JPS5928755B2 - Valve device for gerotor type fluid rotating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a valve system for use in a gerotor-type fluid rotary machine, commonly known as a gerotor, having an eccentric gear meshing mechanism for creating expansion and compression of an incoming fluid.

Conventionally, in a gerotor-type fluid motor or fluid pump, a stator having internal teeth is eccentrically engaged with a rotor having one fewer tooth than the internal teeth of the stator, and the rotor rotates eccentrically, so that the teeth between the stator and the rotor are An expanding gap and a contracting gap are formed in between.

When used as a motor, hydraulic pressure is supplied to the expanding cavity (hereinafter referred to as the expansion cell) to give rotational force to the rotor, and when used as a pump, hydraulic pressure is supplied from the cavity that contracts (hereinafter referred to as the contraction cell). I'm taking it out.

In this case, a rotary valve device is used that switches the oil passage in response to the revolution of the rotor.

In such a valve device, in the commutator that revolves to switch and form an oil path to the gerotor section, the communicating pressure fluid causes a phenomenon in which fluid leaks from the high pressure side to the low pressure side through the contact gap of the commutator chamber. How to solve this leakage without interfering with the rotational movement of the commutator is a technical issue in order to achieve highly efficient pressure conversion.

In view of the above circumstances, the inventors of the present application filed a patent application in 1978-678.
The invention according to No. 63 proposes a valve device having a new structure.

This invention was made as an improvement on the invention related to the above patent application, and aims to simplify the valve structure, reduce manufacturing costs, and improve reliability without deteriorating the performance seen in the above invention. In addition, the present invention provides a valve device for a gerotor-type fluid rotary machine, which is provided with means for connecting a drive shaft and a cam member that can follow changes in the amount of eccentricity of the rotor.

Preferred embodiments of the valve device of the present invention will be described below with reference to the drawings, taking a gerotor type hydraulic motor as an example.

It goes without saying that the gerotor type hydraulic pump also has the same configuration.

FIG. 1 is a sectional view showing an embodiment of the valve device of the present invention, with the gerotor portion omitted.

In the figure, a drive shaft 1 is used to cause a commutator of a valve device to revolve, and is rotated by hydraulic pressure applied to a gerotor section and outputs its rotation.

A spline 2 formed on the valve device side of the drive shaft 1 meshes with an internal spline of a rotor (not shown) of the gerotor portion, and receives the rotational movement of the rotor with respect to the stator.

In the pin hole 1a provided in the axial direction at the end of the drive shaft 1,
A pin 3 is inserted, and the pin 3 mechanically connects the cam member 4 of the valve device and the drive shaft 1 , and the revolution of the drive shaft 1 is transmitted to the cam member 4 .

The cam member 4 is, as shown in FIG. , 8 central axis X
- It is eccentric by l with respect to X.

An oval receiver 6a is provided at the end of the shaft portion 6 in the axial direction, and the center 02 of the major axis of the receiver 6a is offset by t with respect to the center 01 of the shaft portion 6. And both centers 01,02
A line 01-02 connecting the two is offset by 98 from the center line Z-Z in the eccentric direction of the eccentric cam 7, which passes through the center 01 of the shaft portion 6.

Referring again to FIG. 1, the cam member 4 is attached to the wear plate 10 and head plate 12 via bearings 5, 5a so that the center line XX of the cam member 4 and the center axis XX of the shaft portions 6, 8 coincide with each other. It is rotatably supported.

The drive shaft 1 is connected to the receiver 6a of the cam member 4 with a constant inclination with respect to the center line XX due to the revolution of the rotor of the gerotor section. The pin 3 can be displaced within the receiver according to the inclination of the drive shaft 1, since the pin 3 has a certain degree of whiteness.

A commutator 15 is rotatably fitted into the eccentric cam 7 of the cam member 4, and on both sides of the commutator 15,
As shown in FIG. 3, annular grooves 29 and 30 are respectively formed, and both annular grooves 29 and 30 are communicated with each other through a plurality of through holes 31.

