JP5701180B2 - Synchronous clutch gear for double cone sync - Google Patents

Description

The present invention relates to a synchronous clutch gear for a double cone sync mainly used for a manual transmission of an automobile. Specifically, a clutch gear in which a dog clutch tooth separately formed is integrally coupled to the inner side of the outer circumferential helical tooth or spar tooth, and a plurality of window grooves are provided on the inner side of the dog clutch tooth circumferential row. In this regard, the present invention relates to a synchronous clutch gear for double cone sync, in which the tooth shape or tooth profile accuracy of the dog clutch teeth is improved by reducing the distortion after carburizing heat treatment of the thin dog clutch teeth as much as possible.

There are two types of manufacturing methods for clutch gears for general manual transmissions. One is to form a one-piece clutch gear by combining the helical teeth for deceleration or speed-up and the dog clutch teeth on the inner periphery. The other is to form the external helical tooth and the internal dog clutch tooth separately and combine them to form a composite clutch gear. These integral or compound gears will be described below. As a kind of dog clutch gear, there are a single cone type and a multi cone type. First, an overall view of a single cone type clutch gear having one cone friction surface is shown in FIG. 7, and the outer peripheral helical teeth 1 are twisted with respect to the axial direction, and this inner periphery is opposite to the axial direction. Dog clutch teeth 2 having tapered teeth are formed. For example, a recessed sink groove 4 is formed concentrically between the outer peripheral teeth and the inner teeth, and the root 24 of the dog clutch tooth 2 is formed up to the bottom plate surface of the sink groove 4. A frustoconical cone 5 protrudes coaxially on the inner peripheral side of the dog clutch tooth 2, and the shaft hole 3 penetrates the inner periphery vertically. The frustoconical outer peripheral surface of the cone 5 is finished as a friction surface by cold forging after turning, heat treatment, and then grinding. Next, the multi-cone type clutch gear will be described below. An overall view of a triple cone type clutch gear having three cone friction surfaces is shown in FIG. 8, and is provided with a plurality of notch grooves 61 penetrating through the thick section of the tip surface 51 of the cone 5. Further, a double cone type having two cone friction surfaces is shown in FIG. 9, and in the circumferential row of the dog clutch teeth 2, for example, a portion corresponding to three teeth of the dog clutch teeth 2 is excluded, and a chip groove 62 is formed. In addition, a double cone type clutch gear having two cone friction surfaces is shown in FIG. 10, and a flat concentric flange 8 is provided between the dog clutch teeth 2 and the cone 5, and this surface has a substantially rectangular shape. A window groove 63 is provided. FIG. 11 shows another double cone type clutch gear, which has a window groove 64 hollowed out in a substantially circular shape on the surface of the flange 8. These chip grooves or window grooves are formed by drilling or forging. The chip groove of the clutch gear in FIG. 9 is referred to as an open pocket type, and the window groove of the clutch gear in FIGS. 10 and 11 is referred to as a closed pocket type. The multi-cone of these clutch gears increases the total area of the cone part, and accordingly, the synchro capacity increases. In other words, the multi-cone clutch gear reduces the impulse between the shift operation force and the shift operation time. As a result, the shift operation force is reduced, so that the shift feeling is improved. The higher the engine, the higher the need for shift operability. In order to enable light and quick operation, a large sync capacity is required to reduce the synchronization time. A large synchro capacity can be obtained by changing from a single cone to a double cone, and further to a triple cone, and as the synchronization time is shortened, it can meet the needs for higher engine speed and higher output. In this way, there is a tendency of multi-cone due to market demand for shift performance. However, the triple cone, which is said to have the highest synchronization performance, increases the manufacturing cost due to the complicated structure. Considering the manufacturing cost of this triple cone and the synchro performance obtained from it, the double cone conversion, which is inferior in synchro performance but lower in cost, has been reconsidered. On the other hand, in the case of an external gear and an internal gear, it is advantageous in terms of manufacturing cost, but when external teeth and internal teeth are cut by machining, the relationship between the external dimensions of the external teeth and the external dimensions of the internal teeth. The gear cutting tool interferes and gear cutting is difficult.

Next, a description will be given of a composite clutch gear in which helical teeth and dog clutch teeth of external teeth are separately formed and combined. FIG. 12 is a plan view of the ring-shaped internal tooth block body W02 having the dog clutch teeth 2, and FIG. As illustrated, a plurality of chip grooves 65 are provided along the inner circumference of the ring shape. In this example, the internal tooth block body W02 is combined with an external tooth block body having helical teeth formed separately by, for example, laser or electron beam welding or spline coupling. Here, the window groove 64 has a circular cross section or a rectangular shape, and is formed by molding or punching by drilling or forging.

