JP3269962B2 - Universal shaft coupling - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement of a universal shaft coupling.

[0002]

2. Description of the Related Art A universal shaft coupling has a first shaft member and a second shaft member connected to each other so as to freely swing, and is used in various places as follows. FIG. 5 is a perspective view of a rear portion of a general hatchback type automobile, and shows a vehicle 100.
Has a back door 102 at the rear of the vehicle body 101. The back door 102 can be kept open by the support action of the support struts 103. For more information,
The support strut 103 has one end connected to the vehicle body 101 and the other end connected to the back door 102 via a universal joint 110. 103a is a strut bar.

FIG. 6 is a sectional view of a conventional universal joint.
The universal joint 110 has a first shaft member 111 having a ball portion 111a at the tip, a second shaft member 112 having a concave portion 112a for accommodating the ball portion 111a, and a fixed angle swingably housed in the concave portion 112a. A circlip 113 for preventing the ball portion 111a from coming off. First shaft member 1
Reference numeral 11 denotes a base end screwed to the back door 102, and the second shaft member 112 is screwed to the strut bar 103a. The first and second shaft members 111 and 112 may be made of stainless steel so as not to rust, but the universal joint 110 becomes expensive. Therefore, in general, the first and second shaft members 111,
The surface of 112 is plated so that the surface does not rust.

[0004]

SUMMARY OF THE INVENTION The above prior art is based on the first technique.
When the shaft member 111 and the second shaft member 112 relatively swing, the corner or the like of the second shaft member 112 hits the neck 111b of the first shaft member 111, and the plating layer of the neck 111b is cut. I am worried about being taken. If the plating layer is shaved, rust is generated on the neck portion 111b. Therefore, in order to maintain the smooth operation of the universal joint 110, it is necessary to prevent the generation of rust.

Accordingly, an object of the present invention is to prevent rust from being generated at the neck portion of the first shaft member, and to maintain the smooth operation of the universal joint.

[0006]

According to the first aspect of the present invention, there is provided a method for manufacturing a semiconductor device, comprising:
A universal shaft joint comprising a shaft member, a second shaft member provided with a concave portion for accommodating the ball portion, and a retaining member for retaining the ball portion housed in the concave portion so as to swing freely by a predetermined angle; The first shaft member consists of a rod and its tip
A generally swab-shaped body comprising the ball portion;
Part is tapered from the base end to the ball end.
Metal material having a tapered portion formed therein.
It is the part where the diameter becomes almost the minimum
When a site elastically clamped to the neck portion of the first shaft member and the neck portion, wherein the kite and tree fat coating.
Since the neck portion of the first shaft member is covered with the resin, the metal material of the neck portion is not directly rubbed by the retaining member. Further, it is easy to make the thickness of the resin coating thicker than the plating layer, and even if the thick resin coating is rubbed with a retaining member, there is no fear that the resin coating is scraped off until the metal surface is exposed. Therefore, there is no risk of rust on the metal surface of the neck,
The neck portion has high durability against rubbing with the retaining member. Therefore, the universal joint can easily maintain a smooth operation.

According to a second aspect of the present invention, the ball portion is made of a resin, and the resin is connected to the resin for covering the neck portion. Since the molding of the ball portion corresponding to the cotton portion and the molding of the neck portion covering resin can be performed simultaneously with the same molding die, the productivity is increased. Further, the weight of the first shaft member is reduced, so that the weight of the universal joint can be further reduced. Further, since the frictional resistance between the ball portion and the concave portion, which is the cotton portion, can be reduced, the sliding between the ball portion and the concave portion is further smoothed.

The invention according to claim 3 is characterized in that the universal joint is used at an end of a support strut for supporting a back door of an automobile in an open state. Even if the neck portion is rubbed by the retaining member due to the vibration of the automobile or the relative swing of the first and second shaft members, there is no possibility that rust is generated on the metal surface thereof. For this reason, the neck portion has high durability against rubbing with the retaining member.
Therefore, a universal joint having such a neck portion is most suitable as a joint used under severe conditions exposed to rainwater, such as a joint of a support strut for an automobile.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings should be viewed in the direction of reference numerals. 1A and 1B are configuration diagrams of a universal joint according to the present invention, wherein FIG. 1A shows a cross section, and FIG. 1B shows a bb cross section of FIG. The universal shaft joint 1 is configured such that the first shaft member 10 and the second shaft member 20 are relatively swingably connected to each other, and are further prevented from falling off by the stopper member 30. Specifically, as shown in (a), the first shaft member 10 has a ball portion 18 at the tip, and the second shaft member 20 has a concave portion 21 for accommodating the ball portion 18. The recess 21 accommodates the ball portion 18 so as to be swingable by a certain angle.

