JP2564557Y2 - Distributor coupling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application field] The present invention relates to a device for connecting a camshaft and a distributor using an Oldham joint in an engine of an automobile or the like.

[Prior Art] Such a connecting device connects a camshaft and a rotor shaft of a distributor by one-to-one rotation by means of an Oldham joint, and is connected to the rotor shaft by a pin and to the camshaft in advance by a pawl. The protrusion formed in the shape of
The camshafts are connected by fitting into a groove formed at an end thereof.

[Problems to be Solved by the Invention] By the way, since the rotation fluctuation of the camshaft is considerably large, the transmission of this vibration has a considerable influence on the durability of the function of the distributor. Therefore, it has been considered that transmission of vibration from the camshaft to the distributor is reduced by interposing an elastic body in the protruding portion. However, simply attaching an elastic body to the protruding portion or the like easily causes abrasion, so that sufficient durability in use cannot be obtained.

Therefore, an object of the present invention is to provide a connecting device of a distributor that can improve the durability of an elastic body.

Means for Solving the Problems In order to solve the above problems, a distributor connecting device according to the present invention includes a camshaft connected to an Oldham joint for connecting a rotor shaft of the distributor and a camshaft of an engine by an Oldham joint. In a distributor coupling device having a protrusion fitted into a split groove at a shaft end and an elastic body attached to the protrusion, the protrusion is covered from above the elastic body and fitted into the split groove of the camshaft. The cover includes a base that engages with the outer periphery of the Oldham joint so as to be relatively movable, and a fitting part that projects from the base in a substantially U-shaped cross section. Are fitted into the split groove of the camshaft and come into contact with the inner surface of the split groove so as to be able to move relative to each other. The projecting portion of the fitting and the elastic body attached to the surface of the projecting portion are fitted to each other, and the fitting tolerance at this time forms a gap between the outer surface of the fitting portion and the inner surface of the split groove such that relative movement is possible. The protrusion of the Oldham joint and the elastic body attached to the surface of the protrusion fit into the fitting part, and the relative movement between the inner surface of the fitting part and the surface of the elastic body is caused by the fitting tolerance at this time. It is characterized in that a gap as much as possible is formed.

[Effect of the Invention] The protrusion of the Oldham joint to which the elastic body is attached is fitted into the fitting portion of the cover, and the base of the cover is engaged with the outer peripheral portion of the Oldham joint so as to be relatively movable. continue,
This fitting portion is fitted into the split groove of the camshaft and brought into contact with the inner surface of the split groove so as to be relatively movable.

By doing so, the Oldham joint and the camshaft are connected via the cover, and the contact portion between the camshaft and the fitting portion of the cover and the contact portion between the fitting portion of the cover and the elastic body are respectively fitted. A slight gap is formed due to the inevitable tolerance that accompanies the above, and the contact sections are connected to each other so as to be relatively movable by the gap.

Therefore, the vibration from the camshaft is absorbed by the elastic body, and the transmission of the vibration in the rotational radial direction along the split groove from the camshaft to the Oldham joint is reduced, so that the vibration to the distributor side is reduced.

In addition, the elastic body does not directly contact the camshaft, but is in contact with the fitting part of the cover so that it can move relative to
Since the vibration absorption performance of the elastic body is maintained and the cover is engaged with the Oldham joint, the degree of relative motion in the contact portion between the fitting portion of the cover and the elastic body is different from that of the fitting portion of the cover. Significantly less than the degree of relative movement between the camshaft and the groove,
Example of Improving the Abrasion Resistance of Elastic Body to Endurable Use FIG. 1 to FIG. 4 show an example. FIG. 4 shows that a camshaft 1 provided in an automobile engine is connected to one side of an Oldham joint 4 via a cover 3 in a split groove 2 formed at an axial end of a camshaft 1 and is provided in a distributor 5 on the other side. FIG. 3 is a diagram showing a state where one ends of rotor shafts 6 are connected. A power distribution rotor 7 is attached to the other end of the rotor shaft 6.

FIGS. 1 and 2 show the structure of the Oldham's joint 4. The circular body portion 8 has a mounting hole 9 formed in the axial direction. The mounting hole 9 has the rotor shaft 6 inserted therein. . Further, a pin hole 10 is formed to penetrate in a direction crossing the body portion 8, and the rotor shaft 6 is connected by a pin 11 inserted therein. The pin 11 is retained by a band 12 fitted around the body 8. A step 13 is formed over the entire periphery of the body 8 in the vicinity of the band 12 fitting portion. For one side of the body 8, a pair of claw-shaped protrusions 14 are formed so as to protrude, and a suitable elastic body 15 such as rubber is adhered to the side surface. Further, a metal cover 3 is placed on the protruding portion 14 of the Oldham joint 4 from above the elastic body 15.

