Driving gear structure of starter isolator

Abstract

The driving gear structure of the starter isolator comprises a driving gear body, an inner ring of the driving gear body is provided with an inner tooth portion, and an outer ring of the driving gear body is provided with an outer tooth portion. An air inlet hole is formed in the front end side of the driving gear body, air outlet holes are formed in the outer ring of the driving gear body, the air outlet holes are distributed in tooth grooves between the adjacent outer tooth parts, and the air inlet hole is communicated with the air outlet holes to form an air guide channel located in the driving gear body. The air inlet hole and the air outlet hole are formed in the driving gear to form the built-in air guide channel, air is automatically guided in for cooling in the rotating process of the driving gear, and the service life of the driving gear is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of isolator driving gears, in particular to a driving gear structure of a starter isolator. Background Art

[0002] The main function of the starter's one-way device is to transmit the driving torque of the electric motor to the engine crankshaft when starting the engine. After the engine is started, the one-way device can automatically slip and cut off the power. Its main power transmission is the meshing of the drive gear of the one-way device with the flywheel. The drive gear moves forward and meshes with the flywheel. After the engine is started, the drive gear moves backward and separates from the flywheel. The forward and backward movement of the drive gear will generate greater friction with the flywheel. Due to space and cost constraints, the starter lacks good cooling protection for this frictional heat generated by the drive gear, which affects the service life of the drive gear. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a driving gear structure of a starter one-way device, by opening an air inlet hole and an air outlet hole on the driving gear to form a built-in air guide channel, air is automatically introduced for cooling during the rotation of the driving gear, thereby increasing the service life of the driving gear.

[0004] Technical solution: To achieve the above-mentioned purpose, the utility model provides a driving gear structure of a starter isolator, comprising a driving gear body, wherein the inner ring of the driving gear body has an inner tooth portion, and the outer ring has an outer tooth portion;

[0005] The front end side of the driving gear body is provided with an air inlet hole, and the outer ring of the driving gear body is provided with an air outlet hole, the air outlet holes are distributed in the tooth grooves between adjacent outer teeth, and the air inlet hole is connected to the air outlet hole to form an air guide channel located in the driving gear body.

[0006] Furthermore, an end groove coaxial with and connected to the inner ring is provided at the front end of the driving gear body, and the air inlet is located on the inner side of the end groove; when the driving gear body is rotating, air is poured into the air guide channel from the air inlet and guided to the air outlet.

[0007] Furthermore, the air inlet hole is in an expanded structure.

[0008] Furthermore, the radial dimension of the air guide channel is larger than the aperture of the air outlet hole.

[0009] Furthermore, the air inlet holes correspond to the air guide channels one by one, a plurality of the air inlet holes are distributed in a circular array along the circumferential contour of the end groove, and a plurality of the air guide channels are distributed in a circular array along the circumferential contour of the driving gear body.

[0010] Furthermore, each tooth groove is distributed with a plurality of air outlet holes, and the plurality of air outlet holes located at the groove bottom of the tooth groove are evenly distributed in a linear array along the axial direction of the driving gear body.

[0011] Furthermore, the groove end of the end groove is chamfered to form an expanded groove, and the air inlet is arranged close to the groove.

[0012] Beneficial effect: The driving gear of the utility model has a built-in air guide channel, and the gas enters the air guide channel from the air inlet hole for diversion and is then discharged from the air outlet hole, thereby forming better air-cooling protection for the driving gear. Since the main contact part of the driving gear is the outer tooth part during the switching process of engagement and separation with the flywheel, the gas discharged from the air outlet hole 5 just enters the tooth groove, realizing air-cooling of the outer tooth part, thereby improving the overall cooling protection effect of the driving gear and extending the service life of the driving gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the overall structural diagram of the driving gear;

[0014] Figure 2 This is a schematic diagram of the structure with the drive gear partially cut away. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings.

[0016] like Figure 1 and Figure 2 As shown, a driving gear structure of a starter isolator comprises a driving gear body 1, wherein the inner ring of the driving gear body 1 has an inner tooth portion 2, and the outer ring has an outer tooth portion 3; the front end side of the driving gear body 1 is provided with an air inlet 4, and the outer ring of the driving gear body 1 is provided with an air outlet 5, wherein the air outlet 5 is distributed in the tooth groove 6 between adjacent outer tooth portions 3, and the air inlet 4 is connected to the air outlet 5 to form an air guide channel 7 located in the driving gear body 1. In the utility model, the driving gear is provided with a built-in air guide channel 7, and the gas enters the air guide channel 7 from the air inlet 4 and is discharged from the air outlet 5 after being guided, thereby forming a better air cooling and temperature reduction protection for the driving gear. Since the main contact part of the driving gear is the outer tooth portion 3 during the switching process of meshing and separation with the flywheel, the gas discharged from the air outlet 5 just enters the tooth groove 6, thereby realizing air cooling and temperature reduction of the outer tooth portion 3, thereby improving the overall cooling and temperature reduction protection effect of the driving gear and extending the service life of the driving gear.