[0010] As shown in FIG.
Is a plate spring which is bent in a substantially U-shape in plan view, and whose open ends 31, 31 protrude into the recess 21. The open ends 31, 31 come into contact with the neck 14 a of the first shaft member 10 so that the ball 18 stored in the recess 21
It acts as a retainer.

The universal joint 1 is attached to, for example, an end of the support strut 103 for the back door 102 shown in FIG. In this case, the first shaft member 1
0 indicates that the bolt portion 12 is attached to the back door 102 and the second
The shaft member 20 preferably has the female screw portion 22 attached to the strut bar 103a.

FIG. 2 is a cross-sectional view of a first shaft member according to the present invention. The first shaft member 10 has a substantially swab shape, and a shaft portion 11 corresponding to the rod portion is made of metal. Is formed of resin. More specifically, the shaft portion 11 includes a bolt portion 12 at the base end, a first tapered portion 13 tapering to the head of the bolt portion 12, and a second tapering portion 14 tapering to the first taper portion 13.
And a distal end portion 15 connected to the second tapered portion 14 are coaxially and integrally formed. In particular, the first tapered portion 13, the second tapered portion 14, and the distal end portion 15 form a rod-shaped member. Is constituted.

The second tapered portion 14 has a smaller diameter than the first tapered portion 13 and is formed by coating a metal material with a resin. That is, the second tapered portion 14 covers at least the neck portion 14 a with the neck portion coating resin 17 when the portion contacting the retaining member 30 indicated by the imaginary line is the neck portion 14 a of the first shaft member 10. It was done.

The distal end portion 15 is a column having substantially the same diameter as the distal end of the second tapered portion 14 and has a knurled cut on the outer peripheral surface thereof. Then, a resin ball portion 18 is formed integrally with the tip end portion 15, and a neck portion coating resin 17 is made continuous with the resin ball portion 18. Shaft 1
1 is made of, for example, carbon steel for mechanical structure, and the ball portion 18 and the neck portion coating resin 17 are made of, for example, a polyether sulfone resin added with a glass fiber. A portion of the shaft portion 11 that is not coated with a resin is plated.

FIG. 3 is an explanatory view of the first shaft member according to the present invention. The shaft portion 11 of the first shaft member 10 is a cantilever beam to which the bolt portion 12 is fixed and receives a concentrated load W at a free end, and a “beam of equal strength” (a uniform stress is applied to any cross section). Is a beam). That is, the first tapered portion 13 of the shaft portion 11
In addition, the diameter of the second tapered portion 14 is set so as to be substantially the same as the line S having a diameter required for strength. For this reason, the diameter of the neck portion 14a (see FIG. 2) is substantially the minimum in terms of strength, so that the neck portion 14a can be loosely fitted to the retaining member 30. Therefore, the contact surface pressure between the neck portion 14a and the retaining member 30 decreases, and the universal joint 1 acts more smoothly and becomes lighter.

Next, the operation of the universal joint 1 having the above structure will be described with reference to FIG. First shaft member 10 and second shaft member 20
Are relatively swingably connected to each other, and the neck portion 14a
Are elastically clamped by the open end portion 31 of the retaining member 30 so that they are connected without falling off. Since the neck portion 14a of the first shaft member 10 is covered with the neck portion coating resin 17, the metal surface is not exposed, and is not directly rubbed by the retaining member 30. Further, even if the resin coating is rubbed with the retaining member 30, the resin coating can be made thicker than the plating layer, so that there is no fear that the resin coating is scraped off until the metal surface is exposed. For this reason, even if the neck portion 14a is rubbed by the retaining member 30 due to the vibration of the automobile or the relative swing of the first and second shaft members 10 and 20, rust is generated on the metal surface. Since there is no fear, the durability against rubbing with the retaining member 30 is improved. Such a universal joint 1 is particularly suitable for use under severe conditions such as automobiles exposed to rainwater.

In the embodiment of the present invention,
The first shaft member 10 is characterized in that at least the neck portion 14a is covered with the neck portion coating resin 17, and may have the following configuration, for example. 4A and 4B are cross-sectional views of another embodiment of the first shaft member according to the present invention. (A)
Is constituted integrally with the shaft portion 11 and the ball portion 18 by metal,
In addition, the second tapered portion 14 and the ball portion 18 are covered with a resin. According to this configuration, since the shaft portion 11 and the ball portion 18 can be manufactured at the same time, the productivity of the first shaft member 10 increases. (B) shows a structure in which the shaft portion 11 and the ball portion 18 are integrally formed of metal, and only the second tapered portion 14 is covered with the neck portion coating resin 17. According to this configuration, since there are few portions to be covered with the resin, the resin molding is simple.

