JP2582359Y2 - Hydraulic transmission - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of an axle driving device for driving an axle by an HST type transmission used for a tractor or the like.

[0002]

2. Description of the Related Art Conventionally, a technique such as the technique described in Japanese Utility Model Publication No. Sho 62-44198 has been known.

[0003]

However, in the prior art, in an axle drive device for a vehicle equipped with a vertical engine, an HST type transmission is mounted laterally on a mounting portion of an axle case, and the two are interlocked. Was configured by. Therefore, the whole axle driving device becomes large and the motor shaft of the HST transmission is mounted in a vertical direction, so that a pair of bevel gear devices need to be interposed in order to interlock and connect to the horizontal axle. Therefore, the number of parts is increased, and a space for arranging the parts is required for the axle case, and the case becomes larger. The present invention has improved this point.

[0004]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention is constructed as follows in order to reduce the size of an HST type transmission by mounting it inside an axle case. A cylinder block 7 of the hydraulic pump P, and the cylinder block 20 of the hydraulic motor M, 1 piece mounting rotatably the two surfaces
The oil passage plate 3 has a pump mounting surface 3b and a motor mounting surface 3i that are orthogonal to each other in the oil passage plate 3 so that the rotation axes of the two cylinder blocks 7 and 20 are mounted substantially orthogonal to each other. The crescent-shaped oil passages 3c and 3d opened on the pump mounting surface 3b and the crescent-shaped oil passages 3m and 3n opened on the motor mounting surface 3i are provided in the oil passage plate 3, and the pumps are provided. Parallel to mounting surface 3b
And a pair of linear oil passages orthogonal to the motor mounting surface 3i.
3e and 3f are mutually connected.

[0005]

Next, the operation will be described. The pressure oil discharged from the hydraulic pump P passes from the cylinder block 7 of the hydraulic pump, passes through an oil passage in the oil passage plate 3 having a substantially L-shape, and reaches the cylinder block 20 of the hydraulic motor M. Therefore, the rotation axis centers of the two cylinder blocks 7 and 20 could be mounted substantially orthogonal to each other. That is, the pump mounting surface 3b and the motor mounting surface 3i of the oil passage plate 3 are provided on surfaces orthogonal to each other, and the crescent-shaped oil passages 3c and 3d opened on the pump mounting surface 3b and the motor mounting surface 3i are opened. The crescent-shaped oil passages 3m and 3n are connected to a pair of linear oil passages 3e.
-They are interconnected at 3f.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The purpose of the present invention is as described above, and the structure of the present invention will be described based on the structure of the embodiment shown in the accompanying drawings. 1 is a side view of a small tractor provided with the axle drive device of the present invention, FIG. 2 is a plan sectional view of the axle drive device, and FIG.
4 is also a side sectional view, FIG. 4 is a front sectional view, FIG. 5 is a pump shaft part side sectional view, FIG. 6 is a movable swash plate perspective view, FIG. 7 is an oil passage plate planar sectional view, FIG. FIG. 9 is a sectional view of a slide rod portion, and FIG. 10 is a diagram showing another embodiment of the operation portion of the movable swash plate.

In FIG. 1, a pulley / belt is attached to a pump shaft 6 whose output shaft protrudes vertically downward from an engine E mounted in a bonnet, and which protrudes upward from an axle driving device provided on a front axle 13 of the present invention. The power is transmitted through. A rotary mower R is provided in front of the tractor, and the rotary mower can be attached to the abdomen.
Harvesting work is possible.

Referring to FIGS. 2, 3 and 4, the axle drive of the present invention will be described. The axle case 1 of the axle drive includes a hydraulic pump P having a pump shaft 6, a motor shaft 5 and its gear 5a. Hydraulic motor M having a hydraulic pump P
Oil passage plate 3 on which the cylinder block 7 of the hydraulic motor M and the cylinder block 20 of the hydraulic motor M are rotatably mounted;
A left and right axles 13 differentially connected by a differential gear device D are provided inside the counter shaft 26 having a cutting gear 7 and an engraving gear 26a.

The axle case 1 is composed of a half upper case 1a and a half lower case 1b which can be separated and joined up and down from a plane where the axis of the motor shaft 5 of the hydraulic motor M is included. In the embodiment of the present invention, the plane center includes the axis of the counter shaft 26 and the axis of the axle 13.

