JPS6011316Y2 - Variable cam mechanism in piston drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable cam mechanism in a piston drive device, which is disclosed in Japanese Patent Application No. 1291'37/1988, which was previously filed.

The above-mentioned application provides a rotating member having an inclined surface obliquely intersecting the rotational axis, and a relay plate that faces the inclined surface and swings around a support shaft as the rotating member rotates is provided with an inclined surface. This invention relates to a piston drive device in which a piston is connected to an eccentric position of the relay plate while slidingly contacting the relay plate. This paper proposes a new cam mechanism.

This restricts the range of reciprocating movement of the piston and obtains the desired pump pressure.

The gist of the present invention will be explained below based on the drawings.

Reference numeral 1 denotes a rotating shaft, which is not shown, but is directly connected to a motor, and has a rotating member 2 fixed to its tip.

The rotating member 2 includes a base 3, a large gear 4 loosely fitted on the base, a drive gear 6 meshing with the outer tooth row 5, and a small gear 8 meshing with the inner tooth row 7. Part of the outer casing 9
The long groove bearing is normally pressed outward by the elasticity of the spring 19 inserted into the groove 20 and is separated from the tooth row 5 of the large gear 4, but it can be pushed inward with a finger. When rotated while being pressed, it meshes with the large gear 4 and rotates it.

The small gear 8 is fixed integrally with a cylindrical body 8' which is rotatably fitted loosely into the base 3, and an adjustment bolt 10 is screwed into the cylindrical body.

One end of the inclined plate 11 is attached to a pivot 12 at the tip of the bolt.

Therefore, the tilt angle O of the tilt plate 12 is regulated by the movement of the bolt 10 using the base shaft support 13 as a fulcrum.

Reference numeral 14 denotes a relay plate, which is in sliding contact with the inclined plate 11 via a ball bearing 15, and whose center is supported by a support shaft 16 via a bearing 17.

18 is a piston.

In the device of the present invention having such a configuration, in order to change the inclination angle θ of the inclined plate 11 with respect to the base 3, the large gear 4 is constantly operated.
The large gear 4 is rotated around the base 3 by pressing the drive gear 6 which is elastically spaced apart from the drive gear 6, thereby causing the large gear 4 to rotate around the base 3, thereby meshing with the inner gear 7. The small gear 8 that is in the position is also rotated, and the cylindrical body 8' is also rotated.

There, the bolt 1 is prevented from rotating by the inclined plate 1.
0 is moved in the axial direction by the rotation of the cylindrical body 8'), that is, the inclined plate 11 uses the base shaft support 13 as a fulcrum and changes its inclination angle O with respect to the base 3, so that the relay plate 14
At the same time, the inclination angle of

Therefore, the range of reciprocating movement of the piston 18 is restricted and the pump pressure is regulated.

After this adjustment, if the pressing force on the drive gear 6 is released,
The gear 6 disengages from the large gear 4 due to the spring pressure, and the rotating member 2 can rotate while being separated from the gear 6.

As described above, in the device of the present invention, since the inclination angle O of the inclined plate 11 constituting the rotating member 2 can be freely changed within a certain range, the forward movement range of the piston can be restricted. Therefore, it is possible to obtain the desired pump pressure and adjust it according to the application, and in this type of device, it is possible to further reduce power consumption, and the pump pressure can be increased or decreased as necessary. It has excellent characteristics that can be obtained, and together with its economic efficiency, it has great practical benefits.

In the embodiment, a device with a single piston is shown, but it goes without saying that a device with a plurality of pistons can be installed.

[Brief explanation of drawings]

The drawing is a longitudinal sectional side view of a piston drive device equipped with the mechanism of the present invention. 1... Rotating shaft, 2... Rotating member, 3.
...Base, 4...Big gear, 5...
・Outer tooth row, 6... Drive gear, 7...
Inner tooth row, tail...small gear, 8'...tube, 9...outer casing, 10...adjustment bolt,
11... Inclined plate, 12... Pivotal part, 1
3...Base shaft support, 14...Relay plate,
15, 17...Ball bearing, 16...
...Spindle, 18...Zeston.

Claims (1)

[Scope of utility model registration request] A rotating member 2 having an inclined surface obliquely intersecting with the rotational axis is provided, and a relay plate 14 that faces the inclined surface and swings around the support shaft 1 as the rotating member 2 rotates is provided on the inclined surface. In the driving device in which a piston 18 is connected to an eccentric position of the relay plate 14, the rotating member 2 includes a base 3, and a large gear 4 that is loosely fitted on the base 3 and has tooth rows on the inner and outer sides. and foundation 3
An inclined plate 11 having one end pivotally supported to form the inclined surface, and a small gear 8 meshing with the inner tooth row 1 of the large gear 4 are rotatably mounted on the base 3, and one end is pivoted to the base 3. An adjustment bolt 10 is screwed into the axis of the cylindrical body 8' of the gear 8 and the other end is supported by the other pivot end of the base 3; 4 and a drive gear 6 configured to be able to engage and disengage.