The details of the manufacturing process of the composite clutch gear in which the external helical tooth and the dog clutch tooth are formed separately will be described below with reference to the process diagrams of FIGS. The first half of the process is shown in FIG. 13, and the second half is shown in FIG. First, as shown in step (1) of FIG. 13, a cylindrical material W1 suitable for a clutch gear is obtained as a disc-like material W2 cut into a predetermined axial length by, for example, a billet shear as in step (2). . Next, as shown in step (3), the material W2 is heated to, for example, 1150 ° C. and subjected to hot forging to obtain a ring material W3 having a hole in the center. Next, as shown in step (4), the material W3 is annealed to give the material W4, and then, as shown in step (5), the material W4 is subjected to shot blasting, as shown in the material W5, and then to step (6). A material W6 is obtained by performing a bonderite treatment for applying a lubricant to the material W5. Next, as shown in a process (7), the raw material W7 by which the convex part W71 was formed upwards is obtained by performing cold forging to the raw material W6. Hereinafter, the post-process will be described with reference to FIG. As shown in step (8), a material W8 is obtained in which the internal dog clutch teeth 2 are formed on the outer periphery of the flange portion by cold forging. Next, as shown in step (9), the material W9 is obtained by turning the material W8 to remove the upper convex portion W71. Next, as shown in step (10), the material W10 is provided with a plurality of open pocket-type chip grooves W101 on the inner periphery by broaching the material W9. Next, as shown in the step (11), the material W10 is subjected to carburizing heat treatment to obtain the material W11. Next, as shown in step (12), the material W11 is subjected to hard turning to obtain an internal tooth block body W02 that is finished by chamfering the inner diameter and the like, and a circumferential row of dog clutch teeth 2 is formed on the outer periphery. A plurality of open pocket-type chip grooves W021 are formed on the inner periphery. Finally, as shown in step (13), the lower external tooth block body W01 manufactured separately is united by applying electron beam welding to the internal tooth block body W02 from above to obtain the clutch gear W. A circumferential row of helical teeth 1 is provided on the outer circumference, a circumferential row of dog clutch teeth is provided on the inner circumference, and a window groove 63 is provided on the inner side.

Here, W101 in the step (10) is an open pocket type groove lacking on the inner peripheral side, and carburizing heat treatment is performed in a state where the inner peripheral side is missing in step (11). However, the internal tooth block body W10 before the carburizing heat treatment has a thin disk shape, and the inner peripheral side is missing. Therefore, the internal tooth block body W10 is generally distorted during the carburizing heat treatment, and accordingly, the tooth profile of the dog clutch tooth 2 or the internal tooth block body W02 with poor tooth profile accuracy is formed.

With regard to these clutch gears, the applicant of the present invention relates to a composite gear block body (hereinafter referred to as a sinking helical monoblock body) in which the root of the inner dog clutch tooth sinks from the end surface of the outer helical tooth with respect to the axial direction. I have a proposal like this. This is a multi-cone type clutch gear. For example, a plurality of chip grooves are provided in a circumferential row of dog clutch teeth, and these chip grooves are formed by hot forging and cold forging. Alternatively, a plurality of window grooves are provided in a substantially rectangular shape on the flange surface, and these window grooves are formed by hot forging and cold forging (for example, see Patent Document 1). In addition, other applicants have proposed the following method for forming a recessed hole as a catching portion with respect to a clutch gear manufacturing apparatus. That is, a clutch gear manufacturing apparatus for manufacturing a clutch gear used in a multi-cone synchronizer, wherein the chamfer of the clutch gear having spline teeth formed on the outer peripheral surface thereof can be installed vertically upward. A die having a reverse taper tooth capable of forming a reverse taper on the spline tooth, a punch capable of depressing the clutch gear mounted on the die so that the spline tooth is pressed against the reverse taper tooth, and the punch A clutch gear manufacturing apparatus comprising: a knockout sleeve that receives the clutch gear that is pushed down by a pin; and a punch pin that forms a cone hole in a side surface of the clutch gear in a state where the spline teeth are pressed by the reverse tapered teeth (for example, , See Patent Document 2).

Utility model registration No. 3155682 JP 2009-39781 A

As described above, as represented by patent literature, the conventional synchronous clutch gear for double cone sync has the following problems.

