JP3080185B2 - Vane pump device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vane pump device, and more particularly to a vane pump device for reducing pressure fluctuation in a pressure transition section.
It relates to a device that reduces vibration and noise.

[0002]

2. Description of the Related Art A conventional vane pump has a configuration substantially as shown in FIG. FIG. 5 is a diagram showing a main part of the vane pump, in which a rotor 103 is fixed to a rotating shaft 101. A cam ring 105 is provided on an outer peripheral side of the rotor 103. A plurality of vanes 107 are attached to the outer periphery of the rotor 103 at a predetermined pitch, and these vanes 107 protrude and retract in the radial direction when the rotating shaft 101 and the rotor 103 rotate. Thereby, the working fluid, for example, the working oil is sucked
This is to pressurize and discharge. In the drawing, reference numeral 109 denotes a discharge port, and reference numeral 111 denotes a suction port.

In the meantime, in the vane pump having the above-mentioned structure, there is a problem that vibration during operation and noise due to the vibration are generated. This kind of vibration, the occurrence of noise, ejection from the suction pressure
A pressure transition section between suction and discharge where the pressure changes up to the output pressure,
Discharge-suction pressure where pressure changes from discharge pressure to suction pressure
Pressure fluctuations in the transition section are significantly related. Therefore, in the conventional case, the following measures are taken to smooth the pressure fluctuation in the pressure transition section.

First, a method of adjusting the amount of pre-compression and the amount of pre-decompression in the pressure transition section by adjusting the shape of the cam ring 105 to an appropriate shape is adopted. Separately, discharge ports 109, 109, suction port 11
To 1,111, respectively provided notches 113, through the cutout portion 113 is leaked pressure fluid definitive pressure transition section, thereby is also adopted a method of alleviating the pressure fluctuation.

[0005]

According to the above-mentioned conventional configuration, there are the following problems. That is, the cam ring 10
Even if a measure is taken to reduce the pressure fluctuation in the transition section by devising the shape of No. 5 or providing the notch 113, if the operating condition of the vane pump changes, it can no longer cope with it. Impossible
As a result, it is impossible to solve the generation of vibration and noise. To explain this in more detail,
For example, the pre-compression effect in the suction-discharge process determined by the shape of the cam ring 105 and the pre-decompression effect in the discharge-suction process are uniquely determined by the shape of the cam ring 105. However, in practice, when the discharge pressure increases, the pre-compression effect and the pre-pressure reduction effect need to be increased, and when the discharge pressure decreases, the pre-compression effect and the pre-pressure reduction effect need to be reduced. In addition to the change in the discharge pressure, the pre-compression effect and the pre-decompression effect need to be appropriately changed when the physical property value of the working fluid changes. However, in the conventional case, the operating condition as the adjustment target is fixed, and the cam ring 10 corresponding to the fixed operating condition is fixed.
Since the shape of No. 5 is set, it becomes impossible to cope with the change of the driving situation as described above.

In the case of a method in which a part of the pressure fluid is leaked by providing the notch 113, the notch 1
Depending on the size of the nozzle 13, the volumetric efficiency is reduced, and the pressure fluctuation caused by the pressure fluid ejected to the discharge port 109 increases. As a result, the provision of the notch 113 reduces the pressure fluctuation. The effect was limited.

The present invention has been made based on such a point, and an object of the present invention is to effectively reduce the pressure fluctuation in the pressure transition section and the generation of vibration and noise even when the operating condition changes. It is another object of the present invention to provide a vane pump device capable of preventing the above problem.

[0008]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
In particular, the present invention provides a rotor fixed to a rotating shaft,
A cam ring arranged on the outer peripheral side of the rotor
A plurality provided on the outer periphery and movably provided in the radial direction
Vanes and a plurality of vanes
And a housing formed by connecting the housing elements
Syringe for connecting multiple housing elements of a housing
And a plurality of cylinder mechanisms according to the operating condition.
To change the shape of the cam ring via the housing.
And control means for changing
is there.

