JP2002004999A - Radial type hydraulic motor, and driving device having it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure of a radial type hydraulic motor used for driving wheels of a vehicle. SOLUTION: An axle shaft 63 is directly engaged with a cylinder block 43 by spline. The cylinder block 43, the axle shaft 63, and a wheel hub 68 are supported only by an outer bearing 71 and an inner bearing 72. A large diameter 62 of an axle casing 60 covers the cylinder block 43 and a cam ring 41. The axle casing 60 also serves as a motor casing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic motor for generating a rotational driving force by receiving a supply of high-pressure hydraulic oil and a driving apparatus for a wheel having the same, and more particularly to a radial type having a plurality of cylinder chambers and pistons. The present invention relates to a multi-stroke hydraulic motor.

[0002]

2. Description of the Related Art Conventionally, there has been known a hydraulic motor that generates a rotational driving force by supplying a high-pressure hydraulic oil, and a multi-stroke radial hydraulic motor is known as one type of the hydraulic motor. This radial hydraulic motor is published in the Japan Society of Mechanical Engineers, "Handbook of Mechanical Engineering A. Basic Edition B. Advanced Edition"
It is described as a kind of low-speed and high-torque motor in a new version of B5-193 to 195.

[0003] Specifically, the radial hydraulic motor is
It has a cylindrical cylinder block. A plurality of cylinder chambers are radially formed in this cylinder block,
A piston is inserted into each cylinder chamber. Further, a cam ring having irregularities formed on an inner surface side is disposed outside the cylinder block. Then, supply and discharge of hydraulic oil to and from the cylinder chamber are performed, and a cam ring is pressed by a piston to rotate the cam ring and the cylinder block relatively, thereby generating a rotational driving force.

The above-mentioned radial hydraulic motor is provided in vehicles such as forklifts and construction machines, and is sometimes used to drive wheels of these vehicles. FIG. 6 shows a configuration in which a wheel (b) of a forklift is driven using a conventional radial hydraulic motor (a).

[0005] An axle shaft (d) is coaxially provided in the axle casing (c). The axle casing (c) is attached to a forklift body. The tip of the axle shaft (d) is fastened to the wheel of the wheel (b) via the wheel hub (e). The wheel hub (e) is rotatably supported by a pair of bearings (f, f) on the tip end of the axle casing (c). The bearing (f,
Oil seals (g, g) are provided on both sides of f).

[0006] The radial hydraulic motor (a) is configured such that a cylinder block (k) rotates to generate a driving force. Specifically, while the end cap (h), the cam ring (i), and the motor casing (j) are stacked and fastened by bolts, the cylinder block (k) is housed in a space formed by these members. Is formed. A motor shaft (m) for extracting a driving force is coaxially spline-fitted to the cylinder block (k). The motor shaft (m) is supported by the motor casing (j) via a pair of bearings (n, n). Further, an end of the motor shaft (m) penetrates the motor casing (j), and an oil seal (p) for preventing leakage of hydraulic oil is provided on the motor casing (j).

The radial hydraulic motor (a) is fastened and fixed to the axle casing (c) by bolts. Specifically, the end cap (h) is bolted to the base end of the axle casing (c). An axle shaft (d) is attached to the tip of the motor shaft (m).
Are spline-fitted coaxially. And
Radial type hydraulic motor (a) is cylinder block (k)
Is transmitted to the wheel (b) via the motor shaft (m), the axle shaft (d), and the wheel hub (e), thereby driving the wheel (b).

[0008]

As described above, conventionally, the axle side and the hydraulic motor side are treated as separate parts, and the two are combined to form a traveling system of the vehicle. For this reason, bearings and oil seals are provided on both the axle side and the hydraulic motor side, resulting in a complicated configuration. In addition, a motor shaft is required to transmit the rotation of the cylinder block to the axle shaft, which also increases the number of parts.

[0009] To solve this problem, for example, a countermeasure can be considered in which the radial hydraulic motor and the wheels are integrated. That is, contrary to the case of FIG. 6, the radial type hydraulic motor is configured to rotate the cam ring by fixing the cylinder block, and the vehicle wheel is directly attached to the rotating cam ring.

[0010] However, in order to take this measure, the structure of the radial type hydraulic motor must be drastically changed. Also, the structure on the vehicle body side must be significantly changed, and there are difficulties in securing reliability and manufacturing costs. For this reason, there has been a demand for a technology that can simplify the configuration by using the same parts as before and without changing the structure of the vehicle body.

The present invention has been made in view of the above points, and an object of the present invention is to provide a radial type hydraulic motor used for driving wheels of a vehicle while using parts common to the conventional hydraulic motor. The purpose is to simplify the configuration.

