JP2013245799A - Hydraulic continuously variable transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic continuously variable transmission which enables operations of assembly to a housing to be easily performed with high positioning accuracy.SOLUTION: A hydraulic continuously variable transmission 10 includes a cylinder block 30, a plunger 40 for a pump, a swash plate 50 for a hydraulic pump, a plunger 60 for a hydraulic motor, a swash plate 70 for the hydraulic motor, and a transmission case 16. The swash plate 70 for the hydraulic motor includes a cradle 72 for a motor, and a swash plate body 74 for the motor, which is supported by the cradle for the motor. The plunger 60 for the hydraulic motor is brought into sliding contact with the swash plate body 74 for the motor in the state of being urged by a spring 61. When a wall surface 16a is not attached, movement of the cradle 72 for the motor is regulated by a stopper S comprising a ball bearing 80 and a protrusion 72d. In addition, when the wall surface 16a is attached, a gap is formed between the ball bearing 80 and the protrusion 72d.

Description

  The present invention relates to a hydraulic continuously variable transmission in which a hydraulic pump and a hydraulic motor are arranged with respect to a cylinder block.

  Conventionally, HMT (Hydraulic Mechanical Transmission) or similar hydraulic continuously variable transmissions as disclosed in the following Patent Documents 1 to 3 have been provided. This hydraulic continuously variable transmission has a configuration in which a variable displacement hydraulic pump and a hydraulic motor are arranged with respect to a cylinder block. The hydraulic continuously variable transmission includes a hydraulic pump plunger fitted as one of the axial directions of the cylinder block in the axial direction of the cylinder block so as to be slidable back and forth within the cylinder block, and an end of the hydraulic pump plunger. A hydraulic pump swash plate that is in sliding contact with the hydraulic pump, and a hydraulic servo that changes the amount of inclination of the hydraulic pump swash plate. Also, on the other axial direction of the cylinder block, as a hydraulic motor component, a hydraulic motor plunger fitted in the cylinder block so as to be slidable back and forth, and a fixed inclination angle slidably contacting the end of the hydraulic motor plunger A swash plate for a hydraulic motor is provided.

  The cylinder block rotates integrally with the input shaft, and a hydraulic pump plunger fitted in the cylinder block is reciprocated by a hydraulic pump swash plate or the like inclined with respect to the axial direction to generate hydraulic pressure. By reciprocating the hydraulic motor plunger by the generated hydraulic pressure, the hydraulic motor swash plate pressed by the hydraulic motor plunger is rotated.

JP 2008-185111 A JP 2012-66823 A

  Here, in the above-described hydraulic continuously variable transmission, an urging means such as a spring is provided to urge the plunger toward the swash plate. In such a configuration, when assembling the hydraulic continuously variable transmission in the housing at the time of manufacturing or maintenance, components such as the plunger and the swash plate are pressed against the urging force acting on the plunger. However, it is necessary to close the housing. Therefore, in a hydraulic continuously variable transmission having a configuration in which the plunger is urged by the urging means, there is a problem that assembly is difficult due to the influence of the urging force acting on the plunger. Further, the hydraulic continuously variable transmission has a structure in which a large number of members are incorporated in a housing. Therefore, it is necessary to be able to position easily and with high accuracy when assembled to the housing so that each member can operate without interfering with other members after the assembly to the housing.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a hydraulic continuously variable transmission that can be easily assembled with a housing with high positioning accuracy.

  The hydraulic continuously variable transmission of the present invention provided to solve the above-described problems includes a cylinder block that is provided on a coaxial line so as to rotate integrally with an input shaft to which rotational power of an engine is input, and the cylinder block. On the other hand, a plurality of plungers for a hydraulic pump inserted so as to be reciprocally slidable on the circumference around the coaxial line, and a hydraulic pump for sliding contact with the tip of the plunger for the hydraulic pump. A swash plate, a plunger for a hydraulic motor inserted so as to be reciprocally slidable on a circumference around a coaxial line on the other axial direction of the cylinder block, and a tip of the plunger for the hydraulic motor slide. A swash plate for the hydraulic motor, and a housing having a detachable wall surface that intersects the input shaft and is detachable, and includes a swash plate for the hydraulic pump and a swash plate for the hydraulic motor. One swash plate has a support body rotatably supported with respect to the input shaft at a position adjacent to the wall surface, and a swash plate main body with which the plunger is slidably contacted. The plate body is supported, the plunger slidingly contacting the swash plate body is urged in the direction toward the wall surface by the urging means, the wall surface of the housing is not attached, and the attachment In a state where the urging force by the urging means is acting on the support via the plunger, a stopper is provided to restrict the movement of the support in the direction approaching the wall surface, and the wall surface is mounted Thus, the support body moves in a direction away from the wall surface, and a gap is formed between the stopper and the support body.