In the case of forming a chip groove or a window groove by drilling, it takes time for processing, and swarf is generated, so that it takes time and effort to completely remove it. On the other hand, when forming a chip groove or window groove by forging, the window groove must be formed inside the dog clutch tooth circumferential row, so the cross-sectional thickness between the outer dog clutch teeth and the window groove is thin. Therefore, the wall that backs up the pressure for forging the dog clutch teeth is weakened. As a result, the pressure applied to the tooth profile escapes and it is difficult to ensure the tooth shape and tooth profile accuracy of the dog clutch teeth at this site. In particular, there is a problem when an internal tooth block body having a circumferential row of dog clutch teeth is formed by forging by the manufacturing process of FIGS. That is, when a plurality of open pocket-type chip grooves are formed on the inner peripheral side by machining, and then carburizing heat treatment is performed in this state, the inner tooth block body is a thin disk shape, and the inner peripheral side is chipped. ing. Therefore, the internal tooth block body is entirely distorted during the carburizing heat treatment, and in particular, the dog clutch tooth 2 tooth profile or the tooth profile accuracy is deteriorated.

Accordingly, the present invention has been made paying attention to the above-described problems, and an external tooth block body having a helical tooth or a spur tooth on the outer periphery is formed alone, and then a dog clutch tooth is formed inside this peripheral row. Basically, a thin internal tooth block body including Here, in order to eliminate distortion due to insufficient work rigidity in the thin internal tooth block body, a plurality of closed pocket type window grooves formed by forging are formed on the inner diameter of the thin internal tooth block body before joining. Carburizing heat treatment is performed in a state having a window groove frame or bottom plate, and then the inner peripheral frame and / or the bottom plate are scraped to reduce distortion of the thin internal tooth block body as much as possible. That is, the inner peripheral frame or / and the bottom plate of the closed pocket type window groove in the internal tooth block body is scraped off to form an open pocket type chip groove, and the thin internal tooth block body in this state is replaced with the external tooth block body. It is an object of the present invention to provide a synchronous clutch gear for double cone sync which is improved in the tooth shape or tooth profile accuracy of the dog clutch teeth by being combined inside.

Co Focusing on that good tooth profile accuracy of various shapes advances in forging technology in recent years, tooth by a carburizing heat treatment while having the frame or the bottom plate of the window grooves in the synchronizing clutch gear for double cone synchro Focusing on the fact that the generation of distortion is reduced, we have made a prototype of a gear and found that the dog clutch teeth have excellent tooth shape and tooth profile accuracy. The clutch gear of the present invention is embodied on the basis of such knowledge, and the invention of claim 1 is similar to that in which the carburized heat treatment is applied to the external tooth block body subjected to the carburizing heat treatment after the forging. In the synchronous clutch gear for a double cone sync united with the internal tooth block body, the external tooth block body is configured such that the shaft hole, the cone, the flange, and the external teeth are coaxially arranged from the inner side to the outer peripheral side, The internal tooth block body is a closed pocket type window groove having a single hole, a flange, and a dog clutch tooth coaxially formed from the inside to the outer peripheral side, and having an inner peripheral frame along the inner peripheral surface of the single hole. the carburizing heat treatment performed in a state where the provided plurality of portions, then by removing the inner circumferential frame of said Madomizo, chipping grooves open pocket is formed a plurality of locations on the inner peripheral surface, the outer tooth block body The outer peripheral surface of the cone, a synchronizing clutch gear for double-cone synchronizer, characterized in that the securing said inner peripheral surface of the inner tooth block body. According to a second aspect of the present invention, in addition to the feature of the first aspect, in the inner tooth block body, the open pocket type chipped groove is formed by removing a bottom plate and an inner peripheral frame of the closed pocket type window groove. It is a synchronous clutch gear for double cone synchronization characterized by being formed. The invention according to claim 3 is the synchronous clutch gear for double cone synchronization characterized in that, in addition to the feature of claim 1, the external teeth are spur teeth or helical teeth.

According to the present invention, the dog clutch tooth block body formed separately is integrally coupled to the inside of the external tooth block body having the outer helical teeth or the spur teeth, and a plurality of dog clutch tooth circumferential rows are arranged inside the dog clutch tooth circumference row. Since it is a synchronous clutch gear for double cone sync provided with a plurality of window grooves, it has the following effects. In a thin dog clutch tooth block body, the distortion of the dog clutch teeth can be reduced as much as possible by a manufacturing process in which carburizing heat treatment is performed in a state where the frame or bottom plate of the window groove is present and then the frame or bottom plate is scraped off.

