned second port block 10 (2), eliminates above-mentioned safety check, above-mentioned relief valve, above-mentioned bypass valve and associated oil circuit.
In this case, the rotary component (cylinder body, piston) of above-mentioned oil hydraulic motor 511 (1) (511 (2)) uses the parts identical with the rotary component in the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2).Therefore, although be 2 pump/2 motor manner, use totally 4 hydraulic equipments, also can significantly reduce total cost.
In addition, in the present embodiment, the fixed volume type that each volume being made into corresponding above-mentioned oil hydraulic motor 511 (1) (511 (2)) of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) is fixed.
Namely, as shown in figs. 11 and 12, each of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) also has the fixing swash plate 516 above-mentioned oil hydraulic motor 511 (1) (511 (2)) of correspondence being fixed as specified volume.
Certainly, also can as shown in figure 13, each of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) possesses the movable swash plate 517 of alternative above-mentioned fixing swash plate 516.According to this structure, the moment of torsion driving the traveling of above-mentioned driving wheel to export can be improved.
Further, as shown in figure 13, each of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) possesses the hydraulic servomechanism 518 utilizing the effect of hydraulic pressure to be deflected by above-mentioned movable swash plate 517.
In this case, each of above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) is except said motor axle 515, the part with the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) identical structures can be used, component sharing rate can be improved further.
Identical with the pressure oil supplying structure in the first and second oil hydraulic pump 15 (1), 15 (2) relative to the pressure oil supplying structure of above-mentioned hydraulic servomechanism 518.
Namely, relative to the pressure oil supplying structure of above-mentioned hydraulic servomechanism 518 comprise motor case side supply oil circuit 519b and port block side supply oil circuit 519a, be configured to the pressure oil that received by the supply port 520 from the peripheral wall surfaces opening in above-mentioned port block 513 through above-mentioned oil circuit 519a, 519b to above-mentioned hydraulic servomechanism 518 fuel feeding.
In addition, above-mentioned supply port 520 connects the pipe arrangement of the discharge port 530c branch from above-mentioned make-up pump 531.
In addition, in this case, the above-mentioned movable swash plate 517 of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) is mutual relatively with synchronous state of operation by single secondary variable-speed operation parts.Namely, the above-mentioned movable swash plate 517 of above-mentioned first oil hydraulic motor unit 510 (1) and the above-mentioned movable swash plate 517 of above-mentioned second oil hydraulic motor unit 510 (2) carry out work link through linkage mechanism and above-mentioned single secondary variable-speed operation parts.
Above-mentioned movable swash plate 517 in above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) is relatively operated with synchronous state mutually by single secondary variable-speed operation parts.
Namely the input arm that the hydraulic servomechanism 518, be associated with the above-mentioned movable swash plate 517 of above-mentioned first oil hydraulic motor unit 510 (1) possesses and the input arm that the hydraulic servomechanism 518 be associated with the above-mentioned movable swash plate 517 of above-mentioned second oil hydraulic motor unit 510 (2) possesses carry out work link through linkage mechanism and above-mentioned single secondary variable-speed operation parts.
Such as, the above-mentioned movable swash plate 517 in the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) be configured to deflection angle be emergency 2 stage or 3 stages have level.
In addition, in the present embodiment, above-mentioned working truck, as shown in Fig. 2 B and Figure 11, possesses and is inserted in and a pair reduction gear unit 550 between the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) corresponding driving wheels 501,502 and can respectively to a pair brake unit 560 of the motor drive shaft 515 additional brake power of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) by folder.The rotor part of above-mentioned brake unit 560 is fixed on the inner end of each of said motor axle 515.
In addition, in the present embodiment, above-mentioned port block 513 has and the above-mentioned first and second port block 10 (1), 10 (2) identical base configurations, and the outer surface around the input part of above-mentioned installation base 13 and above-mentioned reduction gear unit 550 carries out bolt link.
Mode of execution 2
Below, with reference to accompanying drawing, other mode of execution preferred of pump unit of the present invention is described.
Figure 14 is the sectional view of the pump unit 100 representing present embodiment.
As shown in figure 14, said pump unit 100 is made into the first and second oil hydraulic pump arranged in series amphistyly on the same line.
Namely, said pump unit 100 possesses the port block 110 being formed with multiple oil circuit, with the first oil hydraulic pump 15 (1) of the first pump side end face 110 (1) sliding contact of the thickness direction one side side of above-mentioned port block 110, with the second oil hydraulic pump 15 (2) of the second pump side end face 110 (2) sliding contact of thickness direction the opposing party side of said pump unit, to form the first pump casing 16 (1) linked mode and the above-mentioned port block 110 in the first pump space P (1) that above-mentioned first oil hydraulic pump 15 (1) is accommodated, to form the second pump casing 16 (2) linked mode and the above-mentioned port block 110 in the second pump space P (2) that above-mentioned second oil hydraulic pump 15 (2) is accommodated.
Said pump unit 100 is such as applied to working truck as the parts forming driving system speed change gear 500.
Figure 15 is the hydraulic circuit diagram representing the driving system speed change gear 500 applying said pump unit 100.
In the above-mentioned driving system speed change gear 500 shown in Figure 15, above-mentioned first oil hydraulic pump 15 (1) of said pump unit 100 cooperates with first oil hydraulic motor 511 (1) of the side 500 (1) driven in pairing left and right first and second driving wheel 500 (1), 500 (2), form a HST, above-mentioned second oil hydraulic pump 15 (2) cooperate with second oil hydraulic motor 511 (2) of the opposing party 500 (2) driven in above-mentioned a pair first and the second driving wheel 500 (1), 500 (2), formation the 2nd HST.
In detail, as shown in figure 15, above-mentioned working truck, on the basis of said pump unit 100, also possesses the motor 505 of the power source becoming said pump unit 100; Above-mentioned a pair first and the second driving wheel 500 (1), 500 (2); First oil hydraulic motor unit 510 (1), it has and to be connected with above-mentioned first oil hydraulic pump 15 (1) fluid through a pair first hydraulic lines 410 (1) and to form above-mentioned first oil hydraulic motor 511 (1) of an above-mentioned HST, and is exported towards above-mentioned first driving wheel 500 (1) by the rotating power of above-mentioned first oil hydraulic motor 511 (1); Second oil hydraulic motor unit 510 (2), it to be connected with above-mentioned second oil hydraulic pump 15 (2) fluid through a pair second hydraulic lines 410 (2) and to form above-mentioned second oil hydraulic motor 511 (2) of above-mentioned 2nd HST, and is exported to above-mentioned second driving wheel 500 (2) by the rotating power of above-mentioned second oil hydraulic motor 511 (2); Operatively driven by above-mentioned motor 505, and as above-mentioned first and the 2nd make-up pump 530 of playing a role of the working oil supply source of HST; With the fuel tank 540 that the oil sources as above-mentioned make-up pump 530 plays a role.
As shown in figure 15, above-mentioned port block 110 is formed a pair first oil hydraulic pump working oil path 411 (1) and a pair second oil hydraulic pump working oil path 411 (2), described a pair first oil hydraulic pump working oil path 411 (1) form a part for above-mentioned a pair first hydraulic lines 410 (1), and described a pair second oil hydraulic pump working oil path 411 (2) form a part for above-mentioned a pair second hydraulic lines 410 (2).
In the present embodiment, as shown in figure 14, above-mentioned port block 110 comprises first end buccal mass 111 and the second port block 112, described first end buccal mass 111 has above-mentioned first pump side end face 110 (1) and is linked with above-mentioned first pump casing 15 (1), and above-mentioned first pump side end face 110 (1) comprises the slide contact zone 110a (1) by above-mentioned first oil hydraulic pump 15 (1) sliding contact; Described second port block 112 has above-mentioned second pump side end face 110 (2) and is linked with above-mentioned second pump casing 16 (2), and above-mentioned second pump side end face 110 (2) comprises the slide contact zone 110a (2) by above-mentioned second oil hydraulic pump 15 (2) sliding contact.
