JPH076528U - Synchro gear for transmission - Google Patents

Abstract

(57) [Summary] [Purpose] In a synchronizer that forms a synchronized state by bringing the tapered surfaces of the synchronizer cone and synchronizer ring into contact with each other, simplifies the manufacture of the cone and reduces the friction material formed on the tapered surfaces of the cone and ring. Secure stable performance. [Structure] A friction material 5 made of synthetic resin is integrally formed on the tapered surface 4 of the synchronizer ring 2 by injection molding,
The friction material 5 is connected to the hole 6 that penetrates the inner and outer diameters of the ring 2 to prevent the friction material 5 from coming off. The synchronizer cone 1 is formed by a steel plate press, and heat treatment and grinding are omitted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a synchronizer device used for a manual transmission of an automobile or the like, and more particularly to an improvement of a synchronizer ring and a tapered surface of a synchronizer cone which are in contact with each other to perform a synchronous operation, and a friction material which covers the tapered surface. It

[0002]

[Prior art]

 Generally, in a manual transmission of an automobile, a synchronizing device is arranged on one side of the transmission gear so that the transmission gear can be smoothly changed.

FIG. 1 shows an example of a single cone type synchronizer, in which teeth 22 are provided on the outer periphery of a hub 21 which is prevented from rotating with respect to the output shaft 20, and sliding is provided outside the hub 21. Teeth 24 that mesh with the teeth 22 are provided on the inner circumference of the attached sleeve 23. Further, a clutch gear 26 is arranged on one side of the transmission gear 25 rotatably provided outside the output shaft 20, the synchronizer cone 1 is attached to the side surface of the clutch gear 26, and the clutch cone 26 is provided outside the cone 1. A taper surface 4 is formed on the inner diameter side of the synchronizer ring 2.

In this structure, the synchronizer ring 2 is moved toward the synchronizer cone 1, and the tapered surface 4 of this ring 2 and the tapered surface 3 provided on the outer diameter side of the synchronizer cone 1 are brought into contact with each other. The synchronizer ring 2 and the sleeve 23 are rotated synchronously with the transmission gear 25, and in this state, the teeth 24 of the sleeve 23 are engaged with the outer peripheral teeth 27 of the synchronizer ring 2 and the teeth 28 of the clutch gear 26 to rotate the transmission gear 25. Is transmitted to the output shaft 20 via the hub 21.

On the other hand, the synchronizer cone has a double structure as shown in FIG. 2 so that the shift operation for shifting can be performed lightly and smoothly in response to an increase in the load applied to the transmission as the engine output increases. The double cone type is considered.

In this double cone system, two synchronizer cones 1 and 1'are provided on the inner diameter side of the synchronizer ring 2 and a plurality of friction taper surfaces 3 and 3'which come into contact with each other are provided to increase the synchronization capacity and synchronize. It is designed to reduce the operating force.

In the above-mentioned single cone and double cone type synchronizer, the contacting tapered surfaces 3 and 4 of the synchronizer cone 1 and the synchronizer ring 2 have a high shape and Dimensional accuracy, sufficient strength to withstand deformation during contact, and the ability to generate a constant and stable frictional force during contact are required.

For this reason, the conventional synchronizer cone 1 is formed by hardening a steel material such as structural carbon steel by heat treatment, and the taper surface 3 is ground so that the taper angle and the like have a high accuracy. Well managed and finished.

Further, in the case of the single cone type so that a constant frictional force can be exerted at the time of contact, a friction material 31 is attached to the tapered surface 4 of the synchronizer ring 2 as shown in FIG. In this case, as shown in FIG. 8, the friction material 32 is attached to the inner and outer tapered surfaces 3 and 3 ′ of the synchronizer cone 1. As the friction materials 31 and 32, sandpaper-shaped materials having a high friction coefficient are conventionally used, and they are adhered to the tapered surfaces 3, 3 ′ and 4 with an adhesive, and these friction materials 31 and 32 are interposed. By doing so, it is possible to increase the synchronization capacitance more than the contact between metals.

[0010]

[Problems to be solved by the device]

 However, in the conventional structure as described above, it is necessary to manufacture the synchronizer cone 1 through a large number of steps such as heat treatment, grinding, and friction material sticking, and high accuracy control is required for grinding. Therefore, there is a problem that it takes a lot of time and effort to manufacture and the manufacturing cost becomes high.

[0011] Further, the friction materials 31 and 32 that are attached by adhesion are good in the initial stage of use, but the adhered state with the taper surface may peel off when the use is continued, and thus the durability and reliability of the synchronizing device are improved. Had a problem on.

Therefore, an object of the present invention is to solve the above problems, to provide a synchronizer device capable of simplifying the production of a synchronizer cone or a synchronizer ring and maintaining stable performance of a friction material.

[0013]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention integrally forms a synthetic resin friction material by injection molding on one tapered surface of the synchronizer ring or the synchronizer cone, and the friction material is formed on the tapered surface or the tapered surface. The structure is continuous with the locking recess formed near the surface.

The locking recess may be a hole extending in the radial direction from the tapered surface, or an annular groove provided in an end surface that intersects the tapered surface in the radial direction.

In addition, a groove for introducing a lubricant may be provided on the surface of the friction material.

[0016]

[Action]

 As described above, if a synthetic resin friction material is integrally formed on the tapered surface by injection molding, it is possible to form a friction surface with an optimum friction coefficient with high accuracy, from the manufacture of the synchronizer cone to heat treatment and grinding. It is possible to omit processes such as processing and attaching friction materials.

Further, by continuing the friction material in the locking recess formed on the tapered surface, the friction material can be reliably prevented from coming off, and the friction material can be prevented from coming off during use.