It is a front-end process figure of the synchronous clutch gearwheel for double cone synchronization in Example 1 of this application invention. It is a post-process figure of the synchronous clutch gearwheel for double cone sync in Example 1 of this application invention. FIG. 5 is a perspective view of the entire clutch gear and a cross-sectional view taken along the line AB along the window groove, dog clutch teeth, and external teeth from the inner peripheral side. It is a perspective view which shows the dog clutch tooth block body in another clutch gear same as the above. FIG. 6 is a process diagram of the production of the synchronous clutch gear for double cone synchronization in the second embodiment. It is a post-process figure of manufacture of the synchronous clutch gearwheel for double cone synchronization in Example 2 same as the above. It is a perspective view of the synchronous clutch gearwheel for single cones by a prior art example. It is a perspective view of the synchronous clutch gearwheel for triple cones same as the above. It is a perspective view of the synchronous clutch gearwheel for double cones same as the above. It is a perspective view of the synchronous clutch gear for other double cones same as the above. It is a perspective view of the synchronous clutch gear for other double cones same as the above. It is a top view and sectional drawing which show only the dog clutch tooth | gear in the synchronous clutch gearwheel for other double cones same as the above. FIG. 4 is a pre-process diagram for manufacturing a synchronous clutch gear for double cone sync. It is a post-process figure of synchronous clutch gear manufacture for a double cone synchro same as the above.

Embodiments of the present invention will be specifically described below based on examples of the present invention illustrated in the accompanying drawings.

This embodiment will be described with reference to FIGS. FIG. 1 is a pre-process diagram of manufacturing a synchronous clutch gear for double cone synchronization in the first embodiment. FIG. 2 is a post-process diagram of manufacturing the synchronous clutch gear for double cone synchronization in the first embodiment. FIG. 3 is an overall perspective view of the clutch gear and a cross-sectional view taken along the line AB along the window groove, the dog clutch teeth, and the outer teeth from the inner peripheral side. FIG. 4 is a perspective view showing a dog clutch tooth block body in another clutch gear.

The manufacturing process of the clutch gear of the present embodiment will be described based on the process diagrams of FIGS. The upper process is shown in FIG. 1, and the lower process is shown in FIG. First, as shown in step (1) of FIG. 1, a cylindrical material W1 suitable for a clutch gear is obtained, and a disc-shaped material W2 cut into a predetermined axial length by, for example, a billet shear as in step (2) is obtained. . In this case, a steel material suitable for the clutch gear, for example, SC steel, SCR steel, SCM steel, SNC steel, SNCM steel, or the like can be used as the material of the material. Next, as shown in step (3), the material W2 is heated to, for example, 1150 ° C. and subjected to hot forging to obtain a ring material W3 having a hole in the center. Next, as shown in step (4), the material W3 is annealed to give the material W4, and then, as shown in step (5), the material W4 is subjected to shot blasting, as shown in the material W5, and then to step (6). A material W6 is obtained by performing a bonderite treatment for applying a lubricant to the material W5. Next, as shown in a process (7), the raw material W7 by which the convex part W71 was formed upwards is obtained by performing cold forging to the raw material W6. Hereinafter, the post-process will be described with reference to FIG. As shown in step (8), a material W8 is obtained in which dog clutch teeth 2 are formed on the outer periphery of the flange portion by cold forging, and a plurality of window grooves W81 having frames on the flange portion are provided. Next, as shown in step (9), the material W8 is obtained by turning the material W8 to remove the upper convex portion W71, and the closed pocket type window groove having the inner peripheral frame W911 on the flange portion. A material W9 is obtained in which W91 is provided at a plurality of locations along the inner peripheral surface of the block body. Next, as shown in step (10), the material W9 is subjected to carburizing heat treatment to obtain the material W10. Next, as shown in step (11), the inner peripheral frame W911 is scraped off by subjecting the material W10 to hard turning to remove the inner peripheral frame of the closed pocket type window groove. In this manner, an open pocket type chip groove W021 having an opening on the inner peripheral surface is formed at a plurality of locations on the inner peripheral surface of the block body, and an internal tooth block body W02 finished by chamfering the inner diameter is obtained. The inner tooth block body W02 has a central single hole W022 from the inner side to the outer peripheral side, a flange W023 on the outer periphery thereof, and dog clutch teeth 2 on the outer periphery thereof, which are coaxially formed along the inner peripheral surface of the single hole. And a plurality of open pocket-type chip grooves W021. Finally, as shown in step (12), the external tooth block body W01 that has been separately manufactured and machined and carburized is combined with the internal tooth block body W02 by electron beam welding or laser welding. The clutch gear W is obtained. That is, the inner peripheral surface of the inner tooth block body is fixed to the outer peripheral surface of the cone of the outer tooth block body. As shown in the figure, a circumferential row of helical teeth 1 is provided on the outer circumference, a circumferential row of dog clutch teeth is provided on the inner circumference, and a window groove 63 is provided on the inner side thereof. In the external tooth block body W01, the shaft hole, the cone, the flange, and the external teeth are coaxially formed from the inner side to the outer peripheral side. To summarize the above steps, step (3) is hot forging, and steps (7) and (8) are cold forging. Here, the closed pocket type groove is a window groove in which the inner peripheral surface side of the block body is also closed and surrounded all around, while the open pocket type groove has an opening on the inner peripheral surface side of the block body. It is a chip groove surrounded by the other periphery. The same applies to the other embodiments below.