Above-mentioned slide contact zone 110a (1), 110a (2) each on a pair kidney shape port (not shown) communicated with the suction/discharge portion of the above-mentioned first and second corresponding oil hydraulic pump 15 (1), 15 (2) is set, through above-mentioned a pair kidney shape port supply and discharge working oil between the above-mentioned oil hydraulic pump of correspondence and the above-mentioned oil hydraulic pump working oil path of correspondence.
In addition, in the present embodiment, as shown in figure 14, the end face with above-mentioned suction/discharge portion of above-mentioned oil hydraulic pump 15 (1), 15 (2) is made into concavity sphere, and the outer surface of above-mentioned slide contact zone is made into the convex sphere engaged with above-mentioned concavity sphere.
In detail, as shown in figure 14, above-mentioned first end buccal mass 111 have the first end face 111 (1) of forming above-mentioned first pump side end face 110 (1) and with second end face 111 (2) of above-mentioned first end face 111 (1) in the contrary side of thickness direction.
On the other hand, above-mentioned second port block 112 have the first end face 112 (1) of forming above-mentioned second pump side end face 110 (2) and with second end face 112 (2) of above-mentioned first end face 112 (1) in the contrary side of thickness direction.
And the above-mentioned first and second port block 111,112 is linked under above-mentioned second end face 111 (2), 112 (2) states against each other.
Figure 16 is the sectional view of the above-mentioned first end buccal mass 111 represented along the XVI-XVI line in Figure 14.
In addition, Figure 17 is the sectional view of above-mentioned second port block 112 represented along the XVII-XVII line in Figure 14.
As shown in Figure 16 and Figure 17, in the present embodiment, above-mentioned a pair first oil hydraulic pump working oil path 411 (1) are formed at above-mentioned first end buccal mass 111, and above-mentioned a pair second oil hydraulic pump working oil path 411 (2) are formed at above-mentioned second port block 112.
As shown in figure 16, above-mentioned a pair first oil hydraulic pumps by working oil path 411 (1) under the state be connected with above-mentioned first oil hydraulic pump 15 (1) fluid, at least one end surface opening outside, forms a pair first supply and discharge port 411P (1).
In detail, as shown in Figure 14 and Figure 16, above-mentioned first end buccal mass 111 being formed by axis hole 111a through between the above-mentioned first and second end face 111 (1), 111 (2), inserting for driving the first pump shaft 17 (1) of corresponding above-mentioned first oil hydraulic pump 15 (1).
As shown in figure 16, above-mentioned a pair first oil hydraulic pump working oil path 411 (1) have: mutually relatively extend with first direction, plate face of parallel state at above-mentioned first end buccal mass 111 across above-mentioned axis hole 111a, and in the mode be connected with above-mentioned first oil hydraulic pump 15 (1) fluid in the pair of parallel portion 415 of above-mentioned first end face 111 (1) opening; Extend also surface opening outside from above-mentioned pair of parallel portion 415 to above-mentioned first side side, direction one, plate face, form a pair main opening portion 416 of above-mentioned a pair first supply and discharge port 411P (1).
In addition, in the present embodiment, above-mentioned a pair first oil hydraulic pump working oil path 411 (1) have a pair secondary opening portion 417 extending also surface opening outside from above-mentioned pair of parallel portion 415 to above-mentioned first direction, plate face opposite side, and above-mentioned a pair secondary opening portion 417 is blocked by embolism 417a.
Equally, as shown in figure 17, above-mentioned a pair second oil hydraulic pumps are by working oil path 411 (2) under the state be connected with above-mentioned second oil hydraulic pump 15 (2) fluid, and at least one end surface opening outside, forms a pair second supply and discharge port 411P (2).
In detail, as shown in Figure 14 and Figure 17, above-mentioned second port block 112 being formed by axis hole 112a through between the above-mentioned first and second end face 112 (1), 112 (2), inserting for driving the second pump shaft 17 (2) of corresponding above-mentioned second oil hydraulic pump 15 (2).
As shown in figure 17, above-mentioned a pair second oil hydraulic pump working oil path 411 (2) have: mutually relatively extend with first direction, plate face of parallel state in above-mentioned second port block 112 across above-mentioned axis hole 112a, and in the mode be connected with above-mentioned second oil hydraulic pump 15 (2) fluid in the pair of parallel portion 425 of above-mentioned first end face 112 (1) opening; Extend also surface opening outside with from above-mentioned pair of parallel portion 425 to above-mentioned first side side, direction one, plate face, and form a pair main opening portion 426 of above-mentioned a pair second supply and discharge port 411P (2).
In addition, in the present embodiment, above-mentioned a pair second oil hydraulic pump working oil path 411 (2) have a pair secondary opening portion 427 extending also surface opening outside from above-mentioned pair of parallel portion 425 to above-mentioned first direction, plate face opposite side, and above-mentioned a pair secondary opening portion 427 is blocked by embolism 427a.
As shown in figure 15, above-mentioned port block 100 is also formed: the supplementary oil circuit 430 (1) of the first oil hydraulic pump that the pressure oil from the above-mentioned make-up pump 530 played a role as working oil supply source is guided to above-mentioned a pair first oil hydraulic pump working oil path 411 (1) through pair of check valves 435; With the supplementary oil circuit 430 (2) of the second oil hydraulic pump that the pressure oil from above-mentioned make-up pump 530 is guided to above-mentioned a pair second oil hydraulic pump working oil path 421 through pair of check valves 435.
Have in the present embodiment of the above-mentioned first and second port block 111,112 in above-mentioned port block 110, the supplementary oil circuit 430 (1), 430 (2) of the above-mentioned first and second oil hydraulic pump is formed on the above-mentioned first and second port block 111,112 respectively.
In detail, as shown in figure 16, above-mentioned first oil hydraulic pump can surface opening outside with the end supplementing oil circuit 430 (1), mineralization pressure oil receiving port 430P, and the other end is branched, be connected with above-mentioned a pair first pumps working oil path 411 (1) fluid through above-mentioned safety check 435 respectively.
Equally, as shown in figure 17, above-mentioned second oil hydraulic pump can surface opening outside with the end supplementing oil circuit 430 (2), mineralization pressure oil receiving port 430P, and the other end is branched, be connected with above-mentioned a pair second pumps working oil path 411 (2) fluid through above-mentioned safety check 435 respectively.
In the present embodiment, for the pressure oil from above-mentioned make-up pump 530 is used the simplification supplementing oil circuit 430 (1), 430 (2) conduits structure supplied to the above-mentioned first and second oil hydraulic pump, following structure is adopted to seek.
Namely, above-mentioned first and second oil hydraulic pump is being used supplementary oil circuit 430 (1), above-mentioned pressure oil receiving port 430P embolism 431 (see Fig. 3) blocking of the supplementary oil circuit (being that above-mentioned first oil hydraulic pump is with supplementing oil circuit 430 (1) in the present embodiment) of any one party of 430 (2), and under the state that above-mentioned make-up pump 530 is connected with the above-mentioned pressure oil receiving port 430P fluid of the supplementary oil circuit (in the present embodiment for above-mentioned second oil hydraulic pump is with supplementing oil circuit 430 (2)) of the opposing party, make a part for the pressure oil of the supplementary oil circuit of the opposing party to the supplementary oil circuit shunting of a side.
Specifically, as shown in Figure 14, Figure 16 and Figure 17, the above-mentioned first and second port block 111,112 each on be provided with an end and connect with corresponding above-mentioned supplementary oil circuit 430 (1), 430 (2) fluid, and the other end is at above-mentioned second end face 111 (2), 112 (2) opening, and forms branch's oil circuit 440 of connecting port 440P.
