JP2018053999A - HMT structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a working efficiency of an assembly work and an output adjustment work for HMT.SOLUTION: HMT structure of this invention comprises HST including a pump unit and a motor unit and a planetary unit including a planetary housing that can be fixed to or removed from a prescribed fixing location. The motor housing of the motor unit can be fixed to or removed from the planetary housing. The planetary housing is provided with a constant speed input part for inputting a rotating power force from a driving source under a state in which it is installed at the prescribed fixing location to perform operation transmittance to the constant speed input element; a variable input part for engaging and releasing a power transmittance from a motor shaft to the variable input element in response to a fixing or removal of the motor housing in respect to the planetary housing; and a composite output part for engaging and releasing a power transmittance from the composite output element to the prescribed driving member in response to the fixing or removal of the planetary housing to the prescribed fixing location.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a hydrostatic / mechanical continuously variable transmission structure (HMT structure) having a hydrostatic continuously variable transmission mechanism (HST) and a planetary gear mechanism.

  For the purpose of improving transmission efficiency as much as possible while allowing a continuously variable start from zero initial speed, an HMT structure that combines HST and a planetary gear mechanism is used in the traveling system transmission path of a work vehicle such as a combine or tractor. ing.

  An HMT structure has also been proposed in which the rotation direction of the combined rotational power output from the planetary gear mechanism can be switched between forward and reverse in accordance with the operation of the volume changing member in the HST (see Patent Document 1 below).

  The HMT structure in which the rotation direction of the combined rotational power can be switched between forward and reverse can allow the vehicle to travel forward and backward by operating the volume changing member without providing a forward / reverse switching mechanism in the traveling system transmission path. Useful in that it can.

  However, in the HMT structure described in Patent Document 1, the planetary gear mechanism is housed in the transmission case together with the auxiliary transmission mechanism, while the HST is connected to the outer wall surface of the transmission case.

  In such a configuration, the HMT output adjustment work cannot be performed unless the planetary gear mechanism is incorporated in the mission case and the HST is mounted on the mission case, and the assembly work efficiency including the adjustment work is poor. There's a problem.

  In particular, the HMT described in Patent Document 1 is capable of switching the rotation direction of the combined rotational power between forward and reverse, and in such a configuration, adjustment work of a volume changing member such as a movable swash plate in HST, and Therefore, it is necessary to strictly adjust the meshing of the planetary gear mechanism.

  Specifically, the HMT structure described in Patent Document 1 includes a pump-side movable swash plate and a motor-side movable swash plate as HST volume changing members, and the motor-side movable swash plate is set to the first tilt position. In this state, the pump-side movable swash plate is swung from the reverse rotation direction maximum tilt position through the neutral position to the forward rotation direction maximum tilt position, so that the combined rotational power is reduced from zero to the forward maximum speed. The motor-side movable swash plate is moved from the first tilt position to the neutral position with respect to the first tilt position in the state where the step-shift is performed and the pump-side movable swash plate is positioned at the maximum tilt position in the reverse rotation direction. The combined rotational power is continuously variable from zero to the highest speed in the reverse direction by swinging to a close second tilt position.

  In such an HMT structure, it is necessary to strictly perform assembly work and adjustment work of the HST and the planetary gear mechanism so that the combined rotational power by the HMT structure becomes zero in a predetermined output state where the HST is not neutral.

  However, in the HMT structure described in Patent Document 1, as described above, the output adjustment work cannot be performed unless the planetary gear mechanism is assembled in the mission case and the HST is attached to the mission case. Such adjustment work becomes troublesome.

Japanese Patent No. 4988111

  The present invention has been made in view of the above-described prior art, and has an HMT structure having an HST and a planetary gear mechanism, without actually assembling it to a mounting position of a transmission or the like including an auxiliary transmission mechanism or the like. An object of the present invention is to provide an HMT structure capable of performing assembly work and output adjustment work.

  In order to achieve the above object, the present invention provides a pump shaft, a hydraulic pump supported by the pump shaft, and a pump housing that accommodates the hydraulic pump and supports the pump shaft in a state in which the pump shaft can be operatively connected to a drive source. A pump unit having a motor shaft, a hydraulic motor supported by the motor shaft, and a motor unit having a motor housing that accommodates the hydraulic motor and supports the motor shaft in a state capable of outputting rotational power to the outside. The hydraulic motor is fluidly driven by the hydraulic pump, and at least one volume of the hydraulic pump and the hydraulic motor can be changed by a volume changing member; a sun gear; a planetary gear meshing with the sun gear; An internal gear meshing with a planetary gear and the planetary gear rotatably supported about an axis, and the planetary gear A planetary gear mechanism including a carrier that rotates around the axis of the sun gear in conjunction with the revolution of the sun gear, and a planetary unit that includes a planetary housing that houses the planetary gear mechanism, The motor housing is detachably attached to the planetary housing, and the planetary housing receives rotational power from a drive source in a state where the planetary housing is attached to the predetermined attachment location. A constant speed input portion that inputs and transmits an operation to a constant speed input element formed by one of the internal gear and the carrier, and acts as a variable input element from the motor shaft in accordance with attachment / detachment of the motor housing to / from the planetary housing. A variable input portion for engaging and releasing power transmission to the sun gear, and the planet There is provided a composite output portion for engaging and releasing the power transmission from the output element formed by the other of the internal gear and the carrier to the predetermined drive member in accordance with the attachment / detachment of the uzing to the predetermined attachment location. An HMT structure is provided.

  The planetary housings are located on one side and the other side in the reference direction along the axial direction of the planetary gear mechanism, and planetary first and second ends that define a planetary space that houses the planetary gear mechanism therebetween. A variable input side opening that allows access to the variable input unit and access to the combined output unit, respectively, on one and the other of the planetary side first and second end walls. A synthetic output side opening is provided.

  While the combined output portion is connected to and released from the predetermined drive member via the combined output side opening in accordance with the attachment and detachment of the planetary first and second end walls to the other predetermined mounting location, The motor shaft is connected to and released from the sun gear through the variable input side opening in accordance with attachment / detachment of the motor housing to one of the planetary first and second end walls.

  Preferably, the variable input side opening and the combined output side opening are arranged coaxially.

The planetary first end wall or the planetary second end wall is provided with a constant speed input side opening.
The constant speed input unit is configured to input rotational power from the driving source via the constant speed input side opening and transmit the operation to the constant speed input element.

In a 1st form, constant-speed output side opening is provided in the end wall different from the end wall in which the said constant-speed side input side opening was provided among the said planetary side 1st and 2nd end walls.
In this case, the constant speed input unit inputs rotational power from the drive source through the constant speed input side opening and transmits the operation to the constant speed input element, and also through the constant speed output side opening. Output to the outside is possible.

  In the first aspect, preferably, the pump shaft is operatively connected to the constant speed input portion through the constant speed output side opening.

  In the second embodiment, the pump shaft and the constant speed input unit are operatively connected in parallel to the drive source.

  In the second embodiment, preferably, the motor housing includes a connection side end wall connected in contact with the planetary housing and a free end side end wall located on the opposite side of the planetary housing with respect to a reference direction. The pump housing is coupled to a free end side end wall of the motor housing.