  In the hydraulic continuously variable transmission according to the present invention, the plunger and the swash plate are urged toward the wall surface of the housing by the urging means. However, the movement of the support in the direction approaching the wall surface is restricted by the stopper. Therefore, the hydraulic continuously variable transmission according to the present invention is generated by the urging means because the movement of the swash plate and the plunger is restricted by the stopper even in the state where the wall surface of the housing is not attached at the stage of assembly to the housing. The wall surface can be attached without performing a work such as pushing a member such as a plunger against the reaction force. Therefore, the hydraulic continuously variable transmission according to the present invention can be easily assembled.

  Further, in the hydraulic continuously variable transmission according to the present invention, by mounting the wall surface of the housing, the support body moves in a direction away from the wall surface, and a gap is formed between the stopper and the support body. Become. Therefore, the hydraulic continuously variable transmission according to the present invention is in a state of being accurately positioned so that each member can operate without interfering with other members after being assembled to the housing.

  In the hydraulic continuously variable transmission described above, the support body has a shaft insertion portion through which the input shaft can be inserted, and a protrusion portion that protrudes toward the shaft insertion portion, and the protrusion protrudes in the shaft insertion portion. It may be supported so as to be rotatable with respect to the input shaft by a bearing provided at a position on the wall surface side with respect to the portion, and the bearing and the protruding portion may function as the stopper.

  In the hydraulic continuously variable transmission according to the present invention, the protrusion provided on the support and the bearing provided at a position on the wall surface side with respect to the protrusion function as a stopper. That is, the bearing is located on the extension line of the protrusion. For this reason, the support body cannot move to the wall surface side from the position where the protruding portion abuts against the bearing. Therefore, the hydraulic continuously variable transmission according to the present invention can be easily assembled by the stopper formed by the combination of the bearing and the protrusion.

  ADVANTAGE OF THE INVENTION According to this invention, the hydraulic continuously variable transmission which can implement the assembly | attachment operation | work to a housing easily and with sufficient positioning accuracy can be provided.

It is sectional drawing which showed a part of drive train of the vehicle carrying the hydraulic continuously variable transmission which concerns on one Embodiment of this invention. It is a principal part expanded sectional view which shows the state of the assembly stage of the hydraulic continuously variable transmission shown in FIG.

  Hereinafter, a hydraulic continuously variable transmission 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. In the following description, after describing the device configuration of the hydraulic continuously variable transmission 10, characteristic parts of the assembly method of the hydraulic continuously variable transmission 10 will be described.

≪About device configuration≫
The hydraulic continuously variable transmission 10 shown in FIG. 1 is a so-called HMT or the like. The hydraulic continuously variable transmission 10 includes an input shaft 20, a cylinder block 30, a hydraulic pump plunger 40, a hydraulic pump swash plate 50, a hydraulic motor plunger 60, a hydraulic motor swash plate 70, and a swash plate inclination adjusting mechanism 100. Etc. as main constituent members.

  The hydraulic continuously variable transmission 10 includes a hydraulic continuously variable transmission X that is configured by disposing a variable displacement hydraulic pump P and a hydraulic motor M with respect to the cylinder block 30. The hydraulic continuously variable transmission X supplies the hydraulic motor M with the hydraulic pressure generated in the hydraulic pump P when the input shaft 20 and the cylinder block 30 rotate integrally, and causes the output unit 90 to output rotational power. Is possible. Hereinafter, the configuration of each part of the hydraulic continuously variable transmission 10 configured around the hydraulic continuously variable transmission part X will be described in more detail.

  The input shaft 20 is rotatably supported in the transmission case 16 via ball bearings 22 and 24. Specifically, the transmission case 16 has a wall surface 16a on the distal end side (downstream side of power transmission) of the input shaft 20. An input shaft boss portion 16b is provided at a position corresponding to the input shaft 20 on the wall surface 16a. The tip of the input shaft 20 is rotatably supported by a ball bearing 22 provided in the input shaft boss 16b. The base end side (upstream side of power transmission) of the input shaft 20 is rotatably supported by a ball bearing 24. The rotational power of the engine (not shown) is transmitted to the input shaft 20 via the damper 12, the oil pump 14, and the like.

