JP2007022197A - Wheel motor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wheel motor device capable of directing a hydraulic oil port and an oil port to proper directions respectively, in a wheel motor device with a hydraulic motor unit having a motor housing provided with the hydraulic oil port, and a deceleration unit having a gear housing provided with the oil port for supplying and discharging stored oil. <P>SOLUTION: An assembly formed by connecting a motor housing provided with a hydraulic oil port to a gear housing provided with an oil port can be mounted on a vehicle frame at different positions around an axial line of a motor shaft. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wheel motor device that is provided for each drive wheel, and relates to a wheel motor device that decelerates the rotational output of a hydraulic motor unit and transmits it to the drive wheel.

A wheel motor device installed in a vehicle so that drive wheels can be driven independently is conventionally known (see, for example, Patent Document 1 below).
Such a wheel motor device is provided with a differential gear that differentially connects a pair of drive wheels, so that the wheel motor device can be installed close to the corresponding drive wheel in a state separated from an actuator such as a cooperating hydraulic pump unit. Compared to the transaxle device, a free space can be secured between the pair of drive wheels, and the degree of freedom in designing the vehicle can be improved.

  By the way, in a conventional wheel motor device, a motor housing, a hydraulic motor main body accommodated in the motor housing, a motor shaft driven to rotate by the hydraulic motor main body, and a reduction gear train for reducing the rotational power of the motor shaft. And a gear housing connected to the motor housing so as to accommodate the reduction gear train, and an output shaft that outputs the rotational power reduced by the reduction gear train to the outside (for example, See Patent Document 1 below).

Since the wheel motor device equipped with the reduction gear train can use a low torque / high rotation type hydraulic motor body, the hydraulic motor body can be reduced in size and the amount of hydraulic oil leakage from the hydraulic motor body can be reduced. it can.
However, the conventional wheel motor device with a reduction gear train has not been sufficiently considered from the viewpoint of efficient arrangement of piping connected to the wheel motor device.

In other words, the motor housing is provided with a hydraulic oil port serving as a fluid connection port with the cooperating hydraulic pump body.
On the other hand, the gear housing is provided with at least one supply / discharge port for supplying and discharging lubricating oil to and from the gear train.
Thus, in the wheel motor device, oil ports are provided in each of the motor housing and the gear housing. In which direction it is preferable to direct these oil ports with respect to the vehicle frame. It depends on the vehicle specifications and layout.

In addition, the wheel motor device is usually provided in each of a pair of left and right drive wheels. It is desirable that the pair of wheel motor devices applied to the pair of left and right drive wheels have the same configuration from the viewpoint of manufacturing cost, inventory management, and the like.
However, if the wheel motor device having the same configuration is applied to each of the pair of left and right drive wheels, the arrangement of the hydraulic oil port in one wheel motor device applied to one drive wheel and the other applied to the other drive wheel The arrangement of the hydraulic oil port in the wheel motor device of this will be different.
Thus, if the arrangement of the hydraulic oil ports of one driving wheel wheel motor device and the other driving wheel wheel motor device is different, a piping error or the like is likely to occur.
US Pat. No. 6,811,510

  The present invention has been made in view of the prior art, and includes a hydraulic motor unit having a motor housing provided with a hydraulic oil port, and a gear housing provided with an oil port for supplying and discharging stored oil. One object of the present invention is to provide a wheel motor device that can direct the hydraulic oil port and the oil port in appropriate directions in a wheel motor device including a speed reduction unit.

  The present invention also provides a wheel motor device including a hydraulic motor unit having a motor housing provided with a hydraulic oil port, and a reduction unit that decelerates rotational power from the hydraulic motor unit. It is another object of the present invention to provide a wheel motor device that can match the arrangement of hydraulic oil ports when applied to one of the wheels and when applied to the other of the pair of left and right drive wheels.

In order to achieve the above object, the present invention provides a wheel motor including a hydraulic motor unit that forms an HST in cooperation with a hydraulic pump unit that is spaced apart, and a reduction unit that decelerates the output of the hydraulic motor unit. The hydraulic motor unit includes a hydraulic motor main body fluidly connected to a hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body. And a motor housing that supports the motor shaft so as to be rotatable about an axis, and the speed reduction unit decelerates the rotational power from the motor shaft, and the motor so as to accommodate the speed reduction gear mechanism. A gear housing that is directly or indirectly connected to the housing, and the internal space can store oil. Providing a wheel motor device that includes a gear housing.
The motor housing is formed with a pair of hydraulic oil passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic oil port. The gear housing is formed with an oil port that communicates the internal space with the outside.
An assembly in which the motor housing and the gear housing are directly or indirectly connected can be mounted on the vehicle frame at different positions around the axis of the motor shaft.

Further, the present invention is a wheel motor device including a hydraulic motor unit that forms an HST in cooperation with a separately disposed hydraulic pump unit, and a reduction unit that decelerates the output of the hydraulic motor unit, The hydraulic motor unit includes a hydraulic motor main body fluidly connected to the hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body is accommodated and the motor shaft is A motor housing that is rotatably supported about an axis, and the speed reduction unit reduces the rotational power from the motor shaft, and the motor housing directly or indirectly to accommodate the speed reduction gear mechanism. A gear housing that is connected to the inner space and has an internal space capable of storing oil. To provide a wheel motor apparatus.
The motor housing is formed with a pair of hydraulic oil passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic oil port. The gear housing is formed with an oil port that communicates the internal space with the outside.
The gear housing can be connected to the motor housing at different positions around the axis of the motor shaft.

Further, the present invention is a wheel motor device including a hydraulic motor unit that forms an HST in cooperation with a separately disposed hydraulic pump unit, and a reduction unit that decelerates the output of the hydraulic motor unit, The hydraulic motor unit houses a hydraulic motor main body fluidly connected to the hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, the hydraulic motor main body, and the motor shaft And a motor housing that rotatably supports a reference axis, wherein the reduction unit directly reduces the rotational power from the motor shaft and the motor housing so as to accommodate the reduction gear mechanism. Alternatively, a gear housing that is indirectly connected, and in which the internal space can store oil. Providing a wheel motor device including a.
The reduction gear mechanism rotates relative to the input shaft in a state having an input shaft that is not rotatable relative to the motor shaft on the reference axis, and a rotation center that is eccentric from the reference axis. An eccentric member that is disabled, an external tooth member that is rotatably supported by the eccentric member, and an external tooth member that has external teeth on the outer peripheral surface, and a position that covers the external tooth member cannot be rotated. An inner tooth member fixed to the inner tooth member, the inner teeth meshing with the outer teeth having a different number of teeth from the outer teeth, and a rotation component around the reference axis of the outer tooth member And a decelerated rotation output member that rotates about the reference axis.
A cam hole extending in a direction parallel to the reference axis is formed in the external tooth member.
The reduced rotation output member has a carrier pin having an outer diameter smaller than the inner diameter of the cam hole and inserted through the cam hole, a flange portion that supports the carrier pin and rotates around the reference axis, and the flange An output shaft portion that rotates about the reference axis together with a portion, and at least a portion of the output shaft portion projects outward from the gear housing.
The gear housing is a gear housing main body having an opening provided on an end surface facing the motor housing, and a hollow member sandwiched between the gear housing main body and the motor housing, and acts as the internal gear member. And a hollow member. The motor housing is formed with a pair of hydraulic fluid passages having one end fluidly connected to the hydraulic motor body and the other end opened to the outer surface to form a hydraulic fluid port.
The gear housing body is formed with an oil port that communicates the internal space with the outside, and the gear housing body can be connected to the hollow member at different positions around the reference axis. .

