JPH04106518U - Synchronous meshing device for transmission - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce wear on the rollers of a roller bearing during synchronous rotation in a synchronous meshing device of a transmission. [Structure] Gears (2) and (3) are mounted on roller bearings around the shaft (1).
(4) and (5), the coupling sleeve (7) is slidably fitted in the axial direction, and a spoke ring is inserted between the transmission gears (2) and (3) and the coupling sleeve (7). (10)(1
1), and the sliding of the coupling sleeve (7) pushes the poke rings (10) and (11), and the conical surfaces of the poke rings (10 and 11) align with the conical surfaces of the transmission gears (2 and 3). contact so that a synchronizing action takes place. Make the surface hardness of the rolling surface of the rollers of roller bearings (4) and (5) HRC62 or higher.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a synchronous meshing device for a transmission of a vehicle or the like.

0002

[Prior art and problems with the invention]

FIG. 1 shows an example of a synchronous meshing device for a vehicle transmission.

0003 In Figure 1, (1) is the shaft (main shaft), (2) and (3) are the shaft (1) Forward speed change gear and reverse speed change gear, each rotatably supported via roller bearings (4) and (5) The car (6) is a synchro hub fixed to the shaft (1) with splines. synchro hub A coupling sleeve (7) is fitted around the outer circumference of (6) with a spline so that it can freely slide in the axial direction. It is. In addition, several notches are formed on the outer circumference of the synchro hub (6), and these An insert key (8) is fitted in each. Key (8) Spring (spread) spring) (9) pushes radially outward into the coupling sleeve (7). It is pushed into the groove in the center of the circumference in the width direction. Coupling sleeve (7) and two changes Poke rings (10) and (11) are provided between the speed gears (2) and (3), respectively. forward On the inner periphery of the poke ring (10) on the side of the forward speed change gear (2), there is a ring that is integrated with the forward speed change gear (2). The conical surface facing the conical surface formed on the side of the clutch gear (12) is the reverse gear tooth. On the inner circumference of the poke ring (11) on the car (3) side, there is a clutch integrated with the reverse gear (3). A conical surface is formed facing the conical surface formed on the side of the gear (13). . Then insert the insert into the notches formed on the sides of the poke rings (10) and (11). The key (8) is stuck.

0004 As shown in Figure 1, when the coupling sleeve (7) is in the neutral position, there are two The speed gears (2) and (3) are separated from the shaft (1) and can rotate freely.

[0005] The coupling sleeve (7) is connected to the forward gear by a shift fork (not shown). (2) When moved to the side, the insert key (8) is coupled by the spring (9). The end face of the insert key (8) touches the poke ring (10). When pushed, the conical surface of the poke ring (10) comes into contact with the conical surface of the forward gear (2). Then, the coupling sleeve (7) and the forward speed change gear (2) are connected by a well-known synchronous action. The coupling sleeve (7) presses the insert key (8) when the Lower it to engage with the spline on the outer circumference of the poke ring (10) and clutch gear (12). . As a result, the forward speed change gear (2) is connected to the shaft (1), and the synchronizer gear is connected to the shaft (1). Power is transmitted to the forward gear (2) in this order through the sleeve (6) and the coupling sleeve (7). Become so.

[0006] The coupling sleeve (7) is moved to the reverse gear (3) by the shift fork. Similarly, when the reverse gear (3) is moved, the synchro hub (6) and the cup It is connected to the shaft (1) via the ring sleeve (7).

[0007] Conventionally, in the above-mentioned synchronous meshing device, the rollers of the roller bearings (4) and (5) were normally tempered. Bearing steel (JIS SUJ2) that has been hardened and tempered is used. For this reason, The following problems have arisen:

[0008] In a synchronous meshing device, the speed change gears (2) and (3) are separated from the shaft (1) and attached to the shaft (1). During idle rotation, when the roller bearings (4) and (5) rotate freely, the rollers of the roller bearings (4) and (5) also rotate. Almost no load acts on it. On the other hand, the transmission gears (2) and (3) are connected to the shaft (1). During synchronous rotation when the roller bearings (4) and (5) rotate together with the shaft (1), the roller bearings (4) and (5) Although the rollers hardly rotate, the full load is applied to them. Therefore, normal use It is rare for rollers to peel off due to fatigue of the material, as in the case of synchronous rotation. During rolling, slight wear may occur on the rollers, or the very surface of the rollers may be damaged due to the inability to form an oil film. Surface wear with cracks occurs on the surface. The surface roughness of gears (2) (3) and shaft (1) is rough. In such cases, such wear becomes particularly noticeable. And if the rollers wear out, , the radial clearance increases, the gears tilt, and in the worst case, power transmission becomes impossible. Become.

