JPS62170701A - Vane motor - Google Patents

Abstract

PURPOSE:To prevent a vane tip from falling apart from the inner periphery of a casing and to restrain the leakage of fluid by projecting a pushing up cam inside a sideplate and holding a vane between the outer periphery of the pushing up cam and the inner periphery of the casing. CONSTITUTION:An eccentric rotor 3 is arranged in a space surrounded by a hollow cylindrical casing 1 and sideplates provided in both ends of this casing 1 and vanes 6 are so arranged as to be free in sliding in plural slots 4 holed in the eccentric rotor 3. In the above-mentioned constitution, a disc-shaped pushing up cam 9 is so projected in a central part inside each side plate 2 as to be concentric with the center line 8 of the casing and thereby the front and the rear of each bane 6 in width direction are held between the outer periphery 10 of a cam and the inner periphery 12 of the casing. Hereby the pushing up cam 9 compulsively lifts up the vane 6 and holds the vane 6 between each face 10, 12, therefore the tip of the van 6 can be prevented from separating from the inner periphery 12 of the casing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vane motor used in a fluid pressure motor, and particularly to a vane motor designed to prevent fluid leakage at the tip of the vane.

[Prior Art] For example, as shown in FIG. 3, a conventional vane motor includes a neutral cylindrical casing a1, an eccentric rotor b1 that rolls along the inner peripheral surface of the casing a, and a slot C provided in the eccentric rotor b. The vane d1 is slidably supported within the slot C. It consists of a compression spring f, etc., which is placed at the protrusion of the slot C and presses the bottom surface of the vane d. During operation of the vane motor, the elastic force of the compression spring f and the centrifugal force acting on the vane d. (arrow g) is used to press the vane tip against the inner circumferential surface of casing a to prevent fluid (air or liquid) from leaking between the vane tip and the inner circumferential surface of casing a. There is. In addition, in the figure, e is the eccentricity of the eccentric rotor, and i is the casing center line.

[Problems to be Solved by the Invention] However, with the above-described structure, the centrifugal force decreases during low-speed operation, so the vane tip portion separates from the inner circumferential surface of the casing, increasing the amount of fluid leakage. In addition, in high-speed rotation motors, the compression springs fatigue quickly, resulting in problems with durability.

As a measure to avoid the above-mentioned problems, there is a vane motor with a structure called a through-vane type (not shown here), but this type of vane motor has a complicated inner casing shape and has problems such as high processing costs. There was a problem.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned problems, and its gist is that a hollow cylindrical casing and side plates provided at both ends of the casing form a space surrounded by a hollow cylindrical casing. In a vane motor in which an eccentric rotor is arranged and vanes are slidably arranged in a plurality of slots bored in the eccentric rotor, each side plate has a push-up motor having a cylindrical outer peripheral surface concentric with the casing center line at the center inside the side plate. The outer diameter of the push-up cam and the vane are such that the vane, which has a protruding cam and a vane tip and base end formed in an arc shape, is held between the outer peripheral surface of the push-up cam and the inner peripheral surface of the casing. The arc diameter is set.

[Function] The push-up cam forcibly lifts the vane and clamps the vane between the push-up cam and the inner circumference of the casing, so regardless of the operating speed of the vane motor, the tip of the vane does not separate from the inner circumference of the casing. Leakage can be minimized.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. 1st
The figure and FIG. 2 show one embodiment of the present invention, and in the figure, 1 is a hollow cylindrical casing, 2, 2 are side plates, 3 is an eccentric rotor, and 4 is a radial direction from the center line 5 of the eccentric rotor. 6 is a vane that is slidably fitted into the slot 4, 7 is an output shaft attached to the eccentric rotor 3 concentrically with the casing center line 8, and e is the amount of eccentricity. A disk-shaped push-up cam 9 is provided at the center of the inner side of the side plates 2, 2 concentrically with the casing center line 8.
．． 9 are provided in a protruding manner, and the front and rear portions of each vane 6 in the width direction are engaged and held between the cam outer circumferential surface 10 and the casing inner circumferential surface 12.

Furthermore, the cross-sectional shape of the vane perpendicular to the eccentric rotor center line 5 is created by slicing a circle 13 (shown by a virtual line) equal to the height j of the vane 6, and the tip and base ends have the same radius as the circle 13. It is formed by a circular arc.

Next, the operation of this motor, particularly the movement of the vane while the motor is operating, will be explained. While the eccentric rotor 3 is rotating, the circumferential angular position of the vanes 6 changes according to the direction of the slots 4, but the radial position with respect to the casing 1 is such that the vanes 6 are always located between the cam outer circumferential surface 10 and the casing inner circumferential surface 12. It is constant because it is restrained. Therefore, even when the motor rotates at low speed, the vane tips do not separate from the casing inner circumferential surface 12, suppressing fluid leakage to a minimum.

Also, according to the change in the angular position of the eccentric rotor 3, the vane 6
The points 16 and 17 where the contact points 16 and 17 contact the casing inner surface 12 and the cam outer circumferential surface 10 [the contact points 16 and 17 are the points where the line connecting the casing center 8 and the cross-sectional center 14 intersects the vane tip and base ends] move. However, since the tip and base ends of the vane 6 are formed in an arc shape, the tip of the vane slides smoothly along the inner circumferential surface 12 of the casing, thereby preventing vane wear and fluid leakage. .

It should be noted that the present invention is not limited only to the above-described embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, the present invention exhibits the following excellent effects.

(+) A vane with an arc-shaped vane tip and base end is sandwiched between the push-up cam provided on the side plate and the inner circumferential surface of the casing, and the radial movement of the vane is restrained, allowing the motor to operate at low speeds. The tip of the vane does not separate from the inner circumferential surface of the casing even when the air conditioner is in use, and leakage can be suppressed to a minimum.

(U) Since the shape of the push-up cam is circular, it is easy to process the cam.

(n) By forming the tip and base ends of the vane into an arc shape, the movement of the vane becomes smooth, and the point of contact between the inside of the casing and the tip of the vane changes according to changes in the angular position of the eccentric rotor. This reduces the progress of wear and prevents fluid leakage.

[Brief explanation of drawings]

Fig. 1 and Fig. 2 show an embodiment of the present invention, Fig. 1 is a cutaway side view, Fig. 2 is a view taken from the ■-■ direction in Fig. 1, and Fig. 3 is a view of a conventional vane motor. FIG. In the figure, 1 is a casing, 2 is a side plate, 3 is an eccentric rotor, 4 is a slot, 6 is a vane, 9 is a push-up cam, 1
0 indicates the outer circumferential surface of the cam, and 12 indicates the inner circumferential surface of the casing. Oko□ri□

Claims (1)

[Claims] 1) An eccentric rotor is placed in a space surrounded by a hollow cylindrical casing and side plates provided at both ends of the casing,
In a vane motor in which vanes are slidably arranged in a plurality of slots bored in the eccentric rotor, a push-up cam having a cylindrical outer peripheral surface concentric with the casing centerline is protruded from the inner center of each side plate, The outer diameter of the push-up cam and the arc diameter of the vane are set so that the vane, which has a vane tip and base end shaped like an arc, is held between the outer circumferential surface of the push-up cam and the inner circumferential surface of the casing. A vane motor featuring: