JPS6222700B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method and apparatus for manufacturing a clutch member having a reverse taper clutch pawl.

(Prior Art) In a clutch member used in a racing motorcycle such as a road racer, the clutch pawl protruding from the side surface of the clutch member is formed in a reverse taper shape with a thicker end, and has a structure that prevents so-called "clutch disengagement." It is said that

By the way, in the past, such a reverse taper clutch pawl was structurally formed by cutting using an end mill, etc., but recently, clutch members having this reverse taper clutch pawl are being applied to general commercial vehicles. As a result, the above-mentioned cutting process requires a large number of processing steps and is not suitable for mass production in terms of manufacturing cost, and there has been a demand for the development of an economical method for manufacturing clutch members suitable for mass production.

(Object of the Invention) The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to form a reverse taper clutch pawl by cold forging, thereby making it suitable for mass production and significantly reducing manufacturing costs. It is an object of the present invention to provide a method and apparatus for manufacturing a clutch member having an inversely tapered clutch pawl that can be used.

(Structure of the Invention) The method of manufacturing a clutch member of the present invention includes forming a material having a plurality of clutch pawl blanks disposed on the side surface at predetermined intervals in the circumferential direction by die forging, and then forming the clutch pawl blanks by die forging. A reverse taper molding part of a movable die that can be opened and closed in the radial direction is inserted between the shapes, and the tip of the clutch pawl blank is pressurized in the height direction of the clutch pawl blank with a fixed die to plastically deform it. This forms a reverse taper clutch pawl having a shape corresponding to the reverse taper molded portion.

In addition, in the clutch member manufacturing apparatus of the present invention, a movable die is provided in the center hole of the fixed die so as to be able to protrude and retract in the vertical direction. A plurality of inversely tapered molded parts are formed so as to be openable and closable in the radial direction, and are inserted between a plurality of clutch pawl blank parts to be machined arranged at intervals, and above the movable die. Punch means is provided to press the material placed on the material while moving the movable die back and forth, and a knock-out means for protruding the movable die in conjunction with the upward movement of the punch means is provided at the bottom of the center hole. It is provided in

(Example) Hereinafter, an example of the present invention will be described based on the drawings. A clutch member according to the present invention is shown in FIGS. 1 and 2, and the clutch member 1 has six clutch pawls 3 protruding from one side of a base 2 at equal intervals on the same circumference. It has a spline hole 4 in the part.

The clutch pawl 3 has both side surfaces 3a, 3a inclined at a predetermined inclination angle (for example, about 4 degrees) with respect to a vertical plane, as shown in FIG. 2, and is formed into a reverse taper with a thicker end. This clutch pawl 3 is the third
The clutch pawl element 6 is formed by swaging a clutch pawl element 6 protruding from one side of the base 2 of the raw material 5 as shown in FIGS. 5 and 4. The clutch pawl basic shape part 6
is formed by die forging, and both the inner circumferential surface 7 and the outer circumferential surface 8 are formed to correspond to the shape of the clutch pawl 3, and each surface is formed by die forging, so that a dropout slope is provided. cage, its height H
(See FIG. 4) is set to be slightly larger than the height H (see FIG. 2) of the clutch pawl 3 in consideration of the swaging process.

Further, FIGS. 5 to 7 show a manufacturing apparatus 9 for performing the above-mentioned swaging process, and the manufacturing apparatus 9
The main parts include a fixed die 10, a movable die 11, a punching means 12, and a knockout means 13.

The fixed die 10 has a center hole 14 in the center,
The movable die 11 is provided in the center hole 14 so as to be able to protrude and retract in the vertical direction, and an expansion pin 15 is provided on the center axis of the center hole 14.
is attached with a mounting bolt 16.

A bulging inner receiving mold 17 is provided at the tip of the expansion pin 15 to hold the inner circumferential surface 7 (see FIG. 3) of the clutch pawl element 6 of the material 5.

The movable die 11 has a shape as shown in FIG. 8, and has six die members 19 erected at equal intervals in the circumferential direction on an annular base 18 that loosely fits into the expansion pin 15. , the die member 1
An inverted tapered molded portion 20 is provided at the tip of 9. The reverse tapered molded portion 20 has tapered surfaces 20a, 20a that are inclined in correspondence with the side surface 3a of the clutch pawl 3 of the clutch member 1 (see FIG. 2), and each clutch pawl preformed portion 6 of the material 5, The structure is such that it is inserted between the holes 6 and 6 as shown in FIG.

Further, an inner protrusion 21 and an outer protrusion 22 are formed on both the inner and outer surfaces of the inverted tapered molded part 20, respectively, for opening and closing the inverted tapered molded part 20 in the radial direction. That is, the inner protrusion 21 comes into contact with the inner receiving mold 17 of the expansion pin 15 when the movable die 11 is projected, and expands the reverse tapered molded part 20 (see solid lines in FIGS. 5 and 7). On the other hand, the outer protrusion 22 contacts the inner circumferential surface of the center hole 14 when the movable die 11 is retracted and retracts, thereby contracting and closing the reverse tapered molded part 20 (see the two-dot chain line in FIGS. 6 and 7). It is said to be a structure.

In addition, as shown in FIG.
Pressurizing parts 23 are respectively provided inwardly protruding between the upper surfaces 23a of the pressing parts 23 and the fixed die 10.
The height between the upper surface 10a and the upper surface 10a is set to the height h of the clutch pawl 3 of the clutch member 1, as shown in FIG. The inner circumferential portion 24 of the center hole 14 corresponding to the pressurizing portion 23 forms an outer receiving mold for holding the outer circumferential surface 8 (see FIG. 3) of the clutch pawl preform 6 of the material 5.

