JPH03267589A - Divided cam ring type variable displacement vane pump - Google Patents

Abstract

PURPOSE:To obtain a pump which has little vibration and high durability by installing a fixed housing which supports the parallel shift of both J-figure- shaped divided cam rings and has a suction port and discharge port and a positioning device for controlling the position of the J-figure-shaped divided cam ring. CONSTITUTION:A variable capacity type synthetic cam ring 9 is constituted by combining J-figure-shaped divided cam rings 8 which are half divided into J figure form. A vane 3 which is held on a rotor 2 is slidingly moved on the inner peripheral surface of the variable capacity type synthetic cam ring 9, and the oil chamber 20 of a pump is variably displaced in stepless by the parallel shift of both the J-figure-shaped divided cam rings 8.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a split cam ring variable displacement vane pump. [Conventional technology]

Conventionally, variable displacement pumps include vane type and piston type, but variable displacement pumps using vane pumps are unbalanced type, so the bearings are loaded with unbalanced thrust, which causes large vibrations, and the discharge pressure is inversely proportional to the discharge volume. In particular, the power loss when changing the capacity is large, and the piston type variable capacity pump has a complicated structure and is not suitable for high-speed rotation.

[Problems to be solved by the invention]

The present invention takes the above problems into consideration and solves the above problems by developing a vane pump that is a balanced type and a variable displacement type.

[Means to solve the problem]

It consists of a rotor 2 driven by an input shaft l, a vane groove 4 provided radially on the rotor 2, a plurality of vanes 3 that can be moved in and out along the vane groove 4, and two J-shaped split cam rings 8. a fixed housing 7 that supports the parallel movement of the variable volume synthetic cam ring 9 and both J-shaped split cam rings 8.
The above problem is solved by a split cam ring type variable displacement vane pump characterized by having: and a positioning device 10 for controlling the position of the J-shaped split cam ring 8.

【Example】

In general, vane pumps are precision pumps in which the vanes freely move in and out of grooves cut radially into the rotor, and as the rotor rotates, the vanes protrude in the radial direction due to centrifugal force, and their tips end inside the cam ring. Contact and slide on the peripheral surface. The volume of the chamber surrounded by the vanes, rotor, cam ring, and side plates expands and contracts as the rotor rotates, so by providing a suction port and a discharge port in the cam ring and side plates, the chamber acts as a pump. However, conventional balanced vane pumps have limited applications because they are of a fixed displacement type, and unbalanced vane pumps can be made variable in capacity, but the bearings are unbalanced and have an insufficient lifespan. The present invention is a new type of vane pump that improves the conventional balanced fixed displacement vane pump and is capable of being both a balanced type and a variable displacement type.
It enables various applications. Features The feature of the split cam ring type variable capacity vane pump of the present invention is that while the cam ring of the conventional unbalanced variable capacity vane pump is composed of one single unit, in the present invention, the cam ring is composed of a J divided into two in a 5-shape. By combining the letter-shaped split cam rings 8 as shown in FIG. 1, a variable capacity composite cam ring 9 can be constructed. The vane 3 held by the rotor 2 slides on the inner circumferential surface of the variable capacity synthetic cam ring 9, and by parallel movement of both J-shaped split cam rings 8, the capacity of the oil chamber 20 of the pump is made steplessly variable. I can do it. Positioning device The positioning device io used in the present invention moves both J-shaped split cam rings 8 in parallel within the fixed housing 7 to control the position of the split cam ring 8. As a driving method, manual drive or hydraulic actuator is used. Drive, electromagnetic actuator drive, electric motor drive, etc. can be considered. The positioning device 10 shown in FIG.
This is an example of one drive. This positioning device 10 has J
A driven bolt 18 fixed to the letter-shaped split cam ring 8, a gear 17 with a drive side nut that engages with the driven bolt 18, fits into the fixed housing 7, and rotates freely, and an electric pulse motor that rotationally drives the gear 17 with a nut. Consists of 11,
The movement of the split cam ring 8 is controlled by the rotation direction and rotation speed of the electric pulse motor 11. At this time, by reversing the rotation direction of the cutting grooves of the left and right driven bolt arms and nut arms, the left and right divided cam rings 8 can be moved symmetrically around the rotor 2 by the rotation of the electric pulse motor 11. A composite cam ring 9 made from two split cam rings 8 while maintaining the balance between the left and right oil chambers 20.
The volume of the oil chamber can be expanded or contracted by 2 degrees. In addition, in order to smoothly expand and contract the oil chamber 20,
Although it is necessary to adjust the amount of oil held in the synthetic cam ring 9, in the present invention, the space created by the outer wall of the synthetic cam ring 9 and the inner wall of the fixed housing 7 is used as an accumulator 19, and the oil pump side inlet and oil motor The accumulator 19 is opened and used in the oil passage connecting the side discharge ports. Applications The present invention can basically be used as a balanced variable capacity vane motor or a balanced variable capacity vane compressor with the same 11 tll, and one side of the J-shaped split cam ring 8 can be fixed,
It is also possible to control the movement of only the other one; in this case, balance is lost, but the control mechanism can be simplified. Further, by combining a balanced variable displacement vane pump and a balanced variable displacement vane motor, a hydraulic continuously variable transmission can be easily realized. This hydraulic continuously variable transmission is capable of zero starting, so if applied as an automobile transmission, it will be easy to drive and contribute to safe driving.It will also lock up when the input rotation speed and output rotation speed match. Using a clutch can improve energy efficiency. Furthermore, in the lock-up state, all vanes of the pump and motor can be electromagnetically attracted and fixed in the centripetal direction, further improving energy efficiency.

