JPH0350296Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a hydraulic motor that rotates the inner rotor of a trochoid gear using hydraulic pressure to generate torque.

(Prior art) Fig. 5 shows a hydraulic motor according to US Pat.
and 4 are formed.

Both of these communication groove groups 3 and 4 keep their tips at intermediate positions of the valve body 2, and one communication groove group 3 communicates with the low pressure port 5.
The other communication groove group 4 communicates with the high pressure port 6.

The valve body 2 configured as described above, while rotating integrally with the output shaft 1, guides the high pressure oil in the high pressure port 6 to the high pressure side of the trochoid gear 7, and returns the return oil on the low pressure side of the trochoid gear to the low pressure side. I am trying to route it to port 5.

(Problems to be Solved by the Present Invention) The conventional hydraulic motor as described above has a problem in that it is difficult to form the communication grooves 3 and 4 on the outer periphery of the valve body 2.

Therefore, as a solution to this problem, the
The invention published in Publication No. 55-34319 is known, but
This hydraulic motor has a problem in that high pressure acts on one side of the valve body, which increases the frictional force between the valve body and the inner rotor of the trochoid gear, which increases energy loss accordingly.

The purpose of this invention is to provide a hydraulic motor in which the valve body can be easily machined, and the pressure balance of the valve body is improved to reduce energy loss.

(Means for solving the problem) This invention provides a valve body that rotates integrally with the output shaft, and uses the rotational movement of this valve body to switch between a high-pressure oil path and a low-pressure oil path, and The present invention is based on a hydraulic motor configured to apply oil to the inner rotor of a trochoid gear to rotate the inner rotor and extract its torque.

Based on the above-mentioned hydraulic motor, the valve body of this invention has multiple oil passages parallel to the axis that open to the side opposite to the trochoid gear, and a high-pressure port on the outer periphery of the valve body. A high-pressure annular groove that constantly communicates with the trochoidal gear, and a low-pressure annular groove that constantly communicates with the low-pressure port are formed, and the high-pressure annular groove and the low-pressure annular groove are alternately communicated with the plurality of oil passages, while facing the trochoid gear. An annular recess is formed on the inner surface of the housing, and an elastic body and a sealing member are installed in this annular recess in order, and the opening of the oil passage is sealed with the sealing member, and the high pressure from this oil passage is applied to both sides of the valve body. It is characterized by a structure that acts on

(Operation of the present invention) The high pressure that has flowed into the oil passage acts on both axial sides of the valve body, so this hydraulic pressure causes the valve body to float.

Further, since the force of the elastic body is applied to the valve body through the sealing member, even if the valve body has a dimensional error or changes in size due to thermal expansion, it can be absorbed.

(Effects of the Present Invention) Since the present invention is constructed as described above, the hydraulic pressure in the axial direction against the valve body becomes uniform, and energy loss due to an increase in frictional force can be reduced.

Further, since it is only necessary to form the high-pressure annular groove and the low-pressure annular groove on the outer periphery of the valve body, the groove processing becomes easy.

Furthermore, even if there is a dimensional error in the valve body, the elastic body absorbs it, making it easier to manage the dimensions of the valve body. Furthermore, since this elastic body also absorbs dimensional changes due to thermal expansion of the valve body, it is possible to eliminate problems such as seizure caused by the dimensional changes.

(Embodiment of the present invention) A plate 12, a trochoid gear G, and a cover 13 are attached in this order to one side of the housing 11 of this embodiment, and these are integrally fastened with bolts 14.

Bearing 15 provided in the housing 11
At the inner end of the output shaft 16 rotatably supported by
A recess 17 is formed, and a spline 18 is formed within this recess 17.

The trochoid gear G is composed of a trochoid outer 19 and an inner rotor 20, and the number of teeth of the inner rotor 20 is one less than that of the trochoid outer 19, and a spline is formed in the center of the inner rotor 20. 21 is formed.

Then, the output shaft 16 and the inner rotor 20
Splines 23 and 24 are formed at both ends of the drive shaft 22 that connects the
4 is engaged with the spline 18 of the output shaft 16 and the spline 21 of the inner rotor 20.

Therefore, if the inner rotor 20 rotates while revolving around the trochoid outer 19,
The output shaft 16 will rotate.

A valve body V is rotatably housed in the housing 11 as described above, and a convex portion 2 formed on the output shaft 16 is inserted into a notch 25 formed in the valve body V.
6 are engaged with each other, so that the valve body V rotates integrally with the output shaft 16.

