JPH0510786U - Swash plate type variable discharge piston pump - Google Patents

Abstract

(57) [Abstract] [Purpose] A variable member is provided for controlling the flow rate of the pump by changing the tilt angle of the swash plate to control the tilt angle. The variable members are two stoppers provided inside the housing. In a swash plate type variable discharge piston pump in which the pump maximum discharge amount and the minimum discharge amount are regulated by abutting against a member, when the variable member abuts or separates from the stopper member, vibration of the swash plate is stopped To provide a swash plate type variable discharge piston pump in which vibration of the entire pump is small without being transmitted to the piston. At least one of the two stopper members 10 is made movable in a direction in which the elastic member 14 is pushed between the elastic member 14 and the inside of the housing 1, and when the variable member 2 abuts on or separates from the stopper member 10, Since the shock is absorbed, the vibration of the swash plate 8 is not transmitted to the stopper 10 when the variable member 2 comes into contact with or separates from the stopper member 10, and the vibration of the entire pump is small. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention changes the tilt angle of the swash plate to control the tilt angle to control the flow rate of the pump. A variable member for controlling is provided, and the variable member is two stoppers provided inside the housing. A swash plate that comes into contact with the material and regulates the maximum discharge amount and the minimum discharge amount of the pump To an improved variable displacement piston pump.

[0002]

[Prior art]

  As such a conventional swash plate type variable discharge piston pump, for example, Japanese Patent Laid-Open No. It was as shown in 16901 publication.

[0003]

[Problems to be solved by the device]

  However, in such a conventional pump, the variable member is provided inside the housing. When restricting the maximum discharge amount and the minimum discharge amount of the pump by making contact with individual stopper members (FIGS. 5A and 5B) and when the variable member is separated from the stopper member, the swash plate is shaken. The motion was transmitted to the stopper, which caused large vibration and noise of the entire pump.   An object of the present invention is to change the tilt angle of the swash plate and control the tilt angle to control the flow rate of the pump. A variable member for controlling the quantity is provided, and the variable member is provided with two stoppers provided inside the housing. The maximum discharge amount and the minimum discharge amount of the pump are regulated by abutting against the spacer member. In the swash plate type variable displacement piston pump, the variable member contacts the stopper member or When separated, the vibration of the swash plate is not transmitted to the stopper and the vibration of the entire pump The object of the present invention is to provide a swash plate type variable discharge piston pump having a small size.

[0004]

[Means for Solving the Problems]

  For this reason, the present invention provides a swash plate type variable displacement piston according to the claims of utility model. The above-mentioned problems have been solved by providing a pump.

[0005]

【Example】     Hereinafter, the present invention will be described in detail with reference to FIGS. Figure 1 1 is a schematic sectional view of a swash plate type variable discharge piston pump according to an embodiment of the plan. Figure 2 and Figure 3 shows the state in which the swash plate of the pump of FIG. 1 is at the large discharge amount position and the minimum discharge amount position. Show each. The swash plate type variable discharge piston pump of Fig. 1 (axial piston pump 3) is attached to the housing 1 via bearings 20 and 21 It is a shaft, and the cylinder barrel 4 with many pistons 5 is a spline 2 Connected at 4. The swash plate 8 is attached to the back of the swash plate 8 on the head of the piston 5. It is held by a shoe 6 which is connected to a ball part. Cylinder barrel 4 is shuffling The shoe 6 of the piston 5 slides on the back surface of the swash plate 8 when it is rotated by the rotation of the grate 3. It is configured to stroke the piston 5.

[0006]   The tilt angle of the swash plate 8 is changed to control the tilt angle to control the flow rate of the pump. The variable member 2 that moves the swash plate 8 around the center of rotation 19 from the axis 7 of the shaft 3 Tilting device 25 for tilting and shifting to the ring 12 side, and arm 22 connected to the swash plate 8 And a spring that pushes the arm 22 against the housing 1 via the spring receiver 23. It is composed of The variable member 2 includes two strikes provided inside the housing 1. The maximum tilt angle αMAX that comes into contact with the top member 10 and becomes the pump maximum discharge amount A (Fig. 5) (Fig. 2) and the minimum tilt angle αMIN (Fig. 3) that is the minimum discharge amount B (Fig. 5) are regulated. It is supposed to be.

[0007]   The two stopper members 10 (only one on the minimum discharge side may be provided) The small-diameter portion 17 fitted into the hole 11 provided inside the ring 1 and fitted with the hole 11 and And the large-diameter portion 18 protruding from the hole 11 and the elastic spring 14 which is an elastic member has a large diameter. The stopper member 10 is pushed between the portion 18 and the hole edge surface 13 When the variable member 2 is brought into contact with the stopper member 10 or is separated from the stopper member 10, It is designed to absorb the shock. FIG. 4 shows a flat spring 14 according to an embodiment of the present invention. It is an expanded sectional view showing the modification of. “a” is a flat spring for relatively low pressure 1 4 and b are comparatively high-pressure flat springs 14A and c, which are composed of two superposed sheets and c are back-to-back. Comparing two high-pressure flat springs 14B and 14D, two back to back The high-pressure flat spring 14C composed of four sheets is shown respectively.

