JPH0316757Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention transmits engine driving force to drive wheels via a hydraulic pump and a hydraulic motor, and operates these hydraulic pumps and hydraulic motors. Concerning a hydraulic deflock mechanism.

<Prior Art> In general, as a differential lock mechanism, one that generates effective friction torque within a differential device, and one that uses a mechanical clutch mechanism are widely used. Examples of the former include, for example, a torque proportional type consisting of a multi-disc clutch friction mechanism and a cam mechanism of a differential pinion shaft, a pressurized type consisting of a spring and multi-disc clutch friction mechanism, or a cone clutch friction mechanism; There are systems that combine a torque proportional system, a pressurization system, and a no-spin differential system. In addition to this, various other features are used, including a ZF-type differential lock and a system that completely fixes the left and right drive wheels.

<Problems to be solved by the invention> In the case of the above-mentioned conventional differential lock mechanism, the number of parts increases due to the shape, space, and operation system of the differential device for maintenance, which requires a large amount of work, including in terms of service. In addition, vehicles with a deflock mechanism have a problem in terms of maneuverability (steering wheel steering).

<Means for Solving the Problems> The present invention was developed by focusing on the above-mentioned conventional problems, and instead of semi-forcibly locking the differential device, it uses hydraulic pressure to lock the differential device where necessary. By supplying the necessary amount of hydraulic flow to the vehicle, it eliminates the difficulty of maneuvering a vehicle with a differential lock.Also, by separating the drive system for the drive wheels, it is possible to easily escape in the event of a slip.
The present invention aims to provide a defrock mechanism that is small in size, allows for a wide interior space, reduces weight, and eliminates discomfort caused by drive, noise, etc. caused by conventional power transmission systems.

Therefore, the hydraulic differential lock mechanism of the present invention includes a hydraulic pump operated by the driving force of the engine, each hydraulic motor for the left and right drive wheels that is installed on the axle and operated by hydraulic pressure from the hydraulic pump, and each hydraulic It is equipped with a drive device consisting of a drive shaft for left and right drive wheels that are directly connected to a motor and driven via the hydraulic motor, and the hydraulic path to the hydraulic motor is connected to enable differential operation, and the left and right wheels can be independently configured to defrot. The structure is equipped with a switching valve to

<Example> An example of the present invention will be described below based on FIGS. 1 to 8.

FIG. 1 is a perspective view schematically showing a drive device for an automobile equipped with a defroster mechanism according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view of the drive device shown in FIG. 1 installed in the chassis of an automobile. 3 is a cross-sectional view thereof, FIG. 4 is a schematic explanatory diagram showing the hydraulic system in the differential state of the drive device, FIG. 5 is a schematic explanatory diagram showing the hydraulic system in the differential state, and FIG. FIG. 2 is a circuit explanatory diagram showing details of a hydraulic circuit.

In the figure, 1 is an engine, and 2a and 2b are rear wheels as driving wheels.
2b. engine 1
is a midship type mounted in the center of the frame 5 as shown in FIGS. 2 and 3. Besides this, it is also possible to use a front engine or a rear engine. The hydraulic pump 3 is
It is connected to the engine 1 via a clutch 6, and the torque of the engine 1 is controlled on and off by the clutch 6 to generate oil pressure. As this hydraulic pump 3, a dual hydraulic pump is adopted.
The hydraulic motors 4a and 4b are provided on a rear axle (not shown) and are operated by the hydraulic pressure from the hydraulic pump 3, and drive the left and right rear wheels 2 as driving wheels.
One each is provided corresponding to a and 2b. These hydraulic motors 4a, 4b are directly connected to the drive shafts 7a, 7b of the left and right rear wheels, and separately and independently transfer the driving force of the engine 1 to the drive shafts 7a, 7.
b. For example, an orbit motor can be used as the hydraulic motors 4a, 4b. Note that 8 is a pipe such as a medium-pressure rubber hose that guides hydraulic pressure from the hydraulic pump 3 to the hydraulic motors 4a and 4b.

Also, in the middle of the piping 8 leading from the hydraulic pump 3 to the hydraulic motors 4a, 4b, there are forward/reverse switching valves 9a, 9, corresponding to the hydraulic motors 4a, 4b, respectively.
b are provided, and these forward/reverse switching valves 9a, 9
By switching operation b, the left and right rear wheels 2a and 2b can move forward and backward at the same time, and one rear wheel 2a or 2b moves forward while the other rear wheel 2a or 2
It is also possible to drive the vehicle in forward and reverse directions at the same time, with b being in reverse.