[0012]

A first solution of the present invention is directed to a radial hydraulic motor for driving wheels (11) of a vehicle. Then, a plurality of cylinder chambers (45) are radially formed in the cylindrical cylinder block (43), and the piston member (46) is inserted into the cylinder chamber (45), and the outside of the cylinder block (43). A cam ring (41) is disposed on the piston chamber (45) to supply and discharge hydraulic oil to and from the cylinder chamber (45),
While pressing the concave / convex portion (42) of the cam ring (41) to rotate the cylinder block, the cylinder block (4
In (3), the base end of the shaft member (63) is directly fitted to connect the shaft member (63) whose front end is connected to the wheel (11) to the cylinder block (43). A fitting hole (44) is formed.

A second solution taken by the present invention is directed to a radial hydraulic motor for driving wheels (11) of a vehicle. A plurality of cylinder chambers (45) are formed in a cylindrical shape, and a plurality of cylinder chambers (45) are formed radially so as to open to the side surfaces thereof. One cylinder block (43) is inserted into each of the cylinder chambers (45). The piston member (46) defining the working chamber (48) in the cylinder chamber (45) and the concave / convex portion (42) formed on the inner peripheral side abut on the top of the piston member (46). A cam ring (41) provided coaxially with the cylinder block (43), a distal end is connected to the wheel (11), and a base end is connected to the cylinder block (4).
3) a shaft member (63) coaxially fitted with;
A large-diameter portion (62) on the proximal end side covering the cylinder block (43) and the cam ring (41), and the shaft member (63)
And a casing member (60) having a small-diameter portion (61) on the distal end side extending along the shaft member (63) so as to cover the shaft member (63). The piston member (46) is connected to the cam ring (41)
The cylinder block (43) is configured to be rotated by pressing the concave / convex portion (42).

According to a third aspect of the present invention, there is provided the second aspect of the present invention, wherein the front end of the shaft member (63) is connected to a vehicle wheel (11) to form a cylindrical casing. A hub member (68) provided coaxially with the small diameter portion (61) outside the small diameter portion (61) of the member (60), and provided between the hub member (68) and the casing member (60). A shaft member (63) connected to the hub member (68) and a rotatable support of the hub member (68) with respect to the casing member (60). And bearing members (71, 72) that also support the connected cylinder block (43).

According to a fourth aspect of the present invention, there is provided a seal member for preventing leakage of hydraulic oil from between the hub member (68) and the casing member (60). 73) is arranged such that the bearing members (71, 72) are lubricated with hydraulic oil.

A fifth solution taken by the present invention is directed to a radial hydraulic motor for driving wheels (11) of a vehicle. One of the cylinder blocks (43), which is rotated by the supply of hydraulic oil, is engaged at the base end side, and is connected to the wheel (11) at the tip end side to transmit driving force to the wheel (11). A shaft member (63) is provided.

A sixth solution taken by the present invention is directed to a radial hydraulic motor for driving wheels (11) of a vehicle. One of the cylinder blocks (43), which is rotated by the supply of hydraulic oil, is engaged at the base end side, and is connected to the wheel (11) at the tip end side to transmit driving force to the wheel (11). The shaft member (63) and the shaft member (6
3) a casing member (60) having an extension (61) extending so as to cover the same; and a bearing member (71, 71) of the wheel (11) provided on the outer periphery of the extension (61) of the casing member (60). 72), and hydraulic oil inside the casing member (60) is supplied to the bearing members (71, 72) to lubricate the bearing members (71, 72).

A seventh solution taken by the present invention is directed to a driving device for driving a pair of left and right wheels (11) provided in a vehicle. And the second, third, and fourth
Alternatively, a radial hydraulic motor according to the sixth solution is provided one by one corresponding to each wheel (11), while the radial hydraulic motors are integrally formed by being connected to each other by a connecting member (22). Things.

-Operation- In the radial hydraulic motor (21) according to the first to fourth solving means, the cam ring (41) and the cylinder block (4) are provided.
3) is provided coaxially. The cam ring (41) is formed in a cylindrical shape, and an uneven portion (42) in which unevenness is alternately repeated is formed on an inner periphery thereof. The cylinder block (43) formed in a columnar shape is provided inside the cam ring (41). A plurality of cylinder chambers (45) are formed radially in the cylinder block (43), and a piston member (46) is inserted into each cylinder chamber (45). The top of each piston member (46) inserted into the cylinder chamber (45) projects from the side surface of the cylinder block (43).

