JP2005076686A - Hydraulic pump mounting device for running vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of man-hours for assembling by integrating a hydraulic fluid intake/supply path, a pump mounting part, and a filter mounting part of a hydraulic pump mounting device for a running vehicle into one case body for miniaturizing and modularizing the whole as one unit. <P>SOLUTION: A plurality of hydraulic pumps 9, 10, 11 mounted to the pump mounting parts 7, 8 with driving shafts 29, 30 coaxially facing to each other are driven by a power transmission mechanism 37 in a transmission case 1. Hydraulic fluid in the transmission case 1 is inhaled and supplied to a plurality of the hydraulic pumps 9, 10, 11 via a hydraulic fluid intake passage 16 in the case body 2, oil filters 12, 13 and a hydraulic fluid distribution room 17. The hydraulic pump mounting parts 7, 8, oil filter mounting parts 14, 15, the hydraulic fluid intake passage 16, and the hydraulic fluid distribution room 17 are put together in the case body 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a hydraulic pump mounting device for a traveling vehicle such as a tractor.

The tractor is equipped with a front loader for performing various cargo handling operations and a backhoe for excavation work as appropriate before and after the vehicle body. Equipped with hydraulic pump.
Some of these hydraulic pumps are directly attached to the engine mounted on the front part of the tractor body, but the hydraulic oil tank is also used as a transmission case integrated with the rear part of the tractor body. In addition, problems have been pointed out, such as the length of the inlet piping member to the hydraulic pump being increased, and the tractor front wheel turning angle being restricted due to the hydraulic pump directly attached to the engine.

Therefore, the present applicant has previously proposed that the above problem is avoided by driving the hydraulic pump in conjunction with the input shaft of the independent PTO clutch in the PTO system mission (see Patent Document 1).
Japanese Patent Laid-Open No. 11-78589 (paragraphs 0030 to 0035, FIG. 5)

  The proposal of Patent Document 1 enables the hydraulic pump to be driven in gear-linked to the input shaft of the independent PTO clutch in the PTO system mission, and moreover, a plurality of hydraulic pumps are driven from one driving source. Although there are advantages that the inlet piping member can be shortened, the restriction of the tractor front wheel cutting angle can be eliminated, and the drive mechanism can be simplified, there are still the following problems. That is, the piping for supplying the hydraulic oil from the hydraulic oil tank to the plurality of hydraulic pumps is separately attached, and the oil filter is also attached separately from the hydraulic pump. In addition, the number of assembling steps has been increased due to the necessity of connecting them separately by hydraulic piping.

  While taking advantage of the above-mentioned advantage of Patent Document 1, the present invention makes the hydraulic oil suction supply path, the pump mounting portion, and the filter mounting portion of the hydraulic pump mounting device of a traveling vehicle into a single case body, and is compacted as a whole. It is an object to reduce the number of assembly steps by modularization.

In order to solve the above-described problems, the present invention includes a case main body that is attached to the outer surface of a transmission case, and a hydraulic pressure for attaching a hydraulic pump that is driven by power transmitted from a power transmission mechanism in the transmission case to the case main body. A pump mounting portion and an oil filter mounting portion for mounting an oil filter for filtering the hydraulic oil in the transmission case and sucking it into the hydraulic pump are provided.
The hydraulic pump mounting portion is formed in a state of being opposed to the case body so that the hydraulic pump can be mounted in a facing manner, and a power transmission mechanism for driving the hydraulic pump to be transmitted from the power transmission mechanism in the transmission case therebetween. Is arranged.

The oil filter mounting portion is formed in a state of facing the case body so that the oil filter can be mounted facing the oil filter.
Furthermore, the case body has a hydraulic oil suction passage for sucking the hydraulic oil in the transmission case toward the oil filter, and a hydraulic oil distribution for distributing and supplying the hydraulic oil filtered by the oil filter to the hydraulic pump. A chamber is formed.
The hydraulic oil suction passage and the hydraulic oil distribution chamber are formed in the case body independently of each other, and the outlet of the hydraulic oil suction passage to the oil filter and from the oil filter to the hydraulic oil distribution chamber are formed. The entrance and the concentric section are formed substantially concentrically.

  According to the present invention, since the hydraulic pump mounting portion and the oil filter mounting portion are formed in the case body, the hydraulic pump and the oil filter can be assembled and integrated with the case main body, and the hydraulic pump and the oil filter are connected. Since the hydraulic piping to be installed can also be incorporated, it is only necessary to attach the case body to the transmission case. As described above, according to the present invention, the hydraulic oil suction supply path, the pump mounting portion, and the filter mounting portion of the hydraulic pump mounting device of the tractor are integrated and formed in one case body, and the whole is modularized as one unit. As a result, the number of assembly steps can be reduced.