As shown in FIG. 3, the cover 3 is formed by a fitting portion 16 formed so as to cover both side surfaces of the projecting portion 14 and a base portion 17 continuously covering the outer periphery of the body 8 of the Oldham joint 4. The base 17 is bent inward at an edge of the base 17 to form an engagement portion 18 with the step 13. When the base 17 is engaged with the step 13 of the Oldham joint 4, the cover 3 is engaged with the Oldham joint 4 so as to be able to move relative to the Oldham joint 4, and the fitting portion 16 is substantially U-shaped in cross section from the base 17. , And fits into the camshaft groove 20, and a small gap formed by a tolerance inevitably generated with this fitting causes the groove 2
Contact with the inner surface of the
The projection 14 of the Oldham joint and the elastic body 15 attached to the surface of the projection fit into the projection 16, and the front surface of the fitting section 16 and the elastic body 15 are inevitably generated with this fitting. The contact is provided so as to be relatively movable by a slight gap formed by the tolerance.

Next, the operation of the present embodiment will be described. As shown in FIG.
When the cover 3 is put on the Oldham joint 4, the cover 3
The cover 3 is attached to the Oldham joint 4 so as to be relatively movable by engaging the engaging portion 18 with the step portion 13 of the Oldham joint 4. Therefore, as shown in FIG. 4, the protrusion 14 covered by the fitting portion 16 is connected to the camshaft 1.
Cover 3 comes into contact with the camshaft 1 side. When the camshaft 1 rotates in this state, the rotational vibration on the camshaft 1 side is absorbed by the elastic body 15 and transmitted to the rotor shaft 6 in a reduced state.
Impairment of the function and durability of the distributor 5 is reduced.

Further, since the elastic body 15 comes into contact with the camshaft 1 via the cover 3 and does not directly contact the camshaft 1, the cover 3 functions as a wear-resistant protective member of the elastic body 15,
The durability of the elastic body 15 increases. In addition, since the cover 3 can move relative to the Oldham joint 4, the elastic body
15 vibration absorption performance is not impaired. Further, since the cover 3 can relatively move in the direction of the radius of rotation along the split groove 2 of the camshaft 1, the transmission of vibration from the camshaft 1 to the Oldham joint 4 is reduced.

[Effects of the Invention] In the present invention, an elastic body is attached to the protrusion of the Oldham's joint, and a cover for covering the protrusion from above the elastic body is provided. The cover is connected to the camshaft via the cover. A base that engages with the outer peripheral portion of the Oldham joint so as to be relatively movable, and a fitting portion that projects from the base in a substantially U-shaped cross section are provided, and the fitting portion is fitted into the split groove of the camshaft. To make contact with the inner surface of the split groove so as to allow relative movement, and fit the projection of the Oldham joint and the elastic body attached to the surface of this projection into this fitting part,
Further, the fitting portion was brought into contact with the elastic body so as to be capable of relative movement.

In the fitting between the fitting portion of the cover and the split groove of the camshaft and the fitting of the fitting portion of the cover and the elastic body, a slight gap is formed due to a tolerance that is inevitably generated with the fitting. The gap allows each contact portion to move relative to each other.

Therefore, the cover can be moved relative to the Oldham joint and the camshaft, respectively, so that the vibration in the rotation radial direction along the split groove of the camshaft to the Oldham joint is reduced, and the vibration on the camshaft side is caused by the elastic body. , The rotation can be transmitted from the engine to the distributor with reduced vibration.

Moreover, since the cover is engaged with the Oldham joint, the degree of relative movement at the contact portion between the fitting portion of the cover and the elastic body is relatively small between the fitting portion of the cover and the split groove of the camshaft. This is significantly less than the degree of movement, and as a result, the durability of the entire distributor can be improved by improving the wear resistance of the elastic body.

In addition, since the elastic body can be prevented from directly contacting the camshaft by the interposition of the cover, the durability of the elastic body can be greatly improved to a level that can sufficiently withstand use.

[Brief description of the drawings]

1 to 4 show an embodiment, FIG. 1 is a sectional view of an Oldham joint, FIG. 2 is a sectional view taken along line AA of FIG. 1, FIG. 3 is an enlarged perspective view of a cover, FIG. 4 is an assembly diagram at the time of use. (Explanation of reference numerals) 1 ... Camshaft, 3 ... Cover, 4 ... Oldham joint, 5 ... Distributor, 6 ... Rotor shaft, 14 ... Protrusion, 15 ... Elastic body.

Claims (1)

(57) [Scope of request for utility model registration] In order to connect a rotor shaft of a distributor and a camshaft of an engine with an Oldham joint, a projection fitted into a split groove at a camshaft shaft end and an elastic body attached to the projection are attached to the Oldham joint. In the distributor connecting device, a cover that covers the protrusion from above the elastic body and is fitted into the split groove of the camshaft is provided, and the cover can move relative to the outer peripheral portion of the Oldham joint. And a fitting portion protruding from the base in a substantially U-shaped cross section. When the fitting portion is fitted into the split groove of the camshaft,
A gap is formed between the outer surface of the fitting portion and the inner surface of the split groove due to the fitting tolerance, and a protrusion of the Oldham joint and an elastic body attached to the surface of the protrusion in the fitting portion. Are fitted, and a gap is formed between the inner surface of the fitting portion and the surface of the elastic body by a fitting tolerance at this time so as to allow relative movement.