JPH0562751U - Cam ring structure - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a cam ring structure which eliminates the work of removing burrs from the cam surface, forms a smooth cam surface, and enables cost reduction. [Constitution] The cam ring body is configured by cutting the meat portion corresponding to the cam surface from the plate body by press working, and the cam ring body is made into a cylindrical shape while making the burr generated at the end during press working outward, and the butting It is assumed that the parts are joined by projection welding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cam ring structure for adjusting an initial of a suspension spring in a vehicle hydraulic shock absorber.

[0002]

[Prior Art]

 As shown in FIG. 6, a conventional hydraulic shock absorber of this type is provided with a guide tube B on the outer circumference of a cylinder A, and a cam ring 1 is arranged on the outer circumference of the guide tube B so as to be rotatable and vertically movable. A stopper C is provided on the outer circumference of the tube B.

The cam ring 1 is connected to the worm wheel 3, and the worm wheel 3 is meshed with the worm 31.

Therefore, when the worm 31 is rotated, the worm wheel 3 and the cam ring 1 are rotated in the circumferential direction on the outer circumference of the guide tube B, and the cam surface 5 of the cam ring 1 is brought into sliding contact with the stopper C, and the height of the cam surface 5 is increased. The cam ring 1 moves up and down accordingly.

Therefore, the housing D that interlocks with the cam ring 1 moves up and down, and the initials of the suspension springs E supported by the housing D are adjusted.

As shown in FIGS. 9 to 10, the structure of a conventional cam ring of this type is formed by using a cylindrical pipe for the cam ring 1 and cutting the cam surface 5 with an intermittent press.

The cam ring 1 and the worm wheel 3 shown in FIGS. 7 to 8 are prevented from rotating by fitting the stopper 2 welded to the cam ring 1 and the concave groove 4 of the worm wheel 3 to each other. The stopper 2 is arranged at an arbitrary position on the circumference of the cam ring 1.

[0008]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, it is difficult to remove the cutting burr generated on the entire inner surface side when the cam surface 5 of the cam ring 1 is cut.

Further, when the cutting burr remains, the burr contacts the outer peripheral surface of the guide tube B, and thus a functional problem such as a large operation torque in the vertical movement of the cam ring 1 occurs.

Further, during processing, the blade is applied to the cam surface 5 many times in a stepwise manner, so that a smooth surface cannot be formed and sliding resistance is generated between the cam surface 5 and the stopper C. There is a problem.

Therefore, the present invention has been devised in view of the above-mentioned problems of the prior art. It solves the existing problems and eliminates the cam surface deburring work, smooth cam surface formation, and burr removal. It is an object of the present invention to provide a structure of a cam ring capable of preventing sliding resistance and reducing costs.

[0012]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the structure of the cam ring according to the present invention, the flesh portion corresponding to the cam surface is cut from the plate body by press working to form the cam ring body, and the burrs generated at the end portion during press working. The main part of the cam ring is made cylindrical while the part is on the outside, and the abutting parts are joined by projection welding.

[0013]

[Action]

 Since the cam surface is formed by pressing, the cam surface becomes smooth.

Since the burr generated at the end of the cam surface is located outside, the burr does not come into contact with the guide tube and sliding resistance is not generated.

[0015]

【Example】

 An embodiment will be described with reference to FIGS. 1 to 5. As shown in FIG. 1, the cam surface 11 of the cam ring 10 is formed by pressing a metal plate 10A, which is a plate body in which the cam ring 10 is expanded. Is formed by cutting the meat portion corresponding to.

During press working, burrs do not occur on the inner surface 14 of the press blade 16 on the entry side when cutting with the press blade 16, but burrs P occur on the outer surface side (see FIG. 6).

The cam surface 11 is formed as a continuous and smooth cam surface because it is integrally processed by the press.

After pressing, the metal plate 10A is rolled into a cylindrical shape as shown in FIGS.

At this time, the metal plate 10A is bent such that the inner surface 14 without the burr P is inside and the outer surface 15 where the burr P is present is outside.

Further, the joining of the abutting portions 17 in the winding of the metal plate 10A is a projection joining B because arc welding causes poor accuracy due to welding heat and a cost increase due to a large number of welding steps.

When the mere joint connection of the projection welding cannot be performed, the thin plate 12 is used for the projection connection B.

The thin plate 12 may be formed with a stopper 13 for preventing the worm wheel (see FIGS. 7 and 8) from rotating and having a stopper function at the same time.

[0023]

Since the present invention is configured as described above, it has the following effects.

Since the cam surface is formed by press working, the cam surface is formed smoothly, and the sliding resistance of the stopper that comes into contact with the cam surface is small, so that the operating torque can be stabilized, and therefore the quality of the operation can be improved. It is possible to improve.

Further, since the cam surface is press-worked so that cutting burrs do not occur, it is not necessary to remove the cutting burrs, and the cost can be economically reduced.

Further, since the burr portion is formed so as to be located outside, damage and sliding resistance due to the burr do not occur between the cam ring and the guide tube with which the cam ring slides, and the cam ring can be rotated and moved up and down. Operability is improved.

[Brief description of drawings]

FIG. 1 is a development view of a cam ring of the present invention.

FIG. 2 is a plan view of a cam ring according to the present invention.

FIG. 3 is a front view of a coupling portion of the cam ring of the present invention.

FIG. 4 is a front view of a coupling portion of a cam ring having a stopper function according to the present invention.

FIG. 5 is a plan view of a cam ring having a stopper function according to the present invention.

FIG. 6 is an enlarged cross-sectional view of a secondary cam ring during press working.

FIG. 7 is a partially cutaway front view of a conventional hydraulic shock absorber.

FIG. 8 is a cross-sectional view around a worm wheel of a conventional hydraulic shock absorber.

FIG. 9 is a plan view of a conventional cam ring.

FIG. 10 is a front view of a coupling portion of a conventional cam ring.

[Explanation of symbols]

 10 cam ring 10A metal plate 11 cam surface 12 thin plate 13 stopper 14 inside of cam ring 15 outside of cam ring 16 press blade B projection connection

Claims (1)

[Scope of utility model registration request] 1. A cam ring main body is formed by cutting a meat portion corresponding to a cam surface from a plate body by press working, and the cam ring main body is formed into a cylindrical shape with a burr portion generated at an end portion during press working outside. Cam ring structure characterized by butt joints joined by projection welding