JPH07762Y2 - HST type axle drive - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to an axle drive device incorporating an HST type transmission.

(B) Conventional Technology Conventionally, the same applicant has publicly known a technology related to a small axle drive device in which an HST transmission is arranged on a side surface of a transmission case and a differential gear device is arranged on the other side. For example, JP-A-64-4513 and JP-B-64-
It is like the technique described in Japanese Patent No. 7894.

(C) Problems to be solved by the present invention The present invention uses a side clutch device that occupies a considerable width in the axial direction as a steering device, and the hydraulic motor and hydraulic pump that make up the HST transmission are also used in the mission case. It is disposed inside the vehicle and constitutes a smaller axle drive device.

In order to configure a sufficient reduction gear even when the HST transmission is installed inside, the reduction gear is configured as a planetary gear type reduction gear, and the planetary gear is supported by the clutch housing of the side clutch device. It was done.

Further, an internal gear is supported on the clutch housing, and a planetary gear is supported on the side of the fixed swash plate case forming the hydraulic motor.

(D) Means for Solving the Problems The object of the present invention is as described above, and the configuration for achieving the object will be described below.

The hydraulic motor M having the hollow motor shaft 4 and the side clutch device are arranged side by side, and one axle connected to the side clutch device is inserted through the hollow motor shaft 4 and the sun gear 16 is provided at the end of the hollow motor shaft 4. Is fixed, and the planetary gear 17 is attached to the side wall of the clutch housing 3 of the side clutch device.
And the internal gear 15 is fixedly mounted on the transmission case 1 to form a speed reducer between the side clutch device and the hydraulic motor M.

Further, the hydraulic motor M having the hollow motor shaft 4 and the side clutch device are arranged side by side, and one axle connected to the side clutch device is inserted and arranged in the hollow motor shaft 4,
A sun gear 16 is fixed to the end of the hollow motor shaft 4, and an internal gear is attached to the clutch housing 3 of the side clutch device.
15, a planetary gear 17 is supported on a fixed swash plate case 33 of the hydraulic motor M, and a speed reducer is formed between the side clutch device and the hydraulic motor M.

(E) Embodiment The purpose and construction of the present invention are as described above. Next, the construction of the embodiment shown in the accompanying drawings will be described.

FIG. 1 is a perspective view showing a portion of an HST type axle drive unit and an operating handle 22, FIG. 2 is a plan sectional view of the HST type axle drive unit, FIG. 3 is a front sectional view of the same, and FIG. 4 is a clutch housing. 3 is a front sectional view of an embodiment in which an internal gear 15 is attached, and FIGS.
FIG. 6 is a side view showing the disengaged state, FIG. 6 is a side view showing the disengaged side clutch, FIG. 7 is a perspective view of the clutch housing 3 and the planetary gears 17, and FIG. 8 is a perspective view of the HST mounting plate 16.

The overall configuration of the HST type axle drive device will be described with reference to FIGS. 2 and 3.

The mission case 1 is configured by joining a front half case 1a and a rear half case 1b. The front part of the front half case 1a is provided with a protrusion for inserting and supporting the pressure pump P, and the hydraulic pump P is inserted into the protrusion.
The pump shaft 11 is further projected.

A movable swash plate 12 is arranged on the hydraulic pump P, and by rotating the movable swash plate 12, the discharge amount and the discharge direction of the pressure oil from the hydraulic pump P are changed to move forward and backward and continuously variable. To do.

Further, the hydraulic pump P is an HST mounting plate 6 which is bent in an "L" shape.
Is fixed to the front surface 6b of the HST mounting plate 6 and the side surface 6
A hydraulic motor M is fixedly installed on the right side surface of a.

An oil passage is bored in the HST mounting plate 6, and the hydraulic passage is discharged from the hydraulic pump P into the oil passage bored in the HST mounting plate 6 to reach the hydraulic motor M, and further returns to the hydraulic pump P. The oil circulation circuit is constructed.

A brake device for braking the hollow motor shaft 4 is formed on the left side surface of the side surface portion 6a of the HST mounting plate 6.

That is, the braking body 14 is urged against the inner wall surface of the case of the mission case 1 by the urging spring 18 to perform braking.

The braking state is released by sliding the braking body 14 leftward against the biasing spring 18.

Further, the hollow motor shaft 4 of the hydraulic motor M is configured as a cylinder shaft, and the right axle 2R is penetrated inside the hollow motor shaft 4, and both the hollow motor shaft 4 and the axle 2R have side surfaces 6a. It is penetrated inside.

