JPH0518183Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a HST type transmission used as a transmission of a traveling vehicle, in which the direction of the pump shaft of a hydraulic pump can be changed.

(b) Prior Art Conventionally, a technique for arranging a hydraulic pump and a hydraulic motor in a perpendicular state has been known as disclosed in Japanese Utility Model Application Publication No. 47-25681.

In addition, in other conventional techniques, there is a known technique in which a mounting base is placed between a hydraulic pump and a hydraulic motor, and the mounting base is replaced with one of various shapes to change the mounting position of the hydraulic pump or hydraulic motor. It is being done. For example, JP-A-61-
This is similar to the technology described in Publication No. 48661.

In addition, in other conventional techniques, a technique is known in which a HST type transmission is provided as a transmission for a traveling vehicle. For example, US Patent No.
As shown in the specification of No. 4513834.

However, in this conventional technology, the axes of the hydraulic motor and the hydraulic pump face in the same direction, making it impossible to change the direction of power transmission from the engine.

(c) Problems to be solved by the invention The purpose of the invention is to adjust the hydraulic pressure in response to changes in the direction of the engine crankshaft or the orientation of the axle case in a running vehicle. This allows the pump P to be driven.

For this purpose, the motor shaft 11 of the hydraulic motor M and the pump shaft 9 of the hydraulic pump P are not arranged in parallel but are arranged orthogonally, and the hydraulic pump attached to the wall of the hydraulic motor is rotated. It can be installed with.

Of course, the motor shaft 11 and the pump shaft 9 can be installed in a similar manner even if they are arranged in parallel.

(d) Means for solving the problem The purpose of the present invention is as described above, and next, the configuration for achieving the purpose will be explained.

This is an HST type transmission in which a hydraulic pump P and a hydraulic motor M are mounted so that the axes of the pump shaft 9 and motor shaft 11 are substantially orthogonal to each other, and the hydraulic pump P is mounted on the mounting surface 6a. The oil holes E, F, G, and H for connecting the hydraulic pump P and the hydraulic motor M in a closed circuit are installed in a circle centered on the motor axis. They are arranged around the circumference.

(E) Embodiment The purpose and structure of the present invention are as described above. Next, the structure of an embodiment in which the pump shaft 9 and the motor shaft 11 are orthogonal to each other as shown in the attached drawings will be explained.

In FIG. 1, an engine E has a horizontal output shaft, and an output pulley 3 is fixed to the output shaft. The pump shaft 9 of the hydraulic pump P is also arranged horizontally, and the V-belt 5 is wound between it and an input pulley 4 attached to the pump shaft 9 arranged horizontally.

The front wheel 1 is a driving wheel, and the axle 1 of the front wheel 1 is
9 protrudes from the transmission case k. A hydraulic motor M is disposed on the side wall of the transmission case K, either externally or internally, while the hydraulic pump P is externally mounted and is rotatable on the mounting surface, with the direction of the pump shaft 9 This makes it possible to change.

The rear wheel 2 is configured as a steering wheel.

Between the front wheel 1 and the rear wheel 2, there is a Mitsudmore device.
It is configured such that it is possible to attach the front mower device R' or to attach the front mower device R in front of the front wheel 1.

In the present invention, only the direction of the pump shaft 9 can be changed by changing the arrangement of the transmission case K and the engine E.

In the embodiment shown in FIG. 2, the pump shaft 9 is arranged horizontally in case the crankshaft of the engine E is horizontal or the output shaft is horizontal. A hydraulic motor M is fixedly mounted on the upper surface of the mission case K, and a hydraulic pump P is further attached to the upper surface of the hydraulic motor M.

Therefore, there is also a feature that the position of the axle 19 is lower than the position of the pump shaft 9.

Furthermore, when the horizontal crankshaft of the engine E is arranged facing rearward as shown in Fig. 3, the hydraulic pump P is 90 A simpler power transmission structure can be achieved by rotating the pump shaft 9 in the horizontal direction, directing the pump shaft 9 toward the engine E, and connecting the pump shaft 9 with the joint shaft 20.