  The cylinder block 30 is integrally provided at an intermediate position of the input shaft 20. A hydraulic pump P is configured on one side (engine side) of the cylinder block 30 in the axial direction, and a hydraulic motor M is configured on the other side.

  Specifically, the main part of the hydraulic pump P is constituted by a hydraulic pump plunger 40 and a hydraulic pump swash plate 50 provided on one side of the cylinder block 30. Plural hydraulic pump plungers 40 are inserted on one side (engine side) of the cylinder block 30 so as to be slidable at equal intervals on a circumference around the axis. The hydraulic pump plunger 40 is biased toward the hydraulic pump swash plate 50 by a spring 41. In the present embodiment, the hydraulic pump plunger 40 is an odd number of three or more.

  The main part of the hydraulic pump swash plate 50 is constituted by a pump cradle 52, a pump swash plate main body 54, and bearings 56 and 58. The hydraulic pump swash plate 50 is configured such that a pump swash plate main body 54 is attached to a pump cradle 52. Bearings 56 and 58 are interposed between the pump cradle 52 and the pump swash plate main body 54. Thus, the pump swash plate main body 54 is rotatably supported with respect to the pump cradle 52.

  The pump cradle 52 is supported so as not to rotate about the axis of the input shaft 20. The pump cradle 52 is connected to a swash plate inclination adjusting mechanism 100 described in detail later. The hydraulic pump swash plate 50 operates the swash plate inclination adjusting mechanism 100 and swings the pump cradle 52 about the swing center O located on the axis of the input shaft 20, whereby the pump swash plate body The amount of inclination with respect to the axis of the 54 input shafts 20 can be arbitrarily adjusted.

  The hydraulic pump P activates the pump action when the cylinder block 30 and the hydraulic pump plunger 40 attached to the cylinder block 30 rotate about the axis along with the rotation of the input shaft 20. Specifically, the hydraulic pump plungers 40 are stroked between the cylinder block 30 and the pump swash plate body 54 while the cylinder block 30 makes a round around the axis of the input shaft 20 in conjunction with the input shaft 20. The possible length increases or decreases. Therefore, when the hydraulic pump plunger 40 rotates around the axis of the input shaft 20 together with the cylinder block 30 as the input shaft 20 rotates, the hydraulic pump plunger 40 that is in sliding contact with the pump swash plate body 54 reciprocates. Trigger the pump action. The hydraulic pressure generated in the hydraulic pump P can be adjusted according to the amount of inclination of the hydraulic pump swash plate 50. The hydraulic pressure generated in the hydraulic pump P is supplied to the hydraulic motor M side (the hydraulic chamber in the cylinder block 30 that presses the base of the hydraulic motor plunger 60).

  The main part of the hydraulic motor M is constituted by a hydraulic motor plunger 60 and a hydraulic motor swash plate 70 provided on the other side in the axial direction of the cylinder block 30 (opposite the engine and the hydraulic pump P). Plural hydraulic motor plungers 60 are inserted on the circumference around the axis of the input shaft 20 so as to be slidable at equal intervals. The hydraulic motor plunger 60 is biased toward the hydraulic motor swash plate 70 by a spring 61 (biasing means). The hydraulic pump swash plate 50 and the hydraulic motor plunger 60 have different circumferential positions in the cylinder block 30. In the present embodiment, the hydraulic motor plunger 60 is an odd number of three or more.

  The main part of the swash plate for hydraulic motor 70 is composed of a motor cradle 72 (support), a motor swash plate main body 74, and bearings 76 and 78. The hydraulic motor swash plate 70 is configured such that a motor swash plate main body 74 is attached to a motor cradle 72. Bearings 76 and 78 are interposed between the motor cradle 72 and the motor swash plate main body 74. Thus, the motor swash plate body 74 is supported so as to be rotatable with respect to the motor cradle 72.

  Unlike the pump cradle 52 described above, the motor cradle 72 cannot be adjusted in angle, and is supported rotatably with respect to the input shaft 20. Specifically, as shown in FIG. 2, the motor cradle 72 is a cylindrical member having a shaft insertion portion 72a through which the input shaft 20 can be inserted, and a ball bearing 80 provided in the shaft insertion portion 72a. Is supported so as to be rotatable relative to the input shaft 20. In addition, a bearing mounting portion 72b formed to have a stepped cross section is provided on the outer peripheral portion of one end side (end portion on the wall surface 16a side) of the motor cradle 72. The motor cradle 72 is rotatably supported by interposing an angular ball bearing 88 between a bearing mounting portion 72b and a cradle boss portion 16c formed in an annular shape on the wall surface 16a of the transmission case 16. . The angular ball bearing 88 is installed at a position that wraps (overlaps) in the inter-axis direction (direction intersecting the input shaft 20 and the output shaft 92) with respect to the ball bearing 22 provided to support the input shaft 20. ing.

