JPH0610462B2 - Centrifugal advance device for ignition distributor for internal combustion engine - Google Patents

Description

Detailed Description of the Invention

[Field of Industrial Application] The present invention relates to a centrifugal advance device for an ignition distributor for an internal combustion engine. [Prior Art] In the prior art, C-shaped engaging portions at both ends of a coil spring that generates a spring force that balances a centrifugal force acting on a governor weight are engaged with a hanger pin, and a metal member of the engaging portion is used. In order to prevent wear caused by the contact of the abdomen, heat treatment is performed to increase the surface hardness of the hanger pin, and a resin bush is interposed in the engaging portion between the hanger pin and the spring (for example, the actual open sho 57. -35464). [Problems to be Solved by the Invention] However, each of the above-mentioned conventional devices has a problem that the assembling property of the spring is poor. Therefore, it is an object of the present invention to reduce the wear of the engaging portion and to satisfactorily assemble the spring. [Means for Solving the Problems] Therefore, the present invention is directed to an input side shaft driven by an internal combustion engine, a governor weight that operates in response to a centrifugal force caused by rotation of the input side shaft, and a governor weight of the governor weight. An output side shaft that advances with respect to the input side shaft in response to an operation; a coil spring that has C-shaped engaging portions at both ends and that generates a spring force that balances the centrifugal force that acts on the governor weight; A claw formed at the tip with an outer dimension smaller than the inner diameter of the C-shaped engaging portion, and a shoulder gradually expanding toward the base side from the claw portion to an outer dimension larger than the inner diameter of the C-shaped engaging portion. A metal hanger having a portion and an outer diameter smaller than the inner diameter of the C-shaped engaging portion and fitted to the outer circumference of a portion of the shoulder portion having an outer dimension smaller than the inner diameter of the C-shaped engaging portion. Have dimensions The outer periphery of the neck with which the C-shaped engaging portion engages, and the collar portion formed at the tip of the neck with an outer size larger than the inner diameter of the C-shaped engaging portion and prevented from coming off by the claw portion. A centrifugal advance device for an ignition distribution device for an internal combustion engine, comprising: [Operation] As a result, the C-shaped engaging portion of the coil spring is assembled to the hanger, and the resin bush is pushed into the hanger to move the C-shaped engaging portion by the shoulder portion of the hanger and the brim portion of the resin bush. Is regulated and the C-shaped engaging portion engages with the outer periphery of the neck portion of the resin bush. [Examples] Examples of the present invention will be described below. 1 to 4, reference numeral 1 denotes a metal input shaft driven by an internal combustion engine, which is rotatably supported by a distributor housing (not shown). 2 is the input shaft 1
A metal holding plate 3 fixedly attached to the holding plate 3 is a pair of metal governor weights pivotally mounted on the holding plate 2 and 4 is a portion of the input side shaft 1 protruding from the holding plate 2 above the holding plate 2. A metal output shaft 6 is movably fitted, and a metal governor plate 6 faces the holding plate 2 and is fixed to the lower end of the output shaft 4. Reference numeral 7 is a metal coil spring that generates a spring force that balances the centrifugal force acting on each governor weight 3, and C-shaped engaging portions 7a are formed at both ends thereof. Reference numeral 8 denotes a pair of metal hangers which are fixed to the holding plate 2 by being planted or bent, and the outer ends of which are smaller than the inner diameter d ₁ of the C-shaped engaging portion 7a of the coil spring. A claw portion 8a having a dimension of l ₁ is formed, and after further constricting from the lower end of the claw portion 8a, it gradually expands to an outer dimension larger than the inner diameter d _{1 of the} C-shaped engaging portion 7a. Shoulder portion 8b having a curved surface shape (may be an inclined surface shape)
Are formed. Reference numeral 9 denotes a resin bush, which has a neck portion 9a having an outer shape slightly smaller than the inner diameter d ₁ of the C-shaped engaging portion 7a and a curved portion whose lower end gradually becomes smaller, and the neck portion 9a.
Has a collar portion 9b formed on the upper end of the c-shaped engaging portion 7a with an outer dimension larger than the inner diameter d ₁ of the engaging portion 7a. The collar portion 9b has an outer dimension l ₁ of the claw portion 8a of the hanger 8. A slightly smaller engagement hole 9c is formed, and the engagement hole 9c is formed in the neck 9
The engaging hole 9c is formed in a shape conforming to the shape of the shoulder 8b of the hanger 8 on the side of the claw 8a, and the C-shaped end of the coil spring 7 is formed on the outer periphery of the neck 9a. The resin bush 9 is fitted to the tip of the hanger 8 in a state where the shaped engagement portion 7a is engaged. Reference numeral 10 denotes a pair of metal hangers that are vertically fixed to the governor plate 6, and have a claw portion and a shoulder portion having the same shape as the hanger 8 on the holding plate 2, and the tips of these hangers 10 are also resin bushes. 9 is fitted, and a C-shaped engaging portion 7a at the other end of the coil spring 7 is engaged with the neck portion of the resin bush 9. Next, referring to FIG. 4, description will be given in the order of assembling. (1) Assemble the C-shaped engaging portion 7a of each spring 7 from the top to the tips of the hangers 8 and 10. At this time, the position of each spring 7 is localized at the position where the gap g is the minimum due to the spring force of the spring trying to contract. (2) Assemble the bushes 9 from above the hangers 8 and 10. At this time, the curved surface at the tip of the neck 9a enters the gap g and simultaneously pushes the C-shaped engaging portion 7a of the spring 7 downward. As a result, the C-shaped engaging portion 7a is attached to the hangers 8 and 10.
The gap g for the shoulder portion 8b is widened and the resin bush 9 is localized at the outer peripheral position of the neck portion 9a. (3) When the resin bush 9 is pushed further down, the hanger 8,
10 is crossed over the claw portion 8a, and the assembling is completed. [Advantages of the Invention] By adopting the above configuration, the coil spring 7 can be assembled only by assembling from above, and the spring 7 and the bush 9 can be effectively prevented from coming off. Further, the adoption of the resin bush has an excellent effect that it is possible to prevent abrasion due to contact with the metal.