That is, the oil passage plate 3 includes a horizontal plate portion 3a and an upright plate portion 3j.
, And four bolts 2, 2, 2, 2 are inserted into bolt holes 3h, 3h, 3h, 3h opened at four corners of the horizontal plate portion 3a, respectively. It is fixed to the split upper case 1a. A pump mounting surface 3b is formed at the center of the upper surface of the horizontal plate portion 3a, and crescent-shaped oil passages 3c and 3d long in the axle direction are opened on the pump mounting surface 3b.
A pump shaft 6 is provided upright at the center of the pump mounting surface 1b.

A bearing hole at the lower end of the pump shaft 6 on the oil passage plate 3 is machined by an end mill having a spherical tip, and a bush 32 having a spherical shape or a spherical shape only at the lower portion is formed at the lower end of the pump shaft 6 inserted into the bearing hole. Are externally fitted and inserted into the bearing holes. A cylinder block 7 is externally fitted to the pump shaft 6, and pistons 8, 8... Urged by springs 9, 9.

The upper ends of the pistons 8 are in contact with a thrust bearing 10, and the thrust bearing 10 is
The movable swash plate 12 has an upper portion 12a formed in a semi-cylindrical shape as shown in FIG.
2b is projected so that the tip of the operation shaft 11 can be engaged.

As shown in FIG. 5, the operating shaft 11 is formed in an L-shape when viewed from the side. A spherical bush 31 is fitted at the tip of a second portion 11a which is a horizontal portion, and a groove of the engaging protrusion 12b is formed. It fits inside so that it can slide easily. The tip of the second portion 11a has a spherical shape as shown in FIG.
Further, it is also possible to adopt a configuration in which it engages with a hole formed in the engagement projection 12b of FIG.

The other end of the operating shaft 11 is vertically supported as a first portion 11b between the pump shaft 6 and the axle 13 in parallel with the pump shaft 6 by the half upper case 1a. The rotation arm 14 is fixed to the upper end, and is connected to the transmission lever via a wire or the like. The rotation of the transmission lever changes the angle of the movable swash plate 12 to change the transmission speed.

A motor mounting surface 3i is formed on the outer surface of the upright portion 3j of the oil passage plate 3, and crescent-shaped oil passages 3m and 3n which are vertically long are formed on the motor mounting surface 3i. Two horizontal oil passages 3e and 3f are formed in the horizontal plate portion 3a from the side opposite to the motor mounting surface 3i in parallel with the plan view and in parallel with the axle, and the ends of the horizontal oil passages 3e and 3f are formed. The crescent oil passages 3e and 3f are in communication with the crescent oil passages 3c and 3d in the middle.

As shown in FIG. 7, the horizontal oil passages 3e and 3f are provided at the ends opposite to the motor mounting surface 3i.
The plug members 15 and 16 for closing the openings of e and 3f are inserted, and a concave portion 3k is provided on the bottom surface 3g of the horizontal plate portion 3a.
Hydraulic oil suction ports 3p and 3q are vertically drilled from the recess 3k toward the center of the plug members 15 and 16. When assembled, a plate-shaped hydraulic oil suction port 3p and 3q that straddles the suction port 3p and 3q and closely contacts the bottom surface 3g around the recess 3k. The filter 17 is provided in the lower half case 1b.

The plug members 15 and 16 have suction ports 3p.
Oil passage 15a communicating between 3q and horizontal oil passages 3e and 3f
16a is drilled, and the valve rods 15b
b is penetrated, and the horizontal oil passages 3e and 3 of the oil passages 15a and 16a
The f-side end is closed by the valve rods 15b and 16b to act as a check valve, and is connected to the horizontal oil passage 3e.
The opening can be made only in the 3f direction.

The outer ends of the valve rods 15b and 16b protrude from the plug members 15 and 16 as shown in FIG. 9 and are inserted into engagement grooves of a leaf spring 19 fixed to the half-half lower case 1b.
The tip of 16b is locked, and the center of the leaf spring 19 is brought into contact with the push rod 18, and the push rod 18 is
b is slidably supported by the shaft b. Therefore, the valve rod 15b
Even when the valve 16a is opened by the pressurized oil, the valve rods 15b and 16b are returned to the original positions by the spring force of the leaf spring 19, and similarly, in the case of traction or the like, the pressure in the HST transmission is depressed by pushing the push rod 18. Even when it is pulled out, the pushing rod 18 is returned to the original position by the spring force of the leaf spring 19.