Left and right axles 2L and 2R are front half case 1a and rear half case 1
Bearings are sandwiched and supported on the joint surface of b, the abutting portions of the axles 2L and 2R are located inside the clutch housing 3, and a side clutch device is formed inside the clutch housing 3. .

The hydraulic motor M is provided with a fixed swash plate 13, and a fixed swash plate case 33 that supports the fixed swash plate 13 covers the periphery. The fixed swash plate case 33 also has its base fixed to the side surface 6a.

A sun gear 16 is fixed to the left end of the hollow motor shaft 4, and the sun gear 16 is attached to the clutch housing 3 by a pivot shaft 17.
a is meshed with a supported planetary gear 17, and the planetary gear 17 is meshed with an internal gear 15 fixed to the mission case 1.

The rotation of the hollow motor shaft 4 causes the pivot shaft 17a to revolve, and the decelerated rotation is transmitted to the clutch housing 3.

The construction of the side clutch device inside the clutch housing 3 is disclosed in detail in FIG.

A notch groove 3a is formed in the clutch housing 3 along the axle 2L, and the clutch cams 7L, 7R project from the notch groove 3a. The bases of the clutch cams 7L and 7R are pivotally supported on the loose fitting support body 20 of the clutch housing 3, and the loose fitting support body 20 is integrated with the clutch housing 3.
It is loosely fitted to the outer circumference of the abutting portion of the axles 2L and 2R by metal.

Clutch operation slide ring 5L for rotating the clutch cams 7L, 7R,
5R is slidably fitted around the clutch housing 3.

Around the clutch operating slide rings 5L, 5R, there are provided groove portions into which the engaging arm portions of the clutch shifters 8L, 8R are fitted.

The clutch shifters 8L, 8R are operated by side clutch arms 30L, 30R outside the mission case.

When the clutch cams 7L, 7R are slid inward by the clutch shifters 8L, 8R as shown by the arrows in FIG. 3, the clutch cams 7L, 7R are pushed outward and the clutch friction plates 9L, 9R are pressed to push the clutch. It will be turned on.

FIG. 7 shows the states of the clutch housing 3 and the planetary gears 17 in the above embodiment.
The pivot shaft 17a is supported by the clutch housing 3.

Further, FIG. 8 discloses a perspective view of the HST mounting plate 6.

In the embodiment of FIG. 4, the internal gear 15 is not supported by the transmission case 1, but the internal gear 15 is integrally projected from the clutch housing 3.

Since the internal gear 15 is integrated with the clutch housing 3, the portion of the pivot shaft 17a of the planetary gear 17 cannot be pivotally supported by the clutch housing 3, so that the pivot shaft 17a is a fixed component of the hydraulic motor M. Swash plate case 33
It is bearing in the part of.

With this configuration, the pivot shaft 17a does not rotate, so that the planetary gear 17 does not revolve only by its own rotation but the internal gear 15 revolves. The revolution of the internal gear 15 is transmitted to the clutch housing 3, and due to this structure, the rotation of the clutch housing 3 is further delayed and the deceleration ratio can be increased.

Next, referring to FIGS. 1, 5, and 6, the side clutch operation will be described.

Left and right side clutch levers 23 on the front of the operating handle 22
L and 23R are pivotally supported, and a deadman clutch lever 32 is pivotally supported at the rear part.

In normal work, when stopping / starting the aircraft repeatedly in a straight state, the deadman clutch lever 32 is gripped / released.

When steering to the left and right, one of the side clutch levers 23L and 23R is gripped and released to perform the steering operation.

As shown in FIG. 6, side clutch levers 23L, 23
If neither R nor Deadman clutch lever 32 is gripped,
The wires 24L, 24R are pulled by the disengagement springs 34L, 34R, the exposed length of the inner wire is "a", and the clutch is disengaged. In this case, the driving force is not transmitted to the axles 2L and 2R.

When going straight, when the deadman clutch lever 32 is gripped, the side clutch levers 23L and 23L are released as shown in FIG.
Although the outer receptacle 23a of R does not move, the deadman clutch lever 32 is rotated upward, so the exposed length of the inner wire is b, and the side clutch arm 30L, The 30R is rotated, and the left and right side clutches are simultaneously turned on to allow straight running.

When steering, the left and right side clutch levers 23L,
By operating only one of 23R to the front in the traveling direction,
As shown in FIG. 5B, the deadman clutch lever 32 does not move, but the outer receiver 23a rotates upward, so the exposed length returns to a, and only the side clutch on that side is disengaged, and steering is performed. Of.