Above-mentioned connecting port 440P is as shown in Figure 16 and Figure 17, passing above-mentioned axis hole 111a, be positioned at along above-mentioned first direction, plate face and above-mentioned port block 111 under the state of the axis of 112a, on the imaginary plane IP of the thickness direction of 112, accordingly, by making the above-mentioned first and second port block 111, above-mentioned second end face 111 (2) of 112, under 112 (2) states against each other, by two ends buccal mass 111, 112 link, the above-mentioned connecting port 440P of above-mentioned first end the buccal mass 111 and above-mentioned connecting port 440P of above-mentioned second port block 112 is fluidly connected thus.
As shown in figure 15, the said pump unit 100 of present embodiment also has setting above-mentioned first and second oil hydraulic pump with supplementing the single relief valve 450 of oil pressure of oil circuit 430 (1), 430 (2), the first overflow discharge oil circuit 460 (1) guided to above-mentioned first pump space P (1) by the oil overflow from above-mentioned relief valve 450, the second overflow discharge oil circuit 460 (2) of being guided to above-mentioned second pump space P (2) by above-mentioned oil overflow.
As previously mentioned, in the said pump unit 100 of present embodiment, above-mentioned port block 110 comprises the above-mentioned first and second port block 111,112.
In this case, above-mentioned single relief valve 450 is assembled in the side (being above-mentioned first end buccal mass 111 in the present embodiment) in the above-mentioned first and second port block 111,112.
Figure 18 represents the sectional view along the XVIII-XVIII line in Figure 14.
In addition, Figure 19 represents the end elevation along the XIX-XIX line in Figure 18.
As shown in Figure 16 and Figure 18, a side (being above-mentioned first end buccal mass 111 in the present embodiment) in the above-mentioned first and second port block 111,112, forms an end and to be connected with corresponding above-mentioned supplementary oil circuit 430 (1) fluid and the perforation 459 of the other end surface opening outside at depended on pressure oil flow direction upstream side compared with above-mentioned safety check 435.
And above-mentioned relief valve 450 is inserted in above-mentioned perforation 459 from above-mentioned the other end in the mode of first side towards above-mentioned supplementary oil circuit 430 (1).
In the present embodiment, the base configuration of the above-mentioned first and second port block 111,112 is common.
Namely, the above-mentioned first and second port block 111,112 possesses except this point of above-mentioned safety check 435 except a side (being above-mentioned first end buccal mass 111 in the present embodiment), is the port block with structure identical in fact.
In detail, port block (being above-mentioned second port block 112 in the present embodiment) in the side of unassembled above-mentioned relief valve 450, as shown in Figure 17 and Figure 18, also forms an end and to be connected with corresponding above-mentioned supplementary oil circuit 430 (2) fluid and the perforation 459 of the other end surface opening outside at depended on pressure oil flow direction upstream side compared with above-mentioned safety check 435.
And in the port block 12 of the side of unassembled above-mentioned relief valve 450, the other end of above-mentioned perforation 459 is blocked by embolism 458.
In addition, as shown in Figure 16 and Figure 17, the above-mentioned first and second port block 111,112 each on, the corner when seeing along thickness of slab direction is provided with installation base 13.By possessing this installation base 13, the versatility of the above-mentioned first and second port block 111,112 can be improved.Namely, by possessing above-mentioned installation base 13, can also with by corresponding for each normalized form of installing to fixed component independently of the above-mentioned first and second port block 111,112.
Above-mentioned first overflow discharge oil circuit 460 (1) as shown in figure 18, be connected with the secondary side fluid of an end with above-mentioned relief valve 450, and the other end is in the mode of pump space (being the first pump space P (1) in the present embodiment) opening of correspondence, be formed at the port block (being above-mentioned first end buccal mass 111 in the present embodiment) of the side being assembled with above-mentioned relief valve 450.
In detail, the region of the other end beyond the above-mentioned slide contact zone 110a (1) of correspondence of above-mentioned first overflow discharge oil circuit 460 (1), at above-mentioned first end face 111 (1) opening.
On the other hand, above-mentioned second overflow discharge oil circuit 460 (2) comprises as shown in figure 18: be formed at the upstream side part 461 in the port block (in the present embodiment for above-mentioned first end buccal mass 111) of the side being assembled with above-mentioned relief valve 450, to be connected with the secondary side fluid of above-mentioned relief valve 450 to make an end and the other end at above-mentioned second end face 111 (2) opening; Be formed at unassembled above-mentioned relief valve 450 side port block (in the present embodiment for above-mentioned second port block 112) on downstream side part 462, be connected with the pump space making above-mentioned upstream side part 461 be formed with the port block of the side by unassembled above-mentioned relief valve 450 (being the second pump space P (2) in the present embodiment) fluid.
In detail, one end of above-mentioned downstream side part 462 in the mode be connected with above-mentioned upstream portion shunting body at above-mentioned second end face 112 (2) opening, and the region of the other end beyond the above-mentioned slide contact zone 110a (2) of correspondence, at above-mentioned first end face 112 (1) opening.
In addition, in the present embodiment, as shown in Figure 16 and Figure 17, the bypass valve 480 being communicated with selectively or cutting off between above-mentioned a pair working oil path 411 (1) (411 (2)) that each of the above-mentioned first and second port block 111,112 possesses correspondence.
Have again, as shown in figure 15, said pump unit 100 is provided with by the first externally open pump side discharge port 470 (1) of above-mentioned first pump space P (1) with by the second externally open for above-mentioned second pump space P (2) pump side discharge port 470 (2).
Above-mentioned first pump side discharge port 470 (1) is formed at least one party of above-mentioned port block 110 and above-mentioned first pump casing 16 (1), and above-mentioned second pump side discharge port 470 (2) is formed at least one party of above-mentioned port block 110 and above-mentioned second pump casing 16 (2).
As shown in figure 14, in the present embodiment, above-mentioned first pump side discharge port 470 (1) is formed at above-mentioned first pump casing 16 (1), and above-mentioned second pump side discharge port 470 (2) is formed at above-mentioned second pump casing 16 (2).
Like this, the said pump unit 100 of present embodiment is configured to, respectively by the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) the above-mentioned first and second pump spaces P (1) being housed in a side side and the opposing party side being formed at above-mentioned port block 110, in duplex pump unit in P (2), set for supplementing oil circuit 430 (1) and the oil pressure for supplementing oil circuit 430 (2) to the above-mentioned second oil hydraulic pump use of the above-mentioned 2nd HST supply working oil comprising above-mentioned second oil hydraulic pump 15 (2) to the above-mentioned first oil hydraulic pump use of the above-mentioned HST supply working oil comprising above-mentioned first oil hydraulic pump 15 (1) by single above-mentioned relief valve 450, accordingly, seek part common bring with low cost.
Have again, said pump unit 100 is configured to, the above-mentioned first and second oil hydraulic pump 15 (1) can be positioned at relative to axial direction, above-mentioned port block 110 between 15 (2) is assembled above-mentioned single relief valve 450, and by the oil overflow from above-mentioned relief valve 450 respectively to the above-mentioned first and second pump space P (1), P (2) guides, and, by the above-mentioned first and second pump space P (1), the oil in reserve of P (2) is through the above-mentioned first and second pump side discharge port 470 (1), 470 (2) externally discharge, accordingly, additional part need not be equipped with, just can make the above-mentioned first and second pump space P (1), oil in reserve in P (2) circulates effectively, accordingly, the temperature of above-mentioned oil in reserve can be effectively suppressed to rise.
In above-mentioned port block 110, preferably form the through hole making the above-mentioned first and second pump space P (1), the connection of P (2) fluid.
As previously mentioned, in the present embodiment, above-mentioned port block 110 has the above-mentioned first and second port block 111,112.