Further, the present invention is a wheel motor device including a hydraulic motor unit that forms an HST in cooperation with a separately disposed hydraulic pump unit, and a reduction unit that decelerates the output of the hydraulic motor unit, The hydraulic motor unit includes a hydraulic motor main body fluidly connected to the hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body is accommodated and the motor shaft is A wheel motor device comprising: a motor housing that is rotatably supported about an axis; and a swash plate that defines the amount of oil supplied and discharged from the hydraulic motor body, and is detachably connected to the motor housing. I will provide a.
The motor housing has a motor housing main body provided with an opening through which the hydraulic motor main body can be inserted on one end side in the axial direction of the motor shaft, and closes the opening in a state of being in contact with the hydraulic motor main body. And a port block coupled to the motor housing body.
The port block has a pair of hydraulic fluid passages, one end of which is fluidly connected to the hydraulic motor main body and the other end is opened to the outer surface to form a hydraulic fluid port. An oil port that communicates the space and the outside is formed.
The port block and the swash plate can be fixed at different positions around the axis of the motor shaft while maintaining the relative positions of the motor housing body and the gear housing around the axis of the motor shaft.

  In the various aspects, preferably, a plurality of the oil ports are provided around the output shaft.

Further, the present invention is a wheel motor device including a hydraulic motor unit that forms an HST in cooperation with a separately disposed hydraulic pump unit, and a reduction unit that decelerates the output of the hydraulic motor unit, The hydraulic motor unit includes a hydraulic motor main body fluidly connected to the hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body is accommodated and the motor shaft is The speed reduction unit includes: a motor housing that is rotatably supported about an axis; and a swash plate that defines an amount of oil supplied to and discharged from the hydraulic motor body, and is detachably connected to the motor housing. A reduction gear mechanism for reducing rotational power from the motor shaft, and the motor housing so as to accommodate the reduction gear mechanism. A gear housing that is directly or indirectly connected to grayed provides wheel motor device that includes a gear housing which has an internal space which is capable of storing fluid.
The motor housing is formed with a pair of hydraulic oil passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic oil port.
The swash plate can be fixed to the motor housing at a first position around the axis of the motor shaft and a second position displaced from the first position by 180 degrees around the axis of the motor shaft.

  According to the present invention, the assembly formed by connecting the motor housing provided with the hydraulic oil port and the gear housing provided with the oil port can be mounted on the vehicle frame at different positions around the axis of the motor shaft. The hydraulic oil port and the oil port can be directed in a desired direction. Therefore, the hydraulic oil port and the pipe connected to the oil port can be matched to the specification and layout of the vehicle.

  According to another aspect of the present invention, the motor housing provided with the hydraulic oil port and the gear housing provided with the oil port can be connected at different positions around the axis of the motor shaft. The port and the oil port can be independently directed in a desired direction. Therefore, the hydraulic oil port and the pipe connected to the oil port can be matched to the specification and layout of the vehicle.

  According to still another aspect of the present invention, rotational power from a hydraulic motor unit is reduced by a reduction gear unit including a reduction gear mechanism having an input shaft, an eccentric member, an external tooth member, an internal tooth member, and a reduction rotation output member. In the wheel motor device that decelerates, the gear housing body provided with the oil port can be connected to the hollow member acting as the internal gear member at different positions around the reference axis on the same axis as the input shaft. The oil port provided in the gear housing body and the hydraulic oil port provided in the motor housing can be independently directed in a desired direction. Therefore, the hydraulic oil port and the pipe connected to the oil port can be matched to the specification and layout of the vehicle.

  According to still another aspect of the present invention, in the wheel motor device including the hydraulic motor unit and the reduction gear unit, the hydraulic oil port is provided while maintaining the relative positions of the motor housing body and the gear housing around the motor shaft. Since the port block and the swash plate that defines the oil supply / discharge amount of the hydraulic motor body can be fixed at different positions around the motor shaft, the hydraulic oil port provided in the port block and the gear housing Each of the oil ports provided in the can be independently directed in a desired direction. Therefore, the hydraulic oil port and the pipe connected to the oil port can be matched to the specification and layout of the vehicle.

  Furthermore, according to the wheel motor device according to another aspect of the present invention, in the wheel motor device including the hydraulic motor unit and the reduction gear unit, the swash plate in the hydraulic motor unit is configured to have a first position around the axis of the motor shaft, Since it can be fixed to the motor housing at the second position displaced by 180 degrees around the axis of the motor shaft from the first position, it can be applied to a pair of left and right drive wheels while sharing components. The arrangement of the hydraulic oil ports of the wheel motor device can be matched.

Embodiment 1
Hereinafter, a preferred embodiment of a wheel motor device according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view of a vehicle 1A to which a wheel motor device 100A according to the present embodiment is applied.

The wheel motor device 100A includes a variable rotation output unit that outputs variable rotation power in cooperation with a separately disposed actuator, and a reduction unit 300A that decelerates the rotation power from the variable rotation output unit and transmits it to drive wheels. And.
The wheel motor device 100A according to the present embodiment includes a hydraulic motor unit 200A as the variable rotation output unit, as will be described later.
Therefore, the working vehicle 1A includes a hydraulic pump unit 500 as the actuator.

  Specifically, as shown in FIG. 1, the vehicle 1 </ b> A includes a pair of main frames 31 disposed along the longitudinal direction of the vehicle and a body frame 30 having a cross member 32 extending between the pair of main frames 31. , A pair of drive wheels 60, a pair of wheel motor devices 100A according to the present embodiment configured to drive the pair of drive wheels 60, and an engine (not shown) supported by the body frame 30. And a hydraulic pump unit 500 that is operatively driven by the engine and forms a HST in cooperation with the hydraulic motor unit in the pair of wheel motor devices 100A. .

  In the illustrated embodiment, in addition to the above-described configuration, the vehicle 1A includes a pair of steering wheels 70 supported in front of the body frame 30 and the pair of steering wheels 70 and the drive wheels 60 with respect to the vehicle longitudinal direction. A mower device 80 disposed therebetween, a duct 90 forming a transport path for transporting grass cut by the mower device 80 to the rear of the vehicle, and an external tank 10 used as an oil sump for hydraulic oil. I have.

The hydraulic pump unit 500 is supported by the pair of main frames 31 in a state where power can be transmitted from a drive source via a power transmission mechanism such as a pulley.
Specifically, as shown in FIG. 1, the hydraulic pump unit 500 includes an input shaft 510 operatively connected to the output shaft of the engine, and a single hydraulic pump body (not shown) driven by the input shaft 510. And a pump case 530 that surrounds the hydraulic pump body and supports the input shaft 510.

In the present embodiment, the hydraulic pump unit 500 is a variable displacement type that can change the discharge direction and the oil amount of the hydraulic pump body in accordance with an external operation.
That is, the hydraulic pump unit 500 includes an output adjustment member (not shown) such as a movable swash plate that changes the discharge direction and the oil amount of the hydraulic pump main body, and the tilt of the output adjustment member in addition to the above configuration. And a control shaft 550 (see FIG. 1) for operating the position.
The control shaft 550 is linked to a speed change operation member such as a speed change pedal provided near the driver's seat through an appropriate link mechanism.

The hydraulic pump body is fluidly connected to the hydraulic motor body in the wheel motor device 100A via the pair of hydraulic oil lines 400.
Specifically, the pump case 530 has a pair of one end fluidly connected to the hydraulic pump body and the other end opened to the outer surface to form a pair of pump side hydraulic oil ports 610P (see FIG. 1). A pump side hydraulic oil passage (not shown) is formed.

Although details will be described later, one end of the motor housing 230A in the hydraulic motor unit 200A is fluidly connected to the hydraulic motor main body 210 and the other end is opened to the outer surface to form a pair of motor side hydraulic oil ports 420P. A pair of motor side hydraulic fluid paths 420 are formed.
The pair of pump-side hydraulic fluid paths and the pair of motor-side hydraulic fluid paths 420 are fluidly connected by a pair of hydraulic oil pipes 410, thereby forming the pair of hydraulic oil lines 400. .