The motor housing has a motor side peripheral wall extending in the axial direction of the motor shaft in a state surrounding the hydraulic motor, and a motor side end wall closing one side of the motor side peripheral wall in the axial direction. A motor-side housing body whose other side in the axial direction is an opening that allows insertion of the hydraulic motor, and a motor-side port block that is detachably attached to the motor-side housing body so as to close the opening, The pump housing has a pump side peripheral wall extending in the axial direction of the pump shaft in a state of surrounding the hydraulic pump, and a pump side end wall closing one axial direction side of the pump side peripheral wall. A pump-side housing body whose other axial side is an opening that allows the hydraulic pump to be inserted; and the pump that closes the opening. It is to have a pump-side port block which is detachably attached to the housing body.
More preferably, the motor side end wall of the motor side housing body acts as the connection side end wall, the motor side port block acts as the free end side end wall, and the motor side port block and the pump side port A block is formed by a single common port block.

  In the HMT structure according to the present invention, preferably, the combined rotational power output from the output element is continuously variable between the highest speed in the reverse direction and the highest speed in the forward direction by operating the volume changing member. .

  According to the HMT structure of the present invention, the HST includes a pump unit and a motor unit that can be set apart from each other, and a planetary unit including a planetary housing that can be attached to and detached from a predetermined mounting location. The planetary housing can be attached to and detached from the planetary housing. The planetary housing receives rotational power from a driving source in a state where the planetary housing is attached to a predetermined mounting location, and operates to a constant speed input element of the planetary gear mechanism in the planetary unit. A constant speed input section for transmitting, and a variable input section for engaging and releasing power transmission from a motor shaft in the motor unit to a variable input element of the planetary gear mechanism in accordance with the attachment / detachment of the motor housing to / from the planetary housing. The planetary gear mechanism can be combined according to attachment / detachment of the planetary housing to / from a predetermined attachment location. Since a combined output unit for engaging and releasing power transmission from the element to the predetermined drive member is provided, the pump unit, the motor unit, and the planetary unit are not actually attached to an attachment location such as a transmission. , HMT assembly work and output adjustment work can be performed, and the work efficiency can be improved.

FIG. 1 is a developed cross-sectional view of a state in which the HMT structure according to Embodiment 1 of the present invention is mounted on a transmission. FIG. 2 is a partially enlarged view of FIG. FIG. 3 is an exploded view of FIG. 4 is a cross-sectional view of the HMT structure taken along line IV-IV in FIG. FIG. 5 is an enlarged cross-sectional view of the planetary gear mechanism in the HMT structure. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is an exploded sectional view of the planetary gear mechanism. FIG. 9 is a developed cross-sectional view of a state in which the HMT structure according to Embodiment 2 of the present invention is attached to the transmission. FIG. 10 is a partially enlarged view of FIG. FIG. 11 is an exploded view of FIG. 12 is a view taken in the direction of arrow XII in FIG. FIG. 13 is a developed cross-sectional view of a state in which the HMT structure according to Embodiment 3 of the present invention is mounted on a transmission. FIG. 14 is a transmission schematic diagram of a working vehicle to which the HMT structure 3 according to the third embodiment is applied.

Embodiment 1
Hereinafter, an embodiment of an HMT structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a developed cross-sectional view of a state in which the HMT structure 1 according to the present embodiment is mounted on a transmission 500.
2 is an enlarged view of FIG. 1, and FIG. 3 is an exploded view of FIG.
FIG. 4 is a cross-sectional view of the HMT structure 1 taken along line IV-IV in FIG.

  As shown in FIGS. 1 to 3, the HMT structure 1 includes an HST 10 including a pump unit 20 and a motor unit 50, and a planetary unit 100 that can be independently installed.

  The pump unit 20 accommodates the pump shaft 21, a hydraulic pump 25 supported on the pump shaft 21 so as not to rotate relative to the pump shaft 21, and the hydraulic pump 25. The pump unit 20 can be operably connected to the drive source. And a pump housing 30 that is supported so as to be rotatable about an axis.

  The pump housing 30 has a peripheral wall 36 extending in the axial direction of the pump shaft 21 in a state of surrounding the hydraulic pump 25 and an end wall 38 that closes one axial direction side of the peripheral wall 36. A pump-side housing body 35 whose other side in the direction is an opening that allows the hydraulic pump 25 to be inserted, and a pump-side port block 40 that is detachably attached to the pump-side housing body 35 so as to close the opening. I have.

  The pump shaft 21 is rotated about its axis by the end wall 38 and the pump-side port block 40 in a state in which rotational power operatively transmitted from the driving source can be input to one end 21a forming an input end. It is supported freely.

  The motor unit 50 accommodates the motor shaft 51, the hydraulic motor 55 supported on the motor shaft 51 so as not to rotate relative to the motor shaft 51, and can output rotational power from the motor shaft 51 to the outside. And a motor housing 60 that supports the motor shaft 51 so as to be rotatable about its axis.

The motor housing 60 is separate from the pump housing 30.
The motor housing 60 includes a peripheral wall 66 that extends in the axial direction of the motor shaft 51 in a state of surrounding the hydraulic motor 55, and an end wall 68 that closes one axial direction of the peripheral wall 66. A motor-side housing body 65 whose other side in the direction is an opening that allows the hydraulic motor 55 to pass therethrough, and a motor-side port block 70 that is detachably attached to the motor-side housing body 65 so as to close the opening. I have.

  The hydraulic motor 55 accommodated in the motor housing 60 is fluidly driven by the hydraulic pump 25 while being separated from the hydraulic pump 25 accommodated in the pump housing 30. Is fluidly connected.

  Specifically, the HST 1 has a pair of hydraulic oil lines 80 that fluidly connect the hydraulic pump 25 and the hydraulic motor 55.

  In the present embodiment, the pair of hydraulic oil lines 80 are fluidly connected at one end to the hydraulic pump 25 and opened at the outer surface of the pump housing 30 (the pump-side port block 40) at the other end. A pair of pump side hydraulic oil passages 81 formed in the pump housing 30 (the pump side port block 40) so as to form a pump side hydraulic oil port, and one end side of which is fluidly connected to the hydraulic motor 55 and the other end. A pair of motor housing 60 (the motor-side port block 70) formed on the outer side of the motor housing 60 (the motor-side port block 70) to form a pair of motor-side hydraulic oil ports. The motor side hydraulic oil path 83 flows through the pair of pump side hydraulic oil ports and the pair of motor side hydraulic oil ports. And a pair of hydraulic fluid pipes 85 to be connected (see below Figure 12).

  The HST 10 further changes the volume of at least one of the hydraulic pump 25 and the hydraulic motor 55 so that the output rotational speed output from the motor shaft 51 with respect to the input rotational speed input to the pump shaft 21 is increased. A volume changing member 90 that continuously changes the ratio (that is, the gear ratio by the HST 10) is provided.

  In the present embodiment, as shown in FIGS. 1 to 3, the volume changing member 90 includes a pump-side movable swash plate 90 (P) that changes the volume (supply / discharge oil amount) of the hydraulic pump 25, and A motor-side movable swash plate 90 (M) for changing the volume (supply / discharge oil amount) of the hydraulic motor 55 is provided.