The punch means 12 is for pressurizing the material 5 placed on the movable die 11.
It is installed above the unit so that it can be moved up and down using hydraulic pressure.

The knockout means 13 is for protruding the movable die 11 in conjunction with the upward movement of the punching means 12, and is provided in the bottom 27 of the center hole 14 so as to be movable up and down, and the knockout pins 25 of the knockout means 13... ... is the lower end surface 1 of the movable die 11
1a and supports it.

Next, a method of manufacturing the clutch member 1 will be explained.

(i) A material 5 as shown in FIGS. 3 and 4 is formed by die forging (preforming).

(ii) With the movable die 11 of the manufacturing device 9 protruding (see solid lines in FIGS. 5 and 7), the preformed material 5 is placed on the movable die 11.
are placed in such a manner that the inverted tapered forming portions 20 of the movable die 11 are inserted between the clutch pawl basic forming portions 6, 6 of the raw material 5 (see FIG. 9).

(iii) Lower the punching means 12 to remove the movable die 1.
The material 5 on top of 1 is pressurized. Then, as the punching means 12 descends, the movable die 1
1 retracts, the inverted tapered molding portions 20 contract and close (see the two-dot chain line in FIG. 7), and the material 5 is centered (see FIG. 10).

(iv) Furthermore, when the punch means 12 is lowered to the position shown in FIG. Pressure is applied in the height direction of the portion 6 to perform swaging processing. That is, at this time, since the inner circumferential surface 7 and outer circumferential surface 8 of the clutch pawl element 6 are held by the inner receiving mold 17 and the outer receiving mold 24, respectively, the clutch pawl element 6 pressurized by the pressure applying section 23 is The tip of the clutch pawl forming part 6 is crushed and plastically deformed, and the material of the raw material 5 flows into the space between the tapered surface 20a of the reverse taper forming part 20 and the clutch pawl forming part 6 ( (see FIG. 11), whereby the clutch pawl element 6 is formed into the reverse taper molded portion 2.
The product is formed into a reverse taper clutch pawl 3 having a shape corresponding to 0.

(v) Finally, when the punching means 12 is raised, at the same time, the knockout pins 25 of the knockout means 13 are raised, thereby protruding the movable die 11 and inversely tapered forming portions 20...
(see solid line in FIG. 7) and remove the product clutch member 1 from the movable die 11.

(vi) After that, repeat the operations (i) to (v) in order,
Clutch member 1 is mass-produced.

The base 2 of the clutch member 1 is then subjected to gear cutting and heat treatment by well-known means to form a transmission gear (not shown) equipped with a clutch pawl. Of course, the swaging process for 6 can be performed after the gear cutting process is completed.

(Effects of the Invention) As described in detail above, according to the manufacturing method of the present invention, after forming a material by die forging in advance, the clutch pawl preform portion of the material is swaged (cold forging).
Since it is formed into a reverse taper clutch pawl, it does not require cutting, which requires a large number of man-hours, making it efficient and suitable for mass production.

Further, according to the manufacturing apparatus of the present invention, the clutch member having the above-mentioned inverted taper clutch pawl can be manufactured continuously, mass production is possible, and manufacturing costs can be significantly reduced. Ideal for manufacturing clutch members used in

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention; FIG. 1 is a bottom view of the clutch member, FIG. 2 is a front view thereof, FIG. 3 is a bottom view of the material, FIG. 4 is a front view thereof, and FIG. FIG. 6 is a front sectional view showing the movable die of the manufacturing apparatus in a protruding state; FIG. 6 is a front sectional view showing the movable die in a retracted state; FIG. Fig. 8 is a perspective view showing the movable die, Fig. 9 is a partially imaginary plan view showing the relationship between the movable die and the clutch pawl forming part, and Fig. 10 is a view of the clutch pawl forming part before swaging. A sectional view taken along the line X--X in FIG. 9 showing the state, and FIG. 11 are views corresponding to FIG. 10 showing the state after the same swaging process. 1...Clutch member, 3...Clutch pawl, 5...
...Material, 6...Clutch claw preform, 9...Manufacturing device, 10...Fixed die, 11...Movable die,
12... Punch means, 13... Knockout means, 14... Center hole, 20... Reverse taper molded portion.

Claims (1)

[Scope of Claims] 1. A material having a plurality of clutch pawl preforms disposed on a side surface at predetermined intervals in the circumferential direction is formed by die forging, and then the clutch pawl preforms are opened and closed in a radial direction between the clutch pawl preforms. Insert the reverse taper forming portions of the movable dies, respectively, and press the tip of the clutch pawl preformed portion with a fixed die in the height direction of the clutch pawl preform to plastically deform it, thereby forming the reverse taper molding. 1. A method of manufacturing a clutch member having an inversely tapered clutch pawl, the method comprising: molding an inversely tapered clutch pawl having a shape corresponding to the shape of the clutch pawl. 2. A movable die is provided in the center hole of the fixed die so as to be able to protrude and retract in the vertical direction, and at the tip of the movable die, a plurality of processing blocks are arranged at predetermined intervals in the circumferential direction on the side surface of the material. A plurality of inversely tapered molded parts are formed to be inserted between the clutch pawl blank parts to be opened and closed in the radial direction, and above the movable die, the raw material placed on the movable die is retracted from the movable die. A punch means for applying pressure while inserting the die is provided so as to be movable up and down, and a knock-out means for protruding the movable die in conjunction with the upward movement of the punch means is provided at the bottom of the center hole. A manufacturing device for a clutch member having a tapered clutch pawl.