The cam member 4 and the commutator 15 constitute the movable part of the valve device, and the fixed members that form the commutator chamber and the oil passage for these movable parts are the wear plate 10, the sand plate 11,
The commutator ring 13 and the head plate 12 are housed in the casing 9, and the commutator ring 1
A commutator chamber 32 in which the commutator 15 rotates is formed by the sand plate 11 and the head plate 12 which are arranged on both sides of the sand plate 11 and the head plate 12 with the sand plate 11 interposed therebetween.

Note that the wear plate 10 and the sand plate 12 may be constructed integrally.

The wear plate 10 and the sand plate 11 are housed in a twisted casing 9 that is aligned by positioning pins 14, and has a bearing hole in its center that supports the shaft portion 6 of the cam member 4 via a bearing 5, and is connected to the gerotor portion. commutator 1
5. This provides a communication path connecting between the

That is, the passages are provided with a number corresponding to the interdental gaps formed between the stator and rotor in the gerotor section, and further communicated with an external fluid pressure source so that the passages are connected to the gerotor section as the commutator 15 revolves. A first passageway is in constant communication with the transitioning expansion cell, and a second passageway is also in constant communication with the contraction cell.

For example, if the number of internal teeth of the stator in the gerotor section is 7, and the number of teeth of the rotor is 6, which is one less,
There are seven interdental spaces.

The wear plate 10 has seven holes 16 indicated by broken lines at equal intervals corresponding to the interdental spaces, and the wear plate 10 is further provided with oil passages 17, 1B.

As shown in FIG.
The hole 21 has an opening facing the hole 16 of the hole 2.
1 has a door-shaped opening 23 stepped down toward the center on the commutator side.

Further, a hole 24 with a concentric diameter is provided in the sand plate 11 facing the oil passage 18 of the wear plate 10, and
The oil passage 17 of the wear plate 10 is connected to the sand plate 11.
A radially oblong opening 25 is provided opposite the commutator side, which communicates with an annular groove 26 provided inside the door-shaped opening 23 of the hole 16, which is shown in broken lines.

The commutator ring 13 is a cylindrical ring member, and the inner cylinder has an inner diameter sufficient for the commutator 15 to revolve around the eccentric cam 7, and the axial thickness has a dimensional tolerance slightly larger than the thickness of the commutator 15. The end face is precisely machined.

This commutator ring 15 plays an important role in determining the spacing between the sand plate 11 and the head plate 12 arranged on both sides of the ring to form a commutator chamber 32 in which the commutator 15 is housed.

The head plate 12 is a disc-shaped member having a bearing hole in the center into which the shaft portion 8 of the cam member 4 is inserted via a bearing 5a.

A commutator ring 13 and a sand plate 1 are connected to the stator of the gerotor section via this head plate 12.
1 and the casing 9 that fastens the wear plate 10,
In forming the commutator chamber 32, the connection between each member is strengthened, the commutator 15 is rotated smoothly depending on the thickness of the commutator ring 13, and the gap between the contact sliding surfaces is kept constant to ensure pressure in the commutator portion. In order to minimize oil leakage, a ring-shaped abutting surface 34 is provided on the inner surface of the end.
It is equipped with 36.

That is, the abutment surface 34 is provided facing the vicinity of the central axis of the head plate 12 to regulate the size of the surface facing the commutator 150, while the abutment surface 36 is provided opposite to the vicinity of the central axis of the head plate 12.
is provided facing the end face of the gerotor, and serves to concentrate the tightening force applied to the gerotor by bolts or the like onto the abutment surface 36.

Therefore, if each member is tightened by the casing, a constant rotational clearance determined by the tolerance between the thickness dimensions of the commutator ring 13 and the commutator 15 can be maintained.

Next, the switching operation for the gerotor portion due to the revolution of the commutator 15 in the valve device of the present invention will be described.

First, the communication with the outside for the commutator 15 is the first
As shown in the figure and FIG.
3) → (hole 16 of wear plate 10) to the first communication path leading to the expansion cell of the gerotor section, and from oil passage 17 (oblong opening 25 of sand plate 11) → (annular groove of sand plate 11) 26) → (Annular groove 29 of commutator 15) → (Sector-shaped opening 23 of sand plate 11)
→ (hole 16 of wear plate 10) and a second communication path leading to the contraction cell of the gerotor section.

