KR20190033326A - Forging device of composite tooth profile clutch mono block and composite tooth profile clutch mono block made from the same - Google Patents

Abstract

The present invention relates to a tooth forging apparatus for a composite tooth clutch monoblock and a composite tooth clutch monoblock produced thereby. Provided are a tooth forging apparatus for a composite tooth clutch monoblock and a composite tooth clutch monoblock produced thereby, which reduce occurrence of a product failure, and eliminate the necessity to perform an additional work of removing a short ball. To this end, a protruding part is formed at a tip part of a tapering pin for shaping a reversely tapered shape, such that a remaining pad may be widely flattened overall on a bottom surface of a reversely tapered spur gear. Therefore, when a short blast process is performed as an after process, the short ball is prevented from being stuck on the bottom surface of the reversely tapered spur gear.

Description

TECHNICAL FIELD [0001] The present invention relates to a toothed forgery apparatus and a composite toothed clutch monoblock of a composite toothed clutch monoblock,

The present invention relates to a toothed gear of a composite toothed clutch monoblock and a composite toothed clutch monoblock. More particularly, the present invention relates to a composite toothed clutch monoblock which is manufactured by cold forging and then subjected to a subsequent process, The present invention relates to a composite toothed clutch monoblock and a composite toothed clutch monoblock capable of preventing a shot ball from being pinched in a bottom face of an inverse tapered spur gear of a composite toothed clutch monoblock when performing a reverse rotation of the toothed spur gear.

BACKGROUND ART Generally, a driving force required for a vehicle to travel is largely changed depending on a driving environment. Accordingly, a vehicle is provided with a transmission for changing a torque between an engine and a driving wheel. In a manual transmission, The speed of the vehicle, the speed of the vehicle, the degree of vehicle noise, and operates the clutch, which is a power interrupter, at the same time as the shifting operation.

The clutch monoblock included in the manual transmission is a member that is used when the speed of the vehicle is changed by being press-fitted into the speed gear and welded, and the power of the engine is sometimes transmitted or intercepted. The clutch monoblock rotates in conjunction with the sleeve. Gear clutch, coupling clutch, and the like. In the present invention, it is referred to as a clutch monoblock.

Referring to FIG. 1, a monoblock body d inserted into a main shaft a of an automobile is used together with a speed gear body s. Generally, the monoblock body d and the speed gear body s And the monoblock body (d) is press-fitted into the speed gear body (s) and then welded and integrated.

However, when the monoblock body (d) and the speed gear body (s) are molded separately and then press-fitting and welding are performed in a single body, there is a problem that the process becomes excessively long and a separate personnel and equipment for press- And the manufacturing cost is increased. In addition, since the two products are connected by welding, there is a problem that the flow of the metal is cut off at the welding site, and the durability is deteriorated.

In order to solve such a problem, recently, a method of manufacturing the monoblock body (d) and the speed gear body (s) into a composite tooth profile has been proposed. In the proposed technique, a composite tooth clutch monobloc is formed by integrally forming the speed gear body (s) and the noblock body (d), and the teeth are cut on the speed gear body of the composite tooth clutch monoblock by a subsequent process, A carburizing heat treatment and a shot blasting are carried out in a subsequent step to produce a gear in which the speed gear body s and the monoblock body d are integrally formed.

On the other hand, the clutch monoblock d has an inverse tapered spur gear to prevent a phenomenon that meshing with the sleeve is released easily during rotation, and the speed gear body s and the monoblock body d are integrated The monoblock body (d) also has an inverse tapered spur gear in the composite tooth clutch magnetic monoblock.

The step of manufacturing a composite toothed gear in which the speed gear body (s) and the monoblock body (d) are integrally formed is characterized in that the speed gear body and the monoblock body are integrally formed through a hot forging process, After the block is manufactured and the tooth precision of the spur gear having the straight type teeth formed on the outer peripheral surface of the clutch monoblock is improved through the cold forging process, the straight type tooth profile of the clutch monoblock is reversed tapered in the reverse tapered forging So as to form an inverted tapered spur gear having an inverted taper shape.

FIG. 2 is a view showing an inverse tapered spur gear of a monoblock body in a conventional composite toothed clutch monoblock. As shown in FIG. 2, in a known composite toothed clutch monoblock, A wedge-shaped valley portion 4 is formed on the tooth bottom surface 3 which is the bottom surface of the tooth groove between the teeth 1 of the reverse tapered spur gear. In the process of forming the straight type teeth in the reverse taper shape, the valleys 4 press the metal on the side ends of the teeth 1 between the teeth grooves to form the residual filling 2, Because the amount of the metal is different.