Therefore, as shown in Figure 16 and Figure 17, above-mentioned through hole comprises the first through hole 111b being formed at above-mentioned first end buccal mass 111 and the second through hole 112b being formed at above-mentioned second port block 112.
One end of above-mentioned first through hole 111b is at above-mentioned first end face 111 (1) opening, to be connected with above-mentioned first pump space P (1) fluid, and the other end is at above-mentioned second end face 111 (2) opening.
One end of above-mentioned second through hole 112b is at above-mentioned first end face 112 (1) opening, to be connected with above-mentioned second pump space P (2) fluid, and the other end is at above-mentioned second end face 112 (2) opening, to be connected with above-mentioned first through hole 111b fluid.
In the said pump unit 100 of present embodiment, as shown in figure 14, the state that above-mentioned first pump shaft 17 (1) extends from above-mentioned first pump space P (1) outward with an end, rotate about the axis and be freely supported on above-mentioned first pump casing 16 (1) and above-mentioned first end buccal mass 111, can to the rotating power of an end input of above-mentioned first pump shaft 17 (1) from above-mentioned motor 505.
Above-mentioned second pump shaft 17 (2) is on coaxial with above-mentioned first pump shaft 17 (1), so that the state of above-mentioned first pump shaft 17 (1) can not be linked to the relative rotation, rotates about the axis and be freely supported on above-mentioned second pump casing 16 (2) and above-mentioned second port block 112.
As shown in figure 14, in the present embodiment, above-mentioned make-up pump 530 is driven by the rotating power from above-mentioned second pump shaft 16 (2).
Namely, an end of above-mentioned second pump shaft 16 (2) and the other end of above-mentioned first pump shaft 16 (1) can not link with the relative rotation, and, from the other end to above-mentioned make-up pump 530 outputting rotary power.
Above-mentioned make-up pump 530 can be adopted in various manners, but, make gear pump in the present embodiment.
Figure 20 is the end elevation of the XX-XX line represented along Figure 14.
In detail, as shown in Figure 14 and Figure 20, above-mentioned make-up pump 530 comprises: the make-up pump shell 531 linked with said pump unit 100; Live axle 535, it is supported on above-mentioned make-up pump shell 531, and can not be linked to above-mentioned second pump shaft 27 with the relative rotation around axis; The driven shaft 536 of above-mentioned make-up pump shell 531 is supported on the state parallel with above-mentioned live axle 535; The actuation gear 537 of above-mentioned make-up pump shell 531 is accommodated in the state that can not be supported on above-mentioned live axle 535 with the relative rotation; Driven gear 538, it, under the state being supported on above-mentioned driven shaft 536 in the mode engaged with above-mentioned actuation gear 537, is accommodated in above-mentioned make-up pump shell 531.
As shown in Figure 14 and Figure 20, above-mentioned make-up pump shell 531 comprises the housing main body 532 linked with corresponding above-mentioned second pump casing 16 (2) and the cover 533 linked with above-mentioned housing main body 532.
As shown in figure 20, above-mentioned housing main body 532 is linked to the end face of above-mentioned second pump casing 16 (2) dismantledly through secure component 532a such as bolts, and above-mentioned cover 533 is linked to above-mentioned housing main body 532 dismantledly through secure component 533a such as bolts.
The said pump unit 100 of present embodiment as shown in figure 14, is supported on the fixed components such as vehicle frame 503 through above-mentioned first pump casing 16 (1).
Figure 21 and Figure 22 is the end elevation represented respectively along the XXI-XXI line in Figure 14 and XXII-XXII line.
In detail, as shown in Figure 14 and Figure 21, link base member 18 at the end face of above-mentioned first pump casing 16 through secure component 19a such as bolts, said pump unit 100 is fixed on fixation portions part 503 by the state being positioned in fixation portions part 503 through the secure components such as bolt 504 with above-mentioned base member 18.
In the said pump unit 100 of present embodiment, common in order to seek part, the above-mentioned first and second pump casing 16 (1), 16 (2) is made identical structure.
Therefore, as shown in Figure 21 and Figure 22, the end face of each of the above-mentioned first and second pump casing 16 (1), 16 (2) is formed with the fastener hole 532b of above-mentioned make-up pump the shell 531 and fastener hole 19b of above-mentioned base member 18.
The said pump unit 100 of present embodiment is made into the variable volume of the volume that can change the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) respectively.
In detail, as shown in Figure 14 and Figure 15, said pump unit 100 also possesses a pair volume regulating mechanism 30 of the volume changing the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) respectively.
Figure 23 represents the sectional view along the XXIII-XXIII line in Figure 18.
As shown in Figure 1, above-mentioned volume regulating mechanism 30 has by deflecting the movable swash plate 31 of the volume changing corresponding above-mentioned oil hydraulic pump around with corresponding above-mentioned pump shaft 17 (1), 17 (2) orthogonal swing reference axis (not shown).
In the said pump unit 100 of present embodiment, above-mentioned movable swash plate 31 utilizes the effect of hydraulic pressure to deflect.
In detail, as shown in Figure 15 and Figure 23, said pump unit 100 possesses a pair hydraulic servomechanism 35 making the above-mentioned movable swash plate 31 of the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) deflect respectively.
Above-mentioned hydraulic servomechanism has as shown in Figure 15 and Figure 23: piston 352, and it is to be reciprocally housed in above-mentioned cylinder 351 by fluid tight for the inner space of cylinder 351 the mode rotating forward room 351a and reversion room 351b that is separated into; From the supply pipeline 356 of pressure oil supply source supply pressure oil; By the discharge pipe 357 that pressure oil guides to oil storage tank; The rotating forward pipeline 358 be connected with above-mentioned rotating forward room and above-mentioned reversion room fluid respectively and the pipeline 359 that reverses; Switching valve 353, it is connected with above-mentioned supply pipeline 356 and above-mentioned discharge pipe 357 at first side fluid, and is connected with above-mentioned rotating forward pipeline 358 and above-mentioned reversion pipeline 359 in secondary side fluid.
Above-mentioned switching valve 353 can through being obtained the holding position above-mentioned rotating forward pipeline 358 and above-mentioned reversion pipeline 359 blocked selectively by the input arm 353a of peripheral operation, above-mentioned supply pipeline 356 is made to be connected with above-mentioned rotating forward pipeline 358 fluid and to make the forward position that above-mentioned discharge pipe 357 is connected with above-mentioned reversion pipeline 359 fluid, above-mentioned supply pipeline 356 is made to be connected with above-mentioned reversion pipeline 359 fluid and to make the backward position that above-mentioned discharge pipe 357 is connected with above-mentioned rotating forward pipeline 358 fluid.
In addition, the main variable-speed operation parts such as operating stem of possessing of the linkage mechanism of above-mentioned input arm 353a outside figure and above-mentioned working truck operatively links.
Above-mentioned piston 352 correspondingly moves to forward direction in the axial direction with the supply to the pressure oil of above-mentioned rotating forward room 351a, and correspondingly moves to reverse directions in the axial direction with the supply of the pressure oil to above-mentioned reversion room 351b.
Above-mentioned piston and above-mentioned movable swash plate 31 place of working link, correspondingly to make above-mentioned movable swash plate 31 deflect to forward direction around above-mentioned swing reference axis with the movement to the forward direction along axial direction, and above-mentioned movable swash plate 31 is correspondingly made to deflect to reverse directions around above-mentioned swing reference axis with the movement to the reverse directions along axial direction.
In the present embodiment, as shown in figure 15, above-mentioned supply pipeline 356 connects with the segment fluid flow being positioned at depended on pressure oil flow direction upstream side compared with above-mentioned pair of check valves 435 in corresponding above-mentioned supplementary oil circuit 430 (1), 430 (2), receives the pressure oil set by above-mentioned relief valve 450.