FIG. 3 shows a detailed shape of the synchronous clutch gear W for double cone synchronization in which the external tooth block body W01 is joined from the outside to the internal tooth block body W02 formed in the step (11). FIG. 4A shows a perspective view of a double cone type clutch gear W in a sinking helical monoblock body in which the root of the internal dog clutch tooth sinks from the tooth end surface of the outer helical tooth in the axial direction. The outer peripheral helical teeth 1 are formed by being twisted in the axial direction, and the dog clutch teeth 2 having teeth that are reversely tapered in the axial direction are formed on the inner periphery. A recessed sink groove 4 is formed concentrically between these teeth, and the root 24 of the dog clutch tooth 2 is formed up to the bottom plate surface of the sink groove 4. A frustoconical cone 5 protrudes coaxially on the inner peripheral side of the dog clutch tooth 2, and the shaft hole 3 penetrates the inner periphery vertically. And the window groove 63 used as the principal part in a present Example is provided inside the circumference of the dog clutch tooth | gear 2, and the number of the window grooves 63 may be 3 or 6 places. The frustoconical peripheral surface of the cone 5 is finished as a friction surface by performing cold forging after turning, heat treatment, and then grinding. By applying electron beam welding or laser welding at the welded portion J to the arc portion where the cone 5 and the flange 8 are in contact with each other, the internal tooth block body W02 is fixed and united with the external tooth block body W01. A partial cross-section taken along the line A-B in FIG. 1A is shown in FIG. 2B, and the root of the dog clutch tooth 2 sinks to the bottom plate surface of the sink groove 4 and is formed upright. The periodontal row of the external tooth block body W01 described may be a helical tooth whose tooth trace direction is twisted in the axial direction, or a spur gear whose tooth trace direction is parallel to the axial direction.

Another embodiment of the internal tooth block body W02 is shown in FIG. The dog clutch tooth 2 of the internal tooth block body W02 is provided with a step 21 on the lower side of the chamfer portion. This step 21 has a function of stopping when the tip of the mating mating sleeve teeth comes into contact.

The double cone type clutch gear according to the present embodiment is configured as described above, and its operation will be described. In the thin dog clutch tooth block body, the carburizing heat treatment was applied in a state where the window groove was provided with the inner peripheral frame, and then the inner peripheral frame was scraped, so that the dog clutch tooth distortion could be reduced as much as possible. When the thin dog clutch tooth block body was subjected to heat treatment at a high temperature of 1000 ° C., the window groove adjacent to the dog clutch teeth was reinforced by the peripheral frame, so that the distortion of the dog clutch teeth could be reduced as much as possible.

This embodiment will be described with reference to the manufacturing process diagrams of the synchronous clutch gear for double cone synchronization in FIGS. The window groove of the internal tooth block body in a state where the carburizing heat treatment is performed is in a place having the bottom plate. Hereinafter, the differences from the first embodiment will be mainly described.