If neither the side clutch lever 23L, 23R nor the deadman clutch lever 32 is gripped, the urging spring 34L,
Since the side clutch arms 30L and 30R are urged in the disengagement direction by 34R, the side clutch device is disengaged on both the left and right sides, and the aircraft is stopped, so it is safe.

Even if the operator falls down during work, the operator will not grip the deadman clutch lever 32 nor the side clutch levers 23L and 23R, so the aircraft will stop and the operator will not be injured by the mower device etc. is there.

In FIG. 1, the forward / backward rotation of the speed change lever 25 operates the swash plate operation arm 29 of the movable swash plate 12 via the link 27 to perform forward / backward switching and continuously variable transmission.

A brake cam 26 is fixedly mounted on the rotation base of the speed change lever 25, and the brake cam 26 is provided with a cutout recess so that the engaging plate 31 is not pressed when the speed change lever 25 is in the neutral position. -ing

Therefore, the engaging plate 31 is pulled at this portion, the above-mentioned brake shifter 19 is pulled by the braking biasing spring 18, the braking body 14 moves in the braking direction, and the mission case 1
The brakes are applied to the inner wall of the car.

At other shift positions, since the circumferential portion is provided, the engagement plate 31 is pulled and the brake is released.

(F) Effect of the Invention Since the present invention is configured as described above, it has the following effects.

As described in claim (1), the hydraulic motor M having the hollow motor shaft 4 and the side clutch device are arranged side by side, and one of the axles connected to the side clutch device is inserted into the hollow motor shaft 4 so as to pass therethrough. The sun gear 16 is fixed to the end of the shaft 4, the planetary gear 17 is supported on the side wall of the clutch housing 3 of the side clutch device, the internal gear 15 is fixed to the transmission case 1, and the hydraulic motor M and the side clutch device are fixed. Since the planetary speed reducer is configured between the two, the hydraulic motor M, the side clutch device, and the planetary speed reducer can be arranged on the axle, and the mission case 1 in which the HST transmission and the side clutch device are installed is compact. Was able to be configured into.

Further, by disposing the planetary gear type speed reducer between the side clutch device and the hydraulic motor M, the speed reducer can be arranged in a narrow space and a high speed reduction rate can be obtained.

According to claim (2), the internal gear 15 is fixed to the clutch housing 3, and the pivot shaft 17a of the planetary gear 17 is supported by the fixed swash plate case 33 as a bearing. It was possible to arrange a planetary speed reducer with a higher deceleration rate than the device.

[Brief description of drawings]

FIG. 1 is a perspective view showing a portion of an HST type axle drive unit and an operating handle 22, FIG. 2 is a plan sectional view of the HST type axle drive unit, FIG. 3 is a front sectional view of the same, and FIG. 4 is a clutch housing. 3 is a front sectional view of an embodiment in which an internal gear 15 is attached, and FIGS.
FIG. 6 is a side view showing the disengaged state, FIG. 6 is a side view showing the disengaged side clutch, FIG. 7 is a perspective view of the planetary gear 17 of the clutch housing 3, and FIG. 8 is a perspective view of the HST mounting plate 16. 1 …… Mission case 2L, 2R …… Axle 3 …… Clutch housing 4 …… Hollow motor shaft 5L, 5R …… Clutch operating slide ring 6 …… HST mounting plate 7L, 7R …… Clutch cam 8 …… Clutch shifter 22 …… Operating handle 23L, 23R …… Side clutch lever 32 …… Deadman clutch lever

Claims (2)

[Scope of utility model registration request] 1. A hydraulic motor M having a hollow motor shaft 4,
The side clutch device and the side clutch device are arranged side by side, one axle connected to the side clutch device is inserted into the hollow motor shaft 4, and the sun gear 16 is fixedly installed at the end of the hollow motor shaft 4. A planetary speed reducer is configured between the hydraulic motor M and the side clutch device by supporting the planetary gear 17 on the side wall of the No. 3 and fixing the internal gear 15 to the mission case 1.
Type axle drive. 2. A hydraulic motor M having a hollow motor shaft 4,
The side clutch device and the side clutch device are arranged side by side, one axle connected to the side clutch device is inserted into the hollow motor shaft 4, and the sun gear 16 is fixedly installed at the end of the hollow motor shaft 4. 3, an internal gear 15 is fixedly installed, a planetary gear 17 is supported on a fixed swash plate case 33 of the hydraulic motor M, and a planetary speed reducer is configured between the hydraulic motor M and the side clutch device. Axle drive.