When high-pressure hydraulic oil is supplied to the working chamber (48) partitioned in the cylinder chamber (45), the hydraulic pressure pushes the piston member (46) out, and the piston member (46) is pushed out.
Is pressed against the uneven portion (42) of the cam ring (41). When the cam ring (41) is fixed, the piston member (46) is pushed out of the cylinder chamber (45) while being in contact with the uneven portion (42) of the cam ring (41), whereby the cylinder block (43) is moved. Rotate. In this way, the hydraulic pressure of the working oil supplied to the working chamber (48) is converted into the rotational force of the cylinder block (43).

In the first solution, a fitting hole (44) is formed at the center of the cylinder block (43). The base end of the shaft member (63) is inserted into the fitting hole (44), and the cylinder block (43) and the shaft member (63) are connected. On the other hand, the tip of the shaft member (63) is connected to the vehicle wheel (11). The torque of the cylinder block (43) is transmitted to the vehicle wheels (11) by the shaft member (63). Therefore, if the shaft member (63) is supported by a bearing or the like with respect to the body of the vehicle, the cylinder block (43) of the radial hydraulic motor (21) is also supported together with the shaft member (63) connected thereto. You.

In the second solution, a casing member (60) is provided so as to cover the outside of the shaft member (63). The casing member (60) is provided with a small diameter part (61) and a large diameter part (62). The small diameter portion (61) is provided on the tip side of the casing member (60). This small diameter part (61)
Is formed in a cylindrical shape extending from the distal end side to the proximal end side of the shaft member (63), and covers the outside of the shaft member (63). The large diameter part (62) is a casing member (60)
And is formed continuously from the base end of the small diameter portion (61). The large diameter portion (62) is formed so as to cover the cylinder block (43) and the cam ring (41). That is, the cylinder block (43) and the cam ring (41) are housed in a space formed inside the large diameter portion (62).

In the third solution, the hub member (68)
Is provided. The hub member (68) is connected to the casing member (6
The small diameter portion (61) is formed in a cylindrical shape having a diameter larger than that of the small diameter portion (61), and is arranged coaxially with the small diameter portion (61) outside the small diameter portion (61). The hub member (68) is for connecting the distal end of the shaft member (63) to the vehicle wheel (11). That is, the shaft member (63) is connected to the wheel (11) via the hub member (68).

The hub member (68) includes a bearing member (71,7).
According to 2), the casing member (60) is rotatably supported by the casing member (60). This bearing member (71, 72) is
8) In addition to supporting the shaft member (63) connected to the hub member (68) and the cylinder block (43) fitted coaxially with the shaft member (63). That is, all of the hub member (68), the shaft member (63), and the cylinder block (43) connected to each other are supported by the casing member (60) via the bearing members (71, 72).

In the fourth solution, the sealing member (7
3) is provided. The seal member (73) seals a gap between the hub member (68) and the casing member (60),
Prevent hydraulic oil from leaking. In addition, the seal member (73) is provided at a position where the bearing members (71, 72) can be lubricated with hydraulic oil. Specifically, the seal member (73) is arranged at a predetermined location where the hydraulic oil can reach the bearing members (71, 72).

In the fifth and sixth solving means, when high-pressure hydraulic oil is supplied to the radial hydraulic motor, the cylinder block (43) rotates. The shaft member (63) is directly engaged with the cylinder block (43). Specifically, the shaft member (63) engages with the cylinder block (43) on the base end side, and is connected to the vehicle wheel (11) on the tip end side. Then, the rotational force of the cylinder block (43) generated by the supply of the hydraulic oil is transmitted to the wheels (11) via the shaft member (63). Thereby, the wheel (11) is driven to rotate.

As described above, the rotational force of the cylinder block (43) is transmitted to the vehicle wheel (11) by the shaft member (63).
Is transmitted to Therefore, if the shaft member (63) is supported by a bearing or the like with respect to the body of the vehicle, the cylinder block (43) of the radial hydraulic motor (21) is also supported together with the shaft member (63) connected thereto. You.

Further, in the sixth solution, the extension (61) extending along the shaft member (63) from the base end side of the casing member (60) covers the shaft member (63). Provided. Further, bearing members (71, 72) for supporting the wheels (11) are provided on the outer peripheral side of the extension (61). Hydraulic oil filled in the casing member (60) is supplied to the bearing members (71, 72). Then, the bearing members (71, 72) are lubricated by the hydraulic oil.