The first and second communication paths are always maintained even when the commutator 15 revolves.

Since this embodiment uses a hydraulic motor as an example, an external hydraulic supply source is connected to the first
from the commutator chamber 32 provided on the outer periphery of the commutator 15 to the hole 2 of the sand plate 11.
1 and the hole 16 in the wear plate 10 to the expansion cell of the gerotor section, causing the rotor to revolve.

The oil discharged from the contraction cells of the gerotor section is drained through the other holes 16. of the wear plate 10 and the sand plate 11.
21 to the annular groove 29 of the commutator 15, and the second
It is led to the drain oil tank through the communication path.

In order to operate as a hydraulic pump, when the drive shaft 1 is rotated by an electric motor or the like, the rotation of the commutator 15 draws force into the first communication passage communicating with the expansion cell of the gerotor section, causing contraction of the gerotor section. High pressure oil is discharged from a second communication path communicating with the cell.

As explained above, according to the valve device for a gerotor-type fluid rotary machine of the present invention, by using an eccentric cam to cause the commutator to revolve, it is possible to relatively easily form a fluid passage for the commutator, and The commutator chamber in which the valve revolves is not directly formed by the casing, but is fixedly formed by intervening the head plate and being tightened by the casing, so even if the inflow pressure to the valve device is higher than the discharge pressure, the lid does not have the opposite effect. The gap on both sides of the commutator can be maintained constant, and fluid leakage from the high-pressure side to the low-pressure side in the valve device can be greatly reduced by simply increasing the machining accuracy for obtaining the thickness of the commutator and commutator ring. By simplifying the structure, we were able to reduce manufacturing costs and improve reliability.

However, in the present invention, the cam member that transmits the revolution of the drive shaft to the commutator is provided with an oval receiver, and the longer diameter direction of the original receiver is shifted by 96' with respect to the eccentric direction of the cam, so that a certain amount of Drive shafts that revolve with an inclination can be connected with a degree of freedom.

However, even if the teeth of the rotor are worn to some extent and the amount of eccentricity changes, it can be followed, so it can be used for a long period of time.

Furthermore, in order to change the volume of the motor or pump, it is necessary to use rotors with different tooth depths and thicknesses, and the amount of eccentricity of the rotor also changes accordingly.

Even in such a case, the cam member can be used in common, so the effect is extremely effective.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of an embodiment of the present invention, Fig. 2 is an embodiment of a cam member, where a is a front view, b is a right side view, C is a left side view,
Fig. 5 shows an embodiment of the commutator, a is a plan view, b is a sectional view taken along line A-A, and Fig. 4 is an embodiment of the sand plate.
A is a bottom view, b is a top view, and C is a BB cross-sectional view thereof.

Claims (1)

[Scope of Claims] 1. A gerotor section comprising a rotor and a stator as main bodies, a drive shaft having a pin hole at an end for transmitting revolution of the rotor, and a passage communicating the gerotor section and a commutator chamber. It consists of a fixed member, a commutator disposed in a commutator chamber formed by the fixed member and a head plate, and a cam member that transmits revolution of the drive shaft to the commutator, and the cam member has the fixed member at both ends. and an eccentric cam provided between a shaft portion supported by a helad plate and both shaft portions, and one end of the shaft portion is provided with a major diameter direction deviated by 9θ from the eccentric direction of the eccentric cam. The commutator is provided with an oval receiver whose major diameter center is offset from the center of the shaft portion, and the commutator connects the pin hole of the drive shaft with the receiver with a pin. the commutator chamber in the commutator ring, which is rotatably fitted in the commutator ring and has an annular groove that communicates with both surfaces, is interposed between the fixing member and the head plate, and has a defined thickness in the axial direction; a fixed rotation clearance is maintained between the fixing member and the head plate, and the passages of the fixing member individually communicate with the annular groove of the commutator and the outer circumferential commutator chamber of the commutator; The head plate is fastened together with the fixing member and the commutator ring by a casing having a perforated surface formed on the inner surface of the end portion corresponding to a position facing the axis of the eccentric cam and a position facing the commutator ring. Valve device for gerotor type fluid rotating machine.