As shown in FIGS. 1 to 4, the planetary unit 100 includes a planetary gear mechanism 101 and a planetary housing 200 that houses the planetary gear mechanism 101.
FIG. 5 shows an enlarged cross-sectional view of the planetary gear mechanism 101.
6 is a cross-sectional view taken along line VI-VI in FIG. 5, and FIG. 7 is a cross-sectional view taken along line VII-VII in FIG.

  As shown in FIG. 5 and the like, the planetary gear mechanism 101 includes a sun gear 110, a planetary gear 120 that meshes with the sun gear 110, an internal gear 130 that meshes with the planetary gear 120, and the planetary gear 120 around its axis. And a carrier 150 that rotatably supports and rotates about the axis of the sun gear 110 in conjunction with the revolution of the planetary gear 120 around the sun gear 110.

  In the planetary gear mechanism 101, one of the three planetary elements of the sun gear 110, the carrier 150, and the internal gear 130 acts as a variable input element, and the other element acts as a constant input element. The remaining one element acts as a combined rotational power output element.

  In the present embodiment, the sun gear 110 acts as a variable input element that inputs variable rotational power from the motor shaft 51, and the internal gear 130 is operatively driven by the constant speed rotational power (reference rotational speed) from the drive source. The carrier 150 functions as a combined rotational power output element that outputs combined rotational power.

  As shown in FIG. 5, in the present embodiment, the carrier 150 includes a carrier pin 160 that supports the planetary gear 120 so as to be rotatable about an axis, and the revolution of the planetary gear 120 around the sun gear 110 together with the sun gear. A first end and a second end supporting the first end 162 (1) on one side in the axial direction and the second end 162 (2) on the other side in the axial direction of the carrier pin 160 so as to rotate around the axis of 110, respectively. It has carrier bodies 170 (1) and 170 (2).

  The first carrier body 170 (1) has a first support hole 172 (1) into which the first end 162 (1) of the carrier pin 160 is inserted, and a first end 162 ( 1) The first stop surface 175 (1) that engages with the first contact surface 165 (1) facing the one side in the axial direction of the carrier pin 160 in a state where the first support hole 172 (1) is inserted. And are provided.

  Meanwhile, the second carrier body 170 (2) has a second support hole 172 (2) into which the second end 162 (2) of the carrier pin 160 is inserted, and a second end of the carrier pin 160. A second stop surface 175 (engaged with a second contact surface 165 (2) facing the other axial direction of the carrier pin 160 with the 162 (2) being inserted into the second support hole 172 (2). 2).

  The first and second carrier bodies 170 (1) and 170 (2) have the first end 162 (1) engaged with the first support hole 172 (1) and the first contact surface 165. (1) is engaged with the first stop surface 175 (1), the second end 162 (2) is engaged with the second support hole 172 (2), and the second contact surface 165 ( 2) are connected to the second stop surface 175 (2) so as to be separable from each other via a fastening member 178.

  According to the planetary gear mechanism 101 having such a configuration, it is possible to effectively reduce the load applied to the carrier pin 160 and the retaining structure of the carrier pin 160, thereby improving the durability.

That is, in the conventional planetary gear mechanism, the carrier pin is in a cantilever support state in which the one side in the axial direction is inserted and supported in the support hole formed in the carrier body such as the carrier gear, and the planetary gear is supported on the other side in the axial direction. It is said that.
In such a conventional configuration, a large load is applied to the carrier pin itself.

  In the conventional planetary gear mechanism, the carrier pin is generally prevented from coming out of the support hole by a retaining pin that is detachably attached to the carrier pin. A large load is applied in the shear direction.

On the other hand, in the present embodiment, the carrier pin 160 has the first and second ends 162 (1) and 162 (2) having the first support holes 172 of the first carrier body 170 (1). (1) and in the both-end support state inserted into the second support hole 172 (2) of the second carrier body 170 (2), the first and second ends 162 (1), 162 (2) The planetary gear 120 is supported at an intermediate portion therebetween.
Therefore, the load applied to the carrier pin 160 can be effectively reduced.

Further, in the present embodiment, the first contact surface 165 (1) contacts the first stop surface 175 (1), thereby preventing the carrier pin 160 from coming off to one side in the axial direction. In addition, the second contact surface 165 (2) is in contact with the second stop surface 175 (2), thereby preventing the carrier pin 160 from coming off to the other side in the axial direction.
Therefore, the carrier pin 160 can be prevented from coming off without imposing an excessive load on a specific member such as the retaining pin.

FIG. 8 is an exploded sectional view of the planetary gear mechanism 101.
In the present embodiment, as shown in FIG. 8, the first support hole 172 (1) has an axially inner end adjacent to the second carrier body 170 (2) on the second carrier body 170 (2). ) To the surface 170a (1) opposite to the second carrier body 170 (2), and the axially outer end side opposite to the second carrier body 170 (2) terminates within the axial thickness of the first carrier body 170 (1). Part 173 (1) and a bottom face 174 (1) extending radially inward from the axially outer end side of the hole 173 (1).

  Similarly, the second support hole 172 (2) has an axially inner end that is close to the first carrier body 170 (1) and is open to a surface 170a (2) facing the first carrier body 170 (1). And a hole 173 (2) whose outer end in the axial direction opposite to the first carrier body 170 (1) ends within the axial thickness of the second carrier body 170 (2), and the hole 173. A bottom surface 174 (2) extending radially inward from the axially outer end side of (2).

  The first end 162 (1) of the carrier pin 160 is arranged such that the end surface 164 (1) on one axial side is in contact with the bottom 174 (1) of the first support hole 172 (1). The second end 162 (2) of the carrier pin 160 is inserted into the hole 173 (1) of the first support hole 172 (1), and the end surface 164 (2) on the other side in the axial direction is the second end 164 (2). The second support hole 172 (2) is inserted into the hole 173 (2) so as to be in contact with the bottom surface 174 (2) of the support hole 172 (2).

  That is, in the present embodiment, the end surfaces 164 (1) and 164 (2) on one side and the other side in the axial direction of the carrier pin 160 are the first and second contact surfaces 165 (1) and 165, respectively. 165 (2), and the bottom surfaces 174 (1) and 174 (2) of the first and second support holes 172 (1) and 172 (2) are respectively connected to the first and second stop surfaces 175 ( 1) Acts as 175 (2).

The planetary gear mechanism 101 is provided with the following lubricating oil supply structure.
As shown in FIGS. 5 to 8, the first carrier body 170 (1) extends from the radially inner end of the bottom surface 174 (1) of the first support hole 172 (1) to the outer axial end side. A first oil hole 176 (1) is provided in the back surface 170b (1) of the first carrier body 170 (1) opposite to the second carrier body 170 (2).

  Similarly, the second carrier body 170 (2) extends from the radially inner end of the bottom surface 174 (2) of the second support hole 172 (2) to the axially outer end side to extend to the second carrier body 170. A second oil hole 176 (2) is provided in the back surface 170b (2) opposite to the first carrier body 170 (1) of (2).

  By providing the first and second oil holes 176 (1) and 176 (2), the oil stored in the portion of the housing 200 that houses the planetary gear mechanism 101 can be stored in the carrier pin 160. The first and second ends 162 (1) and 162 (2) can be effectively guided.