  Further, a swash plate body mounting portion 72 c is provided on the outer peripheral portion on the other end side of the motor cradle 72. A swash plate body 74 for motor is attached to the swash plate body attachment portion 72c via bearings 76 and 78 so as to be inclined at a predetermined angle with respect to the input shaft 20. Therefore, in the hydraulic motor swash plate 70, the motor swash plate main body 74 is held at a constant angle, and the amount of inclination is changed like the pump swash plate main body 54 of the hydraulic pump swash plate 50 described above. I can't. A hydraulic motor plunger 60 is urged by a spring 61 and is in sliding contact with the motor swash plate body 74.

  On the other end side of the motor cradle 72, a flange-shaped projecting portion 72d formed so as to project toward the shaft insertion portion 72a is provided. The protrusion 72d is provided at a position opposite to the wall surface 16a with respect to the ball bearing 80. Further, the ball bearing 80 exists on the extension line in the axial direction of the input shaft 20 with respect to the protruding portion 72d. That is, the projecting portion 72d is in a positional relationship in which the ball bearing 80 and the input shaft 20 wrap (overlap) in the axial direction. In other words, the ball bearing 80 exists on the flow line of the protrusion 72d. Therefore, the motor cradle 72 (hydraulic motor swash plate 70) cannot move to the wall surface 16a side from the position where the protrusion 72d abuts against the ball bearing 80. That is, the combination of the protrusion 72d and the ball bearing 80 functions as a stopper S that restricts the movement of the motor cradle 72 in the direction of approaching the wall surface 16a.

  The hydraulic motor M exhibits its function as a motor when the cylinder block 30 and the hydraulic motor plunger 60 attached thereto rotate around the axis of the input shaft 20 as the input shaft 20 rotates. Specifically, the hydraulic motor plunger 60 reciprocates and slides with the pressure oil supplied from the hydraulic pump P side, and applies a thrust load to the hydraulic motor swash plate 70, together with the cylinder block 30 and the input shaft 20. Rotate around the axis. As a result, the hydraulic motor M can function as a motor and output rotational power to the output unit 90. The rotational speed (reduction ratio) output from the hydraulic motor M changes according to the hydraulic pressure supplied from the hydraulic pump P described above. Therefore, the rotational speed (reduction ratio) output to the output unit 90 can be adjusted by operating the swash plate inclination adjusting mechanism 100 to change the inclination of the hydraulic pump swash plate 50.

  As shown in FIG. 1, the output unit 90 is a part that outputs rotational power generated by the action of the hydraulic pump P toward the differential gear 120 and the drive shaft 122 connected thereto. The output unit 90 is configured around an output shaft 92 (second axis) disposed substantially parallel to the input shaft 20. The output shaft 92 is inserted into an output shaft boss portion 16 d formed on the wall surface 16 a of the transmission case 16, and is rotatably supported via a ball bearing 93. The ball bearing 93 is in the inter-axis direction (the input shaft 20 and the output shaft) with respect to the angular ball bearing 88 provided for supporting the pump cradle 52 and the ball bearing 22 provided for supporting the input shaft 20. It is installed at the position where it wraps (overlaps) in the direction intersecting with 92. The output shaft 92 is provided with a wet friction clutch 95, a parking gear 97, and a parallel shaft gear 98 in this order in the axial direction.

  A second parallel shaft gear 96 is provided at one end of the output shaft 92 so as to be integrally rotatable. The second parallel shaft gear 96 meshes with a first parallel shaft gear 94 that is integrally provided on the outer periphery of the motor cradle 72. Therefore, the rotational power generated by the operation of the hydraulic pump P can be transmitted from the input shaft 20 to the output shaft 92 via both gears 94 and 96. A parallel shaft gear 98 is provided on the other end side of the output shaft 92. The parallel shaft gear 98 meshes with a parallel shaft gear 124 provided on the differential gear 120 side. Therefore, the rotational power transmitted from the hydraulic pump P to the output shaft 92 can be transmitted to the drive shaft 122 via the differential gear 120.