According to this structure, with low costization brought relative to the simplification of the pressure oil supplying structure of above-mentioned hydraulic servomechanism 35 can be sought.
In detail, above-mentioned supply pipeline 356 as shown in figure 18, comprise be formed in the above-mentioned first and second port block 111,112 each on port block side supply oil circuit 356a and be formed in the above-mentioned first and second pump casing 16 (1), 16 (2) each on pump casing side supply oil circuit 356b.
Above-mentioned port block side supply oil circuit 356a is as shown in Figure 14, Figure 16, Figure 17 and Figure 18, one end connects with the depended on pressure oil flow direction upstream portion shunting body compared with above-mentioned pair of check valves 435 that is positioned in corresponding above-mentioned supplementary oil circuit 430 (1), 430 (2), further, the other end is at above-mentioned second end face 111 (2), 112 (2) opening.
Said pump shell side supply oil circuit 356a is as shown in Figure 14, Figure 18 and Figure 19, supply mode that oil circuit 356a fluid is connected at the abutment portion opening with above-mentioned port block 111,112 with an end and above-mentioned port block side, and the other end is connected with the first side fluid of above-mentioned switching valve 353.
As shown in figure 15, above-mentioned working truck possesses above-mentioned first oil hydraulic motor unit 510 (1) and above-mentioned second oil hydraulic motor unit 510 (2), above-mentioned first oil hydraulic motor unit 510 comprises above-mentioned first oil hydraulic motor 511 forming an above-mentioned HST with above-mentioned first oil hydraulic pump 15 (1) collaboratively, and above-mentioned second oil hydraulic motor unit 510 (2) comprises above-mentioned second oil hydraulic motor 511 (2) forming above-mentioned 2nd HST with above-mentioned second oil hydraulic pump 15 (2) collaboratively.
In addition, above-mentioned second oil hydraulic motor unit 510 (2) has the structure identical with above-mentioned first oil hydraulic motor unit 510 (1).Therefore, the explanation of following above-mentioned first oil hydraulic motor unit 510 (1) is also applicable to above-mentioned second oil hydraulic motor unit 510 (2).
Figure 24 represents the sectional view near above-mentioned first oil hydraulic motor unit 510 (1).
Further, Figure 25 is the sectional view representing above-mentioned first oil hydraulic motor unit 510 (1).
As shown in Figure 15 and Figure 25, be provided with a pair externally open for the first motor space M (1) of above-mentioned first oil hydraulic motor 511 (1) of collecting first motor-side discharge port 570 (1) at above-mentioned first oil hydraulic motor unit 510 (1).
Equally, be provided with a pair externally open for the second motor space M (2) of above-mentioned second oil hydraulic motor 511 (2) of collecting second motor-side discharge port 570 (2) at above-mentioned second oil hydraulic motor unit 510 (2).
And, as shown in figure 15, a side in above-mentioned a pair first motor-side discharge port 570 (1) is connected with above-mentioned first pump side discharge port 470 (1) fluid, and, the opposing party in above-mentioned a pair first motor-side discharge port 570 (1) is connected with above-mentioned fuel tank 540 fluid, a side in above-mentioned a pair second motor-side discharge port 570 (2) is connected with above-mentioned second pump side discharge port 470 (2) fluid, further, the opposing party in above-mentioned a pair second motor-side discharge port 570 (2) is connected with above-mentioned fuel tank 540 fluid.
According to this structure, additional parts need not be equipped with, oil in reserve just can be made positively to circulate between the above-mentioned first and second pump space P (1), P (2), the above-mentioned first and second motor space M (1), M (2) and above-mentioned fuel tank 540, can effectively prevent the temperature of the above-mentioned first and second oil hydraulic pump 15 (1), 15 (2) and above-mentioned first and second oil hydraulic motor 511 (1), 511 (2) from rising.
Each of above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) has: port block 513; With the above-mentioned oil hydraulic motor 511 (1) (511 (2)) of above-mentioned port block 513 sliding contact; The motor case 514 linked with above-mentioned port block 513, to form said motor space M (1) (M (2)) of accommodating above-mentioned oil hydraulic motor 511 (1) (511 (2)); Motor drive shaft 515, it, can not support the state of above-mentioned oil hydraulic motor 511 (1) (511 (2)) with the relative rotation, rotates about the axis and is freely supported on above-mentioned port block 513 and said motor shell 514.
And, said motor shell 514 is formed above-mentioned a pair motor-side discharge port 570 (1) (570 (2)).
In addition, in the present embodiment, each of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) is made into the fixing fixed volume type of the volume of the above-mentioned oil hydraulic motor 511 (1) (511 (2)) of correspondence.
Namely, as shown in Figure 24 and Figure 25, each of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) also has the fixing swash plate 516 above-mentioned oil hydraulic motor 511 (1) (511 (2)) of correspondence being fixed as specified volume.
Certainly, also can as shown in figure 26, each of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) possesses the movable swash plate 517 of alternative above-mentioned fixing swash plate 516.
In this case, the moment of torsion driving the traveling of above-mentioned driving wheel to export can be improved.
In addition, the above-mentioned movable swash plate 517 of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) is mutual relatively with synchronous state of operation by single secondary variable-speed operation parts.Namely, the above-mentioned movable swash plate 517 of above-mentioned first oil hydraulic motor unit 510 (1) and the above-mentioned movable swash plate 517 of above-mentioned second oil hydraulic motor unit 510 (2) link through linkage mechanism and above-mentioned single secondary variable-speed operation parts work.
In addition, in the present embodiment, above-mentioned working truck, as shown in Figure 15 and Figure 24, possesses: be inserted in a pair reduction gear unit 550 between the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2) and corresponding driving wheel 500 (1), 500 (2) by folder; With can respectively to a pair brake unit 560 of the motor drive shaft 515 additional brake power of the above-mentioned first and second oil hydraulic motor unit 510 (1), 510 (2).
In addition, in the present embodiment, above-mentioned port block 513 has and the above-mentioned first and second port block 111,112 identical base configurations, and the outer surface around the input part of above-mentioned installation base 13 and above-mentioned reduction gear unit 550 carries out bolt link.
Description of reference numerals
1: pump unit; 10 (1): first end buccal mass; 10 (2): the second port block; 11a: the first end face; 11b: the second end face; 12a: the first side; 12b: the second side; 12c: the three side; 12d: the four side; 14 (1): first axle hole; 14 (2): the second axis holes; 15 (1): the first oil hydraulic pumps; 15 (2): the second oil hydraulic pumps; 16 (1): the first pump casings; 16 (2): the second pump casings; 17 (1): the first pump shafts; 17 (2): the second pump shafts; 100: pump unit; 110: port block; 111: first end buccal mass; 111 (1): the first end faces; 111 (2): the second end faces; 112: the second port block; 112 (1): the first end faces; 112 (2): the second end faces; 400a: the first perforation; 400b: the second perforation; 400c: the three perforation; 400d: the four perforation; 400e: the five perforation; 400f: the six perforation; 400g: the seven perforation; 400h: the eight perforation; 411 (1): the first oil hydraulic pump working oil path; 411 (2): the second oil hydraulic pump working oil path; 411P (1): first supply and discharge port; 411P (2): second supply and discharge port; 415: parallel portion; 430 (1): the first supplement oil circuit; 430 (2): the second supplement oil circuit; 430P: pressure oil receiving port; 431: embolism; 435: safety check; 440 (1): the first branch's oil circuits; 440 (2): the second branch's oil circuits; 440P: connecting port; 450: relief valve; 460 (1): the first overflow discharge oil circuits; 460 (2): the second overflow discharge oil circuits; 461: upstream side part; 462: downstream side part; 470 (1): the first pump side discharge port; 470 (2): the second pump side discharge port; 480: bypass valve; 500 (1): the first driving wheels; 500 (2): the second driving wheels; 505: motor; 510 (1): the first oil hydraulic motor unit; 510 (2): the second oil hydraulic motor unit; 511 (1): the first oil hydraulic motors; 511 (2): the second oil hydraulic motors; 530: make-up pump; 540: fuel tank; 570 (1): the first motor-side discharge port; 570 (2): the second motor-side discharge port; P (1): first pump space; P (2): second pump space; IP: imaginary plane.