Specifically, in the present embodiment, as described above, the hydraulic pump unit 500 has a single hydraulic pump body.
One end 410F of the pair of hydraulic oil pipes 410 is fluidly connected to one of the pair of pump side hydraulic oil passages and the other hydraulic fluid passage on the high pressure side of the forward travel.
One end of the other 410R of the pair of hydraulic oil pipes 410 is fluidly connected to the hydraulic oil passage on the high pressure side of the pair of pump side hydraulic fluid passages, and the other end is branched.

The other branch end of the one hydraulic oil pipe 410F is fluidly connected to the motor-side hydraulic oil passage 420 on the high-pressure side of each of the pair of wheel motor devices 100A.
Similarly, the other branch end of the other hydraulic oil pipe 410R is fluidly connected to the motor-side hydraulic oil path 420 on the high-reverse side of each of the pair of wheel motor devices 100A.

The pump case 530 includes a pump case body (not shown) provided with an opening through which the hydraulic pump body can be inserted, and a pump-side port block connected to the pump case body so as to close the opening. (Not shown).
The pair of pump side hydraulic fluid passages are formed in the pump side port block.

The hydraulic pump unit 500 further includes a charge pump unit 580 as shown in FIG.
The charge pump unit 580 includes a charge pump main body (not shown) driven by the pump shaft 510 and a charge pump case connected to the pump case 530 so as to surround the charge pump main body. Yes.
The pressure oil from the charge pump unit 580 is used for supplying hydraulic oil to the HST, for example.

Next, 100A is demonstrated about the said wheel motor apparatus.
FIG. 2 is a cross-sectional view of the wheel motor device 100A applied to one drive wheel (left drive wheel in the illustrated embodiment) 60 in the work vehicle 1A, and is a cut surface displaced by 45 degrees from a vertical surface. FIG.
FIG. 3 shows an enlarged view of the wheel motor device 100A in FIG.
FIG. 4 is a longitudinal sectional view of the wheel motor device 100A taken along line IV-IV in FIG.
The wheel motor device 100A provided to one drive wheel (left drive wheel) 60 and the wheel motor device 100A applied to the other drive wheel (right drive wheel) 60 are the virtual center longitudinal line L of the vehicle. A mirror image relationship is obtained in plan view with reference to (see FIG. 1).

  As shown in FIGS. 2 to 4, the wheel motor device 100 </ b> A reduces the rotational power from the hydraulic motor unit 200 </ b> A acting as a variable rotation output unit and the corresponding hydraulic drive unit 60 by reducing the rotational power from the hydraulic motor unit 200 </ b> A. And a speed reduction unit 300A for transmission.

As described above, the hydraulic motor unit 200A, in cooperation with the hydraulic pump unit 500, constitutes an HST that outputs continuously variable speed rotation that can be reversed.
Specifically, as shown in FIGS. 2 to 4, the hydraulic motor unit 200 </ b> A includes a hydraulic motor main body 210 that is fluidly connected to the hydraulic pump main body via the pair of hydraulic oil lines 400, and the hydraulic motor. A motor shaft 220 that supports the main body 210 in a relatively non-rotatable manner, a motor housing 230A that houses the hydraulic motor main body 210 and supports the motor shaft 220 so as to be rotatable about an axis, and supply / discharge oil of the hydraulic motor main body 210 And a swash plate 260 for defining the quantity.

  As described above, the motor housing 230A includes the motor-side hydraulic oil port 420P having one end fluidly connected to the hydraulic motor main body 210 and the other end opened to the outer surface. An oil passage 420 is formed.

Specifically, the motor housing 230A includes a motor housing body 240A that surrounds the hydraulic motor body 210, and a motor-side port block 250A that is detachably connected to the motor housing body 240A.
As shown in FIGS. 3 and 4, the motor housing main body 240 </ b> A has a hollow peripheral wall 241 that surrounds the hydraulic motor main body 210.
The peripheral wall 241 has an opening 242 through which the hydraulic motor main body 210 can be inserted on one end side in the axial direction, and a closed end surface 243 that is closed on the other end side in the axial direction.
The motor-side port block 250A is detachably connected to the motor housing body 241 so as to close the opening 242 while the hydraulic motor body 210 is sandwiched between the motor-side port block 250A.

In the present embodiment, the motor housing 230A is formed with an oil port 230P for communicating the motor housing space defined by the motor housing main body 240A and the motor side port block 250A to the outside. .
Preferably, as shown in FIGS. 2 and 3, a pair of the oil ports 230P are provided. One oil port 230P is used as an oil inflow port, and the other oil port 230P is used as an oil outflow port.
By providing such a configuration, oil can be prevented from staying in the motor housing space.

More preferably, as shown in FIG. 1, the internal space of the oil tank 10, the internal space of each motor housing 230A in the pair of wheel motor devices 100A, and the internal space of the pump housing 530 in the hydraulic pump unit 500 are externally connected. An endless fluid connection can be made through the pipe 450.
By providing such a configuration, the oil tank 10 can be reduced in size, and the retention of the stored oil can be prevented, and the temperature increase of the stored oil can be effectively prevented.

The pair of motor side hydraulic oil passages 420 is formed in the motor side port block 250A.
More specifically, the motor side port block 250A has a motor contact surface on which the hydraulic motor main body 210 is slidably contacted on the inner surface facing the motor accommodating space.
The pair of motor side hydraulic oil passages 420 has one end opened to the motor contact surface via a kidney port and the other end opened to the outer surface to form the motor side hydraulic oil port 420P. ing.

The hydraulic motor main body 210 is supported on the motor shaft 220 so as not to rotate relative to the motor shaft 220 while being sandwiched between the motor contact surface and the swash plate 260.
FIG. 5 shows a partially enlarged view of the vicinity of the hydraulic motor body.
Specifically, as shown in FIGS. 3 to 5, the hydraulic motor main body 210 is in contact with the motor contact surface so that oil can be supplied to and discharged from the pair of motor-side hydraulic fluid passages 420. The cylinder block 211 is supported by the motor shaft 220 so as not to rotate relative to the motor shaft 220, and the piston 212 is accommodated in the cylinder block 211 so as to be movable forward and backward in the axial direction. And a piston 212.
In the present embodiment, as shown in FIG. 5, a shoe 215 is provided at the free end of the piston 212, and the piston 212 is brought into contact with the swash plate 260 via the shoe 215. ing.

The swash plate 260 regulates the advance / retreat range of the piston 212, and thereby the supply / discharge oil amount of the hydraulic motor main body 210 is defined.
Preferably, as shown in FIGS. 3 to 5, the swash plate 260 is detachable from the motor housing main body 240 </ b> A.
In the present embodiment, the swash plate 260 is detachably fixed to the closed end surface 243 of the motor housing main body 240A via a fastening member 265.
As shown in FIG. 5, in the present embodiment, the swash plate 260 is held by the swash plate receiving member 261 that can be attached to and detached from the motor housing main body 240A, and the swash plate receiving member 261. And a sheet member 262.

  Thus, by making the swash plate 260 separate from the motor housing body 240A, one swash plate 260a having a predetermined tilt angle (solid line in FIG. 5) and another having a different tilt angle. The swash plate 260b (see the broken line in FIG. 5) can be exchanged, whereby the continuously variable speed range of the HST can be easily changed.

More preferably, the swash plate 260 can change the attachment position with respect to the motor housing main body 240A around the motor shaft 220.
With such a configuration, when a pair of wheel motor devices 100A having the same configuration is applied to the pair of left and right drive wheels 60, the swash plate 260 (solid line in FIG. 6) in one wheel motor device 100A is connected to the other. By simply displacing the swash plate 260 ′ (broken line in FIG. 6) of the wheel motor device 100A ′ by 180 degrees around the motor shaft 220, the arrangement of the pair of motor side hydraulic oil ports 420P in the one wheel motor device 100A and the other The arrangement of the pair of motor-side hydraulic oil ports 420P ′ in the wheel motor device 100A ′ can be positioned symmetrically with respect to the virtual central vertical plane L (see FIG. 1) of the vehicle.