  The hydraulic continuously variable transmission 10 uses the swash plate inclination adjusting mechanism 100 to adjust the inclination of the hydraulic pump swash plate 50, thereby rotating the rotation speed (reduction ratio) output to the drive shaft 122 via the output unit 90. ), And the output rotation direction can be switched. Specifically, the swash plate inclination adjusting mechanism 100 includes a connection piece 102 connected to the pump cradle 52 of the hydraulic pump swash plate 50 and an actuator 104 connected to the connection piece 102. The swash plate inclination adjusting mechanism 100 can adjust the amount of inclination by swinging the motor cradle 72 by operating the actuator 104.

  Here, in the hydraulic continuously variable transmission 10, the actuator 104 is contracted, and the hydraulic pump swash plate 50 is inclined in the direction of arrow A in FIG. Rotating speed can be accelerated. On the contrary, by increasing the protrusion amount of the actuator 104 and inclining in the direction opposite to the arrow A (arrow B direction), the reduction ratio is increased and the rotational speed output to the output unit 90 is reduced. be able to. Further, when the hydraulic pump swash plate 50 is inclined by a predetermined angle in the deceleration direction (arrow B direction), the reduction ratio becomes infinite. When the angle of the hydraulic pump swash plate 50 when the reduction ratio becomes infinite is the boundary angle θ, the hydraulic pump swash plate 50 is further in the direction of arrow B (deceleration direction / increase direction of the reduction ratio) than the boundary angle θ. ), The rotation direction output to the output unit 90 can be reversed.

≪Assembly method≫
Next, characteristic parts in the method of assembling the hydraulic continuously variable transmission 10 will be described. As shown in FIG. 2, the hydraulic continuously variable transmission 10 is assembled by installing the above-described components in the case body 16 e of the transmission case 16 and then mounting the wall surface 16 a.

  Specifically, the angular ball bearing 88 is press-fitted into the bearing mounting portion 72 b of the motor cradle 72 before the wall surface 16 a is attached, and then the motor cradle 72 is inserted into the input shaft 20. Thereafter, the ball bearing 80 is press-fitted and the spacer 130 is inserted. In this state, the ball bearing 22 is press-fitted, and the nut 132 is attached to complete the attachment of each member to the input shaft 20 (see FIG. 2).

  In the state shown in FIG. 2, the wall surface 16a and the case body 16e are brought close to each other, and the ball bearing 22 and the angular ball bearing 88 are fitted into the input shaft boss portion 16b and the cradle boss portion 16c. As a result, the tip end portion of the input shaft 20 and one end side of the motor cradle 72 are rotatably supported via the ball bearing 22 and the angular ball bearing 88. The wall surface 16a is fixed to the case body 16e by attaching bolts 132 (not shown in FIG. 2) from the wall surface 16a side to the case body 16e. Thereby, the assembly work of the hydraulic continuously variable transmission 10 to the transmission case 16 is completed.

  Here, as described above, the hydraulic motor plunger 60 and the hydraulic motor swash plate 70 are biased toward the wall surface 16 a by the spring 61. However, the hydraulic motor swash plate 70 (motor) is provided by a stopper S configured by a combination of a ball bearing 80 provided between the input shaft 20 and the motor cradle 72 and a protrusion 72d provided on the motor cradle 72. The movement of the cradle 72) in the proximity direction to the wall surface 16a is restricted. That is, the protrusion 72d of the motor cradle 72 is brought into contact with the ball bearing 80 and cannot move, and the hydraulic motor swash plate 70 (motor cradle 72) moves toward the wall surface 16a from this position. I can't. Therefore, when the nuts 134 and 136 are attached to the input shaft 20 and the output shaft 92, and the bolt 132 is attached, the hydraulic motor plunger 60 and the hydraulic motor swash plate 70 are pushed against the reaction force generated by the spring 61. The mounting work of the wall surface 16a can be easily performed without performing the above work.

  By attaching the wall surface 16a to the case main body 16e as described above, the motor cradle 72 is pushed away from the wall surface 16a. As a result, the protrusion 72d of the motor cradle 72 that has been in contact with the ball bearing 80 at the stage before the wall surface 16a is attached is separated from the ball bearing 80, and a gap is formed between them. As a result, the motor cradle 72 (hydraulic motor swash plate 70) is positioned in an operable position without interfering with other members such as the ball bearing 80.