[0009]

[Action] The invention connects a plurality of housing elements.
The cylinder mechanism is driven by the control means,
Therefore, the shape of the cam ring can be
It is to make it optimal according to the situation.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
I will tell. FIG. 1 is a diagram showing a main part of a vane pump device.
The rotor 3 is fixed to the rotating shaft 1. Above row
A cam ring 5 is provided on the outer peripheral side of the tab 3. Up
A plurality of vanes 7 are provided on the outer periphery of the rotor 3 by predetermined pins.
The vanes 7 are attached to the rotary shaft 1
And emerges in the radial direction by the rotation of the rotor 3
You. Thereby, Suction of working fluid, for example, hydraulic oil
This is to pressurize and discharge. In the figure, reference numeral 9 denotes a discharge port.
And reference numeral 11 denotes a suction port.

An interval is provided on the outer peripheral side of the cam ring 5.
In this state, the housing 13 is arranged. However
In this embodiment, the housing 13 is divided into two parts.
And form housing elements 21, 21. C
An actuator is provided at the connection between the housing elements 21 and 21.
Hydraulic cylinder mechanisms 23, 23 are inserted
You. The hydraulic cylinder mechanism 23 includes a cylinder 25,
Piston movably housed in cylinder 25 of
And a rod 29 fixed to the piston 27.
Have been. Then, the cylinder 25 needs one housing.
Rod 29 is connected to element 21 and rod 29 is connected to the other housing.
Connected to the locking element 21.

The hydraulic cylinder mechanisms 23, 23
It is connected to a control valve 35 via 31, 33. control
The valve 35 operates via the discharge port 9 of the vane pump.
Oil is supplied, and the returning hydraulic oil is returned to the tank T.
It has become. The control valve 35 has switching positions 35a, 35b
, 35c and when the solenoid 37 is not excited
Is neutrally held by coil springs 38 and 39
Has been switched to the switching position 35b. Also, Soleno
The magnet 37 is excited and driven in an appropriate direction.
Thus, the position is switched to the switching positions 35a and 35b.

The operation of the solenoid 37 is controlled by an arithmetic operation.
Vessel 41. Then, the control valve 35 and the computing unit 41
Thus, the control means 40 is constituted. In this arithmetic unit 41
Are the discharge pressure signal S43, the rotation speed signal S45, and the control pressure signal.
No. S47 is input, and the arithmetic unit 41
These discharge pressure signal S43, rotation speed signal S45, control pressure
It controls the solenoid 37 based on the signal S47.
is there. And the control valve according to the operating condition of the vane pump
35 is switched to operate the hydraulic cylinder mechanisms 23, 23.
Supply and discharge hydraulic fluid. Thereby the housing element
21 and 21, the shape of the cam ring 5 is appropriately changed.
It is something that goes.

According to the above embodiment, the following effects can be obtained.
Can be First, consider the operating status of the vane pump itself.
Accordingly, the shape of the cam ring 5 is deformed to
Pressure fluctuations between
Motion and noise can be effectively suppressed. or,
By appropriately changing the shape of the cam ring 5, the pressure
In addition to reducing pressure fluctuations in the force transition section,
It is also possible to control the discharge flow rate as a pump.

[0015]

【The invention's effect】 As described in detail above, the vane according to the present invention
According to the pump, the shape of the cam ring depends on the operating conditions
The pressure transition section
Effect of vibration and noise by reducing pressure fluctuations
Can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of the present invention and is a diagram showing a main part of a vane pump device.

FIG. 2 is a view showing a conventional example, showing a main part of a vane pump.
It is.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotary shaft 3 Rotor 5 Cam ring 7 Vane 13 Housing 21 Housing element 23 Hydraulic cylinder mechanism 40 Control means

────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Masumi Hayashi 2548 Dota, Kagi City, Gifu Prefecture Kayaba Industrial Co., Ltd. Gifu North Plant (Int.Cl. ⁷ , DB name) F04C 2/30-2/352 F04C 15/04 321

Claims (1)

(57) [Claims] A rotor fixed to a rotating shaft;
A cam ring arranged on the outer peripheral side of the rotor,
Plural units provided on the periphery and movably in the radial direction
And a plurality of vanes arranged on the outer peripheral side of the cam ring
And a housing formed by connecting the above housing elements.
Cylinder connecting several housing elements of a housing
Mechanism and the plurality of cylinder mechanisms according to the operating conditions.
Drive and change the shape of the cam ring via the housing
Control means for controlling
Pump device.