Further, in the planetary gear mechanism 101, the carrier pin 160 opens to the end surface 164 (1) on one axial side so as to face the first oil hole 176 (1) and the second oil hole 176 (2 ) Is provided on the other end surface 164 (2) on the other side in the axial direction, and a lubricating oil hole 166 is also provided in the outer peripheral surface of the region supporting the planetary gear 120.
By providing the lubricating oil hole 166, the lubricating oil can be effectively guided to the entire planetary gear mechanism 101.

Further, in the planetary gear mechanism 101, the following configuration is adopted in order to smoothly supply the lubricating oil to the entire planetary gear mechanism 101.
That is, as shown in FIGS. 5 to 8, the lubricating oil hole 166 includes an axial hole 166a that opens on the end surfaces 164 (1) and 164 (2) on one axial side and the other axial side, and the axial hole 166a. One end side and the other end side in a state of being communicated with each other include a radial hole 166b that opens to the outer peripheral surface.

  The carrier pin 160 has the first and second carrier bodies 170 (1) such that the radial hole 166b is held in a posture along the radial direction R with respect to the rotation center of the sun gear 110. , 170 (2) is fixed so as not to rotate about the axis.

  In the present embodiment, as shown in FIGS. 5 to 8, the carrier pin 160 is provided with a non-rotating pin 168 extending in the radial direction, and the first carrier body 170 (1) The non-rotating pin 168 is engaged with the holding groove 171 formed on the surface (the surface 170a (1) facing the second carrier body 170 (2)), so that the radial hole 166b becomes the planetary gear. In the state along the radial direction R of the mechanism, rotation of the carrier pin 160 around the axis is prevented.

  By providing such a configuration, the lubricating oil introduced into the axial hole 166a during the rotational operation of the carrier 150 is distributed along the entire radial direction of the planetary gear mechanism 101 through the radial hole 166b. It can be diffused smoothly.

  As described above, the carrier pin 160 is prevented from coming off in the thrust direction by engaging the first contact surface 165 (1) and the first stop surface 175 (1) and the second contact. Since the rotation is performed by the engagement of the surface 165 (2) and the second stop surface 175 (2), the anti-rotation pin 168 is not required to be strong enough to prevent the carrier pin 160 from coming off. Only a strength that can prevent rotation of the pin 160 around the axis is sufficient.

  The planetary housing 200 that houses the planetary gear mechanism 101 has a constant speed input unit 250 that receives rotational power that is operatively transmitted from the drive source and transmits the rotational power to a constant speed input element, and the motor shaft 51. Are provided with a variable input unit 270 that transmits the rotational power from the variable input element to the variable input element, and a combined output unit 280 that outputs the combined rotational power to the outside.

  The planetary housing 200 is configured to be detachably connected to a predetermined attachment location such as the mission case 510, and the constant speed input unit 250 is in a state where the planetary housing 200 is attached to the predetermined attachment location. The reference rotational power from the drive source can be input.

  In the present embodiment, the planetary housing 200 is located on one side and the other side with respect to a reference direction that is the axial direction of the planetary gear mechanism 101, and a planetary space 200S that accommodates the planetary gear mechanism 101 therebetween. The planetary side first and second end walls 200 (1) and 200 (2) that define the edge of the planetary side first and second end walls 200 (1) and 200 (2) are connected to each other. And a planetary peripheral wall 205 extending in the direction.

  The planetary housing 200 is detachably connected to the mission case 510 in a state where a part of the outer surface of the planetary second end wall 200 (2) is in contact with the outer surface of the mission case 510.

  That is, in the present embodiment, as shown in FIGS. 1 to 3, the planetary housing 200 forms a superposition region in which part of the planetary housing 200 overlaps with the mission case 510 when viewed along the reference direction. In addition, in a state where the remaining part is disposed with respect to the mission case 510 so as to form an extended region that does not overlap with the mission case 510, the mission case 510 is detachably connected to the mission case 510 by a fastening member such as a bolt. ing.

  In the present embodiment, as shown in FIGS. 1 and 2, the planetary housing 200 has planetary first and second lid members 210 and 220 that are detachably connected to each other.

The planetary first lid member 210 includes a first end wall 211 and a first peripheral wall 215 extending along the reference direction from the periphery of the first end wall 211.
The planetary second lid member 220 includes a second end wall 221 and a second peripheral wall 225 extending from the periphery of the second end wall 221 along the reference direction.

The planetary first and second lid members 210 and 220 are detachably connected with the end surfaces of the first and second peripheral walls 221 and 225 in contact with each other.
In such a configuration, the first and second end walls 211 and 221 form the planetary first and second end walls 200 (1) and 200 (2), and the first and second peripheral walls 215 and 225 are formed. Forms the planetary peripheral wall 205.

  As shown in FIGS. 2 and 3, one of the planetary first and second end walls 200 (1) and 200 (2) (in the present embodiment, the planetary first end wall 200 (1)). Is provided with a constant speed input side opening 255, and the constant speed input unit 250 inputs rotational power from the driving source through the constant speed input side opening 255, and the constant speed input is performed. It is configured to transmit to the element (in the present embodiment, the internal gear 130).

  Specifically, the constant speed input unit 250 is disposed coaxially with the constant speed input side opening 255 and has one end side accessible from the outside through the constant speed input side opening 255. A constant speed input shaft 251 supported rotatably around the axis on the first and second end walls 200 (1) and 200 (2) and the constant speed input shaft 251 so as to mesh with the constant speed input element. Transmission gear 252.

  In the present embodiment, the constant speed input shaft 251 is supported on the planetary first end wall 200 (1) via a bearing member 400 having one end side disposed in the constant speed input side opening 255, In addition, the other end side is supported by the planetary second end wall 200 (2) via the bearing member 405.

In the present embodiment, the constant-speed input shaft 251 is formed with an axial hole that opens to an end face on one end side, and a spline is provided on the inner peripheral surface of the axial hole.
A constant speed transmission shaft 450 that operatively inputs rotational power from the drive source is splined to one end side of the constant speed input shaft 251 through the constant speed input side opening 255.

  The drive source to the constant speed transmission shaft 450 includes, for example, a drive pulley (not shown) operatively connected to the drive source, and a constant speed supported by the constant speed transmission shaft 450 so as not to be relatively rotatable. Rotational power is transmitted through a pulley transmission mechanism 460 including a transmission pulley 461 and a transmission belt 465 wound around the drive pulley and the constant speed transmission pulley 461.

  In the present embodiment, as shown in FIGS. 1 to 3, the other of the planetary first and second end walls 200 (1) and 200 (2) (the planetary second in the present embodiment). The end wall 200 (2) is provided with a constant speed output side opening 265 coaxially with the constant speed input side opening 255.

  The constant speed input unit 250 transmits the rotational power input from the driving source via the constant speed input side opening 255 to the constant speed input element and transmits the rotational power via the constant speed output side opening 265. And can be output to the outside.

Specifically, the constant speed input unit 250 is accessible from the outside through the constant speed output side opening 265.
In the present embodiment, as shown in FIGS. 1 to 3, the constant speed input section 250 extends from the constant speed input shaft 251 and extends outward through the constant speed output side opening 265. And a constant speed output shaft 253.

  As shown in FIGS. 1 to 3, in the present embodiment, the pump shaft 21 is operatively connected to the constant speed input portion 250 (the constant speed output shaft 253) via the constant speed output side opening 265. Thus, rotational power is operatively input from the drive source.