  In the present embodiment, as described above, the swash plate 260 and the piston 212 are configured to be in contact with each other via the shoe 215. However, as shown in FIG. It is also possible to provide a swash plate 270 of the type in which the free ends of 212 are in direct contact.

In the present embodiment, the hydraulic motor unit 200A includes the fixed swash plate 260, but may include a movable swash plate 280 instead (see FIG. 8).
According to such a configuration, it is possible to expand a continuously variable transmission region of HST formed by the hydraulic motor main body 210 and the hydraulic pump main body.
As shown in FIG. 8, when the hydraulic motor unit 200A includes a movable swash plate 280, the hydraulic motor unit 200A has a control shaft (not shown) for tilting the movable swash plate 280. ) Is provided.

In place of or in addition to the replacement of the swash plates 260, 270, 280 and the change of the installation position of the swash plates 260, 270, the HST continuously variable transmission region may be changed by changing the hydraulic motor body 210. Is possible.
Specifically, it can be changed to a hydraulic motor body with a different number of pistons or a hydraulic motor body with a different capacity per piston.

The motor shaft 220 is supported by the motor housing 230A in a state in which one end portion forming an output end portion extends outward from the motor housing 230A.
In the present embodiment, the motor shaft 220 has one end extending through the motor-side port block 250A and extending outward, and the other end terminated in the internal space of the motor housing 230A. Thus, the motor housing body 240A is supported by the closed end wall 243.

As described above, the deceleration unit 300A is configured to decelerate the variable rotational power from the variable rotational output unit and transmit it to the corresponding drive wheels.
By providing such a deceleration unit 300A, the variable rotation output unit can be downsized.
In particular, when the hydraulic motor unit 200A is provided as the variable rotation output unit as in the present embodiment, a low torque / high rotation type hydraulic motor is provided as the hydraulic motor main body 210 by including the deceleration unit 300A. Since the main body can be used, this makes it possible to reduce the hydraulic oil main body 210 and reduce the amount of hydraulic oil leaked from the hydraulic motor main body 210.

  Specifically, as shown in FIGS. 3 and 4, the reduction unit 300A includes a reduction gear mechanism 310A that reduces the rotational power of the motor shaft 220, and the motor housing that houses the reduction gear mechanism 300A. 230A and a gear housing 370 that is detachably connected to 230A.

In the present embodiment, the reduction gear mechanism 310A is a hypocycloid type reduction mechanism.
FIG. 9 shows a longitudinal sectional view of the reduction gear mechanism 300A along the line IX-IX in FIG.

  As shown in FIGS. 3, 4 and 9, the reduction gear mechanism 310 </ b> A cannot rotate relative to the motor shaft 220 relative to the motor shaft 220 on the same axis as the motor shaft 220 located on the reference axis RL. An eccentric member 330 having an input shaft 320 and a center of rotation that is eccentric from the reference axis RL, the eccentric member 330 not being able to rotate relative to the input shaft 320, and being rotatable relative to the eccentric member 330 An external tooth member 340 extrapolated to the external tooth member, an internal tooth member 350 having an inner diameter larger than the outer diameter of the external tooth member 340 and fixed so as not to rotate at a position covering the external tooth member 340, and the external tooth And a reduced rotation output member 360 that rotates around the reference axis RL by a rotation component of the member 340 around the reference axis RL.

As shown in FIGS. 3 and 4, in the present embodiment, the input shaft 320 is formed integrally with the motor shaft 220.
Of course, the input shaft 320 can be separated from the motor shaft 220.

As shown in FIG. 9, the eccentric member 330 has an axis displaced by e with respect to the reference axis RL, and rotates eccentrically in response to the rotation of the input shaft 320 around the reference axis. Yes.
In the present embodiment, the eccentric member 330 is separate from the input shaft 320, but it is of course possible to integrally form the eccentric member 330 with the input shaft.

The external tooth member 340 has external teeth 341 having the number of teeth Z1 provided on the outer peripheral surface and a cam hole 342 penetrating between one end surface and the other end surface in the axial direction.
Preferably, a plurality of cam holes 342 are provided around the reference axis RL.
The inner tooth member 350 is provided with inner teeth 351 that mesh with the outer teeth 341 on the inner peripheral surface. The inner teeth 351 have a number of teeth Z2 different from the number of teeth Z1 of the outer teeth 341.

  The reduced rotation output member 360 includes a carrier pin 361 inserted through the cam hole 342, a flange portion 362 that supports the carrier pin 361 and rotates about a reference axis RL, and a reference axis RL together with the flange 362. And an output shaft portion 363 that rotates in the direction.

As shown in FIG. 9, the carrier pin 361 has a smaller diameter than the cam hole 342 by an amount corresponding to the eccentric amount e of the eccentric member 330 with respect to the reference axis RL.
As described above, in the present embodiment, the external tooth member 340 is provided with a plurality of cam holes 342.
Accordingly, the reduced rotation output member 360 has a plurality of carrier pins 361 that are inserted through the plurality of cam holes 342, respectively.

As shown in FIGS. 3 and 4, the output shaft portion 363 is supported by the gear housing 370 so as to straddle the inner side and the outer side of the gear housing 370 on the reference axis RL.
The flange portion 362 is provided at a portion of the output shaft portion 363 located in the internal space of the gear housing 370 so as not to be relatively rotatable.

In the reduction gear mechanism 310A having such a configuration, when the eccentric member 330 rotates eccentrically with respect to the reference axis RL as the input shaft 320 rotates about the reference axis RL, the external tooth member 340 also has the eccentricity. Together with the member 330, it rotates eccentrically with respect to the reference axis RL. At this time, since the external teeth 341 are meshed with the internal teeth 351, the external tooth member 340 has a reduction ratio defined by the number of teeth Z1 of the external teeth 341 and the number of teeth Z2 of the internal teeth 351. It is decelerated and rotated.
The carrier pin 361 revolves around the reference axis RL while rolling on the inner peripheral surface of the cam hole 342 by the deceleration eccentric rotation of the external tooth member 340. Then, the revolution of the carrier pin 361 around the reference axis is output to the outside of the gear housing 370 via the output shaft portion 363.

  Preferably, the wheel motor device 100A includes a pair of first and second eccentric members 330a and 330b arranged in parallel along the reference axis direction as the eccentric member 330, as shown in FIGS. In addition, the external tooth member 340 may include a pair of first and second external tooth members 340a and 340b corresponding to the pair of first and second eccentric members 330a and 330b, respectively.

Specifically, as shown in FIG. 9, the first and second eccentric members 330a and 330b are displaced 180 degrees with respect to the reference axis RL.
The first and second external teeth members 340a and 340b include first and second external teeth 341a and 341b and first and second cam holes 342a and 342b extending in a direction parallel to the reference axis RL, respectively. The first and second cam holes 342a and 342b are formed at substantially the same position in the circumferential direction with respect to the reference axis RL.
Thus, by providing the first and second eccentric members 330a and 330b displaced by 180 degrees around the reference axis line RL, it is possible to offset the eccentric torque accompanying the rotation of the eccentric member 330. The input shaft 320 can be stably rotated around the reference axis RL.
In such a configuration, the inner teeth 351 mesh with both the first and second outer teeth 341a and 341b, and the carrier pin 361 is opposed to the first and second cam holes. Interpolated in both 342a and 342b.

Preferably, as shown in FIGS. 3 and 4, the reduced rotation output member 360 is formed with a recess 365 that allows the input shaft 320 to enter the inner end surface facing the input shaft 320. An input shaft bearing member 325 can be disposed between the outer peripheral surface of the input shaft 320 and the inner peripheral surface of the recess 365.
With such a configuration, it is possible to stably support the input shaft 320 while shortening the axial length of the reduction gear mechanism 310A as much as possible.