When the shot blasting process is carried out in a subsequent process in a state in which the wedge-like valleys 4 are formed, the short ball b (b) formed on the valley 4 formed on the bottom surface of the reverse tapered spur gear 1 of the clutch monoblock ) Is stuck.

When the short ball b is inserted into the trough portion 4 during the shot blasting process performed after the carburizing heat treatment, the short ball b does not easily come off and the product is defective, or the short ball b is pulled out Therefore, there is a problem in that the productivity is deteriorated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a taper pin for a reverse taper molding, in which a projecting portion is formed at the tip of a taper pin for reverse taper molding, Therefore, it is necessary to prevent the insertion of the short ball at the bottom face of the reverse tapered spur gear during the short blast process in the subsequent process, thereby reducing the occurrence of defective products and performing additional work to remove the short ball The present invention is to provide a toothed gear of a composite toothed clutch monoblock and a composite toothed clutch monoblock.

In order to achieve the above-mentioned object, the present invention is characterized in that a composite gear clutch monoblock having a body of a speed gear and a monoblock body formed by forming a spur gear on an outer circumferential surface thereof is seated on the gear teeth of the spur gear, Wherein a plurality of taper pins are radially disposed and each of the taper pins is movably mounted in a horizontal direction, wherein the composite tapered clutch mono-block is mounted on the lower mold; And an upper punch for pressing the rear surface of the taper pins to provide a moving force in a forward direction, wherein each of the taper pins of the reverse taper forming part is pushed in the direction of the teeth of the spur gear, And a protrusion protruding forward in the longitudinal direction is provided on a tip end portion of the taper pin so that the remaining remnant remaining on the tooth bottom surface of the spur gear is flattened The present invention provides a toothed gear of a composite toothed clutch monoblock.

In addition, the present invention is a compound tooth clutch monobloc formed integrally with a body of a speed gear and a monoblock body formed with an inverse taper spur gear on the outer circumferential surface thereof, wherein an inverse taper spur gear formed on the outer peripheral surface of the clutch monoblock, The present invention provides a composite tooth clutch monoblock having a reverse tapered portion whose width becomes narrower toward the upper direction toward the body of the speed gear and which is formed so as to flatten the entire remaining remnant on the tooth bottom surface between the teeth.

According to the composite toothed clutch monobloc and the composite toothed clutch monobloc according to the present invention having the above-described configuration, the protruding portion is formed at the tip of the taper pin of the reverse tapered portion, Since the residual film is flattened over the whole so that the shot ball used in the shot blasting process is not sandwiched between the seams, the shot ball is prevented from being pinched at the bottom surface of the reverse tapered spur gear of the composite-tooth clutch monobloc, In addition, since there is no need to perform additional work to take out the shot ball, the work time can be reduced.

1 is a view showing a coupling relationship between a general speed gear and a clutch monoblock.
2 is a view showing a state in which a short ball is inserted in a reverse tapered forging process of a composite tooth clutch monoblock according to the prior art.
3 is a cross-sectional view of a forging apparatus for explaining a cold forging process performed to improve the precision in the spur gear in the manufacturing process of the composite toothed clutch monoblock according to the present invention.
4 is a perspective view showing a spur gear forming section of a first lower mold according to the present invention.
5 is a view showing a tooth portion of a spur gear formed through a first step in a manufacturing process of a composite tooth clutch monoblock according to the present invention.
6a to 6c are views showing a reverse tapered forging process of the composite tooth clutch monoblock according to the present invention.
7 is a perspective view showing a taper pin of a reverse tapered molding part according to the present invention.
8 is a view for explaining an inverse tapered spur gear of a composite toothed clutch monoblock according to the present invention.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms are used only for the purpose of distinguishing one component from another. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the hot forging process performed in the previous step, the composite tooth clutch monoblock 10, in which the speed gear body 20 and the monoblock body 30 are integrated, is manufactured as a preform, A cold forging process is performed on the manufactured preform to produce a composite toothed clutch monoblock 10 having an inverse taper spur gear 120.

