JP2782364B2 - Method of manufacturing block ring for synchronous mesh transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of the Invention The present invention relates to a block ring for a synchronous mesh transmission, and more particularly, to a short cylinder having a tapered hole surrounding a cone of a transmission gear. The present invention relates to a method for manufacturing a block ring including a body and a plurality of teeth projecting from an outer peripheral surface of one end of the short cylindrical body.

(2) Conventional technology Conventionally, this kind of block ring is manufactured through several steps by applying a press forging method or the like.

(3) Problems to be Solved by the Invention However, according to the conventional method, there is a problem that the steps are complicated, mass productivity is poor, and the manufacturing cost of the block ring increases.

In view of the above, an object of the present invention is to provide the above-described manufacturing method capable of obtaining a block ring by one plastic working.

B. Configuration of the Invention (1) Means for Solving the Problems According to the present invention, a short cylinder having a tapered hole surrounding a cone of a transmission gear, and one end of the short cylinder protruding from the outer peripheral surface. In manufacturing a block ring for a synchronous mesh transmission including a plurality of teeth, an outer peripheral portion of a metal annular material is provided with a first cutting member provided on a punch and a second cutting member provided on a die.
While being clamped by the cutting member, the inner peripheral portion of the metal material is bent by the punch to form a tubular portion corresponding to the short tubular body, and the outer peripheral surface of one end portion of the tubular portion is formed. Forming a flange portion, and then performing a shearing process on the flange portion in cooperation with the first cutting member and the second cutting member to form a plurality of tooth profiles corresponding to the plurality of tooth portions; The punch, the die and the first
In the short cylinder molding cavity defined by the cooperation of the cutting member, and in each tooth profile, in each tooth molding cavity defined by the cooperation of the first and second cutting members, respectively. It is characterized in that the short cylinder and each tooth portion are formed by compression.

(2) Action According to the above method, one block ring is formed from the annular material.
Manufactured by plastic working.

(3) Embodiment FIG. 1 shows a part of a known synchronous meshing type transmission, in which a driven gear 2 as a transmission gear rotatably supported on a main shaft 1 is fitted to a sub shaft 3. Gear 4 is engaged.
A sleeve 6 meshes with a hub 5 fitted on the main shaft 1, and a metal block ring 8 is interposed between the hub 5 and the cone 7 of the drive gear 2.

The block ring 8 has a short cylindrical body 10 having a tapered hole 9 surrounding the cone 7 of the drive gear 2 as shown in FIGS. 2 to 4, and protrudes from an outer peripheral surface of one end of the short cylindrical body 10. And a plurality of tooth portions 11 formed. A plurality of paper-based friction material segments 12 are bonded to the tapered hole 9 of the short cylindrical body 10 with an oil groove 13 between adjacent ones. The block ring 8 in FIGS. 2 to 4 is just after the plastic working, and therefore the chamfer of the friction material segment 12 and the opening edge of the tapered hole 9 is omitted.

In FIG. 5 to FIG.
Is provided with _one upper processing block 15 for producing the block ring 8 mutually cooperates with the lower processing block 15 _2.

Upper machining block 15 ₁ is constructed as follows.

That is, the punch holder 17 is attached to the lower surface of the elevating plate 16, and the punch 18 is held by the punch holder 17. The punch 18 comprises a cylindrical main body 19 and a frustoconical processing part 20 continuously provided at the lower end of the main body 19, the upper end of the main body 19 is held by the punch holder 17, and the tapered surface 21 of the processing part 20 is a block. It corresponds to the tapered hole 9 of the ring 8. The processed portion 20 is formed such that its large-diameter end is located at the upper part and the small-diameter end is located at the lower part.

As shown in FIG. 6, a sliding hole 22 having a cross shape in a horizontal plane is formed in a vertically intermediate portion of the punch holder 17, and a guide member 23 having the same shape as the sliding hole 22 is formed in the sliding hole 22.
Are slidably fitted.

The body 19 of the punch 18, the first cutting member 24 ₁ short cylindrical is slidably fitted, and the guide member 23 and the first cutting member 24 ₁ thereof, through the bottom wall 25 of the slide hole 22 Are connected via four guide pins 26.

