CN203297314U - A kind of automobile transmission input shaft - Google Patents

Abstract

The utility model provides an automotive transmission input shaft belongs to automobile parts technical field. The transmission input shaft solves the problem that an existing transmission input shaft lacks an effective heat dissipation structure, so that the input shaft is in a high-temperature environment for a long time and short in service life. The input shaft of the automobile transmission comprises a step shaft body, wherein a first step part and a second step part which are connected with a transmission gear are respectively arranged on the step shaft body, the outer diameter of the second step part is larger than that of the first step part, a section of mounting hole is axially arranged at the end part of the free end of the second step part from outside to inside, a section of connecting hole is axially arranged at the bottom of the mounting hole, the central line of the mounting hole is overlapped with that of the connecting hole, and an expanding step is formed between the mounting hole and the connecting hole and the hole diameter of the mounting hole is larger than that of the connecting hole. The utility model discloses simple structure, the inside hollow temperature that can effectively reduce the input shaft of step axle body, mechanical strength is higher, and life is longer.

Description

A kind of automobile transmission input shaft

technical field

The utility model belongs to the technical field of auto parts and relates to an input shaft of an auto transmission.

Background technique

The speed changer is a gear transmission device that can change the transmission ratio of the output shaft and the input shaft by fixing or stepping. It is composed of a transmission mechanism and a speed change mechanism. Taking the five-speed transmission as an example, there are five gears with different numbers of teeth on the output shaft, and the output shaft gears mesh with the gears on the intermediate shaft or the input shaft. The speed transmitted by the clutch rotates, but the output shaft does not rotate because the output shaft gear is idle on the output shaft; when the driver is in gear, the shift fork will push a certain synchronizer to engage with the output shaft gear, among which , The synchronizer is connected to the output shaft through a spline, and when the synchronizer is engaged with the output shaft gear, the power is transmitted to the output shaft to achieve gear shifting.

Since there are high-grade gears and low-grade high-torque gears on the input shaft, the input shaft needs to meet the following requirements: 1. The input shaft gear that is empty on the input shaft needs to have better lubrication with the input shaft, that is to say, the input shaft There should be an oil channel on the top to transport the oil to the contact surface between the input shaft gear and the input shaft; 2. The high-torque gear on the input shaft requires the input shaft to have a certain strength, which requires suitable materials and relatively high torque. Large shaft diameter; 3. The input shaft often rotates at high speed, especially when the car is running at high speed, so the input shaft should have better heat dissipation to prevent the shaft from burning.

The current input shaft of the automobile transmission is generally a stepped shaft, on which the driving gears and synchronizers are set sequentially. However, due to the lack of an effective heat dissipation structure on the stepped shaft, the input shaft is kept in a high temperature environment for a long time work, which will seriously affect the service life of the output shaft.

Contents of the invention

The purpose of the utility model is to solve the above-mentioned problems in the existing technology, and propose a kind of automobile transmission input shaft which can effectively reduce its own temperature in the working process, thereby improving its service life. the

The purpose of this utility model can be achieved through the following technical solutions: an input shaft of an automobile transmission, including a stepped shaft body, and the stepped shaft body is respectively provided with a step part 1 and a step part 2 connected to the transmission gear, and the step part 2 The outer diameter of the step part is larger than the outer diameter of the first step part, and it is characterized in that a section of installation hole is axially opened at the end part of the second free end of the step part from outside to inside, and a section of connecting hole is also opened axially at the bottom of the installation hole. The center line of the installation hole overlaps with the center line of the connection hole, the diameter of the installation hole is larger than the diameter of the connection hole, and a flared step is formed between the installation hole and the connection hole.

In the above-mentioned automobile transmission input shaft, the hole wall of the mounting hole and the hole wall of the connecting hole are straight walls, and the step surface of the above-mentioned flared step is perpendicular to the hole wall of the above-mentioned mounting hole and the hole wall of the above-mentioned connecting hole respectively. .

In the above-mentioned input shaft of the automobile transmission, the outer peripheral wall of the free end of the step part 1 is provided with an external thread, and a spline groove 1 is also provided on the outer peripheral wall of the step part 1, and a spline groove 1 is also provided between the described spline groove 1 and the external thread. There is an abutment ring.

In the above-mentioned input shaft of the automobile transmission, the end of the installation hole of the second step portion is also fixed with a three-lobed arc-shaped baffle, and the three-lobed arc-shaped baffles are evenly distributed along the circumferential direction of the installation hole.

In the above-mentioned input shaft of the automobile transmission, a spline groove 2 is also provided on the outer peripheral wall of the stepped portion 2 .