The speed gear body 20 and the monoblock body 30 are formed integrally with each other. In general, the speed gear body 20 has a body shape before the teeth are formed on the outer peripheral surface, The body 30 has a spur gear 11 formed on the outer circumferential surface thereof.

The cold forging process for manufacturing the composite tooth clutch monoblock 10 includes a first step S1 of a cold sizing process for improving the tooth profile accuracy of the spur gear 11 and a second step S1 of cold- The second step (S2) for forming the reverse taper spur gear 120 by forming the straight type tooth of the spur gear 11 so as to have the reverse taper with respect to the clutch monoblock 10 is performed.

3 to 5 are views for explaining the first step for improving the tooth-form accuracy of the spur gear 11 of the composite-type clutch monoblock 10.

Referring to FIG. 3, the forging device for improving the tooth accuracy of the spur gear 11 of the composite tooth clutch monoblock 10 includes a first lower mold 100 and a first upper mold 200.

The first upper mold 200 includes an upper punch 201 and an insert 202 formed at the center of the upper punch 201 and inserted into the hollow of the composite tooth clutch monoblock 10. The lower surface 203 of the upper punch 201 is brought into contact with the upper surface of the composite toothed clutch monoblock 10 to press the composite toothed clutch monoblock 10 to perform the forming.

Referring to FIG. 4, the first lower mold 100 includes a lower body 101, a hollow body 101 formed on the lower body 101, And a clutch insertion hole 102 having a spur gear forming portion 130. The spur gear forming portion 130 includes a plurality of spur gear forming grooves 103 formed along the inner circumference of the clutch insert hole 102. The spur gear forming grooves 103 are formed in a shape corresponding to the shape of the gear teeth 113 of the spur gear 11 and spaced apart from each other by a predetermined distance.

The composite toothed clutch monoblock 10 formed in the hot forging process is set on the first lower mold 100 and the first upper mold 200 is lowered to form the preformed clutch monoblock 10 The monobloc body 30 of the composite toothed clutch monoblock 10 is inserted into the clutch insert hole 102 of the first lower mold 100 so that the monoblock body 30 by cold- Tooth formation of the body 30 is performed.

The outer peripheral surface of the monoblock body 30 of the composite toothed clutch monoblock 10 is formed by the spur gear forming portion 130 formed on the clutch insertion hole 102 of the first lower mold 100 A spur gear 11 having a straight type tooth 113 with improved accuracy as shown in Fig. 5 is formed.

5, each tooth 113 of the spur gear 11 formed on the outer circumferential surface of the monoblock body 30 of the cold-sintered composite toothed clutch monoblock 10 through the first step has a side end 111, Each straight tooth 113 has a side surface portion 114 extending toward the tooth bottom surface 112 of the tooth groove between the inclined teeth 113. As shown in Fig. The tooth 113 has a wedge-shaped end 115 at its longitudinal end. Since each tooth 113 of the spur gear 11 is formed in a straight shape, it is possible to separate the first upper mold 200 after the first step and take it out to the upper portion of the composite tooth clutch monoblock 10 Do.

6A to 6C are views for explaining an inverse tapered type forging device of a composite toothed clutch monoblock according to the present invention. In a first step, a cold-sized composite toothed clutch monoblock 10 is subjected to straight- And the second step for forming the reverse taper spur gear 120 with the gear 11 in a stepwise manner.

The reverse tapered type forging device of the composite tooth clutch monoblock 10 according to the present invention includes a second lower mold 300 and a second upper mold 400.

The second lower mold 300 includes a lower body 301 on which a seat 302 is formed and a lower body 301 on which a spur And an inverse taper forming unit 500 for forming an inverse taper on each tooth 113 of the gear 11 to form an inverse taper spur gear 120.

7 is a view for explaining the shapes of the reverse taper forming portion 500 and the taper pin 510 of the reverse tapered type forging device of the composite toothed clutch monoblock according to the present invention, And a plurality of taper pins 510 disposed radially above the lower body 301 of the second lower mold 300 and being movable toward the center direction.

The composite tooth clutch monobloc 10 is mounted on the upper surface of the reverse tapered portion 500 in a state in which the speed gear body 20 of the composite tooth clutch monoblock 10 is supported, When the taper pin 510 is advanced in the lower portion of the speed gear body 20 supported while being supported in the horizontal direction, the taper pin 510 is inserted into the spur gear of the composite tooth clutch monoblock 10 11, the respective teeth of the spur gear 11 are inversely tapered.

