JPS6053193B2 - Brake device in hydraulic motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brake device for stopping rotation of an output shaft of a hydraulic motor using a gerotor unit having a fixed ring.

A brake system for a hydraulic motor using a conventional gerotor unit is shown in FIG.

In FIG. 1, 1 is a casing, 2 is a gerotor unit, 3 is a ring of the gerotor unit, 4 is a rotor of the gerotor unit, 5 is an interlocking shaft, 6 is an output shaft, and 8 is an oil passage. The brake device shown in FIG. 1 has a plurality of internal friction plates 9 spline-coupled to an output shaft 6.
a slide ring 10 that slides along the axis of the output shaft 6;
A slide plate 1 is assembled with a plurality of external friction plates 13 spline-coupled to the slide plate 1 and fixed to the end of the slide ring 10.
4 is biased by a spring 11, and the internal friction plate 9 is moved to the external friction plate 13.
The brake is actuated by creating friction between the two, and high-pressure oil is supplied from the oil passage 8 to the working chamber 12 provided at the end surface of the piston 15 in contact with the slide ring 10. The slide plate 14 is moved in a direction opposite to the urging direction of the spring 11, thereby releasing the pressed state between the internal friction plate 9 and the external friction plate 13.

However, since hydraulic motors using this type of gerotor unit are generally small and have high torque, a brake device is installed directly on the output shaft 6 as described above to control its rotation. When trying to stop the output shaft 6
Since the torque is very large, a very large brake force is required, which has the disadvantage that the brake device is larger than the main body and the manufacturing cost is high. This invention solves the drawbacks of the conventional hydraulic motor brake device described above, and provides a hydraulic motor that can stop the rotation of the output shaft with a small brake force, making it possible to downsize the hydraulic motor and reduce manufacturing costs. The purpose of this invention is to provide a brake device for use in a vehicle.

The present invention provides a hydraulic motor in which a rotor having external teeth is disposed within a ring having internal teeth disposed in a casing, and the rotor rotates on its own axis and revolves in conjunction with the rotation. a friction plate connected to the rotor to rotate as the rotor revolves, and to prevent rotation of the rotor by blocking the rotation; The friction plate is also characterized in that it includes a mating plate which is provided so as to be movable toward and away from the friction plate, and prevents rotation of the friction plate by being pressed against the friction plate.

The present invention will be explained below based on embodiments shown in the drawings.

In this embodiment, the same reference numerals are given to the same parts as in the conventional one to simplify the explanation, and mainly new parts will be explained. Before entering into the description of the present invention, the operation of a hydraulic motor using a gerotor unit will be explained in order to facilitate understanding of the present invention. Figures 2 to 5 sequentially show the operating modes of the gerotor set 2, in which the number of internal teeth 3a of the ring 3 is 7.
, the number of external teeth 4a of the rotor 4 is six. The ring center 01 and the rotor center 02 are eccentric, and the inner teeth 3a of the ring 3 and the outer teeth 4a of the rotor 4 are meshed with each other. FIG. 2 shows the starting position of the rotor 4, in which high-pressure oil is introduced into chambers 5, 6, and 7 of the chambers formed by the ring 3 and the rotor 4, and the rotor 4 is connected to the ring 3.
It rotates in the direction in which the volumes of the chambers 5, 6, and 7 expand while being inscribed in the direction of the arrow A in FIG. 2 (hereinafter referred to as the RA direction).

At this time, the high-pressure oil is introduced by sequentially moving it to the chambers located in the direction of arrow B in FIG. 2 using a distribution valve (not shown). It will be done. Then, as shown in FIG.
, 3, the rotor 4 rotates 1/14 rotation in the A direction, and at this time the rotor center 02 moves around the ring center 01 as indicated by the arrow C in FIG. Direction (hereinafter referred to as Rc
It revolves in the direction 0) and moves to 02''.