[0008]   The rotation center 19 of the swash plate 8 is displaced from the axis 7 of the shaft 3 toward the spring 12 side. Therefore, when the discharge pressure of the pump rises, the combined force of all pistons 5 is connected to the swash plate 8. Arm 22 is actuated to push spring 12 and pump maximum discharge From the amount A to the minimum discharge amount B, as shown in the pump discharge pressure / discharge amount curve of FIG. Output pressure and discharge rate change. Therefore, two variable members 2 are provided inside the housing 1. Of the pump, the maximum discharge amount (FIG. 2) and the minimum discharge amount (FIG. 3) ) Is regulated.

[0009]   In the present invention, the elastic spring 14, which is an elastic member, is formed between the large diameter portion 18 and the hole edge surface 13. Since it is interposed and the stopper member 10 is movable in the pushing direction, When the variable member 2 comes into contact with or separates from the stopper member 10, the impact is absorbed. The vibration of the swash plate 8 is not transmitted to the stopper member 10 and the entire pump is Vibration became small. Instead of the Sarabane 14 of the embodiment, a limitation for low pressure and low frequency A hard synthetic resin, which is an elastic member, may be used for the intended use. On the other hand, The rubber spring 14 has a dramatic impact absorption effect for low pressure to high pressure and durable applications. The fruit was generated. Attach the flat spring 14 of the embodiment to the head of the stopper member 10 and Move the topper member 10 itself in the direction in which it is pushed through the inside of the housing. You may.

[0010]

[Effect of device]

  As described above, according to the present invention, the tilt angle of the swash plate is changed to change the tilt angle. The variable member that controls the flow rate of the pump by controlling the The maximum and minimum discharge amounts of the pump are regulated by abutting two stopper members provided on the In the swash plate type variable displacement piston pump that is controlled At least one of the spacer members is pushed through an elastic member between the inside and the housing. When the variable member comes in contact with or separates from the stopper member, Since the impact is absorbed, the variable member comes into contact with or separates from the stopper member. Vibration of the swash plate is not transmitted to the stopper when The swash plate type variable discharge piston pump is provided. Example In place of the flat spring 14 of the present invention, an elastic member is used for limited applications for low pressure and low frequency. The hard synthetic resin may be used. On the other hand, Sarabane 14 is low pressure to high. For pressure- and durable applications, the dramatic shock-absorption effect described above has occurred.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a swash plate type variable displacement piston pump according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a state in which a swash plate of the pump of FIG. 1 is at a maximum discharge amount position.

FIG. 3 is a cross-sectional view of essential parts showing a state where a swash plate of the pump in FIG. 1 is at a minimum discharge amount position.

FIG. 4 is an enlarged sectional view showing a modification of the flat spring 14 according to the embodiment of the present invention.

FIG. 5 is a pump discharge pressure / discharge amount curve showing a relationship between pump discharge pressure and pump discharge amount.

[Explanation of symbols]

1. ． Housing 2. ． Variable member 3. ． Shaft 5. ． Piston 8. ． Swash plate 10. ． Stopper member 11. ． Hole 12. ． Spring 13. ． Hole edge surface 14, 14A, 14B, 14C. ． Sarabane (elastic member) 17. ． Small diameter part 18. ． Large diameter part

Claims (5)

[Scope of utility model registration request] 1. A cylinder barrel forming a pump and having a plurality of pistons, a swash plate with which the head of the piston contacts via a shoe, and a tilt angle of the swash plate for changing the tilt angle. And a variable member that controls the flow rate of the pump by contacting the two stopper members provided inside the housing to regulate the maximum discharge amount and the minimum discharge amount of the pump. In the swash plate type variable displacement piston pump configured as described above, at least one of the two stopper members is movable in a direction in which the elastic member is pushed between the elastic member and the inside of the housing, and the variable member serves as the stopper member. A swash plate type variable discharge piston pump characterized in that it absorbs the impact when it abuts. 2. The swash plate type variable discharge piston pump according to claim 1, wherein the elastic member is a flat spring. 3. The swash plate type variable discharge piston pump according to claim 2, wherein the flat spring is fixed to a head portion of the stopper member. 4. The stopper member has a small diameter portion which is fitted into a hole provided inside the housing and which fits into the hole, and a large diameter portion which projects from the hole, and the flat spring has a large diameter portion. The swash plate type variable discharge piston pump according to claim 2, wherein the swash plate type variable displacement piston pump is interposed between the swash plate and the hole edge surface. 5. The swash plate type variable discharge piston pump according to claim 4, wherein two of the flat springs are interposed one on top of the other or back to back.