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Parking braking pawl of automatic gearbox

An automatic transmission and pawl technology, applied in the fields of pawl, automatic transmission parking brake, and automatic transmission parking brake pawl, can solve problems such as pawl breakage, achieve high safety factor, reduce fracture risk, The effect of reducing wear

Inactive Publication Date: 2014-04-02
SHENGRUI TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the process of realizing the present invention, the inventors have found that there are at least the following problems in the prior art. Because the front part of the pawl is milled out, there is a risk of the pawl breaking under abnormal parking conditions, such as figure 2 As shown, the force analysis found that in the counterweight area, the stress on the pawl is 600-900MPa

Method used

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  • Parking braking pawl of automatic gearbox
  • Parking braking pawl of automatic gearbox
  • Parking braking pawl of automatic gearbox

Examples

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Embodiment 1

[0023] Example 1, such as image 3 and Figure 4 As shown, a parking brake pawl for an automatic transmission includes a pawl head 1, a pawl body 2 and a pawl tail 3, a pin hole 4 is provided on the pawl, and a pawl body 2 at the front end of the pin hole 4 A cavity 5 is provided. In order to reduce the fracture risk of the ratchet, a reinforcing rib 6 is provided in the middle of the cavity 5. The thickness of the reinforcing rib 6 is 2.54 mm. A torsion spring mounting hole 7 runs through the reinforcing rib 6. The torsion spring installation hole 7 is used for installing a torsion spring, and the center of gravity of the pawl is located at the rear end of the pin hole 4 .

[0024] like Figure 5 As shown, under the same force, the stress of the ratchet head is basically the same as that of the prior art, but in the counterweight region, the stress of the ratchet is lower than 250MPa, and the safety factor High, not easy to break.

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Abstract

The invention relates to a parking braking pawl of an automatic gearbox. The parking braking pawl of the automatic gearbox comprises a pawl head, a pawl body and a pawl tail, wherein pin hole is formed in the pawl, the pawl body is provided with a cavity in front of the pin hole, a reinforcing rib is arranged at the middle part of the cavity, a torsion spring mounting hole is formed in the reinforcing rib in a penetrating manner, and the gravity center of the pawl is positioned behind the pin hole so as to reduce the attrition; the reinforcing rib is 2.54mm thick, and stress applied to the balancing area of the pawl is small, so that the security coefficient is high, and the breaking risk of the pawl is reduced.

Description

technical field [0001] The invention relates to a pawl suitable for an automatic transmission, in particular to a parking brake pawl for an automatic transmission and belongs to the technical field of parking brakes for an automatic transmission. Background technique [0002] In a multi-speed automatic transmission, a parking brake system is required to prevent the gears in the gearbox from rotating when parking, thereby preventing the vehicle from slipping. [0003] At present, the parking brake system adopts a ratchet pawl structure. The pawl includes a pawl head, a pawl tail and a pawl body. There are two punching holes. After the durability test, it was found that the front end of the pawl head and the contact surface of the ratchet wheel were obviously worn. After analysis, it was found that the center of gravity of the pawl was located at the front of the pawl, that is, the center of gravity of the pawl was located between the pin hole and the pawl head. During the pe...

Claims

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Application Information

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IPC IPC(8): F16H63/34F16H63/38
CPCF16H63/3433
Inventor 刘祥伍姜建辉魏文书李三帅
Owner SHENGRUI TRANSMISSION
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