A through hole 28 is formed in the upper wall 27 of the sliding hole 22, and the through hole 28
A spring 29 is contracted between the lower surface of the elevating plate 16 and the upper surface of the guide member 23 through 28. Therefore, the upper working block 15 ₁
Is raised, the guide member 23 is moved by the elastic force of the spring 29 to the bottom wall 25.
, The lower surface of the punch holder 17 and the first cutting member 24 ₁
Between the upper surface a predetermined distance d is formed, also the lower end surface of the first cutting member 24 ₁ is located on the lower end face substantially flush with the punch 18.

The first cutting member 24 ₁ has an upper large-diameter portion 30 and a lower small-diameter portion 31.
A plurality of notch grooves 32 are formed in the outer periphery of the lower end of the small diameter portion 31 so as to open outward and downward in the radial direction. Each notch groove 32 corresponds to each valley portion 33 between both adjacent tooth portions 11 of the block ring 8, and each adjacent notch groove 32
Each land portion 34 between them corresponds to each tooth portion 11 of the block ring 8.

The U-shaped lower end opening edge of each notch groove 32 functions as a cutting blade 35.

Lower processing block 15 ₂ is constructed as follows.

That is, the die 38 is provided on the upper surface of the fixing plate 37 on the base 36.
The die 38 is composed of a short cylindrical outer cylinder 39 and a cradle 40 located inside the outer cylinder 39.

The outer cylindrical body 39 has an upper large-diameter hole 41 and a lower small-diameter hole 42, and the receiving table 40 is slidably fitted in the small-diameter hole 42,
Also so that the small diameter portion 31 of the first cutting member 24 ₁ to the large-diameter hole 41 can fit.

As shown in FIG. 7, a plurality of notches 44 are formed in the annular stepped portion 43 between the large-diameter hole 41 and the small-diameter hole 42 so as to open radially inward and upward. Each notched groove 44 first cutting member 24 _first engages the respective land portions 34, also phase Tonariru each land portion 45 between both the notched groove 44 is first cutting member 24 ₁ of the groove 32-out each notch Can be fitted.

Upper edge forming a C-shape of each land portion 45 functions as a cutting blade 46, so that each notched groove 44 and the land portions 45 constituting the second cutting member 24 _2. The first cutting member 24 each notched groove 44 of the land portion 34 and the second cutting member 24 _{2 1} defines a mutually cooperate with each tooth molding cavity.

The inner end of each land portion 45 is located radially outward of the inner peripheral edge of the stepped portion 43, and the outer end is connected to the inner peripheral surface of the large-diameter hole 41.

The upper surface of the cradle 40 includes a flat outer peripheral annular surface 47 and a concave surface 48 surrounded by the outer peripheral annular surface 47. The concave surface 48 is a punch
Functions as a stopper by processing unit 20 lower end fitting 18, also the outer peripheral annular surface 47 cooperates with the tapered surface 21, within the small-diameter hole 42 periphery and the first cutting member 24 ₁ lower end surface of the processing member 20 Thus, a cavity for molding a short cylinder is defined.

Sliding holes 49 are formed in a series on the base 36 and the fixing plate 37,
A knockout pin 50 connected to the cradle 40 is slidably fitted in the sliding hole 49.

Next, a method of manufacturing the block ring 8 at the manufacturing position 14 will be described.

As shown in FIG. 8, a blank is obtained by punching a metal plate. In this case, the outer diameter of the annular material B is substantially equal to the inner diameter of the large-diameter hole 41 of the die 38, and the width is determined according to the length of the teeth 11 of the block ring 8 and the length of the short cylinder 10. .

As shown in FIGS. 9 (a) and 9 (b), the annular blank B at normal temperature is fitted into the large-diameter hole 41 of the die 38, and the outer periphery thereof is placed on the upper surface of each land 45. In this case, the inner peripheral portion of the annular material B protrudes from the upper surface of the concave surface 48 of the die 38.

Figure 10 (a), (b), the the lowered upper machining block 15 _1, the lower end surface of the first cutting member 24 ₁ is in contact with the outer peripheral portion of the annular material B, and its outer peripheral portion a 2 cutting members 24
₂ between each land 45.

As shown in FIG. 11, the more descent of the first cutting member 24 ₁ is prevented by the respective land portions 45, annular material punch 18 is lowered while sliding relative to the first cutting member 24 ₁ B Bend the inner circumference of the bottom downward.

As shown in FIG. 12, when the lower end surface of the punch 18 has passed through the outer peripheral annular surface 47 of the cradle 40,
Cylindrical portion b ₁ corresponding to 10 flange portion b ₂ is formed on the upper surface outer peripheral surface of the cylindrical portion b ₁ while being molded.