Furthermore, a free-lock switching valve 10 for switching to a differential state or a deflock state is provided in the middle of the piping 8 from the hydraulic pump 3 to the forward/reverse switching valves 9a, 9b. The free-lock switching valve 10 connects the hydraulic paths to the hydraulic motors 4a and 4b to enable differential operation, and allows left and right to be independently deflocked, and constitutes a deflock mechanism. That is, the free lock switching valve 10 has a free port A for differential and a lock port B for deflock.
At the free port A, the pressure oil from the hydraulic pump 3 is combined and supplied to each hydraulic motor 4a, 4b, and at the lock port B, the pressure oil from the hydraulic pump 3 is not combined and is supplied to each hydraulic motor 4 separately.
It is designed to be supplied to a and 4b. Therefore,
When in the free port A position, more pressure oil is supplied to the hydraulic motor 4a, 4b which has a larger flow rate (for example, the hydraulic motor located on the outer peripheral side during turning), and a differential state is established. When the lock board is in the position B, the two systems of pressure oil from the hydraulic pump 3 are separately supplied to each of the hydraulic motors 4a and 4b, resulting in a deflock state.

In this way, the hydraulic pump 3, hydraulic motors 4a, 4
Since the left and right rear wheels 2a and 2b as drive wheels are driven through the drive wheel, a large power transmission system such as a transmission, propeller shaft, differential gear, etc. is not required, and the number of parts can be reduced accordingly. It is possible to reduce weight, and there is no need for parts that span the living space such as propeller shafts and differential gears, which allows for expansion of interior space, and also eliminates unpleasant sensations such as vibration and noise caused by the power transmission system. It is.

In addition, the free-lock switching valve 10 can be used to easily obtain a differential state and a differential state, which can solve the difficulty in maneuvering that is peculiar to conventional vehicles with a differential lock. By separating them, it will be easier to escape in the event of a slip.

Incidentally, reference numeral 18 is a brake valve that suppresses the rise in abnormal pressure in the reverse circuit that occurs when the operation is stopped, absorbs abnormal shock, and maintains the safety of the equipment.

<Effects of the invention> As explained above, the hydraulic differential lock mechanism of the present invention has a hydraulic pump operated by the driving force of the engine installed on the axle, and is compatible with left and right drive wheels operated by the hydraulic pressure from the hydraulic pump. It is provided with a drive device consisting of each hydraulic motor and a drive shaft for left and right drive wheels that are directly connected to each hydraulic motor and driven via the hydraulic motor, and a hydraulic path to the hydraulic motor is communicated to enable differential operation. Because it has a switching valve that enables left and right defrocking independently, instead of semi-forcibly locking the differential, it uses hydraulic pressure to supply the required amount of hydraulic flow to the required location, and the differential is activated. It solves the difficulty of driving a car, and by separating the drive system for the drive wheels, it becomes easier to escape in the event of a slip. Moreover, it is compact and has a large interior space, and it is possible to reduce weight, and This has the effect of eliminating unpleasant sensations such as vibration and noise generated from the power transmission system.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a drive device for an automobile equipped with a differential lock mechanism according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view of the drive device shown in FIG. 1 installed in the chassis of an automobile. 3rd plan view showing
4 is a schematic explanatory diagram showing the hydraulic system in the differential state of the drive device, FIG. 5 is a schematic explanatory diagram showing the hydraulic system in the differential state, and FIG. FIG. 3 is a circuit explanatory diagram showing details of a hydraulic circuit. 1... Engine, 2a, 2b... Left and right rear wheels as driving wheels, 3... Hydraulic pump, 4a, 4b...
Hydraulic motor, 7a, 7b...drive shaft,
10...Switching valve, A...Free port, B...
…Rockport.

Claims (1)

[Scope of utility model registration request] A hydraulic pump operated by the driving force of the engine, hydraulic motors for the left and right drive wheels installed on the axle and operated by hydraulic pressure from the hydraulic pump, and directly connected to each hydraulic motor and driven via the hydraulic motor. A hydraulic deflock mechanism is provided with a drive device consisting of a drive shaft for left and right drive wheels, and a switching valve that connects a hydraulic path to the hydraulic motor to enable differential operation and enables left and right independent deflock.