  In the present embodiment, the ball bearing 80 mounted on the input shaft 20 and the protrusion 72d formed on the motor cradle 72 are used as constituent elements of the stopper S. However, the present invention is not limited to this. It is not limited to. Specifically, the protruding portion 72d can be brought into contact with the input shaft 20 side using a washer or the like instead of the ball bearing 80, and the protruding portion 72d can be prevented from moving toward the distal end side of the input shaft 20. It is good also as a structure which provided the member. Further, a member created separately as a substitute for the projecting portion 72 d may be attached to the motor cradle 72. The projecting portion 72d can also be configured by a protrusion or the like provided on the inner peripheral side of the motor cradle 72, in addition to a flange formed over substantially the entire circumference of the motor cradle 72.

  In the present embodiment, the first parallel shaft gear 94 is integrally provided on the motor cradle 72. However, the present invention is not limited to this, and the first parallel shaft gear 94 is not limited thereto. A corresponding structure may be provided separately from the motor cradle 72.

  In the present embodiment, as an example in which the engine is of a horizontal type, a configuration in which the configuration including the output shaft 92 disposed substantially parallel to the input shaft 20 is used as the output unit 90 is illustrated. The present invention is not limited to this. Specifically, when the engine is of the vertical type, the first parallel shaft gear 94 and the second parallel shaft gear 96 are not provided, and the output unit 90 of the hydraulic continuously variable transmission 10 is wet. It can be set as the structure which can output motive power toward a propeller shaft (not shown) via a friction clutch (not shown).

  In the present embodiment, an example in which the inclination of the swash plate 50 for the hydraulic pump is made variable by the swash plate inclination adjustment mechanism 100 and the inclination of the swash plate 70 for the hydraulic motor is fixed is shown, but the present invention is limited to this. It is not something. That is, a configuration in which the inclination of the swash plate for hydraulic motor 70 can be changed by a mechanism corresponding to the swash plate inclination adjusting mechanism 100 instead of the swash plate for hydraulic pump 50, or the swash plate for hydraulic motor is added to the swash plate 50 for hydraulic pump. The plate 70 may have a variable inclination.

  INDUSTRIAL APPLICABILITY The present invention can be used as, for example, a hydraulic continuously variable transmission mounted on a vehicle such as an automobile, a motorcycle, a working vehicle such as a tractor, and particularly in a compact vehicle such as a light vehicle. It can be suitably used.

10 Hydraulic continuously variable transmission 16 Transmission case (housing)
16a Wall surface 20 Input shaft 30 Cylinder block 40 Plunger for hydraulic pump 50 Swash plate for hydraulic pump 60 Plunger for hydraulic motor 61 Spring 70 Swash plate for hydraulic motor 72 Motor cradle (support)
72a Shaft insertion part 72d Protruding part 74 Motor swash plate body S Stopper

Claims (2)

A cylinder block provided on a coaxial line integrally with the input shaft to which the rotational power of the engine is input;
Plural plungers for hydraulic pumps inserted in a reciprocating manner at intervals on a circumference around the coaxial line on one axial direction of the cylinder block;
A swash plate for a hydraulic pump that is in sliding contact with the tip of the plunger for the hydraulic pump;
On the other side in the axial direction of the cylinder block, a plunger for a hydraulic motor inserted so as to be reciprocally slidable on the circumference around the coaxial line; and
A swash plate for a hydraulic motor with which a tip of a plunger for the hydraulic motor is in sliding contact;
A housing that intersects the input shaft and has a detachable wall surface;
One of the swash plate for the hydraulic pump and the swash plate for the hydraulic motor is in slidable contact with a support body rotatably supported with respect to the input shaft at a position adjacent to the wall surface. A swash plate body, wherein the swash plate body is supported with respect to the support,
The plunger slidingly contacting the swash plate body is urged in a direction toward the wall surface by the urging means,
In a state where the wall surface of the housing is not attached and the urging force of the urging means is acting on the support body via a plunger, the movement of the support body in a direction close to the wall surface is restricted. There is a stopper,
The hydraulic continuously variable transmission characterized in that the support body moves in a direction away from the wall surface when the wall surface is mounted, and a gap is formed between the stopper and the support body. Machine. The support has a shaft insertion portion through which the input shaft can be inserted, and a protrusion protruding toward the shaft insertion portion, and is located on the wall surface side with respect to the protrusion in the shaft insertion portion. It is rotatably supported with respect to the input shaft by a provided bearing,
The hydraulic continuously variable transmission according to claim 1, wherein the bearing and the protrusion function as the stopper.

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