At the center of the motor mounting surface 3i, a motor shaft 5 is projected in parallel with the axle 13. A cylinder block 20 is externally fitted to the motor shaft 5, and springs 21, 21. Energized piston 22
Are fitted. The piston 22
The tip of .. is in contact with the thrust bearing 24.

A brake 2 is provided at the end of the motor shaft 5.
9 is provided so as to be able to brake by rotating a brake lever 30 provided on the side surface of the axle case 1,
A gear 5a is engraved on the motor shaft 5, and the gear 5a
a meshes with a large-diameter gear 27 fixed on a counter shaft 26, and a notched gear 26a on the counter shaft 26 meshes with a differential ring gear 28 so that the power from the motor shaft 5 is transmitted to the axle 13. Make up.

[0021]

[Effects of the Invention] With the above configuration, the present invention has the following effects. First, the hydraulic pump P
Is a single oil passage plate 3 for rotatably mounting the cylinder block 7 of the hydraulic motor M and the cylinder block 20 of the hydraulic motor M on two surfaces, and the rotational axes of the cylinder blocks 7 and 20 are substantially orthogonal to each other. Since the pump mounting surface 3b and the motor mounting surface 3i are provided on two mutually orthogonal surfaces of the oil passage plate 3 to be mounted, a hydraulic transmission device in which the hydraulic pump P and the hydraulic motor M are substantially orthogonal to each other is obtained. You can do it. When such a hydraulic power transmission device is used, for example, as an axle drive device of a vehicle equipped with a vertical type engine, there is no need to interpose a bevel gear device in a power transmission path, thereby simplifying the power transmission unit. In addition, the size of the axle case can be reduced.

Second, the cylinder block 7 of the hydraulic pump P and the cylinder block 20 of the hydraulic motor M are
One oil passage plate 3, which is rotatably mounted on a surface, is formed by connecting crescent-shaped oil passages 3c and 3d and crescent-shaped oil passages 3m and 3n to each other via a pair of linear oil passages 3e and 3f. Therefore, when casting is manufactured by die casting or the like, the oil passages 3e and 3f can be simultaneously formed by a punching die, so that the processing is simplified and the manufacturing can be performed at low cost.

Third, the hydraulic pump P, the hydraulic motor M, and the oil
The main part of the HST transmission is constituted by the road plate 3
The construction of a high-pressure oil passage only between these
Since it suffices to be formed, these HST type transmission instrumentation in a different location
The oil passage plate 3 is mounted on the axle drive
Can be fixed to the case of
It is not necessary to increase the accuracy throughout the assembly process.
It has become worse.

[Brief description of the drawings]

FIG. 1 is a side view of a small tractor provided with an axle drive device of the present invention.

FIG. 2 is a cross-sectional plan view of the axle drive device.

FIG. 3 is a side sectional view of the same.

FIG. 4 is a front sectional view of the same.

FIG. 5 is a sectional side view of a pump shaft.

FIG. 6 is a perspective view of a movable swash plate.

FIG. 7 is a plan sectional view of an oil passage plate.

FIG. 8 is a perspective view of the same.

FIG. 9 is a sectional view of a slide rod portion.

FIG. 10 is a view showing another embodiment of the operation unit of the movable swash plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Axle case 1a Half upper case 1b Half lower case 3 Oil passage plate 3b Pump mounting surface 3c, 3d, 3m, 3n Crescent oil passage 3e, 3f Horizontal oil passage 3i Motor mounting surface 3p, 3q Suction port 5 Motor shaft 6 pump shaft 11 operating shaft 12 movable swash plate 13 axle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 39/04-39/20 F16H 47/02

Claims (1)

(57) [Scope of request for utility model registration] 1. A cylinder block 7 of a hydraulic pump P,
The hydraulic motor M of the cylinder block 20, and a single oil passage plate 3 attached to the two faces times <br/> freely rolling, the rotational axis of both the cylinder block 7, 20 is substantially orthogonal to each other mounted Preferably, the pump mounting surface 3b and the motor mounting surface 3
i are provided on two mutually orthogonal surfaces of the oil passage plate 3, respectively, and the crescent oil passages 3c and 3d opened on the pump mounting surface 3b, and the crescent oil passages 3m and 3n opened on the motor mounting surface 3i. Is drilled in the oil passage plate 3
Is parallel to the motor mounting surface 3b and orthogonal to the motor mounting surface 3i.
A hydraulic transmission device which is interconnected by a pair of linear oil passages 3e and 3f .