As shown in FIGS. 1, 2A and 2B, the tractor hydraulic pump mounting device according to the present invention is concentrated in a case body 2 fastened and fixed to a side surface of a tractor transmission case 1 with a bolt.
As shown in FIGS. 3 to 7, the case main body 2 has a substantially rectangular frame-shaped mounting flange portion 3 that is attached in close contact with the side surface of the mission case 1 and protrudes toward the mission case side. A substantially rectangular opening 4 communicating with the inside of the transmission case 1 is formed in a frame surrounded by the mounting flange portion 3.

Then, hydraulic pump mounting portions 7 and 8 are provided on the outer surfaces of the front and rear side wall surfaces 5 and 6 on the side opposite to the transmission case from the opening 4. A plurality of hydraulic pumps are attached to the pair of front and rear hydraulic pump mounting portions 7 and 8 in a state of being opposed to each other in the front and rear sides. In this embodiment, as shown in FIGS. The case where three hydraulic pumps 9, 10 and 11 for power steering, front loader and backhoe are attached is illustrated.
The both side wall surfaces 5 and 6 are extended below the pump mounting portions 7 and 8, and a pair of front and rear for attaching the oil filters 12 and 13 to the front and rear both sides on the front and rear outer surfaces of the extended portion in a facing state. Oil filter mounting portions 14 and 15 are formed (see FIG. 2A).

As shown in FIG. 7, the periphery of the case body 2 excluding the opening 4 is surrounded by a peripheral wall 2 a, and the peripheral wall 2 a is formed integrally with the front and rear side walls 5 and 6. As a result, the inside of the case body 2 is a closed vacant room whose periphery is closed, and is configured to communicate with the inside of the mission case 1 through the opening 4.
The upper side surfaces of the case body 2 are hydraulic pump mounting portions 7 and 8, and the lower side surfaces of the case body 2 are oil filter mounting portions 14 and 15. Further, as shown in FIG. 1, the vacant chamber in the case body 2 has an upper portion serving as a housing portion for the power transmission mechanism 37 in the transmission case 1 and a lower portion from the middle portion to the hydraulic oil suction passage 16 and the hydraulic oil distribution chamber. 17 and a partition wall 18.

As shown in FIGS. 1, 2 (A) and 7, the hydraulic oil suction passage 16 includes an oil filter 12 attached to the oil filter attachment parts 14, 15 from the opening 4 in the case body 2, 13 is a passage through which hydraulic oil is drawn.
The hydraulic oil distribution chamber 17 distributes and supplies the hydraulic oil filtered by the oil filters 14 and 15 to the hydraulic pumps 9, 10 and 11 on both sides in the case body 2.
As shown in FIGS. 3 and 4, outlets 19, 20 to the oil filters 12, 13 are provided on both side surfaces of the lower part of the hydraulic oil suction passage 16, on the front and rear side walls of the case body 2 in the oil filter mounting portions 14, 15. 5 and 6 are formed in a circular arc shape.

  Further, as shown in FIGS. 3, 4 and 7, circular inlets 21 and 22 for receiving the hydraulic oil filtered by the oil filters 12 and 13 are formed on both side surfaces of the lower part of the hydraulic oil distribution chamber 17. The arcuate outlets 19 and 20 are concentrically formed at the center of the arcuate outlets 19 and 20 via annular flanges 23 and 24. Further, outlets 25 and 26 for sending hydraulic oil to the hydraulic pumps 9, 10, 11 on the front and rear sides are located at different positions of the front and rear side walls 5, 6 of the case body 2 on the upper side surfaces of the hydraulic oil distribution chamber 17. It is formed to penetrate through. The positions where the outlets 25 and 26 are formed are positions corresponding to intermediate portions between the hydraulic pump mounting portions 7 and 8 and the oil filter mounting portions 14 and 15.

The oil filters 12 and 13 are formed so that a filter element is loaded in a cylindrical case, and is partitioned so as to receive the hydraulic oil from the outer peripheral annular portion at one end and to send the filtered hydraulic oil from the central portion of the same end portion. Is used.
The oil filters 12 and 13 having the above configuration are bolted to the oil filter mounting portions 14 and 15 of the case body 2 with the end portions interposed with seal packing or the like. As shown in FIGS. 3 and 4, the annular flange portions 14 a and 15 a are formed in the oil filter mounting portions 14 and 15, and the annular flange portions 23 and 24 are formed concentrically on the inside. . The arc-shaped outlets 19 and 20 are formed between the inner and outer annular flange portions 14a and 23 and 15a and 24, and the circular inlet ports 21 and 22 are formed in the inner annular flange portions 23 and 24. ing. As a result, the case body 2 and the oil filters 12 and 13 are configured such that the external oil is not required and hydraulic oil can be circulated.