  Specifically, the mission case 510 is disposed between the mission case side first end wall 511 (1) on one side in the reference direction to which the planetary housing 200 is coupled and the mission case side first end wall with respect to the reference direction. The mission-side second end wall 511 (2) disposed on the other side in the reference direction so as to define the accommodation space, and the periphery of the mission-side first and second end walls 511 (1), 511 (2) A transmission side peripheral wall 515 extending in the reference direction so as to be connected.

  When viewed along the reference direction, the planetary housing 200 has the extension region extending from the mission-side first end wall 511 (1) in a direction perpendicular to the reference direction and the planet-side second end wall 200. The overlapping region in (2) is connected to the mission-side first end wall 511 (1) in a state of being in contact with the mission-side first end wall 511 (1).

On the other hand, a pump mounting flange is provided on the mission side second end wall 511 (2) so as to face the extension region of the planetary housing 200 in a state of being connected to the mission side first end wall 511 (1). 513 is provided.
The pump housing 30 is connected to the pump mounting flange 513 by a fastening member such as a bolt with the input end 21a of the pump shaft 21 extending in a direction close to the planetary housing 200. .

  In such a configuration, the pump shaft 21 is connected to the constant speed input unit 250 (the constant speed output shaft 253) via a pump transmission shaft 490.

  1 to 3, reference numeral 491 is a coupling that connects the constant speed output shaft 253 of the constant speed input unit 250 and the pump transmission shaft 490 so as not to be relatively rotatable. Reference numeral 492 denotes the pump. It is a coupling that connects the transmission shaft 490 and the pump shaft 21 so that they cannot rotate relative to each other.

  The motor housing 60 is connected to the predetermined mounting location (the mission case 510 in the present embodiment) of the planetary first and second end walls 200 (1) and 200 (2) in the planetary housing 200. To the end wall (in this embodiment, the planetary first end wall 200 (1)) opposite to the end wall (in the present embodiment, the planetary second end wall 200 (2)). Removably connected.

  The variable input portion 270 is configured to engage and release power transmission from the motor shaft 51 to the variable input element in accordance with the attachment / detachment of the motor housing 50 to / from the planetary housing 200.

As described above, in the present embodiment, the sun gear 110 acts as a variable input element.
Accordingly, the variable input unit 270 is configured to connect and disconnect the motor shaft 51 directly or indirectly to the sun gear 110 in accordance with the attachment / detachment of the motor housing 60 to / from the planetary housing 200. .

Specifically, the variable input unit 270 has a spline that is not rotatable relative to the sun gear 110 around its axis.
In the present embodiment, the sun gear 110 is provided with an axial hole 110a (see FIG. 5) in the center in the radial direction, and the spline is formed on the inner peripheral surface of the axial hole 110a.

  Further, the planetary first end wall 200 (1) is provided with a variable input side opening 275 coaxially with the variable input part 270, and the outer periphery of the outwardly extending part of the motor shaft 51. A spline connected to the variable input unit 270 by a spline is provided on the surface.

  With this configuration, the motor shaft 51 is connected to and disconnected from the variable input portion 270 in accordance with the attachment / detachment of the motor housing 50 to / from the planetary housing 200.

  The combined output unit 280 is configured to transmit the rotational power of the combined rotational power output element in the planetary gear mechanism 101 to a predetermined drive member.

In the present embodiment, as described above, the carrier 150 functions as a combined rotational power output element.
Accordingly, the combined output unit 280 outputs the rotational power of the carrier 150 toward a predetermined driving member.

  Specifically, the composite output unit 280 is driven in a predetermined manner through a composite output side opening 285 having one end operatively connected to the carrier 150 and the other end formed in the planetary second end wall 200 (2). Rotational power can be output toward the member.

  In the present embodiment, when the planetary housing 200 is mounted on the mission case 510, the combined output unit 280 transmits the combined rotational power to the subtransmission mechanism 530 accommodated in the mission case 510. It has become.

  That is, as shown in FIG. 2, the synthetic output side opening 285 is formed in a region of the planetary second end wall 200 (2) that is in contact with the outer surface of the mission case 510 serving as the predetermined attachment location. Is formed.

  In the present embodiment, the combined output unit 280 has a combined output shaft 281 having one end operatively connected to the carrier 150 and the other end extending outwardly through the combined output side opening 285. Have.

  A spline is provided on the outer peripheral surface of the outwardly extending portion of the combined output shaft 281, and a cylindrical connecting member 530 a to which the outwardly extending portion of the combined output shaft 281 is splined to the transmission case 510. Is arranged.

  With such a configuration, the combined output unit 280 is connected to and disconnected from a predetermined drive member in accordance with the attachment / detachment of the planetary housing 200 with respect to the predetermined attachment location (the mission case 510 in the present embodiment). .

In the present embodiment, the composite output unit 280 is arranged coaxially with the planetary gear mechanism 101, but instead, the composite output unit 280 has a diameter from the axial position of the planetary gear mechanism 101. It is also possible to displace it in the direction.
In this case, the planetary housing 200 is provided with an output side transmission unit that transmits the carrier 150 to the combined output unit 280.

The output side transmission portion is coaxially connected to the carrier 150, and is connected to the carrier 150 so as not to rotate relative to the carrier 150. The output side transmission portion is supported on the output side transmission shaft so as not to rotate relative to the output side first shaft. A transmission gear and an output-side second transmission gear supported by the combined output shaft 281 so as not to rotate relative to the output-side first transmission gear.
According to such a configuration, the rotational power can be transmitted from the output element to the combined output shaft 281 at an increased speed or a reduced speed by changing the pitch diameters of the output side first and second transmission gears.

In the present embodiment, the composite output shaft 281 is detachably connected to the carrier 150 via a spline connection.
Specifically, as shown in FIG. 5, the second carrier body 170 (2) extends in the radial direction with respect to the axis of the planetary gear mechanism 101, and the second end 162 (2) of the carrier pin 160. And a hollow cylindrical portion 185 (2) extending in the axial direction from the radially inner end of the radial extending portion 180 (2).

  A spline is formed on the inner peripheral surface of the cylindrical portion 185 (2), and a spline that meshes with the spline is formed on the outer peripheral surface of the connecting end portion of the combined output shaft 281.

  In the present embodiment, as shown in FIG. 5 and the like, the cylindrical portion 185 (2) of the second carrier main body 170 (2) is inserted through the bearing member 415 provided in the synthetic output side opening 285. The planetary second end wall 200 (2) is supported so as to be rotatable about the axis, and the internal gear 130 is supported to the cylindrical portion 185 (2) via the bearing member 420 so as to be rotatable about the axis. .

The first carrier body 170 (1) also extends in the radial direction with reference to the axis of the planetary gear mechanism 101, and supports the first end 162 (1) of the carrier pin 160 in the radial direction. 180 (1) and a hollow cylindrical portion 185 (1) extending in the axial direction from the radially inner end of the radially extending portion 180 (1).
The cylindrical portion 185 is supported by the planetary first end wall 200 (1) so as to be rotatable about an axis via a bearing member 410 disposed in the variable input side opening 275.