According to the seventh solution, a driving device (20) having the radial hydraulic motor (21) according to the second, third, fourth or sixth solution is constructed. The driving device (20) drives a pair of wheels (11) provided on the left and right sides of the vehicle. The drive device (20) is provided with two radial hydraulic motors (21), one for each of the left and right wheels (11), a total of two. In the driving device (20), the two radial hydraulic motors (21) are connected to each other by a connecting member (22). That is, two radial hydraulic motors (21) are connected by a connecting member (22),
An integrated drive device (20) is configured.

[0030]

According to the first aspect of the present invention, since the fitting hole (44) is formed in the cylinder block (43), the shaft member (63) is formed in the fitting hole (44). ) Can connect the cylinder block (43) and the shaft member (63). Therefore, only the shaft member (63) for transmitting the rotational force of the cylinder block (43) to the wheels (11) needs to be supported by bearings or the like. That is, in addition to the bearing that supports the axle shaft that transmits the generated rotational driving force to the wheels (11), the bearing that supports the motor shaft for extracting the rotational force of the cylinder block (43) is different from the related art. There is no need to provide them (see FIG. 6). Therefore, according to this solution, the configuration of the radial hydraulic motor (21) can be simplified.

According to the second, third, fourth and fifth means, the cylinder block (43) is fixed by the shaft member (63) directly attached to the cylinder block (43).
Can be transmitted to the wheels (11). For this reason,
Only the shaft member (63) for transmitting the rotational force of the cylinder block (43) to the wheels (11) needs to be supported by bearings or the like. In particular, according to the third solution, the hub member (68), the bearing member (71, 72) provided between the casing member (60) and the hub member (68),
It is possible to support all of the shaft member (63) and the cylinder block (43). Therefore, it is not necessary to adopt a conventional structure in which bearings are provided on both the motor side and the axle side as described above, and the number of parts can be reduced and the configuration of the radial hydraulic motor (21) can be simplified.

According to these solutions, the cylinder block (43), the cam ring (41), and the shaft member (63) can be covered with one casing member (60). That is, unlike the related art, it is not necessary to separately provide the motor-side casing and the axle-side casing (see FIG. 6). Accordingly, this also makes it possible to reduce the number of parts and simplify the configuration of the radial hydraulic motor (21). When the radial hydraulic motor is mounted on a vehicle, the casing member (60) can be fixed to the vehicle body.
Reliability can be ensured by adopting a structure similar to the conventional one.

Further, according to the fourth solution, a sealing member (73) is provided between the casing member (60) and the hub member (68).
, Leakage of hydraulic oil can be prevented. Therefore, the structure can be simplified as compared with the case where members such as an oil seal are provided on both the wheel side and the motor side in the related art (see FIG. 5). According to the present solution,
Lubrication of the bearing members (71, 72) with hydraulic oil becomes possible.
For this reason, the bearing members (71, 72) can be reliably lubricated, and the reliability can be improved.

According to the sixth solution, the bearing members (71, 72) for supporting the wheels (11) can be reliably lubricated by the hydraulic oil in the casing member (60). . Therefore, according to the present solution, similarly to the above-described fourth solution, troubles such as seizing of the bearing members (71, 72) can be prevented and reliability can be improved.

In the seventh solving means, a driving device (20) for driving left and right wheels (11) of the vehicle is integrated by using two radial hydraulic motors (21) and a connecting member (22). Is formed. Therefore, when looking at the vehicle body of the vehicle, the drive device (20) is provided so as to penetrate the vehicle from side to side. Therefore, the strength of the vehicle body can be ensured by the integrated drive device (20).

[0036]

Embodiment 1 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The drive device (20) according to the first embodiment is provided in a forklift (10) as shown in FIG. The forklift (10), which is a vehicle, is provided with an engine and a hydraulic pump (not shown). Then, the hydraulic pump is driven by the engine to pressurize the hydraulic oil, and the obtained high-pressure hydraulic oil is supplied to the drive device (20) to drive the left and right front wheels.

As shown in FIG. 2, the driving device (20)
Is formed integrally by connecting two radial hydraulic motors (21) according to the present invention with a connecting member (22). Each radial hydraulic motor (21) (hereinafter simply referred to as a hydraulic motor) is provided for each wheel (11). The connecting member (22) is formed in a cylindrical shape, and both ends thereof are formed in a flange shape. The hydraulic motor (21) is fastened to each end of the connecting member (22) with a bolt (23). Then, the drive device (20) integrally formed as described above is disposed so as to cross the vehicle body of the forklift (10) left and right. Also, one drum brake (14) is provided for each wheel (11) consisting of a wheel (12) and a tire (13).

As shown in FIG. 3, the hydraulic motor (21)
Is composed of a motor section (30) and an axle section (55). FIG. 3 shows one hydraulic motor (21) in the drive device (20). In the description of the first embodiment, “right” or “left” means right or left in FIG.