In the present embodiment, as described above, the input shaft 320 is integrally formed with the motor shaft 220 by a single shaft.
As shown in FIG. 3, the single shaft is supported by the input shaft bearing member 325 at the input shaft side end facing the reduced rotation output member 360, and is opposite to the input shaft side end. The motor shaft end is supported by a motor shaft bearing member 225 provided in the motor housing main body 240A, and the intermediate portion is supported by the motor side port block 250A.

The gear housing 370 is connected to the motor housing 230A so as to support the reduction rotation output member 360 with the tip of the output shaft portion 363 protruding outward and to accommodate the reduction gear mechanism 310A. Has been.
In the present embodiment, as shown in FIGS. 3 and 4, the gear housing 370 includes a gear housing body 380 and a hollow member 390 sandwiched between the gear housing body 380 and the motor housing 230A. Yes.
The hollow member 390 is provided with the inner teeth 351 on the inner peripheral surface. That is, in the present embodiment, the hollow member 390 acts as the internal tooth member 350.

In the present embodiment, as shown in FIGS. 3 and 4, the motor shaft 220 has the output end extending outwardly through the motor-side port block 250 </ b> A.
The gear housing 370 is connected to the motor-side port block 250A so as to surround the output end of the motor shaft 220.

The hollow member 390 is open at both the opposite end face facing the motor housing 230A and the end face opposite to the opposite end face.
The gear housing main body 380 has an opening at an opposite end surface facing the hollow member 390, and an end surface opposite to the opposite end surface is closed.

The gear housing 370 supports the reduced rotation output member 360 so as to be rotatable about the reference axis RL.
Specifically, the deceleration unit 300A is provided with first and second bearing members 301 and 302 for a deceleration rotation output member that support-supports the deceleration rotation output member 360.
As shown in FIGS. 3 and 4, the first and second bearing members 301 and 302 support the flange portion 361 and the output shaft portion 363 of the decelerated rotation output member 360, respectively.

Preferably, the first bearing member 301 is configured to support the reduced rotation output member 360 and to align the gear housing body 380 and the hollow member 390.
Specifically, as shown in FIG. 3, the first bearing member 301 includes an inner ring body 301 a engaged with a recess provided on an outer peripheral surface of the reduced speed rotation output member 360, and an inner periphery of the gear housing main body 380. And an outer ring body 301b engaged with a recess provided so as to straddle the surface and the inner peripheral surface of the hollow member 390, and a rolling element 301c disposed between the inner ring body 301a and the outer ring body 301b. is doing.

  More preferably, the first bearing member 301 is disposed so that at least a part thereof overlaps the input shaft bearing member 325 in the axial direction of the input shaft 320 (see FIGS. 3 and 4). Thereby, the input shaft 320 and the reduced rotation output member 360 can be supported more stably.

In the present embodiment, the gear housing 370 has an internal space capable of storing oil, and the stored oil acts as lubricating oil in the reduction gear mechanism 310A.
Thus, in the aspect in which the gear housing 370 can store oil, preferably, as shown in FIG. 4, one end of the reduction rotation output member 360 is in the internal space of the gear housing 370. A lubricating oil passage 460 that opens to the outer peripheral surface and opens at the other end into the recess 365 can be formed.
By providing such an oil passage 460, lubricating oil can be efficiently supplied to the input shaft bearing member 325, the eccentric members 330a and 330b, and the external teeth members 340a and 340b.

FIG. 10 shows a cross-sectional view along the line XX in FIG.
As shown in FIG. 10, the gear housing 370 is formed with a first oil port 371P that communicates the internal space with the outside.

Preferably, the first oil port 371P is a portion where one end portion of the oil passage 460 is located in the reduced speed rotation output member 360 (hereinafter referred to as oil oil) in a state where the wheel motor device 100A is mounted on the vehicle frame 30. It is provided at a position that overlaps with the outer peripheral surface of the inflow portion) in a side view.
In such a configuration, by using the first oil port 371P as an oil supply port into the gear housing 370, the stirring resistance of the reduction gear mechanism 310A due to the stored oil in the gear housing 370 is made as much as possible. The stored oil can be caused to flow into the oil passage 460 while being reduced.

In other words, in the above-described configuration, only a part of the reduced rotation output member 360 is immersed in the stored oil, so that the reduction gear mechanism 310A is compared with a mode in which the gear housing 370 is filled with the stored oil. The stirring resistance can be reduced.
Further, according to such a configuration, when the reduced rotation output member 360 rotates about the axis, one end of the oil passage 460 is always immersed in the stored oil. That is, the stored oil flows into the oil passage 460 by the rotation of the reduction rotation output member 360 around the axis, thereby efficiently maintaining the supply of the lubricating oil to the reduction gear mechanism 310A. be able to.

More preferably, as shown in FIG. 10, the second oil port 372P positioned below the first oil port 371P when the wheel motor device 100A is mounted on the vehicle frame 30 in the gear housing 370. Can be provided.
In such a configuration, the second oil port 372P is used as an oil inflow port, and the first oil port 371P is used as an oil outflow port, thereby preventing accumulation of stored oil in the gear housing 370. The oil level of the stored oil can be maintained at the desired position.

Here, the mounting state of the wheel motor device 100A to the vehicle frame 30 will be described.
As shown in FIGS. 2 and 3, the wheel motor device 100 </ b> A includes an end portion (hereinafter referred to as an inner end portion in the vehicle width direction) opposite to the side from which the output shaft portion 363 projects of the deceleration rotation output member 360. The mounting part 110 to the vehicle frame 30 is provided.

As described above, in the present embodiment, the motor-side port block 250A is located between the motor housing main body 240A and the gear housing 370.
That is, in the present embodiment, the closed end surface 243 of the motor housing main body 240A forms the inner end portion in the vehicle width direction, and thus the mounting portion 110 is provided on the closed end surface 243. .
Specifically, as shown in FIGS. 2 and 3, the closed end surface 243 is provided with a flange portion extending radially outward, and a mounting hole or a mounting hole acting as the mounting portion 110 is provided on the flange portion. A mounting slit is formed.

Thus, the vehicle frame 30 and the driving wheel 60 can be separated as much as possible by providing the mounting portion 110 at the inner end in the vehicle width direction of the wheel motor device 100A (see FIG. 2). ).
Further, according to such a configuration, the first and second oil ports 371P and 372P and the motor side hydraulic oil port 420P are located outward in the vehicle width direction from the vehicle frame 30. Therefore, the piping connection work to these oil ports can be easily performed.

Preferably, the mounting portion 110 is configured such that the wheel motor device 100A can be attached to the vehicle frame 30 at a plurality of positions around a reference axis RL.
That is, the mounting part 110 is mounted on the vehicle frame at the wheel motor device 100A at least at the first position around the reference axis RL and at the second position displaced from the first position around the reference axis RL. Is allowed to be done.
By providing such a configuration, the direction of the motor side hydraulic oil port 420P and the first and second oil ports 371P and 372P provided in the wheel motor device 100A can be changed. Piping connected to can be efficiently arranged.

  More preferably, when the wheel motor device 100A is mounted on the vehicle frame 30 at the second position around the reference axis RL (see FIG. 11), the second oil port 372P is decelerated in side view. The rotation output member 360 is configured to overlap the portion where the oil inflow portion is formed and the first oil port 371P is positioned below the second oil port 372P, and the wheel motor device 100A is configured to be The vertical position (see FIG. 10) of the first oil port 371P when positioned at the first position and the vertical position (second position) of the second oil port 372P when the wheel motor device 100A is positioned at the second position (see FIG. 10). 11) can be configured to be displaced up and down with respect to the reference axis RL.

By providing such a configuration, it is possible to easily change the oil level position of the stored oil in the gear housing 370 only by changing the attachment position of the wheel motor device 100A to the vehicle frame 30.
For example, if the oil flow into the oil passage 460 is insufficient at the oil level position shown in FIG. 10, the wheel motor device 100A is attached to the vehicle frame 30 at the second position shown in FIG. The amount of oil flowing into the oil passage 460 can be increased.