The taper pin 510 is arranged to correspond to a position between the teeth of the spur gear 11 of the monobloc body 30 and has a trapezoidal shape in which the leading end portion 511 becomes narrower toward the lower side, The side surface of the teeth 113 of the spur gear 11 is pressed while being inserted between the teeth of the spur gear 11 so that an inverse taper is formed in the teeth 113 of the spur gear 11. When the upper punch 410 of the upper mold 400 descends, the rear end of the taper pin 510 comes into contact with the inner surface of the upper punch 410 to move forward, that is, to move toward the center of the lower mold. And an inclined surface 512 inclined outward toward the lower side.

The second upper mold 400 includes an upper body 401 and an upper punch 410 for providing a pressing force to move the taper pin 510 in a horizontal direction in contact with an inclined surface 512 of the taper pin 510 ). The upper punch 410 is integrally connected to a punch driving part 411 provided at the center of the upper body 401 and has a side end extending annularly surrounding the reverse tapered part 500, The inner side surface of the taper pin 510 contacts the inclined surface 512 of the taper pin 510 to move the taper pin 510 in the horizontal direction.

7, the tip 511 of the taper pin 510 of the reverse tapered part 500 according to the present invention has a protruding part 530 formed on a wide pressurizing surface at the upper part thereof do. The projecting portion 530 is formed by bending convexly in the width direction and pressing the side surface of each tooth 113 to reduce the projecting range from the upper portion to the lower portion, The metal on the side of each tooth 113 is pressurized between the teeth grooves to form a residual film 126. The protrusion 530 is formed in a region of the pressing surface A high pressing force is applied to the upper side of the wide tooth bottom surface so that the residual filling 126 is flattened as a whole and integrated with the pressing surface of the adjacent teeth 113. [

Therefore, it is possible to prevent the shot ball from being caught in the valley formed on the bottom surface of the spur gear 11 in the conventional shot blasting process.

The protruding portion 530 is formed in a curved shape as a whole, which is more advantageous from the viewpoint of prevention of molding and shot ball sticking.

 The process of stepwise forming the spur gear 11 and the reverse taper spur gear 120 in which the tooth profile accuracy is improved through the cold forging process of the composite tooth clutch monoblock according to the present invention will be described in detail.

 A method for manufacturing a composite monolithic clutch monobloc preform produced by a hot forging process, comprising the steps of: performing a first step S1 (S1) for improving the tooth profile accuracy of the spur gear 11 of the clutch monoblock 10 by a cold forging process; ) Positions the preformed body of the composite toothed clutch monobloc 10 manufactured through the hot forging process on the first lower mold 100 and moves the first upper mold 200 down to press the preform, The spur gear forming portion 130 of the lower mold 100 improves the accuracy of the spur gear 11 of the monoblock body 30 of the composite toothed clutch monoblock 10.

The spur gear forming groove 103 of the spur gear forming portion 130 is formed so that a side end 111 of each tooth 113 of the spur gear 11 is straight and extends straight, And the spur gear 11 of the toothed clutch monoblock 10 is precisely shaped by the cold-sizing method.

Each tooth 113 of the spur gear 11 of the composite toothed clutch monoblock 10 molded through the first step S1 has a side end portion 111 extending in the straight direction as shown in Fig. And a wedge-shaped chamfered portion 115 is formed at an end of the tooth 113 so that the sleeve can easily enter and engage with the tooth-shaped bottomed surface 112 of the tooth- do.

The second step S2 is a step of forming each tooth of the spur gear 11 of the composite toothed clutch monoblock 10 to have an inverse tapered gear 126 so as to have an inverse tapered spur gear 120, The block 10 is placed on the second lower mold 300 and the punch driving part 411 of the second upper mold 400 is driven to lower the upper punch 410, The taper pin 510 of the clutch monoblock 500 advances toward the center in the horizontal direction so that each tooth 113 of the spur gear 11 of the clutch monoblock 10 forms the reverse taper spur gear 120.

6A to 6C show steps in which the spur gear 11 is formed into the reverse tapered spur gear 120 in the second step S2. As shown in FIG. 6A, in the composite tooth clutch monoblock 10, The upper punch 420 presses the taper pin 510 in the horizontal direction so that the elastic member located at the lower end of the taper pin 510 520, and the spur gear 11 is formed into the reverse taper spur gear 120 while advancing.