The motor section (30) is provided with an end cap (31), a passage member (32), a cam ring (41), and a cylinder block (43).

The end cap (31) is formed in a thick cylindrical shape and is arranged at the left end of the motor section (30). The passage member (32) is formed in a cylindrical shape having a smaller thickness and a smaller diameter than the end cap (31). The passage member (32) is inserted into the end cap (31) from the right end face side of the end cap (31). Further, circumferential grooves are formed at corresponding positions on the inner peripheral surface of the end cap (31) and the outer peripheral surface of the passage member (32). When the passage member (32) is inserted into the end cap (31), the first annular passage (3) is formed by these grooves.
3), a second annular passage (34) and a third annular passage (35) are formed.

The end cap (31) has a first supply / discharge passage (36) and a second supply / discharge passage (37) extending in the radial direction. The first supply / discharge passage (36) is open at one end to the outer peripheral surface of the end cap (31), and communicates with the first annular passage (33) at the other end. The second supply / discharge passage (37) is open at one end to the outer peripheral surface of the end cap (31), and communicates with the third annular passage (35) at the other end. Hydraulic oil is supplied to and discharged from the motor section (30) through the first supply and discharge path (36) and the second supply and discharge path (37).

The end cap (31) is provided with a switching valve (38). The switching valve (38) is in a state in which the first annular passage (33) and the second annular passage (34) communicate with each other when the valve body (39) moves, and a state in which the second annular passage (34) and the third annular passage (34) The state is switched to a state in which the annular passage (35) communicates.

The passage member (32) has a plurality of oil passages (40) extending in the axial direction. These oil passages (40) open at one end to the right end surface of the passage member (32). In addition, the oil passage (40) is provided at the other end side with the first to fourth oil passages.
It communicates with any of the third annular passages (33 to 35).

The cam ring (41) is formed in a ring shape having an outer diameter substantially equal to that of the end cap (31). This cam ring (41) is attached to the end cap (3
It is arranged on the right side of 1) and is fastened with the end cap (31) and the bolt (50). As shown in FIG. 4, an uneven portion (42) is formed on the inner peripheral side of the cam ring (41). In the uneven portion (42), a plurality of uneven portions are formed smoothly and continuously alternately.

The cylinder block (43) is formed in a columnar or thick disk shape. The cylinder block (43) is formed to have a smaller diameter than the cam ring (41), and is arranged coaxially inside the cam ring (41). In the center of the cylinder block (43), a fitting hole (4) penetrating the cylinder block (43) in the thickness direction is provided.
4) is formed. The fitting hole (44) is formed as a spline hole. Above cylinder block (43)
Rotates while its left end slides on the right end of the passage member (32).

As shown in FIG. 4, the cylinder block (4
In 3), a plurality of cylinder chambers (45) are formed radially. Each cylinder chamber (45) has a cylinder block (4
It extends in the radial direction of 3), and is open on the outer peripheral surface of the cylinder block (43). One piston (46), which is a piston member (46), is inserted into each cylinder chamber (45). The inserted piston (46) defines a working chamber (48) in the cylinder chamber (45). A roller (47) is provided on the top of each piston (46). When the working oil is supplied to and discharged from the working chamber (48), the piston (46) is kept in a state in which the top roller (47) is in contact with the uneven portion (42) of the cam ring (41), and the cylinder chamber ( 45) Reciprocate inside.

Further, in the cylinder block (43),
The same number of oil passages (49) as the cylinder chamber (45) are formed. Each oil passage (49) has a cylinder block (4
3) Open at the left end face of the cylinder chamber (4
It is open at the bottom of 5) (see FIG. 3). Then, the oil passage (49) of the cylinder block (43) and the passage member (3
The hydraulic oil is supplied to and discharged from the working chamber (48) in the cylinder chamber (45) by communicating with the oil passage (40) of (2).

The axle portion (55) is provided with an axle casing (60) as a casing member, an axle shaft (63) as a shaft member, and a wheel hub (68) as a hub member (68). ing.

The axle casing (60) has a small diameter portion (61) and a large diameter portion (62). The small diameter part (61) is formed in a small diameter cylindrical shape, and is formed on the right end (tip) side of the axle casing (60). The small diameter portion (61) also forms an extension. On the other hand, the large-diameter portion (62) is formed in a large-diameter cylindrical shape continuous from the left end of the small-diameter portion (61), and is formed on the left end side of the axle casing (60). The axle casing (60) is fastened to the connecting member (22) and the end cap (31) by the bolt (23) at the left end of the large diameter portion (62). And this axle casing (60)
Attached to the body of the forklift (10).