Claims (7)

1. the unit of pump more than, is characterized in that, comprising: the first oil hydraulic pump; First end buccal mass, its have for above-mentioned first oil hydraulic pump sliding contact directly or indirectly the first end face and with second end face of above-mentioned first end face in the opposite side of thickness direction; First pump casing, it is to link around the mode of above-mentioned first oil hydraulic pump and the first end face of above-mentioned first end buccal mass; Second oil hydraulic pump; Second port block, its have for above-mentioned second oil hydraulic pump sliding contact directly or indirectly the first end face and with second end face of above-mentioned first end face in the contrary side of thickness direction; With the second pump casing, it is to link around the mode of above-mentioned second oil hydraulic pump and the first end face of above-mentioned second port block,
The common ground of the above-mentioned first and second port block is to have: axis hole, and described axis hole is by through between the above-mentioned first and second end face, so that confession drives the pump shaft of corresponding oil hydraulic pump to insert; A pair working oil path, described a pair working oil path has pair of parallel portion, this pair of parallel portion relatively extends on the first direction, plate face of above-mentioned port block with the state of symmetry mutually across above-mentioned axis hole, and at above-mentioned first end face opening to be connected with above-mentioned hydraulic pump fluid, and the end surface opening outside of described a pair working oil path, forms a pair supply and discharge port; Supplement oil circuit, the end surface opening outside of described supplementary oil circuit, mineralization pressure oil receiving port, and the other end is branched, and is connected respectively through safety check with above-mentioned a pair working oil path fluid; With branch's oil circuit, an end of described branch oil circuit is connected with above-mentioned supplementary oil circuit fluid, and the other end is at above-mentioned second end face opening, forms connecting port,
Above-mentioned connecting port, with the state of axis through above-mentioned axis hole, is positioned at along in the imaginary plane of the thickness direction of above-mentioned first direction, plate face and above-mentioned port block,
A side in the above-mentioned pressure oil receiving port of above-mentioned first end buccal mass and the above-mentioned pressure oil receiving port of above-mentioned second port block is connected with pressure oil supply source fluid, and the opposing party is blocked by embolism,
The relief valve of the oil pressure of the above-mentioned supplementary oil circuit of side's assembling setting only in the above-mentioned first and second port block.
2. many pumps unit as claimed in claim 1, is characterized in that,
Be provided with the first overflow discharge oil circuit and the second overflow discharge oil circuit, the pump space of the side that the oil overflow from above-mentioned relief valve is formed to the port block by the side being equipped with above-mentioned relief valve with corresponding pump casing guides by described first overflow discharge oil circuit; The pump space of the opposing party that above-mentioned oil overflow is formed to the port block by the opposing party not assembling above-mentioned relief valve with corresponding pump casing by described second overflow discharge oil circuit guides,
Above-mentioned first overflow discharge oil circuit is formed on the port block of the side being equipped with above-mentioned relief valve, be connected with above-mentioned relief valve fluid to make an end of above-mentioned first overflow discharge oil circuit, and the other end is at the first end face opening, be connected with the pump space fluid of one side
Above-mentioned second overflow discharge oil circuit comprises: be formed at the upstream side part in the port block of the side being equipped with above-mentioned relief valve, and to make an end be connected with above-mentioned relief valve fluid, and the other end is at the second end face opening; With the downstream side part of port block being formed at the opposing party not assembling above-mentioned relief valve, to make an end at the second end face opening, to be connected with above-mentioned upstream portion shunting body, and the other end is at the first end face opening, and be connected with the pump space fluid of above-mentioned the opposing party
Be formed with at least one party of the port block of a side and the pump casing of correspondence that are equipped with above-mentioned relief valve the discharge port externally opened in the pump space formed by both, be formed with at least one party of the port block of the opposing party and the pump casing of correspondence of not assembling above-mentioned relief valve the discharge port externally opened in the pump space formed by both.
3. many pumps unit as claimed in claim 2, it is characterized in that, each of above-mentioned first and second port block has and extends and the first ~ four side that the periphery of the above-mentioned first and second end face is linked at thickness direction, above-mentioned first and second side is respectively towards above-mentioned first side side, direction one, plate face and the opposing party side, and the above-mentioned 3rd and the 4th side is respectively towards second plate face direction one side side and the opposing party side orthogonal with above-mentioned first direction, plate face
The above-mentioned first and second port block each on formed: a pair first perforation, mutually relatively extend in above-mentioned first direction, plate face with the state of symmetry across above-mentioned axis hole, and an end and the other end are respectively at the above-mentioned first and second lateral opening; Second perforation, its compared with above-mentioned axis hole close to the side of above-mentioned second side, the mode be communicated with between above-mentioned a pair first perforation to be extended along above-mentioned second direction, plate face, and an end and the other end are respectively at the above-mentioned 3rd and the 4th lateral opening; 3rd perforation, one end is at above-mentioned second lateral opening, and bore a hole in the other end and above-mentioned second, fluid is connected; With the 4th perforation, one end and the above-mentioned 3rd fluid of boring a hole is connected, and the other end is at above-mentioned second end face opening, forms above-mentioned branch oil circuit,
Above-mentioned a pair first perforation, by being blocked by the other end embolism, form above-mentioned a pair working oil path that an end is played a role as above-mentioned supply and discharge port,
By inserting above-mentioned safety check respectively from an above-mentioned biperforate end and the other end, under the state that an end of above-mentioned 3rd perforation plays a role as above-mentioned pressure oil receiving port, above-mentioned second perforation and above-mentioned 3rd perforation form above-mentioned supplementary oil circuit
The port block of a side of the above-mentioned relief valve of assembling also arranges the 5th perforation and the 6th perforation, 5th perforation is extending along above-mentioned second direction, plate face close to the side of above-mentioned second side compared with above-mentioned axis hole, to make an end at above-mentioned 3rd lateral opening, and bore a hole in the other end and the above-mentioned 3rd, fluid is connected, and described 5th perforation forms the relief valve patchhole inserted by above-mentioned relief valve from an above-mentioned end; Described 6th perforation under the state of through above-mentioned 5th perforation, an end and the other end at the above-mentioned first and second end face opening,
The port block of the opposing party of unassembled above-mentioned relief valve arranges the 7th perforation, and one end is at above-mentioned second end face opening, and to be connected with the above-mentioned 6th the other end fluid of boring a hole, and the other end is at above-mentioned first end face opening,
The part be positioned near the first end face compared with above-mentioned 5th perforation in above-mentioned 6th perforation forms above-mentioned first overflow discharge oil circuit,
The part and the above-mentioned 7th being positioned at close second end face compared with above-mentioned 5th perforation in above-mentioned 6th perforation is bored a hole and is formed above-mentioned second overflow discharge oil circuit.