[Effects of the present invention]

The following effects can be expected from the present invention. 111 is small and the operation is quiet. 2. High durability. 3. It is a variable capacitance type. 4. Balanced type with low bearing load and long life. 5. It is compact. 6. The number of parts is relatively small. 7. Zero start is possible. 8. Can be used in a wide range of applications.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention. 1 Human power shaft 2 Rotor 3 Vane 4 Vane shaft 5 Discharge port 6・−・−・・−・・−・・−Suction port 7−・・−・・
−・・・Fixed housing 8・・・・・・・・・−・・・
...-J-shaped split cam ring 9...
...Synthetic cam ring lO--Positioning device 11--Electric pulse motor 12--Drive shaft 13---Shaft Bearing 14・−・−・
...-Drive gear 15--Idle gear 16--Idle gear center shaft 17--
・・Drive side nut gear 18・・・・・・Driven bolt 19・・・・・・・・Accumulator 20・・・・・・・・Oil chamber Fig. 1

Claims (6)

[Claims] (1) A rotor 2 driven by an input shaft, a vane groove 4 provided radially on the rotor 2, a plurality of vanes 3 that can move in and out of the vane groove 4, and two J-shaped split cam rings 8.
It supports the parallel movement of the variable volume synthetic cam ring 9 and both J-shaped split cam rings 8, and
A split cam ring type variable displacement vane pump characterized by having a fixed housing 7 having a fixed housing 7 and a positioning device 10 for controlling the position of a J-shaped split cam ring 8. (2) In the split cam ring type variable displacement vane pump of the present invention as set forth in claim (1), the driven bolt 18 fixed to the split cam ring 8 and the driven bolt 18 that engages with the bolt 18 and fits into the fixed housing 7 and rotates freely. Gear with side nut 17
A split cam ring positioning device 10 characterized by having a drive mechanism (an electric pulse motor 11) that rotationally drives the gear 17 with the nut. (3) A split cam ring variable capacity vane motor having a structure basically equivalent to the split cam ring vane pump of claim (1). (4) A split cam ring variable capacity vane compressor having basically the same structure as the split cam ring vane pump of claim (1). (5) In a hydraulic continuously variable transmission that combines a hydraulic pump and a hydraulic motor, the split cam ring type variable capacity vane pump of the present invention as claimed in claim (1) and the split cam ring type variable capacity vane motor as claimed in claim 3 A hydraulic continuously variable transmission characterized by using one or both of the following. (6) A composite cam ring 9 according to claims (1), (3), and (4), characterized in that it is constituted by a plurality of divided cam rings 8, like the J-shaped divided cam ring 8.