The axle casing (6) is coaxial with the axle casing (60).
0). Axle shaft (6
A fitting shaft (64) is formed at the left end (base end) of 3). The fitting shaft portion (64) is configured as a spline shaft. The axle shaft (63) is coaxially coupled to the cylinder block (43) by inserting the fitting shaft (64) into the fitting hole (44) of the cylinder block (43). .

A collar (65) is formed on the axle shaft (63) on the right side of the fitting shaft (64). Between the collar (65) and the cylinder block (43)
Collar (66) is inserted. In addition, a flange portion is formed at the right end (tip) of the axle shaft (63). The flange portion (67) protrudes from the right end of the axle casing (60), and is formed in a disk shape having a larger diameter than the small diameter portion (61) of the axle casing (60).

The wheel hub (68) is formed in a cylindrical shape having a larger diameter than the small diameter portion (61) of the axle casing (60), corresponding to the flange portion (67) of the axle shaft (63). . The wheel hub (68) is arranged coaxially with the small diameter portion (61) of the axle casing (60), and the flange portion (67) of the axle shaft (63) and the bolt (70)
Has been concluded. In addition, a flange portion (69) is formed at the longitudinal center of the wheel hub (68). Then, the wheel hub (68) connects the bolt (15) and the wheel nut (1) at the flange portion (69).
6) is fastened to the wheel (12) of the wheel (11).

The wheel hub (68) is rotatably supported by the axle casing (60) by a pair of tapered roller bearings as bearing members. Of these bearings, the one located on the right side constitutes the outer bearing (71), and the one located on the left side constitutes the inner bearing (72). The only bearings provided for the hydraulic motor (21) according to the first embodiment are the outer bearing (71) and the inner bearing (72). The wheel hub (68), the axle shaft (63) connected to the wheel hub (68), and the cylinder block (43) that is spline-fitted to the axle shaft (63) are all formed of the outer bearing (71). In addition, only the inner bearing (72) is rotatably supported on the axle casing (60).

An oil seal (73) as a seal member is provided on the left side of the inner bearing (72). The oil seal provided on the hydraulic motor (21) according to the first embodiment is only the oil seal (73).
The oil seal (73) prevents leakage of hydraulic oil from a gap between the axle casing (60) and the wheel hub (68).

-Operation- The operation of the hydraulic motor (21) will be described with reference to FIGS. Here, the cylinder block (4) is rotated in the counterclockwise direction in FIG.
The case where 3) rotates will be described.

The hydraulic motor (21) is supplied with hydraulic oil pressurized by a hydraulic pump (not shown) from a first supply / discharge path (36). This high-pressure hydraulic oil enters the first annular passage (33),
The oil is introduced into the working chamber (48) through the oil passage (40) of the passage member (32) and the oil passage (49) of the cylinder block (43). At this time, high pressure hydraulic oil is supplied to a specific working chamber (48) of the plurality of working chambers (48) formed in the cylinder block (43), and the pressure of the working oil is reduced to the cylinder block (4).
Convert to 3) torque.

This will be described with reference to FIG. In the state of FIG. 4, high-pressure hydraulic oil is sent into the fourth working chamber (48) and the eighth working chamber (48). As a result, the fourth piston (46) and the eighth piston (46) are pushed out of the cylinder chamber (45), and the rollers (47) of both pistons (46) press the uneven portions (42) of the cam ring (41). I do. At this time, the roller (47) in the fourth and eighth pistons (46) is located on the slope connecting the top and bottom of the uneven portion (42). Therefore, the roller (47) of both pistons (46) presses the cam ring (41),
The cylinder block (43) rotates counterclockwise.

On the other hand, the second piston (46) in FIG.
And the sixth piston (46), its roller (4
7) is located on the slope from the bottom to the top of the uneven portion (42). For this reason, as the cylinder block (43) rotates, the second and sixth pistons (46) are pushed into the cylinder chamber (45). As the piston (46) moves, hydraulic oil is discharged from the second and sixth working chambers (48). Hydraulic oil flowing out of the working chamber (48) flows into the third annular passage (35) through the oil passage (49) of the cylinder block (43) and the oil passage (40) of the passage member (32). Thereafter, the hydraulic oil is discharged to the outside of the hydraulic motor (21) through the second supply / discharge path (37).

