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Parking braking device without parking gear

A technology of braking device and parking gear, applied in transmission control, components with teeth, belt/chain/gear, etc., can solve problems such as cost increase, locking of braking gear, angle limitation, etc., and achieve saving Cost, the push rod force is smooth and stable, and the effect of ensuring braking reliability

Active Publication Date: 2011-07-13
HUAWEI TEHCHNOLOGIES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. When the shift push-pull cable is kept in a free state (no push or pull), the parking brake must be strictly kept loose, and the brake gear cannot be locked under the influence of normal conditions such as external vibration;
[0007] 4. Since the head of the parking pawl is square and has a certain width, its entry into the parking gear is limited by the angle
[0010] Both the above-mentioned US patent and the above-mentioned patent applied by the applicant require a component "parking gear", which increases the layout space of the transmission to a certain extent, and puts forward higher technical requirements for the installation of the parking brake device , and its cost is correspondingly increased a lot, which is still a ubiquitous unresolved problem in this field

Method used

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  • Parking braking device without parking gear
  • Parking braking device without parking gear
  • Parking braking device without parking gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1: Such as figure 1 with figure 2 As shown, a parking brake device without a parking gear is composed of a push rod mechanism 1, a locking mechanism 2 and a pawl mechanism 3. A transmission gear 4 in the transmission system is used to replace the function of the parking gear.

[0034] The pawl mechanism 3 includes an arc-shaped pawl 31, a pawl return spring 32, and a pawl support 33; in order to make the arc-shaped pawl 31 directly cooperate with the transmission gear 4 (the transmission gear 4 is a part of the differential teeth (Typically small teeth), so one end of the arc-shaped pawl 31 is set as a tooth-shaped head 311 that meshes with the inner ring of the differential gear. The tooth surface of the tooth-shaped head 311 is arc-shaped and the number of teeth is 5. The head 311 directly engages with the transmission gear 4 of the parking in a detachable mesh in the radial direction of the transmission gear 4; the other end is hinged on the pawl support 33, whi...

Embodiment 2

[0038] Embodiment 2: When the locking mechanism 2 is in the self-locking bending position, the included angle between the upper hinge 21 and the lower hinge 22 is 175 degrees. The rest is the same as in Example 1.

Embodiment 3

[0039] Embodiment 3: In order to make the arc-shaped pawl 31 directly cooperate with the transmission gear 4 (the transmission gear 4 is a part of the differential gear teeth, which is a typical small tooth), so one end of the arc-shaped pawl 31 is set to match the differential gear The tooth surface of the toothed head 311 is arc-shaped and the number of teeth is three. The toothed head 311 directly engages with the parking gear 4 in a radially separable manner. The rest is the same as in Example 1.

[0040] In actual use: such as image 3 As shown, when the shift lever of the transmission is not in the P position, the arc-shaped pawl 31 of the parking brake device is in a separated state from the transmission gear 4, and the parking brake device is in a non-working state at this time.

[0041] When the shift lever of the transmission is engaged in the P range, the cable on the shift mechanism pulls the hinge 12 to the right. At this time, two situations may occur: first, the arc...

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Abstract

The invention discloses parking braking device without a parking gear. Through a method of designing one end of an arc-shaped pawl of a bend shape structure into a tooth-shaped head internally meshed with a differential tooth ring, thus the arc-shaped pawl can be matched with the differential tooth ring, namely the tooth-shaped head can be directly separated and meshed in the radial direction with a transmission gear of parking vehicle, a pawl mechanism is directly pushed into the tooth groove of the transmission gear through an articulated connecting rod mechanism of a locking mechanism, theparking braking function is realized, thus a parking gear part of the whole parking braking device is omitted, the cost of the product is saved, and the arrangement space of a speed changer is also saved.

Description

Technical field [0001] The patent of the invention relates to a parking brake device, more specifically a parking brake device without a parking gear in an automobile automatic transmission. Background technique [0002] Automatic transmissions generally have at least four gears: forward gear, neutral gear, reverse gear, and P gear. Compared with manual transmissions, P gear is an additional gear for automatic transmissions. The function of this gear is to achieve braking when the car is parked. The parking brake is an indispensable device in the automatic transmission. [0003] The parking brake device of the automatic transmission must fulfill the following functions: [0004] 1. The function of locking and releasing the parking brake wheel is realized under the push and pull of the shift cable; [0005] 2. When the shifting push-pull cable is kept in a free state (not pushed or pulled), the parking brake must be strictly kept in a loose state, and the brake gear cannot be locked ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H63/34
Inventor 邓方敏陈勇尹宏声窦红印李书福杨健赵福全
Owner HUAWEI TEHCHNOLOGIES CO LTD
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