In the above embodiment of the present invention,
The universal joint 1 is not limited to the one attached to the end of the support strut 103 of the back door 102. For example, the universal joint 1 may be attached to the end of a vehicle hood stay or a brake pedal absorber. Further, the present invention can be applied to various parts other than automobiles.

[0019]

According to the present invention, the following effects are exhibited by the above configuration. According to the first aspect of the present invention, the first shaft of a generally swab-shaped body is provided.
To the minimum diameter of the tapered part of the rod part of the member
Part that is elastically held by the retaining member
When the position is the neck portion of the first shaft member, the neck portion is covered with the resin, so that the metal material of the neck portion is not directly rubbed by the retaining member. Further, it is easy to make the thickness of the resin coating thicker than the plating layer, and even if the thick resin coating is rubbed with a retaining member, there is no fear that the resin coating is scraped off until the metal surface is exposed. For this reason, since there is no possibility that rust is generated on the metal surface of the neck portion, the neck portion has high durability against rubbing with the retaining member. Therefore, the universal joint can easily maintain a smooth operation.

According to a second aspect of the present invention, the ball portion is made of resin, and the resin is made continuous with the neck portion coating resin, so that the ball portion corresponding to the cotton portion and the neck portion coating resin are formed. Can be performed simultaneously with the same molding die, thereby increasing the productivity. Further, the weight of the first shaft member is reduced, so that the weight of the universal joint can be further reduced. Further, since the frictional resistance between the ball portion and the concave portion, which is the cotton portion, can be reduced, the sliding between the ball portion and the concave portion is further smoothed.

According to the third aspect of the present invention, since the universal joint is used at the end of the support strut for supporting the back door of the vehicle in an open state, the vibration of the vehicle and the first vibration can be reduced.
-Even if the neck portion is rubbed by the retaining member with the relative swing of the second shaft member, there is no possibility that rust is generated on the metal surface thereof. For this reason, the neck portion has high durability against rubbing with the retaining member. Therefore, a universal joint having such a neck portion is most suitable as a joint used under severe conditions exposed to rainwater, such as a joint of a support strut for an automobile.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a universal shaft coupling according to the present invention.

FIG. 2 is a sectional view of a first shaft member according to the present invention.

FIG. 3 is an explanatory view of a first shaft member according to the present invention.

FIG. 4 is a sectional view of another embodiment of the first shaft member according to the present invention.

FIG. 5 is a perspective view of a rear portion of a general hatchback type automobile.

FIG. 6 is a sectional view of a conventional universal shaft coupling.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Universal shaft joint, 10 ... 1st shaft member, 11 ... Shaft part, 14
... Second taper portion, 14a ... neck portion, 15 ... tip portion, 1
7 ... Neck coating resin, 18 ... Ball part, 20 ... Second shaft member, 21 ... Concave part, 30 ... Retaining member, 31 ... Open end part, 100 ... Car, 101 ... Body, 102 ... Back door, 103 ... Support strut, 103a ... Strut bar.

Continuation of the front page (56) References JP-A-59-17017 (JP, A) JP-A-5-346114 (JP, A) JP-A 8-82318 (JP, A) , U) Japanese Utility Model Showa 53-37880 (JP, U) Japanese Utility Model Showa 62-153419 (JP, U) Japanese Utility Model Showa 55-46875 (JP, U) Japanese Utility Model Showa 34-21417 (JP, Y1) (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 11/06

Claims (3)

(57) [Claims] A first shaft member having a ball portion at a tip thereof;
A universal shaft joint comprising a second shaft member having a concave portion for accommodating the ball portion, and a retaining member for retaining the ball portion housed in the concave portion so as to be swingable at a predetermined angle; The ball part and the ball at the tip of it
And a generally swab-shaped body consisting of a portion, and the portion of the stick is tapered from the base end to the ball portion at the tip.
Metal material having a tapered portion that becomes
Part of the part having a minimum diameter, and
The site for resiliently held between timber when the neck portion of the first shaft member, universal joint, wherein the kite the neck portion and tree fat coating. 2. The universal joint according to claim 1, wherein the ball portion is made of a resin, and the resin is made continuous with the resin for covering the neck portion. 3. The universal shaft according to claim 1, wherein the universal shaft joint is used at an end of a support strut for supporting a back door of an automobile in an open state. Fittings.