[0018]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to the attached FIGS. FIG. 3 shows an example in which a friction portion 5 made of synthetic resin is integrally formed on the tapered surface 4 of the synchronizer ring 2 in a single cone type synchronizer. In this example, in order to prevent the friction material 5 formed on the tapered surface 4 from peeling off, the ring 2 is formed with a hole 6 that connects the inner diameter surface 2a and the outer diameter surface 2b, and the hole 6 is continuous with the hole 6. The friction material 5 is formed so as to cover the outer surface of the ring 2. Reference numeral 1 is a synchronizer cone having a tapered outer diameter surface 3 that is in contact with the ring 2, and flanges 7 and 8 are formed on the ring 2 and the cone 1, respectively. Teeth are formed on the outer peripheral side.

The synthetic resin forming the friction material 5 is required to have characteristics of good torque follow-up with respect to load and high dynamic friction / static friction coefficient. Low fluctuation is required. As the synthetic resin having such characteristics, a phenolic resin containing an additive can be used.

FIG. 4 shows an example in which the present invention is applied to a synchronizer cone in a double cone type synchronizer. The cone 1 is composed of a stopper portion 9 that is locked to a gear dog (not shown) and a tapered cylindrical portion 10. The inner diameter surface 10a and the outer diameter surface 10b of the tapered cylindrical portion 10 are made of a friction material made of synthetic resin. 11 is integrally molded.

Further, a hole 12 that connects the inner diameter surface and the outer diameter surface of the cone 1 is formed in the cylindrical portion 10, and the resin layer of the friction material 11 is connected to the hole 12 to allow the friction material 11 to move to the cone 1. It adheres firmly and the problem of peeling disappears. The cone 1 in this example is formed by a steel plate press and is not heat-treated.

FIG. 5 shows that, in the embodiment of FIG. 4, lubricating grooves 11 into which a lubricant is introduced are formed in the friction material 11 on the inner diameter surface of the synchronizer cone 1 in the axial direction and the circumferential direction, respectively. . The other parts are denoted by the same reference numerals as in the example of FIG. 4, and the description thereof is omitted.

FIG. 6 shows another embodiment, in which the annular grooves 14 and 15 are formed on the end surfaces 2c and 2d of the synchronizer ring 2, respectively, and the friction material 16 formed on the inner diameter surface 2a is used to form the annular grooves 14 and 15, respectively. The resin layer is formed continuously from 15. By thus continuing the resin layer in the annular grooves 14 and 15, the friction material 16 can be held more firmly. The above-mentioned lubricating groove 13 may be formed on the inner diameter surface of the friction material 16 by injection molding.

[0024]

【effect】

 As described above, in the synchronizer according to the present invention, the friction material formed on the tapered surface of the synchronizer cone and the ring is made of synthetic resin and is continuously formed integrally with the locking recess. The following unique effects can be achieved.

Since the friction material is integrally injection-molded, it can be firmly fixed to the tapered surface, and the durability is improved.

The introduction groove of the lubricant can be integrally formed on the surface of the friction material by injection molding, which is advantageous in terms of cost for forming the friction material.

Since a process such as heat treatment and grinding process is not required for manufacturing the synchronizer cone, and the cone can be easily formed by a steel plate press or the like, the manufacturing process can be simplified and the manufacturing cost can be reduced. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a single cone type synchronizing device.

FIG. 2 is a sectional view showing a double cone type synchronizing device.

FIG. 3 is a sectional view showing an example.

FIG. 4 is a sectional view showing a synchronizer cone according to another embodiment.

FIG. 5 is a sectional view showing a synchronizer cone of another embodiment.

FIG. 6 is a cross-sectional view showing a synchronizer ring of another embodiment.

FIG. 7 is a sectional view showing a conventional synchronizer ring.

FIG. 8 is a sectional view showing a conventional synchronizer cone.

[Explanation of symbols]

 1, 1'Synchronizer cone 2 Synchronizer ring 3, 3'Tapered surface 4 Tapered surface 5, 11, 16 Friction material 6, 12 Hole 13 Lubrication groove 14, 15 Annular groove 21 Hub 22 Outer peripheral tooth 23 Sleeve 25 Speed change gear 26 Clutch gear

Claims (5)

[Scope of utility model registration request] 1. A hub is provided on the outside of the hub so as to slidably mesh with teeth on the outer circumference of the hub, and the sleeve and the synchronizer cone attached to the transmission gear are in contact with the synchronizer cone via a tapered surface. In a synchronizer for a transmission, in which a synchronizer ring is provided, and the sleeve and the transmission gear are synchronously rotated by bringing the synchronizer cone and the ring into contact with each other, one taper surface of the synchronizer ring or the synchronizer cone is made of synthetic resin by injection molding. A synchronizing device for a transmission, characterized in that a friction material is integrally formed and the friction material is continued to the locking surface or a locking recess formed in the vicinity of the tapered surface. 2. The synchronizing device for a transmission according to claim 1, wherein the locking recess is a hole extending in a radial direction from a tapered surface. 3. The synchronizing device for a transmission according to claim 1, wherein the locking recess is an annular groove provided on an end face that intersects the taper surface in the radial direction. 4. The synchronization device for a transmission according to claim 1, wherein a groove for introducing a lubricant is provided on the surface of the friction material. 5. A second cone, which is in contact with the synchronizer cone via a tapered surface, is provided inside the synchronizer cone, and the inner and outer tapered surfaces of the synchronizer cone are in contact with the second cone and the synchronizer ring. 5. The synchronizing device for a transmission according to claim 1, wherein the friction material is molded into the friction material.