As shown in FIGS. 13 (a) and 13 (b), the punch holder 17
The lower end surface the first cutting member 24 ₁ is pushed down by contacting the first upper end surface of the cutting member 24 _1, each cutting blade 35 and the second cutting member 24 ₂ of the cutting blade 46 Collaboration with shearing the flange portion b ₂ is applied by a plurality of teeth portions b ₃ corresponding to the plurality of teeth 11 are formed.

The first respective land portions 34 of the cutting member 24 ₁ is fitted into the second cutting each notched groove 44 of the member 24 _2, and the second cutting member 24 ₂
Each land portion 45 of fitting to the first cutting member 24 ₁ of the notched groove 32, the toothed portion b ₃ is pushed into the notched groove 44 of the second cutting member 24 _2, whereas, Neighboring that scrap s that occurred between the two toothing b ₃ is accommodated in the first cutting member 24 ₁ of the notched groove 32.

FIG. 14 (a), (b), the concave surface 48 of the punch 18 is receiving stand 40 by lowering the subsequent upper machining block 15 ₁
Fitted to, the descent stops the block 15 _1. Until the stop, the taper surface 21 of the punch 18 and the die
38 small diameter hole 42 inner peripheral surface, outer peripheral annular surface 47, first cutting member 24 ₁
Made short tube bodies forming cavities c ₁ is fractionated by cooperation of the lower end surface of the compression process to the cylinder portion b ₁ is performed in the inside cavity c _1, the short cylindrical body 10 is molded. At the same time, the first cutting member
24 ₁ of the notched groove of the land portion 34 and the second cutting member 24 ₂
With the cooperation of 44, each tooth molding cavity c ₂ is defined,
Since the compression process in the toothing b ₃ in the cavity c ₂ is performed, the tooth portion 11 is molded.

C. Effects of the Invention According to the present invention, it is possible to obtain a block ring by performing a single plastic working on an annular material, thereby improving the mass productivity of the block ring and reducing its manufacturing cost. Can be. In addition, in terms of implementation facilities, there is an advantage that the manufacturing apparatus can be reduced in size as the manufacturing process is simplified.

[Brief description of the drawings]

1 is a cutaway side view of a main part of a synchronous mesh type transmission, FIG. 2 is a plan view of a block ring, and FIG. 3 is FIG.
FIG. 4 is a perspective view of the block ring, FIG. 5 is a vertical sectional front view of the block ring manufacturing apparatus, and FIGS. 6 and 7 are views taken along arrows VI-VI and VII-VII in FIGS. FIG. 8 is a perspective view of the annular material, and FIGS. 9 to 14 are diagrams for explaining the manufacturing process of the block ring. B: annular material, b ₁ … tubular part, b ₂ … flange part, b ₃ …
… Tooth profile, c ₁ … cavity for molding a short cylinder, c ₂ … cavity for molding a tooth, 2… drive gear (transmission gear), 7…
... cone, 8 ... block ring, 9 ... tapered hole, 10
…… Short cylinder, 11… Tooth, 18… Punch, 24 ₁ , 24 ₂ ……
First and second cutting members, 38 dies

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B21K 1/30

Claims (1)

(57) [Claims] 1. A synchronous mesh type transmission comprising: a short cylinder having a tapered hole surrounding a cone of a transmission gear; and a plurality of teeth projecting from an outer peripheral surface of one end of the short cylinder. In manufacturing the block ring, the outer peripheral portion of the metal annular material is separated from the first cutting member provided on the punch and the second cutting member provided on the die.
In the state of being clamped by the cutting member, the inner peripheral portion of the metal material is bent by the punch to form a tubular portion corresponding to the short tubular body, and an outer peripheral surface of one end portion of the tubular portion is formed. Forming a flange portion, and then performing a shearing process on the flange portion in cooperation with the first cutting member and the second cutting member to form a plurality of tooth profiles corresponding to the plurality of tooth portions; The punch, the die and the first
In the short cylinder molding cavity defined by the cooperation of the cutting member, and in each tooth profile, in each tooth molding cavity defined by the cooperation of the first and second cutting members, respectively. A method of manufacturing a block ring for a synchronous mesh transmission, wherein the short cylinder and each tooth portion are formed by performing compression processing.