As described above, in the hydraulic motor (21), the working chamber (48) of each cylinder chamber (45) that moves with the rotation of the cylinder block (43) is located at a specific position among the working chambers (48). 48) to supply high-pressure hydraulic oil to the piston (4
The cam ring (41) is pressed by the roller (47) of (6) to rotate the cylinder block (43) counterclockwise. Conversely, when high-pressure hydraulic oil is supplied from the second supply / discharge path (37), the cylinder block (43) rotates clockwise in FIG. That is, the cylinder block (4
3) The rotation direction is reversed. Further, by operating the switching valve (38), the rotation speed of the cylinder block (43) can be doubled. However, the rotation torque obtained in this case is half that in the case of low rotation.

The rotational force of the cylinder block (43) is
The power is transmitted to the wheels (11) by an axle shaft (63) coaxially spline-coupled to the cylinder block (43). Then, the driving force generated by the hydraulic motor (21) is transmitted to the wheels (11), and the wheels (11) are driven to move the forklift (10).

Here, the inside of the axle casing (60) is filled with hydraulic oil. Since the oil seal (73) between the wheel hub (68) and the axle casing (60) is provided on the left side of the inner bearing (72), the outer bearing (71) and the inner bearing (72) Both are in a state of being immersed in hydraulic oil. Therefore, the outer bearing (7
1) and the inner bearing (72)
Lubrication is ensured by the hydraulic oil supplied in 1).

-Effects of First Embodiment- In the first embodiment, the axle shaft (63) is directly spline-fitted into the fitting hole (44) of the cylinder block (43). Therefore, conventionally provided motor shafts and bearings for supporting the motor shafts,
Further, an oil seal for sealing around the motor shaft becomes unnecessary. Further, since the axle casing (60) also serves as the conventional motor casing, the motor casing is not required. Therefore, according to the first embodiment, the number of components constituting the hydraulic motor (21) can be reduced, and the configuration can be greatly simplified.

In the first embodiment, it is possible to use the same axle casing (60) as the conventional one. For this reason, the hydraulic motor (21) can be simplified while using the same components as the conventional one, and the same reliability as the conventional one can be secured.

Further, according to the first embodiment, the outer bearing (71) and the inner bearing (72) can be lubricated with hydraulic oil. Therefore,
Lubrication of these bearings can be ensured, and the reliability can be improved by extending the life of the bearings.

In the first embodiment, the left and right wheels (1
A drive device (20) for driving 1) is integrally formed, and the integrally formed drive device (20) is provided in a posture crossing the body of the forklift (10) left and right. Therefore, the strength of the vehicle body can be ensured by the drive device (20) that crosses the vehicle body.

[0067]

Embodiment 2 Embodiment 2 of the present invention is different from Embodiment 1 in that the hydraulic motor (21) and the connecting member (2
This is a modification of the configuration of 2). Here, parts different from the first embodiment will be described. In the description of the second embodiment, when “right” or “left” is used,
It means right or left in FIG. 3 and FIG.

As shown in FIG. 5, in the hydraulic motor (21) according to the second embodiment, the end cap (31), the cam ring (41), and the axle casing (60) are bolted (7).
4) Fasten with, and connect the simple cylindrical connecting member (22) and axle casing (60) with bolts (75).
To be concluded.

That is, in the first embodiment, the bolt (50) is inserted from the right side of the cam ring (41) to fasten the cam ring (41) and the end cap (31), and the flange of the connecting member (22). A bolt (23) was inserted from the left side to fasten the connecting member (22), the end cap (31), and the axle casing (60) (see FIG. 3). On the other hand, in the second embodiment, a bolt is inserted from the left side of the end cap (31) to fasten the end cap (31), the cam ring (41), and the axle casing (60) with the bolt (74). A bolt (75) is inserted from the right side of the axle casing (60) to fasten the axle casing (60) and the connecting member (22).

As described above, in the second embodiment, the cam ring (41) and the axle casing (60) are directly fastened by the bolts (74). Therefore, unlike the first embodiment, there is no need to consider the interference between the head of the bolt (50) for fastening the cam ring (41) and the end cap (31) and the axle casing (60), and the axle casing (60) )
Can be shortened. Therefore, the size of the hydraulic motor (21) can be reduced.

[Brief description of the drawings]

FIG. 1 is an overall view of a forklift according to a first embodiment.

FIG. 2 is a front view of the driving device according to the first embodiment.

FIG. 3 is an enlarged cross-sectional view illustrating a main part of the driving device according to the first embodiment.

FIG. 4 is an essential part cross-sectional view showing a part of an AA cross section in FIG. 3;

FIG. 5 is an enlarged cross-sectional view illustrating a main part of a driving device according to a second embodiment.

FIG. 6 is an enlarged cross-sectional view showing a main part of a hydraulic motor and an axle portion of a vehicle according to the related art.

