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Parking braking device without parking gear

A brake device, parking gear technology, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve problems such as cost increase, angle limitation, brake gear locking, etc., and achieve savings Low cost, smooth push rod force, and guaranteed braking reliability

Active Publication Date: 2013-09-18
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 free (not pushed or pulled), 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] Embodiment 1: as figure 1 and 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, and a transmission gear 4 in the transmission system is used to replace the function of the parking gear.

[0034] The ratchet mechanism 3 includes an arc-shaped ratchet 31, a ratchet return spring 32 and a ratchet support 33; in order to make the arc-shaped ratchet 31 directly cooperate with the transmission gear 4 (the transmission gear 4 is a part of the differential teeth. The typical teeth are small), so one end of the arc-shaped pawl 31 is set as a toothed head 311 meshing with the differential ring gear. The tooth surface of the toothed head 311 is arc-shaped and the number of teeth is 5. The tooth shape The head 311 is directly radially detachably meshed with the parking transmission gear 4; the other end is hinged on the pawl support 33, and the pawl support 33 is die-cast integrall...

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. All the other are with embodiment 1.

Embodiment 3

[0039] Embodiment 3: In order to make the arc-shaped pawl 31 cooperate directly with the transmission gear 4 (the transmission gear 4 is a part of the differential teeth and is a typical small tooth), so one end of the arc-shaped pawl 31 is set to be in contact with the differential gear. The toothed head 311 engaged with the circle, the tooth surface of the toothed head 311 is arc-shaped and the number of teeth is 3, and the toothed head 311 is directly radially detachable meshed with the transmission gear 4 for parking. All the other are with embodiment 1.

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

[0041] When the shift lever of the speed changer was hung into the P gear, the drag cable on the shift mechanism would pull the hinge 12 to ...

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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, the parking 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 present 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 added gear of automatic transmissions. The function of this gear is to realize the braking when the car is parked. Parking brake is an indispensable device in automatic transmission. [0003] The parking brake device of the automatic transmission must fulfill the following functions: [0004] 1. Realize the function of locking and releasing the parking brake wheel under the push and pull of the shift cable; [0005] 2. When the shift push-pull cable is kept free (not pushed or pulled), the parking brake must be strictly kept loose, and the brake gear cannot be locked under the in...

Claims

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Application Information

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Patent Type & Authority Patents(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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