The valve body V configured as described above has one side surface in sliding contact with the plate 12, and the other side surface is supported by the housing 11.

However, an annular recess 27 is formed in a portion of the housing 11 corresponding to the other side surface,
An elastic body 28 and a sealing member 29 are placed in this annular recess 27.
And the decor. Therefore, the elastic body 28 can absorb dimensional errors in the axial direction of the valve body V and wrinkles caused by thermal expansion due to temperature changes.

The valve body V has a plurality of oil passages 30 and 31 parallel to the axis.
0 and 31 are communicating holes 32 and 3 that pass through the valve body V and have one opening formed in the plate 12.
3, and the other opening is aligned with the seal member 2.
I have it close to 9.

Furthermore, a high pressure port 3 is provided on the outer periphery of the valve body V.
4 and the low pressure annular groove 35 communicating with the low pressure port 3.
6 is formed, and seals 38 to 40 are installed in seal grooves formed on both sides of these annular grooves 35 and 37, so that both annular grooves 35 and 37 do not communicate with each other. That's what I do.

Then, the high pressure annular groove 35 is connected to one oil passage 30.
group, and the low pressure annular groove 37 is connected to the other oil passage 31.
It communicates with the group.

Although the port and the annular groove have been described as being divided into low pressure and high pressure, the pressure relationship is reversed depending on the rotational direction of the motor.

When high-pressure oil is supplied from the high-pressure port 34, the high-pressure oil passes through the high-pressure annular groove 35 → predetermined oil passage 30 → the communication hole 32 of the plate 12.
As shown in FIG. 4, a chamber 41 consisting of a trochoid outer 19 and an inner rotor 20
At the same time, the hydraulic oil in a chamber 42 other than this chamber 41 is supplied to the communication hole 33→
The oil flows out from the low pressure port 36 via the oil passage 31 → low pressure annular groove 37.

When high pressure oil is supplied to the chamber 41 as described above, the inner rotor 20 rotates in the direction in which the volume of the chamber 41 expands, that is, in the direction of the arrow 43, and transmits the rotational force through the drive shaft 22. It is transmitted to the output shaft 16.

In the process of rotating the output shaft 16 in this way, high pressure oil is introduced into one of the oil passages 30, but since this oil passage 30 is open on both sides of the valve body V, the high pressure is introduced into the valve body V. Acts on both sides of body V.

Since high pressure acts on both sides of the valve body V and the valve body V is brought into a floating state by hydraulic pressure, the frictional force of the valve body V is reduced, and the energy loss thereof is reduced.

In addition, since the force of the elastic body 28 is applied to the valve body V through the seal member 29 as described above, even if there is a dimensional error in the valve body V or a dimensional change due to thermal expansion, This can be absorbed and the sealing properties of the oil passages 30 and 31 can also be improved.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of this invention. Figure 1 is a cross-sectional view, Figure 2 is a cross-sectional view taken along the line - - in Figure 1, and Figure 3 shows a state in which the output shaft and valve body are separated. FIG. 4 is an operation explanatory diagram showing the relationship between the oil passage, the trochoid outer and the inner rotor, and FIG. 5 is a sectional view of the conventional type. G... Trochoid gear, 16... Output shaft, 19
... Trochoid outer, 20 ... Inner rotor, V ... Valve body, 30, 31 ... Oil path, 34 ...
High pressure port, 35...High pressure annular groove, 36...Low pressure port, 37...Low pressure annular groove.

Claims (1)

[Scope of utility model registration request] A valve body that rotates integrally with the output shaft is provided, and the rotation of this valve body switches between a high-pressure oil passage and a low-pressure oil passage, and the high-pressure oil is applied to the inner rotor of the trochoid gear. In a hydraulic motor configured to rotate and extract torque, the valve body has a plurality of oil passages parallel to the axis that open to the side opposite to the trochoid gear, and A high-pressure annular groove that constantly communicates with the high-pressure port and a low-pressure annular groove that constantly communicates with the low-pressure port are formed on the outer periphery, and the high-pressure annular groove and the low-pressure annular groove are alternately communicated with the plurality of oil passages. , an annular recess is formed on the inner surface of the housing facing the trochoid gear, an elastic body and a sealing member are sequentially attached to the annular recess, the opening of the oil passage is sealed with the sealing member, and high pressure from the oil passage is A hydraulic motor configured to act on both sides of the valve body.