In the configurations shown in FIGS. 4 to 7, a hydraulic motor M is attached to the side of the transmission case K, and a hydraulic pump P is also attached to the side of the hydraulic motor M.
It is configured so that it can be attached.

In the case of this configuration, since both the hydraulic motor M and the hydraulic pump P are located within the vertical width of the transmission case K, there is no risk of lowering the vehicle height of the traveling vehicle.

In the case of Fig. 4, the pump shaft 9 is arranged vertically, and the input pulley 4 is horizontal, so it is effective when the pump shaft 9 of the engine E is vertical, and in this case, the V belt 5 is also installed horizontally.

In the case of the embodiment shown in FIG. 5, the hydraulic pump P in the state shown in FIG. 4 is rotated 90 degrees in a vertical plane to make the pump shaft 9 horizontal and face the engine E.

In this case, it can be connected to the crank of the engine E via the joint shaft 20.

In the case of Fig. 6, the hydraulic pump P in the state shown in Fig. 5 is further rotated 90 degrees in the vertical direction, the crank is configured vertically downward, and the output pulley 3 is also arranged horizontally. , the V-belt will be stretched under the transmission case K.

In this case, it is effective when there is no gap between the transmission case K and the vehicle body and the V-belt 5 cannot be stretched.

In the embodiment shown in FIG. 7, the hydraulic pump P in the state shown in FIG. 6 is further rotated by 90 degrees, so that the pump shaft 9, which is a horizontal shaft, is directed toward the axle 19.

A vertical input pulley 4 is fixed to the pump shaft 9, and a horizontal crankshaft of the engine is disposed above the input pulley 4.

In this case, a configuration in which the engine E and the transmission case K are arranged one above the other is effective.

Next, in FIGS. 8 and 9, in the fixed part of the hydraulic motor M and the hydraulic pump P, the hydraulic pump P
A configuration in which the position of can be rotated and fixed in 90 degree increments will be explained.

First, the hydraulic pump P is composed of a pump case 7 and a case lid 12, and the hydraulic motor M side of the pump case 7 is configured as a pump mounting surface 7a.

The pump shaft 9 of the hydraulic pump P and the pump mounting surface 7a are arranged in parallel.

An oil path plate 6 is placed between the pump mounting surface 7a and the mounting surface 10a of the motor case 10 of the hydraulic motor M.
is being held and interposed.

The hydraulic pump P has a rotor 14 fixedly attached to the outer periphery of the pump shaft 9 in an interior formed by a case lid 12 and a pump case 7, and as the rotor 14 rotates, the rotor 14 is fitted into a cylinder hole of the rotor 14. A piston 15 is housed in a protruding manner along the slope of the swash plate 13 and discharges pressurized oil.

By changing the inclination angle of the swash plate 13 by rotating the swash plate rotation shaft 8, the discharge amount and the discharge direction are changed.

Further, the hydraulic motor M has a rotor 17 and a piston 18 in a cylinder hole in the rotor 17 arranged inside the motor case 10, and pressure oil from the hydraulic pump P flows into the cylinder hole in the rotor 17. As a result, the piston 18 protrudes while in contact with the swash plate 16, so that rotational force of the rotor 17 is generated.

Next, the configuration of the oil passage will be explained.

The side of the oil passage plate 6 and the mounting surface 6a is the pump mounting surface 7a.
and the mounting surface 6b is the mounting surface 10a.
It is constructed on the joint surface with the

On the mounting surface 6a side of the oil passage plate 6, there are oil holes E,
F, G, and H are open, and as shown in FIG. ing.

Further, there is no rotational replacement between the oil passage plate 6 and the motor case 10, and the oil holes E and H communicate with the arcuate oil passage 27 of the motor case 10 via the communication passage 28. Oil holes G and F are communication path 2
It communicates with the arc-shaped oil passage 26 of the motor case 10 via 9.

And the arc-shaped oil passage 26 of the motor case 10,
27 communicates with the cylinder hole of the hydraulic motor M.