The first half of the process is shown in FIG. 5, and the second half is shown in FIG. Since the process (7) is the same as that of the first embodiment, the process (8) and subsequent steps will be described. As shown in step (8), by cold forging, a material W8 in which the internal dog clutch teeth 2 are formed on the outer periphery of the flange portion and the flange portion is provided with a plurality of closed pocket type window grooves W81 is obtained. . This window groove W81 has a bottom plate 812, which is different from the first embodiment. Next, as shown in step (9), the material W9 is obtained by turning the material W8 to remove the upper convex portion W71. The material W9 includes a plurality of closed pocket type window grooves W91 along the inner peripheral surface. Next, as shown in step (10), the material W9 is subjected to carburizing heat treatment to obtain the material W10. Next, as shown in step (11), the material W11 is obtained by scraping and removing the bottom plate from the window groove 91 having the inner peripheral frame W911 and the bottom plate 912 of the window groove W910 in the material W9. The material W11 is closed pocket. A plurality of mold window grooves W111 are provided along the inner peripheral surface of the block body. Next, as shown in step (12), the material W11 is subjected to hard turning to finish the inner diameter chamfering and the like, and the inner peripheral frame of the closed pocket type window groove is removed to open the inner peripheral surface. An internal tooth block body W02 having a plurality of open pocket-type chip grooves W021 formed on the inner peripheral surface is obtained. The internal tooth block body W02 includes a single hole W022, an outer peripheral flange W023, and an outer dog clutch tooth 2 coaxially formed from the inner side to the outer peripheral side, and along the inner peripheral surface of the single hole single hole W022. And a plurality of open pocket-type chip grooves W021. Finally, as shown in step (13), the external tooth block body W01 that has been separately manufactured and machined and carburized is fixed and combined by subjecting the internal tooth block body W02 to electron beam welding or laser welding. Then, the clutch gear W is obtained. That is, the inner peripheral surface of the inner tooth block body is fixed to the outer peripheral surface of the cone of the outer tooth block body. As shown in the figure, a circumferential row of helical teeth 1 is provided on the outer circumference, a circumferential row of dog clutch teeth is provided on the inner circumference, and a window groove 63 is provided on the inner side thereof. In the external tooth block body W01, the shaft hole, the cone, the flange, and the external teeth are coaxially formed from the inner side to the outer peripheral side.

The double cone type clutch gear according to this embodiment is configured as described above, and the operation will be described below. In the thin dog clutch tooth block body, carburizing heat treatment is applied with the inner peripheral frame and bottom plate of the window groove, and then the inner peripheral frame and bottom plate are scraped off, so the dog clutch tooth distortion is reduced as much as possible. I was able to. When the thin dog clutch tooth block body was heat-treated at a high temperature of 1000 ° C., the window groove adjacent to the dog clutch teeth was reinforced by the peripheral frame and the bottom plate, so that the distortion of the dog clutch teeth could be reduced as much as possible.

J welding part W clutch gear W01 external tooth block body W02 internal tooth block body, W021 chipped groove, W022 single hole, W023 flange W1, W2, W3, W4, W5, W6, W7, W8, W9, W10, W11 material W71 Convex W81 Window groove, W811 inner peripheral frame, W812 Bottom plate W91 Window groove, W911 inner peripheral frame, W912 Bottom plate W111 Window groove, W101 chipped groove, W111 window groove, W112 Inner peripheral frame 1 Helical tooth 12 Tooth surface, 14 Tooth end surface 2 dog clutch teeth 23 chamfer, 24 tooth root, 21 step 3 shaft hole, 30 rough shaft hole 4 sink groove 5 cone 61 notch groove, 62 notch groove, 63 window groove, 64 window groove, 65 notch groove 8 flange

Claims (3)

To the external tooth block that has undergone carburizing heat treatment after forging,
Similarly, in the synchronous clutch gear for the double cone sync that combines the internal tooth block body subjected to carburizing heat treatment after forging,
The external tooth block body is configured such that the shaft hole, the cone, the flange, and the external teeth are coaxially from the inner side to the outer peripheral side,
On the other hand, the inner tooth block body has a single hole, a flange, and a dog clutch tooth on the same axis from the inside to the outer periphery,
Carburizing heat treatment is performed with a plurality of closed pocket type window grooves having an inner peripheral frame along the inner peripheral surface of the single hole ,
Next, by removing the inner peripheral frame of the window groove, a plurality of open pocket-type chip grooves are formed on the inner peripheral surface,
On the outer peripheral surface of the cone of the external tooth block body,
A synchronous clutch gear for double cone sync, wherein the inner peripheral surface of the inner tooth block body is fixed. In the internal tooth block body, by removing the bottom plate and the inner peripheral frame of the window groove of the closed pocket type,
2. The synchronous clutch gear for double cone sync according to claim 1, wherein the chipped groove of an open pocket type is formed. The outer teeth, double-cone synchronizer clutch gear synchromesh according to claim 1, characterized in that the spar Hamata Wahe Li Cal teeth.

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