Compared with the prior art, the input shaft of the automobile transmission is provided with a connection hole in the inner axis of the step part two, and a section of installation hole is axially provided in the end part of the step part two free end from the outside to the inside, and the installation hole is the same as the above-mentioned The connection holes are connected, the center line of the installation hole overlaps with the center line of the connection hole, the diameter of the installation hole is larger than the diameter of the connection hole, and a flare is formed between the installation hole and the connection hole Steps, because the input shaft has connecting holes and installation holes, the hollow inside the step shaft body can effectively reduce the temperature of the input shaft and improve the service life of the input shaft; because the input shaft is integrally formed, the overall mechanical strength of the input shaft is higher . The utility model has simple structure, the hollow inside of the stepped shaft body can effectively reduce the temperature of the input shaft, the utility model has high mechanical strength and long service life.

Description of drawings

Fig. 1 is a sectional structure schematic diagram of the input shaft of the automobile transmission.

In the figure, 1. Step shaft body; 2. Step part 1; 3. Step part 2; 4. Connecting hole; 5. Mounting hole; 6. Flaring step; 7. Spline groove 1; , Three-lobed arc-shaped baffle; 10, Two spline grooves.

Detailed ways

The following are specific embodiments of the utility model and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

As shown in Figure 1, the input shaft of the automobile transmission is mainly composed of a stepped shaft body 1. The stepped shaft body 1 is respectively provided with a stepped portion 1 2 and a stepped portion 2 3 connected to the transmission gear, and the outer diameter of the stepped portion 2 3 is larger than that of the stepped portion. The outer diameter of a 2 is provided with a section of mounting hole 5 axially from outside to inside at the free end of the step part 23, and a section of connecting hole 4 is also provided in the axial direction at the bottom of the mounting hole 5. The centerline of the mounting hole 5 is in line with the The center line of above-mentioned connection hole 4 overlaps, and the hole diameter of installation hole 5 is greater than the hole diameter of above-mentioned connection hole 4 and forms a flaring step 6 between this installation hole 5 and connection hole 4; The hole wall of described installation hole 5 and the hole wall of the connection hole 4 are straight walls, and the step surface of the above-mentioned flared step 6 is respectively perpendicular to the hole wall of the above-mentioned mounting hole 5 and the hole wall of the above-mentioned connection hole 4; The external thread is also provided with a spline groove 7 on the outer peripheral wall of the step part 2, and an abutment ring 8 is also provided between the spline groove 7 and the external thread; the installation hole 5 of the step part 2 3 The end of the orifice is also fixedly provided with a three-lobed arc-shaped baffle 9, and the three-lobed arc-shaped baffles 9 are evenly distributed along the circumferential direction of the installation hole 5; spline grooves are also arranged on the outer peripheral wall of the step part 2 3 Two 10.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Although this article uses more: step shaft body 1; step part one 2; step part two 3; connecting hole 4; mounting hole 5; flared step 6; spline groove one 7; abutment ring 8; Baffle plate 9; spline groove two 10 and other terms, but the possibility of using other terms is not excluded. These terms are only used to describe and explain the essence of the utility model more conveniently; interpreting them as any kind of additional limitation is contrary to the spirit of the utility model.

Claims (5)

1. An input shaft of an automobile transmission, comprising a stepped shaft body (1), the stepped shaft body (1) respectively has a step part one (2) and a step part two (3) connected to the transmission gear, and the step part The outer diameter of the second (3) is larger than the outer diameter of the step part one (2). It is characterized in that a section of installation hole (5) is axially opened on the free end of the step part two (3) from the outside to the inside. In the installation hole (5) A connection hole (4) is opened at the bottom of the hole in the axial direction. The center line of the installation hole (5) overlaps with the center line of the above connection hole (4). The hole of the installation hole (5) The diameter is larger than that of the connection hole (4) and a flared step (6) is formed between the installation hole (5) and the connection hole (4). 2. The automobile transmission input shaft according to claim 1, characterized in that, the hole walls of the mounting hole (5) and the connecting hole (4) are both straight walls, and the steps of the flared steps (6) The planes are respectively perpendicular to the hole wall of the above-mentioned mounting hole (5) and the hole wall of the above-mentioned connecting hole (4). 3. The automobile transmission input shaft according to claim 2, characterized in that, the outer peripheral wall of the free end of the step part one (2) is provided with external threads, and the outer peripheral wall of the step part one (2) is also provided with a spline groove One (7), there is also an abutment ring (8) between the spline groove one (7) and the external thread. 4. The input shaft of the automobile transmission according to claim 2, characterized in that, the end of the installation hole (5) of the second step part (3) is also fixed with a three-lobed arc-shaped baffle (9), so The above-mentioned three-lobed arc-shaped baffles (9) are evenly distributed along the circumferential direction of the installation hole (5). 5 . The input shaft of the automobile transmission according to claim 4 , characterized in that, a second spline groove ( 10 ) is also provided on the outer peripheral wall of the second step portion ( 3 ).