The radially extending portion 180 (1) of the first carrier body 170 (1) has a central opening communicating with the axial hole of the cylindrical portion 185 (1) at the radial center, and the motor The shaft 51 passes through the axial hole of the cylindrical portion 185 (1) and the central opening of the radially extending portion 180 (1) and reaches the other side in the axial direction from the first carrier body 170 (1). Yes.
The other side of the motor shaft 51 in the axial direction is connected to the sun gear 110 through a spline that forms the variable input portion 270.

As shown in FIG. 2 and the like, a bearing member 400 that is disposed in the constant speed input side opening 255 and supports one end side of the constant speed input shaft 251, and is disposed in the variable input side opening 275 and the first. A bearing member 410 for supporting the cylinder portion of the carrier body 170 (1) 185 (1) and the cylinder portion 185 (2) of the second carrier body 170 (2) disposed in the synthetic output side opening 285. The bearing member 415 to be supported has a sealing function.
Further, a seal member 406 is disposed in the constant speed output side opening 265 outside the bearing member 405 that supports the other end side of the constant speed input shaft 253.

With such a configuration, the planetary space 200S is partitioned liquid-tight with respect to the outside, and can store oil.
Note that reference numeral 206 in FIG. 3 denotes the oil level of the oil stored in the planetary space 200S.

  According to the HMT structure 1 according to the present embodiment, the motor unit 50 and the planetary unit without actually mounting the pump unit 20 and the motor unit 50 and the planetary unit 100 forming the HST 10 on a vehicle. The HMT assembly work and adjustment work can be performed simply by connecting 100.

  That is, in the HMT including the HST and the planetary gear mechanism, the constant-speed rotational power is input to the first element among the three elements including the sun gear, the carrier, and the internal gear in the planetary gear mechanism, and the first of the three elements. The continuously variable rotational power output from the HST is input to the two elements, and the combined rotational power is output from the third element among the three elements.

  Therefore, the HST and the planetary gear mechanism are accurately assembled and the output is adjusted so that the operation amount of the HST volume changing member and the rotational speed of the combined rotational power output from the third element of the planetary gear mechanism have a desired relationship. It is necessary to do strictly.

  In this regard, in the conventional HMT, the planetary gear mechanism is accommodated in a transmission case that accommodates the auxiliary transmission mechanism, while the HST is separated from the planetary gear mechanism on the outer wall surface of the mission case. It is connected.

  In such a conventional configuration, the planetary gear mechanism is incorporated in the transmission case, and the HMT cannot be adjusted unless the HST is mounted on the transmission case. There is a problem of inefficiency.

  On the other hand, according to the HMT structure 1 according to the present embodiment, the motor unit 50 can be connected to the planetary unit 100 and the hydraulic pump 25 and the hydraulic motor 55 can be fluidly connected. Assembly work and adjustment work can be performed, and the work efficiency can be improved.

  Further, in the specification in which the combined rotational power of the planetary gear mechanism 101 can be switched between forward and reverse by the output operation of the HST 10, it is necessary to perform the adjustment work more strictly, and the HMT structure 1 according to the present embodiment. The above-described effect, that is, the effect that the assembly work and adjustment work of the HMT can be performed without actually being assembled to the vehicle is particularly effective.

  In the present embodiment, the following configuration enables forward / reverse switching of the combined rotational power of the planetary gear mechanism 101 by an HST output operation.

  That is, in the present embodiment, as described above, the HST 10 includes the pump-side movable swash plate 90 (P) and the motor-side movable swash plate 90 (M) as the volume changing member 90. .

  The pump-side movable swash plate 90 (P) stops the rotation of the motor shaft 51 from the reverse rotation direction maximum tilt position that rotates the motor shaft 51 in the reverse rotation direction maximum speed around the pump side swing axis. The motor shaft 51 is tilted between the maximum tilt positions in the forward rotation direction that rotate the motor shaft 51 at the highest speed in the forward rotation direction across the neutral position.

  The motor-side movable swash plate 90 (M) is tilted between a first tilt position and a second tilt position set to be more neutral than the first tilt position around the motor-side swing axis. It is configured to be able to.

  In such a configuration, the forward rotation direction maximum tilt position and the reverse rotation direction maximum tilt position of the pump side movable swash plate 90 (P), and the first and second tilts of the motor side movable swash plate 90 (M). The position and the gear ratio of the planetary gear mechanism 101 are the maximum in the reverse direction of the pump-side movable swash plate 90 (P) in a state where the motor-side movable swash plate 90 (M) is held at the first tilt position. In response to the tilt from the tilt position to the maximum tilt position in the forward direction, the rotational speed of the combined rotational power output from the planetary gear mechanism 101 is steplessly changed from zero to the maximum speed in the forward direction, and The tilt of the motor-side movable swash plate 90 (M) from the first tilt position to the second tilt position in a state where the pump-side movable swash plate 90 (P) is held at the maximum tilt position in the reverse rotation direction. Accordingly, the rotational speed of the combined rotational power of the planetary gear mechanism 101 is zero. In this way, the rotational speed of the planetary gear mechanism 101 can be switched between the highest speed in the reverse direction and the highest speed in the forward direction. In addition, continuously variable transmission is possible.

  In this configuration, even when the pump-side movable swash plate 90 (P) is positioned at the neutral position and the output of the HST 10 (rotational speed of the motor shaft 51) is zero, the combined rotation of the planetary gear mechanism 101 is performed. The power has a predetermined rotational speed in the forward direction, and the pump-side movable swash plate 90 (P) is at the maximum tilt position in the reverse rotation direction, and the motor-side movable swash plate 90 (M) is at the first tilt position. When the HST 10 is in the predetermined output state, the combined rotational power of the planetary gear mechanism 101 becomes zero and the vehicle is stopped.

  Therefore, it is necessary to perform the assembly and adjustment operations of the HMT more strictly. In such a specification, the HMT structure according to the present embodiment is particularly useful.

  As described above, since the HMT structure 1 according to the present embodiment is capable of forward / reverse switching of the rotation direction of the output rotational power, the transmission 500 to which the HMT structure 1 is applied includes the front and rear. There is no need to provide a decimal shift mechanism.

  As shown in FIGS. 1 and 2, the transmission 500 includes a transmission case 510, and the auxiliary transmission mechanism 530 and the differential transmission mechanism 550 housed in the transmission case 510.

  The auxiliary transmission mechanism 530 performs multi-stage transmission of the rotational power transmitted from the combined output unit 280 through the cylindrical connecting member 530a.

  Specifically, the sub-transmission mechanism 530 includes a sub-transmission drive shaft 531 that is operatively connected to the combined output unit 280 via the cylindrical coupling member 530a, a sub-transmission driven shaft 533, the sub-transmission drive shaft 531 and A plurality of auxiliary transmission gear trains 535 (1) and 535 (2) supported by the auxiliary transmission driven shaft 533 and the plurality of auxiliary transmission gear trains 535 (1) and 535 (2) are selectively transmitted in power. And an auxiliary transmission shifter 537.

  The differential transmission mechanism 550 differentially transmits the rotational power from the auxiliary transmission mechanism 530 to a pair of left and right drive axles 580a and 580b.

  Further, the transmission 500 is selectively and individually selected for each of the parking brake mechanism 560 that can selectively apply a braking force to the driven shaft of the auxiliary transmission mechanism 530 and the pair of left and right drive axles 580a and 580b. It has a pair of left and right traveling brake mechanisms 570a and 570b to which a braking force can be applied.