Since the four oil holes E, F, G, and H are opened at 90 degree intervals, even if the hydraulic pump P is opened to 90 degrees, the oil passage 24 on the hydraulic pump P side is always open.
25 is connected to the oil passage 2 on the hydraulic motor M side via two of the oil holes E, F, G, and H and communication passages 28 and 29.
6 and 27, a closed circuit is formed.

In this case, when the hydraulic pump P is installed in the four positions, the combinations of the closed circuits are reversed at two locations, so the rotation of the swash plate rotating shaft of the hydraulic pump P is
Forward rotation and reverse rotation are reversed at every two locations.

That is, as shown in FIG.
The pressure oil discharged from the cylinder hole of the rotor 14 is communicated with the oil passages 24 and 25 shown in FIGS. 11 to 14 through the communication passages 30 and 31 through the oil passage in the pump case 7. It is.

Even if the hydraulic pump P is rotated every 90 degrees, the oil passage 2
4 and 25 correspond to any of the oil holes E, F, G, and H, thereby forming a closed circuit between the hydraulic pump P and the hydraulic motor M.

Then, so that the position of the hydraulic pump P can be rotated every 90 degrees and installed, the bolt holes A, B, C, and D of the oil passage plate 6 are arranged at the positions of the vertices of the square, and matched with these positions. The bolt holes a, b, c, and d of the pump mounting surface 7a are also opened at the apex positions of the same square.

Therefore, the bolt holes a, b, on the side of the pump mounting surface 7a,
Even if c and d are moved by 90 degrees, the pump mounting surface 7a and the mounting surface 6a can always be fastened together.

(f) Effects of the invention Since the invention is constructed as described above, it has the following effects.

First, the transmission case K and the hydraulic motor M can remain in the same position, and only the hydraulic pump P can be moved in 90 degree increments.
When the mounting position of the input pulley 4 is changed, the position and direction of the input pulley 4 can be changed accordingly.

Second, by arranging the motor shaft 11 of the hydraulic motor M and the pump shaft 9 of the hydraulic pump P in a perpendicular state, the position of the pump shaft 9 with respect to the motor shaft 11 can be changed in a variety of directions. It has become possible to do so.

[Brief explanation of the drawing]

Fig. 1 is a side view of a traveling vehicle equipped with an HST type transmission, and Fig. 2 is an embodiment in which a hydraulic motor M is arranged on the upper surface of a transmission case K, and a hydraulic pump P is arranged overlappingly above it. Perspective view, Figure 3 is the second
A perspective view of a state in which the hydraulic pump P is rotated 90 degrees horizontally from the state shown in the figure, FIG. 4 is a perspective view of an embodiment in which the hydraulic motor M is arranged on the side of the transmission case K, and FIG. Figure 4 is a perspective view of the hydraulic pump P rotated 90 degrees from the position shown in Figure 5. Figure 6 is a perspective view of the hydraulic pump P rotated further 90 degrees from the position shown in Figure 5. Figure 7 is the state shown in Figure 6. A perspective view of the state rotated further 90 degrees from
FIG. 8 is a side sectional view of the attached state of the hydraulic motor M and the hydraulic pump P, FIG. 9 is a partial sectional view of the other side,
10 is a sectional view taken along the line AA in FIG. 9, and FIGS. 11 to 14 are sectional views taken along the line BB in FIG. 8 with the mounting surface 7a of the hydraulic pump P rotated. P...Hydraulic pump, M...Hydraulic motor, A,
B, C, D... Bolt hole, a, b, c, d... Bolt hole, E, F, G, H... Oil hole, K... Mission case, 6... Oil road plate, 7... ...Pump case, 8...Swash plate rotating shaft, 9...Pump shaft, 10...
...Motor case, 11...Motor shaft, 12...Case lid.

Claims (1)

[Scope of utility model registration request] This is an HST type transmission in which a hydraulic pump P and a hydraulic motor M are mounted so that the axes of the pump shaft 9 and motor shaft 11 are substantially orthogonal to each other, and the hydraulic pump P is mounted on the mounting surface 6a. The oil holes E, F, G, and H for connecting the hydraulic pump P and the hydraulic motor M in a closed circuit are installed in a circle centered on the motor axis. The HST type transmission is characterized by being arranged on the circumference.