In the present embodiment, the mounting portion 110 of the wheel motor device 100A has four mounting holes or mounting slits spaced 90 degrees around the reference axis RL, and the wheel motor device. 100A is configured to be mounted at a position displaced 90 degrees around the reference axis RL with respect to the vehicle frame 30.
In such a configuration, for example, when the wheel motor device 100A is positioned at the first position, the first oil port 371P and the second oil port 372P are connected to a virtual horizontal line HL and a virtual vertical line VL that pass through a reference axis RL. And the vertical position of the first oil port 371P when the wheel motor device 100A is positioned at the first position (see FIG. 10). The vertical position (see FIG. 11) of the second oil port 372P when the wheel motor device 100A is positioned at the second position can be made different.

Furthermore, in addition to the above configuration, the wheel motor device 100A according to the present embodiment is configured to be able to change the relative position between the motor side hydraulic oil port 420P and the first and second oil ports 371P and 372P. Has been.
Specifically, the wheel motor device 100A connects the motor-side port block 250A and the swash plate 260 to the reference axis RL while fixing the positions of the gear housing 370 and the motor housing main body 240A around the reference axis RL. The position can be changed around.

By providing such a configuration, the direction of the motor-side hydraulic oil port 420P is fixed while the positions of the first and second oil ports 371P and 372P are fixed at, for example, the positions shown in FIG. It can be changed as shown in (a) to (d) in 12B.
Accordingly, the pipe connected to the first and second oil ports 371P and 372P and the pipe connected to the motor side hydraulic oil port 420P can be appropriately arranged.
Note that HL and VL in FIGS. 12A and 12B are a virtual horizontal line and a virtual vertical line, respectively.

Further, the structure for enabling the relative position between the first and second oil ports 371P, 372P and the motor side hydraulic oil port 420P to be changed is not limited to the above structure.
For example, the gear housing body 380 in which the first and second oil ports 371P and 372P are formed can be connected to the hollow member 390 at different positions around the reference axis RL.
Furthermore, the gear housing 370 can be connected to the motor housing 230A at different positions around the reference axis RL.

Further, in the present embodiment, as described above, the mounting portion 110 is provided at the inner end portion in the vehicle width direction of the wheel motor device 100A, but the present invention is naturally not limited to such a configuration. Absent.
FIG. 13 shows a cross-sectional view of a wheel motor device 100A ′ in which the mounting portion 110 is provided between the inner end portion and the outer end portion in the vehicle width direction.

Thus, by providing the mounting part 110 in the middle region of the wheel motor device 100A in the vehicle width direction, the hydraulic oil pipe 410 is positioned inward in the vehicle width direction from the vehicle frame 30. It is possible to effectively prevent the hydraulic oil pipe 410 from coming into contact with the outside and being damaged while the vehicle is running.
In the form shown in FIG. 13, in order to prevent the motor side hydraulic oil port 420 </ b> P from interfering with the vehicle frame 30, one end of the motor side hydraulic oil passage 420 is fluid to the hydraulic motor main body 210. The other end is connected to the outer surface of the motor housing body 240A.

Embodiment 2
Hereinafter, other embodiments of the wheel motor device according to the present invention will be described with reference to the accompanying drawings.
FIG. 14 is a cross-sectional view of the wheel motor device 100B according to the present embodiment applied to the left drive wheel 60 in the work vehicle 1A, and shows a cross-sectional view at a cut surface displaced by 45 degrees from the vertical surface.
FIG. 15 is a longitudinal sectional view of the wheel motor device 100B.
In the figure, the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the first embodiment, as described above, the motor-side port block 250A is sandwiched between the motor housing main body 240A and the gear housing 370. However, in the wheel motor device 100B according to the present embodiment, The motor housing body 240B is located between the motor side port block 250B and the gear housing 370.

Specifically, as shown in FIGS. 14 and 15, the wheel motor device 100B includes a hydraulic motor unit 200B and the reduction gear unit 300A.
The hydraulic motor unit 200B is the same as the hydraulic motor unit 200A in the first embodiment except that the motor housing 230A is changed to a motor housing 230B.
That is, the hydraulic motor unit 200B houses the hydraulic motor main body 210, the motor shaft 220, and the hydraulic motor main body 210, and a motor housing 230B that supports the motor shaft 220 rotatably around a reference axis RL. The swash plate 260 is provided.

As shown in FIGS. 14 and 15, the motor housing 230B has a motor housing body 240B surrounding the hydraulic motor body 210 and a motor side port block 250B removably connected to the motor housing body 240B. is doing.
The motor housing main body 240B is provided with an opening 242 through which the hydraulic motor main body 210 can be inserted at an end facing inward in the vehicle width direction with reference to a state in which the wheel motor device 100B is mounted on the vehicle frame 30. The closed end surface 243 is the end facing outward in the vehicle width direction.

The motor side port block 250B is detachably connected to the motor housing main body 240B so as to close the opening 242.
And as shown in FIG. 14, the said attaching part 110 is provided in this motor side port block 250B located in the innermost part in the vehicle width direction.

The deceleration unit 300A is detachably connected to the closed end surface 243.
Therefore, in the present embodiment, the motor shaft 220 has one end portion forming the output end portion extending outwardly through the closed end surface 243 of the motor housing main body 240B and opposite to the one end portion. In the state where the other end portion on the side is terminated in the motor-side port block 250B, the closed-end surface 243 and the motor-side port block 250B are rotatably supported around the reference axis RL.

Also in such a wheel motor device 100B, the same effect as in the first embodiment can be obtained.
In the present embodiment, the mounting portion 110 is provided at the inner end in the vehicle width direction (see FIG. 14), and the mounting portion is used as the inner end and the outer end in the vehicle width direction of the wheel motor device. It is also possible to provide between.
FIG. 16 shows a cross-sectional view of a wheel motor device 100B ′ in which the mounting portion is provided between the inner end portion and the outer end portion in the vehicle width direction.
In the form shown in FIG. 16, a flange portion extending radially outward is integrally formed on the closing surface 243 of the motor housing main body 240B, and the mounting portion 110 is provided on the flange portion.
According to such a configuration, as in the configuration of FIG. 13 in the first embodiment, it is possible to effectively prevent the hydraulic oil pipe 410 from coming into contact with the outside and being damaged while the vehicle is running.

Embodiment 3
Hereinafter, still another embodiment of the wheel motor device according to the present invention will be described with reference to the accompanying drawings.
FIG. 17 is a cross-sectional view of the wheel motor device 100C according to the present embodiment applied to the left drive wheel 60 in the work vehicle 1A, and shows a cross-sectional view at a cut surface displaced by 45 degrees from the vertical plane.
FIG. 18 shows an enlarged view of FIG.
FIG. 19 is a longitudinal sectional view of the wheel motor device 100C.
In the figure, the same members as those in the first or second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the wheel motor device 100C according to the present embodiment, in the wheel motor device 100A according to the first embodiment, the eccentric member 330 and the external tooth member 340 are both single, and such a single eccentricity is used. A balance weight 335 for reducing or reducing the eccentric moment caused by the member 330 is provided.

  Specifically, as shown in FIGS. 17 to 19, the wheel motor device includes the hydraulic motor unit 200 </ b> A and a reduction unit 300 </ b> C that is detachably connected to the hydraulic motor unit 200 </ b> A, and includes the hydraulic motor unit 200 </ b> A. And a reduction unit 300C that transmits the rotational power from the motor to the corresponding drive wheels.

The reduction unit 300C includes a reduction gear mechanism 310C that reduces the rotational power of the motor shaft 220, and the gear housing 370 that is detachably connected to the motor housing 230A so as to accommodate the reduction gear mechanism 310C. ing.
The reduction gear mechanism 310C includes the input shaft 320, the single eccentric member 330, the single external tooth member 340, the internal tooth member 350, and the reduction rotation output member 360. The balance weight 335 is provided.