[0017] like Figure 1As shown, the front end of the driving gear body 1 is provided with an end groove 8 which is coaxial with and connected to the inner ring, and the air inlet 4 is located on the inner side of the end groove 8; when the driving gear body 1 is rotating, air is poured into the air guide channel 7 from the air inlet 4 and guided to the air outlet 5, without the need for additional air supply equipment, and the air is guided into the air guide channel 7 by the rotation of the driving gear, thereby saving space and keeping the cost controllable. In addition, in order to make it easier for air to enter the air guide channel 7, the utility model adopts the following two measures:

[0018] First, the air inlet 4 is in an expanded structure, which is specifically obtained by machining and chamfering.

[0019] Second: the groove end of the end groove 8 is chamfered by a machining process to form an expanded groove 80 , and the air inlet 4 is arranged close to the groove 80 .

[0020] Through the above two measures, the air filling capacity of the air inlet hole 4 is improved, so that air can be more easily filled into the air guide channel 7 through the air inlet hole 4, and the air cooling efficiency is further improved.

[0021] In order to ensure that the air guide channel 7 provides sufficient air to the air outlet 5 , in addition to the above two measures, it is also necessary to ensure that: the radial dimension of the air guide channel 7 is larger than the aperture of the air outlet 5 .

[0022] In order to ensure sufficient cooling of the driving gear, the utility model needs to ensure uniform distribution of the air inlet 4, the air guide channel 7 and the air outlet 5. Figure 1 and Figure 2 As shown, the air inlet holes 4 correspond to the air guide channels 7 one by one, and a plurality of the air inlet holes 4 are distributed in a circumferential array along the circumferential contour of the end groove 8, and a plurality of the air guide channels 7 are distributed in a circumferential array along the circumferential contour of the driving gear body 1. Each of the tooth grooves 6 is distributed with a plurality of air outlet holes 5, and a plurality of the air outlet holes 5 located at the bottom of the tooth groove 6 are uniformly distributed in a linear array along the axial direction of the driving gear body 1.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A driving gear structure of a starter isolator, comprising a driving gear body (1), wherein the inner ring of the driving gear body (1) has an inner tooth portion (2), and the outer ring has an outer tooth portion (3); Features: The front end side of the driving gear body (1) is provided with an air inlet hole (4), and the outer ring of the driving gear body (1) is provided with an air outlet hole (5), and the air outlet holes (5) are distributed in the tooth grooves (6) between adjacent external tooth parts (3), and the air inlet hole (4) is connected to the air outlet hole (5) to form an air guide channel (7) located in the driving gear body (1).

2. The driving gear structure of the starter isolator according to claim 1, characterized in that: The front end of the driving gear body (1) is provided with an end groove (8) which is coaxial with and connected to the inner ring, and the air inlet (4) is located on the inner side of the end groove (8); when the driving gear body (1) is in a rotating state, air is poured into the air guide channel (7) from the air inlet (4) and guided to the air outlet (5).

3. The driving gear structure of the starter isolator according to claim 2, characterized in that: The air inlet hole (4) is in an expanded structure.

4. The driving gear structure of the starter isolator according to claim 2, characterized in that: The radial dimension of the air guide channel (7) is greater than the aperture of the air outlet hole (5).

5. The driving gear structure of the starter isolator according to claim 2, characterized in that: The air inlet holes (4) correspond to the air guide channels (7) one by one, a plurality of the air inlet holes (4) are distributed in a circular array along the circumferential contour of the end groove (8), and a plurality of the air guide channels (7) are distributed in a circular array along the circumferential contour of the driving gear body (1).

6. The driving gear structure of the starter isolator according to claim 2, characterized in that: Each tooth groove (6) is distributed with a plurality of air outlet holes (5), and the plurality of air outlet holes (5) located at the groove bottom of the tooth groove (6) are evenly distributed in a linear array along the axial direction of the driving gear body (1).

7. A driving gear structure of a starter isolator according to any one of claims 2 to 6, characterized in that: The groove end of the end groove (8) is chamfered to form an expanded groove (80), and the air inlet (4) is arranged close to the groove (80).

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