Further, as shown in FIG. 4, when the high pressure oil is introduced into the chambers 4, 5, and 6, the rotor 4 rotates by 1/7 in the A direction.
Rotation is performed, and at this time, the center 02 of the rotor 4 is the ring center 0.
It revolves around 1 in the C direction and moves to O/''.
Furthermore, as shown in FIG.
7, the rotor 4 rotates 1/6 rotation in the A direction, and at this time the rotor center q revolves once in the C direction around the ring center 01, returning to the starting position. It's back to . Therefore, while the rotor 4 revolves around the ring center 01 once in the C direction, the rotor 4 rotates 1/6 rotation in the A direction. The output shaft 6 of the hydraulic motor is rotated by an interlocking shaft 5 whose one end is splined to the center of the rotor 4 and the other end splined to the output shaft 6, by which the torque generated by the rotor 4 is extracted. be done.

Therefore, during one rotation of the output shaft 6, the rotor 4 revolves around the ring center 01 six times.As explained above, in this invention, the number of revolutions of the rotor is equal to the number of rotations. This method utilizes the fact that the number of external teeth is multiplied by the number of external teeth, and therefore, the torque generated by revolution is 1/1 of the torque generated by rotation by the number of external teeth of the rotor, as shown in Figures 6 and 7 below. The configuration of the embodiment shown in FIG.
is rotatably attached via a bearing 22 so that its axis coincides with the center line of the ring 3.

The end 2 of this rotating shaft 21 on the mounting side of the gerotor unit 2
The center line of 1a is eccentric with respect to the axis of the rotating shaft 21,
Moreover, the center line of this end portion 21a (hereinafter referred to as eccentric portion 21a) is made to coincide with the center line of the rotor 4. Further, the eccentric portion 21a is rotatable relative to the rotor 4 by a bearing 23 provided on the inner peripheral portion of the rotor 4. A friction plate 24 is provided at the end of the rotating shaft 21 opposite to the mounting side of the gerotor unit 2 with respect to its support position, and is slidable in the axial direction and is attached to the rotating shaft 21 as shown in FIG.
It is attached through its center so that it cannot rotate.

Further, inside the casing 1, a mating plate 25 is provided at a side position opposite to the mounting position of the gerotor unit 2 of the friction plate 24.
is fixed opposite the friction plate 24 by a pin 26.

Furthermore, in the flesh part of the casing 1, a mating plate 2 is provided at a lateral position of the friction plate 24 on the mounting position side of the gerotor unit 2.
7 is attached by a pin 28 to face the friction plate 24 and to be movable in the axial direction of the rotating shaft 21, and furthermore, this mating plate 27 is mounted in a direction in which it is pressed against the friction plate 24 by a spring 29. is energized by The tip of a piston 30 is in contact with the edge of the side surface of the mating plate 27 on the biasing direction side of the spring 29, and a pressure chamber 31 provided at the rear of the piston 30 is supplied with pressure from an oil passage 32. The oil is being guided.

Next, the operation of the above brake device will be explained.

During operation of the hydraulic motor, the eccentric portion 21 of the rotating shaft 21
Since the center of a rotates around the axis of the rotating shaft 21 through the bearing 23 in conjunction with the revolution of the rotor 4, the torque generated by the revolution of the rotor 4 is extracted as the output torque of the rotating shaft 21, and the Therefore, the friction plate 24 is rotated at the same rotation as the revolution of the rotor 3.

At this time, pressure oil is introduced into the pressurizing chamber 31 from the oil passage 32, and the piston 30 pushes the mating plate 27 against the spring 29 in a direction opposite to its biasing direction, causing the friction plate 24 to move. By releasing the clamping pressure state caused by 25 and 27,
It is ready to rotate.

Next, when stopping the rotation of the output shaft 6, by stopping the introduction of pressure oil into the pressurizing chamber 31, the mating plate 27 is biased by the spring 29 and pressed against the friction plate 24, and The friction plate 24 is moved and pressed against the mating plate 25, and therefore the friction plate 24 is pressed against the mating plate 25.
Since the rotation of the friction plate 24 is stopped by contact friction, the rotation of the rotor 4 is stopped, and the rotation of the rotor 4 is stopped, and the rotation of the output shaft 6 is stopped.