[Explanation of symbols]

 (11) Wheel (22) Connecting member (41) Cam ring (42) Uneven part (43) Cylinder block (44) Fitting hole (45) Cylinder chamber (46) Piston (piston member) (48) Working chamber (60) Axle casing (casing member) (61) Small diameter part, extension part (62) Large diameter part (63) Axle shaft (shaft member) (68) Wheel hub (hub member) (71) Outer bearing (bearing member) (72) Inner bearing (bearing member) (73) Oil seal (seal member)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasunari Muromiya 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (72) Inventor Fumiaki Egawa 1-1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin F term (reference) in Yodogawa Seisakusho 3H084 AA03 AA16 AA30 AA45 BB26 BB30 CC12 CC18 CC22 CC34 CC39 CC56 CC57 CC58 CC59 CC62

Claims (7)

[Claims] A radial hydraulic motor for driving wheels (11) of a vehicle, wherein a plurality of cylinder chambers (45) are radially formed in a cylindrical cylinder block (43). A piston member (46) is inserted into the cylinder block, and a cam ring (41) is arranged outside the cylinder block (43) to supply and discharge hydraulic oil to and from the cylinder chamber (45).
Uneven part (42) of cam ring (41) with piston member (46)
Is pressed to rotate the cylinder block. On the cylinder block (43), a shaft member (63) having a distal end connected to the wheel (11) is connected to the cylinder block (43). Shaft member (63)
A radial hydraulic motor in which a fitting hole (44) into which the base end of the above is directly fitted is formed. 2. A radial hydraulic motor for driving wheels (11) of a vehicle, wherein the hydraulic motor is formed in a cylindrical shape and a plurality of cylinder chambers (45) are formed radially so as to open to the side surface thereof. A cylinder block (43); a piston member (46) inserted one by one into each of the cylinder chambers (45) to partition an operation chamber (48) in the cylinder chamber (45); A cam ring (41) provided coaxially with the cylinder block (43) such that the concave and convex portion (42) comes into contact with the top of the piston member (46); A shaft member (63) whose end is coaxially fitted to the cylinder block (43); a large-diameter portion (62) on the proximal end side that covers the cylinder block (43) and the cam ring (41); And the shaft member (63)
And a casing member (60) having a small-diameter portion (61) on the distal end side extending along the shaft member (63) so as to cover the working chamber (48). A radial hydraulic motor configured to rotate the cylinder block (43) by the piston member (46) pressing an uneven portion (42) of the cam ring (41). 3. The radial type hydraulic motor according to claim 2, wherein the distal end of the shaft member (63) is connected to a vehicle wheel (1).
A hub member (68) formed cylindrical and provided coaxially with the small-diameter portion (61) outside the small-diameter portion (61) of the casing member (60) for coupling to the hub member; (68) is provided between the casing member (60) and the hub member (68). The hub member (68) is rotatably supported by the casing member (60), thereby being connected to the hub member (68). A radial hydraulic motor comprising: a shaft member (63); and a bearing member (71, 72) that also supports a cylinder block (43) connected to the shaft member (63). 4. The radial hydraulic motor according to claim 3, wherein the seal member (73) for preventing leakage of hydraulic oil from between the hub member (68) and the casing member (60) is formed of hydraulic oil. A radial hydraulic motor arranged to lubricate the bearing members (71, 72). 5. A radial hydraulic motor for driving wheels (11) of a vehicle, the hydraulic motor being engaged with a cylinder block (43) rotated by supply of hydraulic oil at a base end side and the wheels (11) at a distal end side. A radial hydraulic motor comprising a single shaft member (63) for transmitting driving force to the wheel (11) in connection with the wheel (11). 6. A radial hydraulic motor for driving wheels (11) of a vehicle, the hydraulic motor being engaged with a cylinder block (43) rotated by supply of hydraulic oil at a base end side and the wheels (11) at a tip end side. One shaft member (63) connected to the wheel member (11) to transmit driving force to the wheel (11); and an extension portion (6) extending to cover the shaft member (63).
1), and a bearing member (71, 72) for the wheel (11) provided on the outer periphery of an extension (61) of the casing member (60). A radial hydraulic motor in which hydraulic oil inside the casing member (60) is supplied to the bearing members (71, 72) for lubricating the bearing members (71, 72). 7. A pair of left and right wheels (11) provided on a vehicle.
7. A driving device for driving the radial hydraulic motors, wherein the radial hydraulic motors according to claim 2, 3, 4, or 6 are provided one by one corresponding to each wheel (11). Are connected to each other by a connecting member (22) to form a single unit.