FIG. 20 shows a cross-sectional view along the line XX-XX in FIG.
As shown in FIGS. 18 to 20, the balance weight 335 cannot rotate relative to the input shaft 320 so as to have a weight portion 336 extending in a direction opposite to the eccentric direction of the eccentric member 330 with respect to the reference axis RL. It is supported by.
By providing the balance weight 335, the single eccentric member 330 and the single external tooth member 340 are rotated even though both the eccentric member 330 and the external tooth member 340 are single. It is possible to reduce or reduce the eccentric moment resulting from the.
Therefore, it is possible to stabilize the rotation of the input shaft 320 around the reference axis while reducing the number of parts.

Also in such a wheel motor apparatus 100C, the same effect as in the first embodiment can be obtained.
In the present embodiment, the attachment portion is provided at the inner end portion in the vehicle width direction (see FIG. 17), but the attachment portion 110 is used as the inner end portion and the outer end in the vehicle width direction of the wheel motor device 100C ′. It is also possible to provide between the parts (see FIG. 21).
In the form shown in FIG. 21, a connecting structure for connecting the hollow member 390 and the gear housing main body 380 is also used as the mounting portion 110.
More specifically, the wheel motor device 100C ′ is mounted on the vehicle frame 30 by using a fastening member such as a bolt for fastening the hollow member 390 and the gear housing body 380.
As described above, if the mounting portion 110 is provided between the inner end portion and the outer end portion in the vehicle width direction of the wheel motor device 100C ′, the hydraulic oil pipe 410 may come into contact with the outside and be damaged while the vehicle is running. Can be effectively prevented.

Embodiment 4
Hereinafter, still another embodiment of the wheel motor device according to the present invention will be described with reference to the accompanying drawings.
FIG. 22 is a cross-sectional view of the wheel motor device 100D according to the present embodiment applied to the left drive wheel 60 in the work vehicle 1A, and shows a cross-sectional view at a cut surface displaced by 45 degrees from the vertical surface.
FIG. 23 is a longitudinal sectional view of the wheel motor device 100D.

  As shown in FIGS. 22 and 23, the wheel motor device 100D according to the present embodiment is different from the wheel motor device 100B according to the second embodiment in that both the eccentric member 330 and the external tooth member 340 are single. In addition, the balance weight 335 for reducing or reducing the eccentric moment caused by the single eccentric member 330 is provided.

Also in such a wheel motor device 100D, the same effect as in each of the above embodiments can be obtained.
Of course, as shown in FIG. 24, also in the wheel motor device according to the present embodiment, the mounting portion 110 can be provided between the inner end portion and the outer end portion in the vehicle width direction.

In each of the above embodiments, the case where the wheel motor devices 100A to 100D according to the present invention are applied to the vehicle 1A in which the non-driving wheels 70 are steered wheels steered by the Ackermann type steering mechanism has been described as an example. However, it goes without saying that the present invention can be applied to other types of vehicles.
For example, the present invention can be applied to a vehicle 1B in which the non-driving wheels are caster wheels 75, and the pair of driving wheels 60 are independently driven at different speeds.

Such a vehicle 1B includes a pair of hydraulic pump units 500 as shown in FIG.
In the vehicle 1B, the pair of wheel motor devices 100A to 100D are fluidly connected to the pair of hydraulic pump units 500 via a pair of operation lines 400, respectively. (E.g., the left driving wheel) is driven continuously in a continuously variable manner to allow reverse rotation, and the other of the pair of driving wheels 60 (e.g., the right driving wheel) is driven in a continuously variable manner to allow reverse rotation. And a second HST.

Further, as shown in FIG. 26, the front frame 36 and the rear frame 37 swing through a pivot shaft 35 that is arranged along the vertical direction at the center position between the front and rear wheels and the center position between the left and right wheels. In the body-refractive-type vehicle 1C that is freely connected, the wheel motor device 100A includes a pair of front drive wheels 65 supported by the front frame 36 and a pair of rear drive wheels 60 supported by the rear frame 37, respectively. It is also possible to drive by ~ 100D.
In such a body-refractive vehicle 1C, a wheel motor device supported by a frame (front frame 36 in FIG. 26) opposite to a frame (rear frame 37 in FIG. 26) on which the hydraulic pump unit 500 is supported. Between 100A to 100D and the hydraulic pump unit 500, fluid connection is made by a hydraulic oil line 400 having an elastic pipe 430 on the way.
A vehicle 1C shown in FIG. 26 has a work implement 80 in front of the vehicle.
Also, reference numeral 45 in FIG. 26 is an engine pulley, and reference numeral 46 is a tension pulley. Reference numeral 800 denotes a drive body for transmitting engine power to the work machine 80, and two PTO output pulleys having a rotation center on the same axis as the pivot shaft 35 are arranged, and one of the pulleys is an engine pulley. The 1st transmission belt which receives the drive from 45 is wound, and the 2nd transmission belt is wound around the other with the working machine input pulley.

  Further, in each of the above embodiments, the hydraulic motor units 200A and 200B have been described as examples of the rotation output unit. However, as a matter of course, an electric motor unit can be used instead of the hydraulic motor units 200A and 200B. is there.

In each of the above embodiments, a hypocycloid type reduction mechanism has been described as an example of the reduction gear mechanism. However, the present invention is not limited to such a form.
That is, it is possible to use a planetary gear mechanism or a parallel (external) gear mechanism as the reduction gear mechanism.

FIG. 1 is a plan view of a vehicle to which a wheel motor device according to the present invention is applied. FIG. 2 is a cross-sectional view of the wheel motor device according to the first embodiment of the present invention, and shows a cross section of the cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 3 is an enlarged view of FIG. FIG. 4 is a longitudinal sectional view of the wheel motor device according to the first embodiment, showing a section taken along line IV-IV in FIG. FIG. 5 is a partially enlarged view of the vicinity of the hydraulic motor main body in the wheel motor device according to the first embodiment. FIG. 6 is a partially enlarged view of the vicinity of the hydraulic motor main body in the wheel motor device according to the first embodiment. The fixed swash plate in the wheel motor device applied to one drive wheel is indicated by a solid line, and the other A fixed swash plate in a wheel motor device applied to a drive wheel is indicated by a broken line. FIG. 7 is a partially enlarged view of the vicinity of the hydraulic motor main body in the wheel motor device according to the first embodiment, and shows a modification in which different types of fixed swash plates are provided. FIG. 8 is a partially enlarged view of the vicinity of the hydraulic motor main body in the wheel motor device according to the first embodiment, and shows a modification in which a movable swash plate is provided. FIG. 9 is a longitudinal sectional view of the reduction gear mechanism in the wheel motor device according to the first embodiment, and shows a section taken along line IX-IX in FIG. FIG. 10 is a longitudinal sectional view of the gear housing body in the wheel motor device according to the first embodiment, and shows a cross section taken along the line XX in FIG. FIG. 11 is a longitudinal sectional view of the gear housing body, showing a state where the gear housing body is rotated 90 degrees around the reference axis from the state shown in FIG. 12A is a longitudinal cross-sectional view of the motor-side port block in the wheel motor device according to Embodiment 1, and shows a cross-section along the line XII-XII in FIG. b) shows a state where the motor side port block is rotated 90 degrees around the reference axis. 12B is a longitudinal cross-sectional view of the motor-side port block in the wheel motor device according to the first embodiment, and shows a cross-section along the line XII-XII in FIG. 4, and FIG. d) shows a state where the motor side port block is rotated 90 degrees around the reference axis. FIG. 13 is a cross-sectional view of a modification of the wheel motor device according to the first embodiment, showing a cross section at a cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 14 is a cross-sectional view of the wheel motor device according to the second embodiment of the present invention, and shows a cross section of the cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 15 is a longitudinal sectional view of the wheel motor device according to the second embodiment. FIG. 16 is a cross-sectional view of a modified aspect of the wheel motor device according to the second embodiment, showing a cross section at a cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 17 is a cross-sectional view of the wheel motor device according to the third embodiment of the present invention, showing a cross section at a cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 18 is an enlarged view of FIG. FIG. 19 is a longitudinal sectional view of the wheel motor device according to the third embodiment. FIG. 20 is a longitudinal sectional view of the reduction gear mechanism in the wheel motor device according to the third embodiment, showing a section taken along line XX-XX in FIG. FIG. 21 is a cross-sectional view of a modified aspect of the wheel motor device according to the third embodiment, showing a cross section at a cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 22 is a cross-sectional view of the wheel motor device according to the fourth embodiment of the present invention, and shows a cross section at a cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 23 is a longitudinal sectional view of the wheel motor device according to the fourth embodiment. FIG. 24 is a cross-sectional view of a modified embodiment of the wheel motor device according to the fourth embodiment, showing a cross section at a cut surface displaced by 45 degrees with respect to the vertical surface. FIG. 25 is a plan view of another vehicle to which the wheel motor device according to the present invention is applied. FIG. 26 is a plan view of still another vehicle to which the wheel motor device according to the present invention is applied.