The outlets 25, 26 of the hydraulic oil distribution chamber 17 and the hydraulic pumps 9, 10, 11 are connected by external pipes 27, 28 as shown in FIG. It is assumed to be short, and is integrally assembled with the case main body 2 together with the hydraulic pumps 9, 10, 11 in advance.
The hydraulic pumps 9, 10, 11 are single on the one hand, but have a double structure on the other hand, so that the opening area of the outlets 25, 26 of the hydraulic oil distribution chamber 17 is on the double side. Almost doubled.

  As shown in FIGS. 2A and 2B, the hydraulic pumps 9, 10, 11 on both sides are connected to the pump mounting shafts 29, 30 on the pump mounting portions 7, 8 on the upper side surfaces of the case body 2. It is mounted facing the line. A pump drive gear 31 is attached to the drive shafts 29 and 30. This pump drive gear 31 is meshed with a drive source gear 34 mounted on a PTO shaft 33 in the transmission case 1 via an idle gear 32. As shown in FIGS. 1, 2 (A) and 2 (B) and FIG. 9, the idle gear 32 is integrally extended from both side surfaces in the opening 4 of the case body 2 toward the transmission case 1. The support bracket portions 35 and 36 are rotatably supported in parallel with the pump drive shafts 29 and 30. The idle gear 32 and the pump drive gear 31 constitute a power transmission mechanism 37 for driving the hydraulic pumps 9, 10, 11 from the PTO shaft 33 in the mission case 1 as shown in FIG.

The embodiment of the present invention has the above configuration, and the operation will be described next.
The PTO shaft 33 in the mission case 1 is driven by driving force extracted from the output shaft of a tractor engine (not shown) via a power take-off mechanism (not shown).
The pump drive shafts 29 and 30 are rotationally driven from the drive source gear 34 of the PTO shaft 33 through the idle gear 32 and the pump drive gear 31, thereby driving the hydraulic pumps 9, 10 and 11. The hydraulic pumps 9, 10, 11 are constituted by gear pumps, for example, and suck the hydraulic oil accommodated in the transmission case 1 into the hydraulic oil suction passage 16 from the opening 4 of the case body 2, and the oil filter mounting portion 14. , 15 are flown out from the arc-shaped outlets 19 and 20 toward the oil filters 12 and 13, filtered through the filter elements filled in the oil filters 12 and 13, and then circular at the center. From the inlets 21 and 22 to the hydraulic oil distribution chamber 17 and from the outlets 25 and 26 of the hydraulic oil distribution chamber 17 to the suction ports of the hydraulic pumps 9, 10 and 11 via the external pipes 27 and 28. Suction is performed, and separate hydraulic circuits from the discharge ports of the hydraulic pumps 9, 10, 11, for example, hydraulic circuits for power steering, front loader, and backhoe, respectively. It is sent towards.

FIG. 10 shows a schematic side view of a tractor loader backhoe to which the present invention is applied. In the tractor / loader / backhoe 40, a front loader 42 is attached to the front part of the vehicle body of the tractor 41, and a backhoe 43 is attached to the rear part of the vehicle body.
The front loader 42 is pivotally attached to a main frame 45 that is detachably mounted on the support frame 44 on both the left and right sides of the front portion of the vehicle body of the tractor 41, and a base end of the front loader 42 that is pivotable about a horizontal axis. The main frame 45 is composed mainly of left and right booms 46 whose tips rotate in the vertical direction, and tip work tools 47 such as buckets pivotally attached to the tips of the booms 46 around a horizontal axis. A boom hydraulic cylinder 48 is attached between the boom 46 and a tip work tool hydraulic cylinder 49 between the boom 46 and the tip work tool 47.

FIGS. 11, 12, and 13A, 13B, and 13C show examples of a structure for attaching hydraulic piping to the boom 46 of the front loader 42. FIG.
As shown in FIGS. 13A and 13B, the left and right booms 46 are formed in a square pipe shape, and both side plates 50 are extended from the bottom plate 51 to the lower surface side to form recesses 52. A hydraulic pipe 53 is accommodated in the recess 52 along the longitudinal direction of the boom 46, and is fixed to the boom 46 by a clamp fitting 54 at an appropriate position.
The horizontal connection of the left and right booms 46 is performed by a round pipe-shaped horizontal connection member 55. The left and right booms 46 and the round pipe-like horizontal connecting member 55 are connected by welding or other appropriate coupling means. As shown in FIG. 13C, a U-shaped cross section 56 is fixed by welding or the like along the lower surface of the round pipe-shaped horizontal connecting member 55, and the hydraulic pipe 53 is connected along the U-shaped cross section 56. It is arranged in the lateral direction. The hydraulic pipe 53 is fixed in parallel to the horizontal connecting member 55 through a U-shaped cross section plate 56 by a clamp fitting 57 at an appropriate position.