4. many pumps unit as claimed in claim 3, is characterized in that, the above-mentioned first and second port block each on formed the 8th perforation, it is extending on above-mentioned second direction, plate face close to the side of above-mentioned first side compared with above-mentioned axis hole,
One end of above-mentioned 8th perforation, under the state of side's opening of the above-mentioned 3rd or the 4th side, is carried out fluid with the both sides of above-mentioned a pair working oil path and is connected,
The bypass valve inserted by the above-mentioned end from above-mentioned 8th perforation between above-mentioned a pair working oil path selectively fluid connects or cuts off.
5. a duplex pump unit, described duplex pump unit possesses: port block; Respectively with the first and second oil hydraulic pump of the thickness direction one side side of above-mentioned port block and the end face sliding contact of the opposing party side; The first pump casing linked with above-mentioned port block, to form the first pump space of above-mentioned first oil hydraulic pump of collecting; And the second pump casing to link with above-mentioned port block, to form the second pump space of above-mentioned second oil hydraulic pump of collecting, it is characterized in that,
Above-mentioned port block is arranged: axis hole, described axis hole is through on the thickness direction of above-mentioned port block, to insert for the pump shaft of above-mentioned first oil hydraulic pump and the second oil hydraulic pump; A pair first oil hydraulic pump working oil path, carrying out under the state that fluid is connected with above-mentioned first oil hydraulic pump, the outer surface opening of one end in a side side in the first plate face direction orthogonal with above-mentioned thickness direction of above-mentioned port block of above-mentioned first oil hydraulic pump working oil path, and form a pair supply and discharge port; First oil hydraulic pump is with supplementing oil circuit, the above-mentioned first oil hydraulic pump outer surface opening of an end in the opposing party side in above-mentioned first direction, plate face supplementing oil circuit, and mineralization pressure oil receiving port, for the pressure oil from pressure oil supply source to above-mentioned pressure oil receiving port supply is supplied to above-mentioned a pair first oil hydraulic pump working oil path through safety check; A pair second oil hydraulic pump working oil path, are carrying out under the state that fluid is connected with above-mentioned second oil hydraulic pump, the outer surface opening of an end in a side side in above-mentioned first direction, plate face of above-mentioned second oil hydraulic pump working oil path, and are forming a pair supply and discharge port; Second oil hydraulic pump is with supplementing oil circuit, above-mentioned second oil hydraulic pump carries out fluid with above-mentioned first oil hydraulic pump with supplementary oil circuit through branch's oil circuit with supplementary oil circuit and is connected, for supplying through the above-mentioned first oil hydraulic pump pressure oil from above-mentioned pressure oil supply source supplementing oil circuit and the oil circuit inflow of above-mentioned branch to above-mentioned a pair second oil hydraulic pump working oil path through safety check; Perforation, one end of above-mentioned perforation is carried out fluid with the above-mentioned first or second oil hydraulic pump with supplementary oil circuit at pressure oil flow direction upstream side by above-mentioned safety check and is connected, and the other end is at the outer surface opening of a side side in the plate face direction orthogonal with above-mentioned first direction, plate face of above-mentioned port block; Set the single relief valve of the above-mentioned first and second oil hydraulic pump with the oil pressure of supplementary oil circuit, above-mentioned relief valve inserts above-mentioned perforation in pressure oil flow direction upstream side to the above-mentioned first or second oil hydraulic pump mode of supplementing oil circuit via above-mentioned safety check with first side; First overflow discharge oil circuit, an above-mentioned end of the first overflow discharge oil circuit is carried out fluid with the second side of above-mentioned relief valve and is connected, and the other end is at the end face opening of the thickness direction one side side of above-mentioned port block, the oil overflow from above-mentioned relief valve is guided to above-mentioned first pump space; With the second overflow discharge oil circuit, an above-mentioned end of the second overflow discharge oil circuit is carried out fluid with the second side of above-mentioned relief valve and is connected, and the other end is at the end face opening of thickness direction the opposing party side of above-mentioned port block, the oil overflow from above-mentioned relief valve is guided to above-mentioned second pump space
Arrange the first externally open pump side discharge port of above-mentioned first pump space at least one party of above-mentioned port block and above-mentioned first pump casing, arrange the second externally open pump side discharge port of above-mentioned second pump space at least one party of above-mentioned port block and above-mentioned second pump casing.
6. duplex pump unit as claimed in claim 5, it is characterized in that, above-mentioned port block comprises: first end buccal mass, its have for above-mentioned first oil hydraulic pump sliding contact thickness direction first end face and with second end face of above-mentioned first end face in thickness direction opposite side; With the second port block, its have for above-mentioned second oil hydraulic pump sliding contact thickness direction first end face and with second end face of above-mentioned first end face in thickness direction opposite side,
Above-mentioned second end face of the above-mentioned first and second port block is linked each other under the state abutted.
7. a working truck, is characterized in that, possesses: the duplex pump unit described in claim 5 or 6; Become the motor of the power source of above-mentioned duplex pump unit; Pairing left and right driving wheel; First oil hydraulic motor unit, it has and cooperates with above-mentioned first oil hydraulic pump and form first oil hydraulic motor of a HST, is exported by the rotating power of above-mentioned first oil hydraulic motor to the side in above-mentioned pair of driving wheels; Second oil hydraulic motor unit, it has and cooperates with above-mentioned second oil hydraulic pump and form second oil hydraulic motor of the 2nd HST, is exported by the rotating power of above-mentioned second oil hydraulic motor to the opposing party in above-mentioned pair of driving wheels; Make-up pump, it is driven by above-mentioned engine operation, plays a role as to the above-mentioned first and second oil hydraulic pump pressure oil supply source supplementing oil circuit; With the fuel tank that the oil sources as above-mentioned make-up pump plays a role,
Arrange a pair externally open for the first motor space of above-mentioned first oil hydraulic motor of collecting first motor-side discharge port at above-mentioned first oil hydraulic motor unit,
Arrange a pair externally open for the second motor space of above-mentioned second oil hydraulic motor of collecting second motor-side discharge port at above-mentioned second oil hydraulic motor unit,
Above-mentioned first pump side discharge port is connected with the side's fluid in above-mentioned a pair first motor-side discharge port, and the opposing party in above-mentioned a pair first motor-side discharge port is connected with above-mentioned fuel tank fluid,
Above-mentioned second pump side discharge port is connected with the side's fluid in above-mentioned a pair second motor-side discharge port, and the opposing party in above-mentioned a pair second motor-side discharge port is connected with above-mentioned fuel tank fluid.
CN201280004683.7A 2011-01-07 2012-01-06 Many pumps unit, duplex pump unit and working truck Expired - Fee Related CN103299073B (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2011-002140 2011-01-07
JP2011002140A JP5702156B2 (en) 2011-01-07 2011-01-07 Tandem pump unit and work vehicle
JP2011-051025 2011-03-09
JP2011051025A JP5576323B2 (en) 2011-03-09 2011-03-09 Multi pump unit
PCT/JP2012/050131 WO2012093705A1 (en) 2011-01-07 2012-01-06 Multi-pump unit, tandem pump unit, and work vehicle