The brake device for the hydraulic motor is configured as described above, so that when torque acts on the output shaft 6 from the outside, this torque is transmitted to the friction plate 24 via the interlocking shaft 5 and the rotating shaft 21. Due to the operation of the rotor 4, the direction of rotation of the rotating shaft 21 is opposite to that of the output shaft 6, and the torque becomes 1/the number of external teeth 4a of the rotor 4. Rather than installing a brake device, the rotation of the output shaft 6 can be stopped with a brake torque that is 1/the number of external teeth 4a of the rotor 4. In addition, the piston 30
By connecting the movable oil passage 32 with the oil passage 8 for driving the rotor 4, high-pressure oil is introduced from the oil passage 8 for driving the rotor 4 and at the same time, high-pressure oil is introduced into the pressurizing chamber 31. The piston 30 moves as the piston 30 is guided, the friction plate 24 becomes rotatable, and at the same time the introduction of high pressure oil from the oil passage 8 is stopped and the oil passage 32
The high-pressure oil is stopped from being introduced, and the rotation of the friction plate 24 can be automatically stopped.

8 to 12 show other embodiments in which the torque generated by the revolution of the rotor 4 is extracted from the rotating shaft 21. In FIGS. 8 and 9, a fitting hole 21b is provided at the center of the eccentric portion 21a. is provided in this fitting hole 21b,
A fitting protrusion 5a provided at the center of the end of the interlocking shaft 5 is loosely fitted.

In FIGS. 10 and 11, a fitting hole 5b is provided at the center of the end of the interlocking shaft 5, and the rotating shaft 21 is inserted into the fitting hole 5b.
In addition, in FIG. 12, unlike the embodiments shown in FIGS. 8 and 9, the end of the rotating shaft 21 is eccentrically fitted. There is no fitting hole 2 provided on the peripheral edge of the rotating shaft 21.
The fitting protrusion 5a of the interlocking shaft 5 is loosely fitted directly onto the interlocking shaft 1b. As described above, the brake device according to the present invention is of a type in which a rotor with external teeth is disposed within a ring provided with internal teeth and is disposed inside a casing, and the rotor rotates about its axis and revolves along with the rotation. In the hydraulic motor, a friction plate is connected to the rotor and rotates on its own axis as the rotor revolves, and the friction plate is configured to prevent rotation of the rotor by blocking the rotation, and the friction plate is disposed within the casing. By having a mating plate that faces the friction plate and is movable toward and away from the friction plate, and prevents rotation of the friction plate by being pressed by the friction plate, it is possible to directly connect to the conventional output shaft. It is possible to stop the rotation of the output shaft with a small brake torque that is 1/2 the number of teeth on the rotor compared to the attached brake device, so the brake device can be made smaller and the manufacturing cost of the hydraulic motor can be greatly reduced. This has the excellent effect of making a contribution.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional brake device, Figs. 2 to 5 are explanatory views showing the operating mode of the gerotor unit, and Fig. 6
The figure is a sectional view showing one embodiment of this invention, FIG. 7 is a cross-sectional view taken along the line ■-■ in FIG. 6, and FIG. 9 is a cross-sectional view taken along the line ■-■ in FIG. 8, and FIG. 10 is a cross-sectional view showing another embodiment of the connection portion between the interlocking shaft and the rotating shaft.
Figure 11 is a cross-sectional view taken along line 1 and 1 in Figure 10.
FIG. 2 is a cross-sectional view showing still another embodiment of the connecting portion between the interlocking shaft and the rotating shaft. 1...Casing, 2...Gerotor unit, 3.
...Ring, 4...Rotor, 5...Interlocking shaft, 6...
・Output shaft, 21...Rotating shaft, 23...Bearing,
24...Friction plate, 25...Mating plate, 27...Mating plate, 29...Spring, 30...Piston.

Claims (1)

[Claims] 1 Inside the ring with internal teeth placed inside the casing,
A rotor with external teeth is arranged, the rotor rotates on its axis,
In a hydraulic motor of a type that revolves as it rotates, the hydraulic motor is connected to the rotor and rotates as the rotor revolves;
A friction plate is arranged to prevent rotation of the rotor by preventing rotation of the rotor; A brake device for a hydraulic motor, comprising a mating plate that prevents rotation of a friction plate by being pressed against the plate.