  There are four hydraulic pipes 53 in total (two connected to the boom hydraulic cylinder 48 and two connected to the tip working tool hydraulic cylinder 49). 11, 12, and 13 (A) and (B), two pieces are overlapped and arranged in two rows from the base portion (right end portion in FIG. 11) toward the distal end side. At the position of the connecting member 55, four are deployed and arranged toward the other boom 46, and only two are arranged on the other boom 46 toward the base side. Two of the four hydraulic pipes 53 are connected to the left and right end working tool hydraulic cylinders 49 via hydraulic hoses at positions near the both ends of the horizontal connecting member 55, and the remaining two hydraulic pipes 53 are The boom cylinders 48 on both sides are connected to the boom hydraulic cylinders 48 on the left and right sides via hydraulic hoses at positions before and after the booms 46 on both sides. The four hydraulic pipes 53 are connected to a hydraulic circuit of a hydraulic pump for a front loader, and a controller is interposed in the hydraulic circuit. By operating this controller, the boom 46 is moved up and down and the tip work is performed. The vertical movement of the tool 47 is performed via the hydraulic cylinders 48 and 49, respectively. The controller is installed near the driver seat of the tractor 41 shown in FIG.

Note that hydraulic oil is supplied to the power steering hydraulic circuit of the tractor 41 from a hydraulic pump for power steering, and the bonnet 60 is operated in association with the operation of the steering handle 59 installed in the driver seat of the tractor 41. The front wheel 61 of the tractor 41 is operated via a controller (not shown) installed inside. Further, hydraulic oil is supplied to the hydraulic circuit of the backhoe 43 from a backhoe hydraulic pump, and an operation such as excavation is performed by a controller 62 installed in the driver's seat of the tractor 41.
In addition, this invention can be freely changed and implemented within the range described in the claim, without being restrict | limited to the above embodiment. For example, the number of installed hydraulic pumps may be two or four or more, and the pump mounting portion and the filter mounting portion may be arranged side by side in the horizontal direction. Furthermore, the filter may be attached to only one side. Further, the present invention can be applied to traveling vehicles other than tractors.

The principal part vertical side view which shows embodiment of this invention apparatus. (A) is a front view of FIG. (B) is a plan view thereof. The right view of a case body. The left view of a case body. The rear view of a case body. The front view of a case body. The longitudinal right side view of a case body. DD sectional drawing of FIG. EE sectional drawing of FIG. The schematic side view of a tractor loader backhoe. The bottom view of the boom of a front loader. The side view of the boom of a front loader. (A), (B), and (C) are AA, BB, and CC expanded sectional views of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmission case 2 Case main body 4 Opening part 7, 8 Hydraulic pump attachment part 9, 10, 11 Hydraulic pump 12, 13 Oil filter 14, 15 Oil filter attachment part 16 Hydraulic oil intake passage 17 Hydraulic oil distribution chamber 18 Partition wall 19, DESCRIPTION OF SYMBOLS 20 Outlet to filter 21, 22 Inlet to hydraulic oil distribution chamber 25, 26 Outlet from hydraulic oil distribution chamber 27, 28 External piping 29, 30 Pump drive shaft 31 Pump drive gear 32 Idle gear 33 PTO shaft 34 Drive source gear 37 Power transmission mechanism

Claims (5)

  A case main body is provided on the outer surface of the mission case, and a hydraulic pump mounting portion for attaching a hydraulic pump driven by power transmitted from a power transmission mechanism in the mission case to the case main body, and hydraulic oil in the mission case A hydraulic pump mounting device for a traveling vehicle, comprising: an oil filter mounting portion for mounting an oil filter for filtering and sucking oil into a hydraulic pump.   The hydraulic pump mounting portion is formed in a state of being opposed to the case body so that the hydraulic pump can be mounted in a facing manner, and a power transmission mechanism for driving the hydraulic pump to be transmitted from the power transmission mechanism in the transmission case therebetween. The hydraulic pump mounting device for a traveling vehicle according to claim 1, wherein:   The hydraulic pump mounting device for a traveling vehicle according to claim 1 or 2, wherein the oil filter mounting portion is formed facing the case body so that the oil filter can be mounted in a facing manner.   The case body includes a hydraulic oil suction passage for sucking hydraulic oil in the transmission case toward the oil filter, and a hydraulic oil distribution chamber for distributing and supplying hydraulic oil filtered by the oil filter to the hydraulic pump. The hydraulic pump mounting device for a traveling vehicle according to any one of claims 1 to 3, wherein   The hydraulic oil suction passage and the hydraulic oil distribution chamber are formed independently in the case body, and an outlet of the hydraulic oil suction passage to the oil filter and an inlet from the oil filter to the hydraulic oil distribution chamber are provided. 5. The hydraulic pump mounting device for a traveling vehicle according to claim 4, wherein each is formed in a substantially concentric section.

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