[Detailed Description of Drawings]

FIG. 1 is a perspective view showing an embodiment of the device of the present invention, FIGS. 2 and 3 are exploded perspective views of the essential parts of the device shown in FIG. 1, and a perspective view of the assembly completed state, and FIG. It is a front view which shows the assembly state of the FIG. 3 illustration part one by one. 1 …… Input shaft, 3 …… Governor weight, 4 ……
Output side shaft, 7 ... Coil spring, 7a ... C
Character-shaped engaging portion, 8, 10 ... Hanger, 8a ... Claw portion, 8
b ... shoulder, 9 ... resin bush, 9a ... neck, 9b
The brim.

Claims (1)

[Claims] 1. An input-side shaft driven by an internal combustion engine, a governor weight that operates in response to a centrifugal force caused by the rotation of the input-side shaft, and an input-side shaft that responds to the operation of the governor weight. From the inner diameter of the C-shaped engaging portion, the output-side shaft that advances with respect to each other, a coil spring that has C-shaped engaging portions at both ends, and that generates a spring force that balances the centrifugal force that acts on the governor weight. A metal hanger having a claw portion formed at the tip with a small outer dimension and a shoulder portion gradually expanding toward the root side from the claw portion to an outer dimension larger than the inner diameter of the C-shaped engaging portion; The shoulder portion is fitted to the outer circumference of a portion having an outer dimension smaller than the inner diameter of the C-shaped engaging portion, and has an outer dimension smaller than the inner diameter of the C-shaped engaging portion, and the C The letter-shaped engaging part engages An ignition distributor for an internal combustion engine, comprising: a neck portion; and a resin bush having a collar portion formed at an end of the neck portion, the collar portion having an outer dimension larger than the inner diameter of the C-shaped engaging portion, the collar portion retaining the collar portion. Centrifugal advance device.