More specifically, when the upper punch 410 of the second upper mold 400 contacts and slopes on the inclined surface 512 of each taper pin 510 of the reverse tapered portion 500, 510 are moved toward the center of the second lower mold 300 while being moved between the teeth 113 of the spur gear 11 of the composite toothed clutch monoblock 10. The shape of the taper pin 510 causes the metal of the outer portion contacting the tip of the taper pin 510 to be depressed toward the tooth bottom between the teeth 113 on the upper surface of the tooth 113, So that the reverse tapered spur gear 120 is formed.

6C, when the upper punch 410 of the second upper mold 400 is moved up, the upper punch 410 moves to the inclined surface 512 of the taper pin 510 of the reverse tapered portion 500, And at the same time, the taper pin 510 is returned to its original state by the restoring force of the elastic member 520.

8 is a view for explaining the shape of the reverse tapered spur gear of the composite toothed clutch monoblock after undergoing the reverse taper forming step.

The spur gear 11 shown in Fig. 5 is formed into the reverse tapered spur gear 120 shown in Fig. 8, and each tooth 123 of the reverse tapered spur gear 120 is fixed to the cogged clutch monoblock 10, Tapered portion whose width becomes narrower toward the upper direction toward the speed gear body 20 of the speed gear body 20 (width becomes wider toward the upper direction toward the speed gear body 20 in terms of the tooth groove).

In a process in which the teeth of the straight type spur gear 11 are formed by reverse taper by the taper pin 510, the molten metal moves to the teeth groove between the teeth 123 to form a residual joint 126 on the tooth bottom surface The residual film 126 is flattened by the protruding portion 530 of the taper pin 510 so as to be wider overall and integrated with the pressing surface of the adjacent tooth 113. That is, the tooth bottom surface is flattened by the projecting portion 530 formed on the tip end portion 511 of the taper pin 510, so that the shot ball is not caught, thereby preventing the shot ball from being caught in the tooth bottom in the shot blasting process .

As described above, according to the present invention, it is possible to prevent the formation of the wedge-shaped trough portion in which the shot ball is pinched by the step of forming the respective teeth of the spur gear 11 of the composite-type clutch monoblock 10 in the reverse taper, It is possible to prevent the shot ball from being pinched in the blast process.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It should be understood that various modifications made by the person skilled in the art are also within the scope of protection of the present invention.

10: Composite tooth clutch Monoblock 20: Speed gear body
30: monoblock body 100: first lower mold
120: reverse tapered spur gear 126:
200: first upper mold 300: second lower mold
400: second upper mold 410: upper punch
500: reverse taper forming part 510: taper pin
530:

Claims (6)

A toothed gear of a composite toothed clutch mono-block having a speed gear body and a monoblock body integrally formed with a spur gear formed on an outer circumferential surface thereof, the inverse taper being formed at each tooth of the spur gear, ,
A lower mold having a composite tapered clutch mono-block on which a plurality of taper pins are arranged in a radial direction and in which respective taper pins are movably installed in a horizontal direction; And
And an upper punch for pressing the rear surface of the taper pins to provide a moving force in a forward direction,
Wherein each of the taper pins of the reverse taper forming portion presses the outer peripheral portion of the teeth of the spur gear to form an inverse taper while the tip end portion is urged in a direction between the teeth of the spur gear, And a protruding protrusion is formed on the bottom surface of the spur gear so that the residual coating remaining on the bottom surface of the spur gear is formed to be flattened over the entire surface.
The method according to claim 1,
Wherein the protruding portion formed at the tip of the taper pin has an upper large pressing surface. 3. The method according to claim 1 or 2,
Wherein the protruding portion is formed to be convexly curved in the width direction and to have a protruding range reduced from the upper portion to the lower portion.
CLAIMS 1. A combined-tooth clutch monobloc formed integrally with a body of a speed gear and a monoblock body formed with an inverse-tapered spur gear on the outer surface,
The reverse tapered spur gear formed on the outer circumferential surface of the clutch monobloc has a reverse tapered portion whose width becomes narrower toward the upper direction toward the speed gear body, Wherein the first and second clutches are configured to be planarized.
5. The method of claim 4,
Wherein the protruding portion formed at the tip of the taper pin has an upper large pressing surface.
The method according to claim 4 or 5,
Wherein the protruding portion is formed to be convexly curved in the width direction, and the protruding portion is formed to be reduced from the upper portion to the lower portion.

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