Embodiment 2
Hereinafter, other embodiments of the HMT structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 9 shows a developed cross-sectional view of the state in which the HMT structure 2 according to the present embodiment is attached to the transmission 500.
10 is an enlarged view of FIG. 9, and FIG. 11 is an exploded view of FIG.
In the figure, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  The HMT structure 2 according to the first embodiment is configured such that the rotational power from the drive source input to the constant speed input unit 250B is not output to the outside. 1 and different.

  Specifically, the HMT structure 2 according to the present embodiment is different from the HMT structure 1 according to the first embodiment in that the planetary unit 100 is changed to a planetary unit 100B.

  The planetary unit 100B is different from the planetary unit 100 in that the constant speed input unit 250 is changed to a constant speed input unit 250B and the planetary housing 200 is changed to a planetary housing 200B. ing.

  As shown in FIGS. 9 to 11, in the planetary housing 200 </ b> B, the constant speed output side opening 265 (see FIGS. 2 and 3) is closed.

  That is, the planetary housing 200B has a planetary second end wall 200B (2) provided with a bearing recess 265B in place of the constant speed output side opening 265, as compared with the planetary housing 200. .

The constant speed input unit 250B is substantially different from the constant speed input unit 253 only in that the constant speed output shaft 253 is omitted.
The bearing member 405 that supports the other end side of the constant speed input portion 250B is disposed in the bearing recess 256B.

  Also in the HMT structure 2 having such a configuration, the same effect as in the first embodiment can be obtained.

  In the present embodiment, the pump shaft 21 and the constant speed input unit 250B are operatively connected to the drive source in a parallel state.

FIG. 12 shows a view taken in the direction of arrow XII in FIG.
In the present embodiment, a pulley transmission mechanism 460B that transmits rotational power from the driving source to the constant speed transmission shaft 450 includes a driving pulley (not shown) that is operatively driven to rotate by the driving source; A constant speed transmission pulley 461 supported on the constant speed transmission shaft 450 so as not to rotate relative to the pump shaft 21, and a pump drive pulley 462 supported on the pump transmission shaft 490B connected to the pump shaft 21 so as not to rotate relative to the pump shaft 21; , And a transmission belt 465 wound around the pulleys 461 and 462.

Embodiment 3
Hereinafter, still another embodiment of the HMT structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 13 is a developed cross-sectional view of the state in which the HMT structure 3 according to the present embodiment is attached to the transmission 500.
FIG. 14 is a schematic transmission diagram of a working vehicle 600 to which the HMT structure 3 is applied.
In the figure, the same members as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted as appropriate.

  In the HMT structure 3 according to the present embodiment, as in the second embodiment, power transmission from the drive source to the pump shaft 21 and power transmission from the drive source to the constant speed input unit 250C are in parallel. It is done in

  In the present embodiment, as shown in FIGS. 13 and 14, the power transmission from the drive source 910 to the pump shaft 21 is a first drive pulley 470 that is operatively rotated by the drive source 910. (1), the pump drive pulley 462 supported so as not to rotate relative to the pump transmission shaft 490B, the first drive pulley 470 (1), and the first drive belt wound around the pump drive pulley 432 It is performed via a pulley transmission mechanism 460C (1) including 460C (1).

  On the other hand, power transmission from the drive source 910 to the constant speed input unit 250C is relative to the second drive pulley 470 (2) operatively driven by the drive source 910 and the constant speed transmission shaft 450. A pulley transmission mechanism 460C including the constant-speed transmission pulley 461 that is supported so as not to rotate, and the second drive-side pulley 470 (2) and the second transmission belt 465 (2) wound around the constant-speed transmission pulley 461. (2) is performed.

  As shown in FIG. 14, the working vehicle 600 is in the form of a combine, and the HMT structure 3 is a traveling system transmission path from the driving source 910 to a traveling member 920 such as a pair of left and right traveling crawlers. Is inserted.

  The working vehicle 600 was cut by a reaping device 620 (first working device), a threshing device (second working device) (not shown) for threshing the harvested cereal meal, and a reaping device 620 as working devices. It has a conveying device 625 (third working device) that conveys the harvested cereal meal to the threshing device.

  In the working vehicle 600, the rotational power of the drive source 910 is transmitted to the work device drive shaft 635 via the first work system pulley transmission mechanism 630, and the rotational power of the work device drive shaft 635 is the second work power. It is transmitted to the conveying device drive shaft 626 that drives the conveying device 625 through the system pulley transmission mechanism 640, and the rotational power of the conveying device drive shaft 626 is transmitted to the reaping device 620 through the third work system pulley transmission mechanism 645. Has been communicated.

Further, rotational power is transmitted to the threshing device from the working device drive shaft 635 via a transmission mechanism (not shown).
In addition, the code | symbol 915 in FIG. 14 is a radiator.

  In the HMT structure 3 according to the present embodiment, the constant speed input side opening 255 is formed in the planetary second end wall 200C (2) on the side connected to the mission case 510 which is a predetermined mounting location. Yes.

  Specifically, the HMT structure 3 includes a pump unit 20C and a motor unit 50C that form the HST 10, and a planetary unit 100C.

  The planetary unit 100C includes the planetary gear mechanism 101 and a planetary housing 200C.

  The planetary housing 200C defines the planetary space 200S between the planetary second end wall 200C (2) connected to the mission case 510 and the planetary second end wall 200C (2). The planetary first end wall 200C (1), which is spaced apart from the planetary second end wall 200C (2) in the reference direction and to which the motor unit 50C is connected, and the planetary first and second end walls 200C. (1) and a planetary peripheral wall 205 extending in the reference direction so as to connect the peripheral edges of 200C (2).

  The planetary second end wall 200C (2) has the synthetic output side opening 285 in the overlapping region that is in contact with the mission case 510, and the reference side from the overlapping region does not overlap with the mission case 510. The constant speed input side opening 255 is provided in an extending region extending in a direction orthogonal to the direction.

  In the present embodiment, the constant speed input section 250C has the planetary first and second end walls 200C (1) with one end extending outwardly through the constant speed input opening 255. , 200C (2) through a bearing member 400, 405, and a constant speed input shaft 251C supported so as to be rotatable about its axis, and the transmission gear 252.

  An outwardly extending portion of the constant speed input shaft 251C is coupled to the constant speed transmission shaft 450 through a coupling 451 so as not to rotate relative to the axis.

  The motor unit 50C includes the motor shaft 51, the hydraulic motor 55, and a motor housing 60C.

  The motor housing 60C includes the motor-side housing body 65 and a motor-side port block 70C that is detachably connected to the motor-side housing body 55 so as to close the opening of the motor-side housing body 55. Yes.

  As in the first and second embodiments, the end wall 68 of the motor-side housing body 55 forms a connection-side end wall connected to the planetary housing 200C, and the motor-side port block 70C is connected to the connection-side end. A free end side end wall that is spaced apart from the connection side end wall in the axial direction of the motor shaft 51 is formed so as to define a housing space for the hydraulic motor 55 between the wall and the wall.

  The pump unit 20C is detachably connected to a free end side end wall of the motor housing 60C (the motor side port block 70C in the illustrated embodiment).