[0009] The purpose of this invention is to solve the above problems and reduce wear of the rollers of roller bearings during synchronous rotation. The object of the present invention is to provide a synchronous meshing device for a small transmission.

0010

[Means to solve the problem]

The synchronized meshing device of the transmission based on this invention is A speed change gear is rotatably supported around the shaft via a roller bearing, and a coupling The coupling sleeve is slidably fitted in the axial direction, and the transmission gear and the coupling sleeve are connected to each other. A poke ring is provided between the holes, and the port is opened by sliding the coupling sleeve. The ring is pushed and the conical surface of the poke ring contacts the conical surface of the transmission gear, causing synchronous operation. In the synchronizing mesh device of a transmission, which is designed to perform the following functions, The depth from the rolling surface of the rollers of the above roller bearing, that is, the outermost surface, is at least The surface hardness of the 0.1 mm surface area is HRC62 or higher. Ru.

[0011] There are several ways to increase the surface hardness of the rolling surface of the roller to HRC62 or higher. For example, as described in Japanese Patent Application Laid-Open No. 60-92463, high carbon steel such as bearing steel Treatments such as carbonitriding or nitriding are applied to the rolling surface of rollers made of raw steel materials. At the same time, the surface matrix is made to have high carbon and nitrogen content from the inside. A method of tempering in the range of 200 to 250℃ after quenching. Afterwards, there are methods such as sub-zero treatment and tempering in the range of 150 to 200℃. be.

0012

[Effects of action and invention]

Since the surface hardness of the rolling surface of the roller bearing is HRC62 or higher, this Filter wear is reduced. By reducing roller wear, wear particles are drastically reduced. Wear of the shaft corresponding to the inner ring and the transmission gear corresponding to the outer ring is also reduced.

[0013]

【Example】

Next, an example of this invention will be illustrated in order to demonstrate the above effects.

[0014] The rolling surface of a roller made of bearing steel (JIS SUJ2) was heated to approximately 870°C for several hours. After carbonitriding and quenching, tempering at approximately 210°C (Example) ) and the rolling surface of the same bearing steel rollers is normally quenched at approximately 180°C. (comparative example) was prepared.

[0015] The relationship between the depth from the surface of the rolling surface and the hardness was measured for the examples and comparative examples. The determined results are shown in Figure 2.

[0016] In Figure 2, in the comparative example, the hardness is below HRC62 from the surface to a certain depth. In the example, the hardness in a relatively deep part is smaller than in the comparative example. However, the surface hardness was HRC63-64, which is higher than that of the comparative example.

[0017] Next, the rollers of the example and comparative example were installed in an actual machine as shown in Figure 1, and the rollers were tested under the same conditions and at the same time. After running for a while, the amount of wear on the rollers, shaft, and outer ring (speed change gear) was measured. In addition The material and heat treatment of the shaft and outer ring are the same in the example and the comparative example. The result The results are shown in Figure 3.

[0018] In Figure 3, the rollers using the example rollers are the ones using the rollers of the comparative example. Compared to the previous model, the amount of wear on the rollers, shaft, and outer ring was significantly reduced. This is Koro Due to the high surface hardness of the rollers, wear on the rollers is reduced, which dramatically reduces wear particles. This is thought to be due to the fact that the wear of the shaft and outer ring is also reduced.

[0019]

[Effect of the idea]

According to the synchronous meshing device of the transmission of this invention, as mentioned above, the rollers during synchronous rotation As a result, the amount of wear on the shaft and transmission gear is also reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a synchronizing mesh device for a transmission.

FIG. 2 is a graph showing the relationship between the depth from the surface of the rolling surface portion of the rollers of the example and the comparative example and the hardness.

FIG. 3 is a graph showing the measurement results of the amount of wear after actual machine tests of Examples and Comparative Examples.

[Explanation of symbols]

(1) Axis (2)(3) Speed gear (4)(5) Roller bearings (7) Coupling sleeve (10)(11) Pork ring

Claims (1)

[Scope of utility model registration request] Claim 1: A speed change gear is rotatably supported around a shaft via a roller bearing, a coupling sleeve is slidably fitted in the axial direction, and a poke ring is provided between the speed change gear and the coupling sleeve. In a synchronized meshing device for a transmission, the poke ring is pushed by the sliding of the coupling sleeve, and the conical surface of the poke ring contacts the conical surface on the transmission gear side to perform a synchronizing action. A synchronous meshing device for a transmission, characterized in that the rolling surface of the rollers of the roller bearing has a surface hardness of HRC62 or higher.