Explanation of symbols

1A, 1B, 1C Vehicle 30 Vehicle frame 60, 65 Drive wheel 100A-100D Wheel motor device 200A, 200B Hydraulic motor unit 210 Hydraulic motor body 220 Motor shaft 230A, 230B Motor housing 240 Motor housing body 250 Motor side port blocks 260, 270 , 280 Swash plate 300A, 300C Reduction gear unit 310A, 310C Reduction gear mechanism 320 Input shaft 330 Eccentric member 340 External tooth member 341 External tooth 342 Cam hole 350 Internal tooth member 360 Deceleration rotation output member 361 Carrier pin 362 Flange portion 363 Output shaft portion 370 Gear housing 371P, 372P First and second oil port 380 Gear housing body 390 Hollow member 420 Hydraulic oil passage 420P Hydraulic oil port RL Reference axis

Claims (6)

A wheel motor device comprising: a hydraulic motor unit that cooperates with a separately disposed hydraulic pump unit to form an HST; and a reduction unit that decelerates the output of the hydraulic motor unit,
The hydraulic motor unit houses a hydraulic motor main body fluidly connected to a hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body. A motor housing that rotatably supports the shaft around the axis,
The reduction unit includes a reduction gear mechanism that reduces rotational power from the motor shaft, and a gear housing that is directly or indirectly connected to the motor housing so as to accommodate the reduction gear mechanism. A gear housing capable of storing oil,
The motor housing is formed with a pair of hydraulic fluid passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic fluid port.
The gear housing is formed with an oil port that communicates the internal space with the outside.
A wheel motor device characterized in that an assembly in which the motor housing and the gear housing are connected directly or indirectly can be mounted on a vehicle frame at different positions around the axis of the motor shaft. A wheel motor device comprising: a hydraulic motor unit that cooperates with a separately disposed hydraulic pump unit to form an HST; and a reduction unit that decelerates the output of the hydraulic motor unit,
The hydraulic motor unit houses a hydraulic motor main body fluidly connected to a hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body. A motor housing that rotatably supports the shaft around the axis,
The reduction unit includes a reduction gear mechanism that reduces rotational power from the motor shaft, and a gear housing that is directly or indirectly connected to the motor housing so as to accommodate the reduction gear mechanism. A gear housing capable of storing oil,
The motor housing is formed with a pair of hydraulic fluid passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic fluid port.
The gear housing is formed with an oil port that communicates the internal space with the outside.
The wheel motor device according to claim 1, wherein the gear housing is connectable to the motor housing at different positions around an axis of the motor shaft. A wheel motor device comprising: a hydraulic motor unit that cooperates with a separately disposed hydraulic pump unit to form an HST; and a reduction unit that decelerates the output of the hydraulic motor unit,
The hydraulic motor unit houses a hydraulic motor main body fluidly connected to a hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body. A motor housing that rotatably supports the shaft around a reference axis,
The reduction unit includes a reduction gear mechanism that reduces rotational power from the motor shaft, and a gear housing that is directly or indirectly connected to the motor housing so as to accommodate the reduction gear mechanism. A gear housing capable of storing oil,
The reduction gear mechanism is configured to be non-rotatable relative to the input shaft in an eccentric state with respect to the input shaft, and an input shaft that is not rotatable relative to the motor shaft on the reference axis. An eccentric member, an external tooth member supported by the eccentric member so as to be relatively rotatable, an external tooth member provided with external teeth on an outer peripheral surface, and a non-rotatable fixed position at a position covering the external tooth member An internal tooth member, in which the internal teeth meshing with the external teeth are provided by a number of teeth different from the external teeth, and the reference axis line by the rotational component around the reference axis line in the external tooth member A decelerating rotation output member that rotates around,
The external tooth member has a cam hole extending in a direction parallel to the reference axis,
The reduced rotation output member has a carrier pin having an outer diameter smaller than the inner diameter of the cam hole and inserted through the cam hole, a flange portion that supports the carrier pin and rotates around the reference axis, and the flange An output shaft portion that rotates about the reference axis together with a portion, and at least a part of the output shaft portion protrudes outward from the gear housing,
The gear housing is a gear housing main body having an opening provided on an end surface facing the motor housing, and a hollow member sandwiched between the gear housing main body and the motor housing, and acts as the internal gear member. A hollow member,
The motor housing is formed with a pair of hydraulic fluid passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic fluid port.
The gear housing body is formed with an oil port that communicates the internal space with the outside.
The wheel motor device according to claim 1, wherein the gear housing body is connectable to the hollow member at different positions around the reference axis. A wheel motor device comprising: a hydraulic motor unit that cooperates with a separately disposed hydraulic pump unit to form an HST; and a reduction unit that decelerates the output of the hydraulic motor unit,
The hydraulic motor unit houses a hydraulic motor main body fluidly connected to a hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body. A motor housing that supports the shaft so as to be rotatable about an axis, and a swash plate that defines the amount of oil supplied to and discharged from the hydraulic motor body, the swash plate being detachably connected to the motor housing,
The motor housing has a motor housing main body provided with an opening through which the hydraulic motor main body can be inserted on one end side in the axial direction of the motor shaft, and closes the opening in a state of being in contact with the hydraulic motor main body. A port block coupled to the motor housing body,
The port block is formed with a pair of hydraulic oil passages having one end fluidly connected to the hydraulic motor body and the other end opened to the outer surface to form a hydraulic oil port,
The gear housing is formed with an oil port that communicates the internal space with the outside.
The port block and the swash plate can be fixed at different positions around the axis of the motor shaft while maintaining the relative positions of the motor housing body and the gear housing around the axis of the motor shaft. Wheel motor device.   The wheel motor device according to claim 1, wherein a plurality of the oil ports are provided around the output shaft. A wheel motor device comprising: a hydraulic motor unit that cooperates with a separately disposed hydraulic pump unit to form an HST; and a reduction unit that decelerates the output of the hydraulic motor unit,
The hydraulic motor unit houses a hydraulic motor main body fluidly connected to a hydraulic pump main body in the hydraulic pump unit, a motor shaft that supports the hydraulic motor main body so as not to be relatively rotatable, and the hydraulic motor main body. A motor housing that supports the shaft so as to be rotatable about an axis, and a swash plate that defines the amount of oil supplied to and discharged from the hydraulic motor body, the swash plate being detachably connected to the motor housing,
The reduction unit includes a reduction gear mechanism that reduces rotational power from the motor shaft, and a gear housing that is directly or indirectly connected to the motor housing so as to accommodate the reduction gear mechanism. A gear housing capable of storing oil,
The motor housing is formed with a pair of hydraulic fluid passages having one end fluidly connected to the hydraulic motor main body and the other end opened to the outer surface to form a hydraulic fluid port.
The swash plate can be fixed to the motor housing at a first position about the axis of the motor shaft and a second position displaced from the first position about the axis of the motor shaft by 180 degrees. A wheel motor device characterized by the above.

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