  The pump unit 20C includes the pump shaft 21, the hydraulic motor 25, and a pump housing 30C.

  The pump housing 30C includes the pump-side housing body 35 and a pump-side port block 40C that is detachably connected to the pump-side housing body 35 so as to close the opening of the pump-side housing body 35. Yes.

As shown in FIG. 13, in the present embodiment, the pump-side port block 40 </ b> C and the motor-side port block 70 </ b> C are formed by a single common port block 95.
Instead, the pump-side port block 40C and the motor-side port block 70C are separated, and both the port blocks 70C, 40C are sandwiched between the pump-side housing body 35 and the motor-side housing body 65. The two port blocks 40C and 70C can be arranged adjacent to each other.

  Regardless of whether the two port blocks 40C and 70C are integrally formed or separately formed, the end face on one side of the port block forming the two port blocks 40C and 70C acts as a pump mounting surface. In addition, by making the other end surface act as a motor mounting surface, the connecting oil path between the hydraulic pump 25 and the hydraulic motor 55 can be shortened without using parts such as the hydraulic oil pipe 85 shown in FIG. This can increase the operating efficiency of the HST.

As described above, in the present embodiment, the pump-side port block 40C and the motor-side port block 70C are formed by a single common port block 95.
In this configuration, the motor-side housing body 65 is connected to the planetary first end wall 200C (1) in contact with the end wall 68 that forms the connection-side end wall, while the common A port block 95 is detachably connected to the motor side housing body 65 so as to close the opening of the motor side housing body 65.
In addition, the pump-side housing body 35 is detachably connected to the common port block 95 so that the opening of the pump-side housing body 35 is closed by the common port block 95.

  Also in the HMT structure 3 having such a configuration, the same effect as in the first and second embodiments can be obtained.

1, 2, 3 HMT structure 10 HST
20, 20C Pump unit 21 Pump shaft 25 Hydraulic pump 30, 30C Pump housing 50, 50C Motor unit 51 Motor shaft 55 Hydraulic motor 60, 60C Motor housing 90 (P) Pump-side movable swash plate (volume changing member)
90 (M) Motor-side movable swash plate (volume changing member)
100, 100B, 100C Planetary unit 101 Planetary gear mechanism 110 Sun gear 120 Planetary gear 130 Internal gear 150 Carrier 200, 200B, 200C Planetary housing 200S Planetary space 200 (1), 200B (1), 200C (1) Planet side first End wall 200 (2), 200B (2), 200C (2) Planet side second end wall 205 Planet side peripheral wall 250 Constant speed input unit 255 Constant speed input side opening 265 Constant speed output side opening 270 Variable input unit 275 Variable input Side opening 280 Synthetic output side 285 Synthetic output side opening 510 Mission case (predetermined mounting location)

Claims (10)

A pump unit having a pump shaft, a hydraulic pump supported by the pump shaft, and a pump housing that houses the hydraulic pump and supports the pump shaft in a state that can be operatively connected to a drive source, a motor shaft, and the motor shaft And a motor unit having a motor housing that accommodates the hydraulic motor and supports the motor shaft in a state where rotational power can be output to the outside. The hydraulic motor is fluidly driven by the hydraulic pump. HST in which the volume of at least one of the hydraulic pump and the hydraulic motor can be changed by a volume changing member;
A sun gear, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear, and the planetary gear rotatably supporting an axis and rotating around the sun gear around the sun gear. A planetary gear mechanism including a rotating carrier, and a planetary unit having a planetary housing that houses the planetary gear mechanism,
The planetary housing is detachable at a predetermined mounting location, and the motor housing is detachable from the planetary housing,
The planetary housing receives rotational power from a drive source in a state where the planetary housing is mounted at the predetermined mounting location, and transmits the rotational power to a constant speed input element formed by one of the internal gear and the carrier. A constant speed input unit; a variable input unit that engages and releases power transmission from the motor shaft to the sun gear that acts as a variable input element in accordance with the attachment and detachment of the motor housing to the planetary housing; and the planetary housing A combined output portion is provided for engaging and releasing the power transmission from the output element formed by the other of the internal gear and the carrier to the predetermined drive member in accordance with attachment / detachment to / from the predetermined mounting location. HMT structure. The planetary housings are located on one side and the other side in the reference direction along the axial direction of the planetary gear mechanism, and planetary first and second ends that define a planetary space that houses the planetary gear mechanism therebetween. Have walls,
One and the other of the planetary side first and second end walls are provided with a variable input side opening that allows access to the variable input unit and a combined output side opening that allows access to the combined output unit, respectively.
The combined output portion is connected to and released from the predetermined drive member via the combined output side opening in accordance with the attachment and detachment of the other planetary side first and second end walls to the predetermined mounting location.
The motor shaft is connected to and released from the sun gear via the variable input side opening in accordance with attachment / detachment of the motor housing to one of the planetary first and second end walls. 2. The HMT structure according to 1.   The HMT structure according to claim 2, wherein the variable input side opening and the combined output side opening are arranged coaxially. A constant speed input side opening is provided in the planetary first end wall or the planetary second end wall,
4. The HMT according to claim 2, wherein the constant speed input unit inputs rotational power from the drive source through the constant speed input side opening and transmits the operation to the constant speed input element. 5. Construction. A constant speed output side opening is provided on an end wall different from the end wall provided with the constant speed side input side opening among the planetary side first and second end walls,
The constant speed input unit inputs rotational power from the driving source through the constant speed input side opening, transmits the operation to the constant speed input element, and outputs to the outside through the constant speed output side opening. The HMT structure according to claim 4, which is enabled.   The HMT structure according to claim 5, wherein the pump shaft is operatively connected to the constant speed input portion through the constant speed output side opening.   5. The HMT structure according to claim 1, wherein the pump shaft and the constant speed input unit are operatively connected in parallel to the drive source. The motor housing includes a connecting side end wall connected to the planetary housing in a contact state, and a free end side end wall located on the opposite side of the planetary housing with respect to a reference direction,
The HMT structure according to claim 7, wherein the pump housing is connected to a free end side end wall of the motor housing. The motor housing has a motor side peripheral wall extending in the axial direction of the motor shaft in a state surrounding the hydraulic motor, and a motor side end wall closing one side of the motor side peripheral wall in the axial direction. A motor-side housing body whose other side in the axial direction is an opening that allows insertion of the hydraulic motor, and a motor-side port block that is detachably attached to the motor-side housing body so as to close the opening,
The pump housing has a pump side peripheral wall extending in the axial direction of the pump shaft in a state of surrounding the hydraulic pump, and a pump side end wall closing one axial direction side of the pump side peripheral wall. A pump-side housing body whose other axial side is an opening that allows the hydraulic pump to be inserted; and a pump-side port block that is detachably attached to the pump-side housing body so as to close the opening;
A motor side end wall of the motor side housing body acts as the connection side end wall, and the motor side port block acts as the free end side end wall;
9. The HMT structure according to claim 8, wherein the motor side port block and the pump side port block are formed by a single common port block.   The combined rotational power output from the output element is continuously variable between the highest speed in the reverse direction and the highest speed in the forward direction by the operation of the volume changing member. An HMT structure according to any one of the above.

Images