Publications (2)

Publication Number Publication Date
CN103299073A CN103299073A (en) 2013-09-11
CN103299073B true CN103299073B (en) 2016-03-30

Family

ID=46457555

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201280004683.7A Expired - Fee Related CN103299073B (en) 2011-01-07 2012-01-06 Many pumps unit, duplex pump unit and working truck

Country Status (2)

Country Link
CN (1) CN103299073B (en)
WO (1) WO2012093705A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016065482A (en) * 2014-09-24 2016-04-28 ナブテスコ株式会社 Tandem type hydraulic pump
CN106855108A (en) * 2015-12-09 2017-06-16 熵零技术逻辑工程院集团股份有限公司 High pressure chest energy adjustment system
CN108150474A (en) * 2017-12-28 2018-06-12 赛克思液压科技股份有限公司 A kind of adjustable multi-joint volume adjustable hydraulic pump of flow

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000343971A (en) * 1999-06-01 2000-12-12 Yanmar Diesel Engine Co Ltd Hydraulic type continuously variable transmission
JP2001116107A (en) * 1999-10-18 2001-04-27 Kanzaki Kokyukoki Mfg Co Ltd Tandem pump unit
US6793463B1 (en) * 2000-10-30 2004-09-21 Hydro-Gear Limited Partnership Tandem pump and interface for same
CN1701192A (en) * 2003-08-07 2005-11-23 新卡特彼勒三菱株式会社 HST driving circuit

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2847952A1 (en) * 1978-11-04 1980-05-08 Rexroth Gmbh G L HYDRAULIC AXIAL PISTON ENGINE
JP4234505B2 (en) * 2003-06-19 2009-03-04 株式会社 神崎高級工機製作所 Hydraulic drive vehicle
EP1586775A3 (en) * 2004-04-13 2011-11-09 Kanzaki Kokyukoki Mfg. Co., Ltd. Hydraulic pump unit, hydraulic pump set and working vehicle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000343971A (en) * 1999-06-01 2000-12-12 Yanmar Diesel Engine Co Ltd Hydraulic type continuously variable transmission
JP2001116107A (en) * 1999-10-18 2001-04-27 Kanzaki Kokyukoki Mfg Co Ltd Tandem pump unit
US6793463B1 (en) * 2000-10-30 2004-09-21 Hydro-Gear Limited Partnership Tandem pump and interface for same
CN1701192A (en) * 2003-08-07 2005-11-23 新卡特彼勒三菱株式会社 HST driving circuit

Also Published As

Publication number Publication date
WO2012093705A1 (en) 2012-07-12
CN103299073A (en) 2013-09-11

Similar Documents

Publication Publication Date Title
US7320577B1 (en) Dual pump transmission
US7229256B1 (en) Dual pump transmission
US8635867B2 (en) Hydrostatic transmission
US7056101B1 (en) Inline tandem pump
CN101598155B (en) Cooling system for gerotor motor
US7377106B2 (en) Pump system
US20060090639A1 (en) Hydraulic piston pump unit with integral fluid reservoir
CN103299073B (en) Many pumps unit, duplex pump unit and working truck
US20150323051A1 (en) Hydrostatic transmission with spool valve driven motor
US20120097460A1 (en) Hydraulically-powered working vehicle
US8857171B2 (en) Integrated hydrostatic transmission
US10385881B1 (en) Flow divider assembly
JP2013006583A (en) Hydraulic stepless transmission
US7257948B1 (en) Dual pump apparatus
US7695252B2 (en) Pump system and pump unit
US10167937B2 (en) Modular hydrostatic transmission
US10919376B2 (en) Recess-mounted hydraulic pump cartridge and work vehicle drivetrain therewith
JPH0882293A (en) Turning gear
US8974203B2 (en) Hydraulic pump end cover
JP4649585B2 (en) Double pump unit
KR101879663B1 (en) Electric Vane Pump with Single Suction and Double Discharge Passage
JP5576323B2 (en) Multi pump unit
JP5702156B2 (en) Tandem pump unit and work vehicle
JP2006329301A (en) Charge structure for hydrostatic continuously variable transmission
US10859148B1 (en) Modular porting manifold and motor end cover for hydrostatic transmission

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20160330

Termination date: 20180106

CF01 Termination of patent right due to non-payment of annual fee