CN112555406A

CN112555406A - Parking braking mechanism

Info

Publication number: CN112555406A
Application number: CN202011422483.6A
Authority: CN
Inventors: 谭文聘
Original assignee: Pangeo Hunan Industrial Co ltd
Current assignee: Pangeo Technology Co ltd
Priority date: 2020-12-08
Filing date: 2020-12-08
Publication date: 2021-03-26
Anticipated expiration: 2040-12-08
Also published as: CN112555406B

Abstract

A parking braking mechanism comprises a pawl, a cam, a parking motor and a supporting device; the support device is rotatably provided with a pawl and a driving shaft; one end of the cam is connected with the driving shaft, and the other end of the cam is abutted to the pawl; a connecting sleeve is arranged between a motor control shaft and a driving shaft of the parking motor, a waist-shaped hole is formed in the upper end of the connecting sleeve, a gap is formed in the lower end of the connecting sleeve, the connecting sleeve is connected to the motor control shaft through a first pin shaft, a pressure spring is further arranged between the motor control shaft and the upper end of the connecting sleeve, the lower end of the connecting sleeve is sleeved at the upper end of the driving shaft through the pressure spring, and a second pin shaft is located in the gap; the connecting sleeve is characterized in that a second torsion spring is arranged on the outer side of the connecting sleeve, the upper end of the second torsion spring is connected with the first pin shaft, the lower end of the second torsion spring is connected with the second pin shaft, the bottom end of the connecting sleeve is connected with the unlocking plate, and the connecting sleeve moves along the axial direction when the unlocking plate rotates. The invention can solve the problem that the parking brake cannot be performed when the parking motor fails, and improves the safety performance.

Description

Parking braking mechanism

Technical Field

The invention belongs to the field of automobile automatic transmissions in the automobile manufacturing industry, and particularly relates to a parking brake mechanism for an automatic transmission or a new energy electric drive system.

Technical Field

With the rapid development of automobile technology and the rapid increase of automobile holding capacity, vehicles matched with automatic transmissions are increasingly popular due to the fact that driving methods of the vehicles are simple, convenient and practical. The current automobile industry also develops towards the direction of energy conservation, environmental protection, safety and comfort, and under the strong support of the country, a new energy vehicle is showing a rapid development trend, and a new energy electric driving system replaces a traditional engine and a traditional speed changer to be used as a new energy vehicle power input system. In order to prevent the automobile from sliding when the automobile is parked, the automatic gearbox and the new energy electric drive system are provided with a parking brake mechanism to lock the automobile.

The parking brake mechanism is used as a key safety device of the transmission, provides guarantee for the safety of the transmission, and is an indispensable key mechanism in an automatic transmission or a new energy electric drive system. As shown in fig. 1, a conventional parking brake mechanism drives a cam to move through a push rod assembly, so that the cam pushes a pawl to be inserted into a parking gear to park. However, when the parking motor fails, no emergency measures are taken to realize parking, so that potential safety hazards are easily caused. In addition, the traditional parking brake mechanism has too many parts arranged on the gearbox body, so that the gearbox is difficult to process and inconvenient to assemble, and the production efficiency is influenced.

Disclosure of Invention

The invention aims to provide a parking brake mechanism to solve the problem that a traditional parking mechanism cannot park when a parking motor fails.

In order to achieve the purpose, the invention adopts the technical scheme that: a parking brake mechanism comprises a pawl, a cam and a parking motor, wherein the cam can enable the pawl to be inserted into or separated from a parking gear when moving; the transmission device also comprises a supporting device used for being connected with the gearbox, and a pawl and a driving shaft are rotatably arranged on the supporting device; one end of the cam is connected with the driving shaft, and the other end of the cam is abutted against the pawl and drives the cam to move when the driving shaft rotates; a connecting sleeve is arranged between a motor control shaft and a driving shaft of the parking motor, a kidney-shaped hole is formed in the upper end of the connecting sleeve, a gap is formed in the lower end of the connecting sleeve, a first pin shaft penetrates through the kidney-shaped hole to connect the connecting sleeve to the motor control shaft, a pressure spring is further arranged between the motor control shaft and the upper end of the connecting sleeve, the lower end of the connecting sleeve is sleeved at the upper end of the driving shaft through the pressure spring, and a second pin shaft on the driving shaft is located in the gap; the outside of adapter sleeve is equipped with the second torsional spring, the upper end and the first round pin hub connection of second torsional spring, and its lower extreme and second round pin hub connection, the bottom and the rotatable unlocking plate of adapter sleeve are connected, and when the unlocking plate is rotatory the adapter sleeve is along axial displacement.

When car ECU sends command signal for the parking motor, parking motor inefficacy irrotational under certain response time, car ECU can send command signal again this moment and promote the unblock board rotatory, the unblock board rotation can promote the adapter sleeve upwards to slide and break away from the drive shaft to remove the connection between motor control shaft and the drive shaft, the connection is relieved the back, the second torsional spring can promote the drive shaft rotatory, the drive shaft rotation promotes the cam rotation, the cam rotation can promote the pawl rotation, make the tooth portion of pawl insert the parking gear, accomplish urgent parking. After the parking motor fault is removed, the P-gear operation is carried out, the automobile ECU sends an instruction signal to the parking motor, the parking motor rotates, the parking motor can drive the connecting sleeve to rotate, the rotating connecting sleeve slides downwards under the action of the pressure spring, and the sliding connecting sleeve can be coupled with the connection between the motor control shaft and the driving shaft again, so that the resetting of the emergency parking function is realized.

Preferably, one end of the unlocking plate, which is far away from the connecting sleeve, is rotatably arranged on the supporting device, the end of the unlocking plate is connected with the electromagnet, and the unlocking plate rotates when the electromagnet is electrified.

The automobile ECU can send a command signal to the electromagnet, the electromagnet drives the unlocking plate to do circular arc swing, and then the connecting sleeve is driven to move along the axial direction, so that the motor control shaft is separated from the driving shaft.

Preferably, a roller is fixed to one end, in contact with the cam, of the pawl through a third pin shaft, and the cam abuts against the roller. The arrangement of the roller enables the contact between the cam and the pawl to be changed from sliding friction to rolling friction, and the cam is favorable for pushing the pawl to rotate.

Preferably, the drive shaft outside is equipped with first torsional spring, cam and sector plate from top to bottom in proper order, first torsional spring and sector plate are fixed in the drive shaft, and the sector plate is connected with the first end of first torsional spring, the second end and the cam connection of first torsional spring, still be fixed with the cam drive axle on the sector plate, and the free end of cam be located between the first end of cam drive axle and first torsional spring and with the pawl butt.

Preferably, strutting arrangement includes fixed connection's last backup pad and bottom suspension fagging, pawl, cam, sector plate and first torsional spring all are located between backup pad and the bottom suspension fagging, the drive shaft rotates with last backup pad and bottom suspension fagging to be connected.

Because the pawl, the cam, the sector plate, the driving shaft and the like are integrated on the supporting device, compared with the mode that each part is independently arranged on the gearbox, the structure is simpler to process and is easier to assemble.

Preferably, a position between the cam and the upper supporting plate outside the driving shaft is provided with a limiting sleeve to prevent the cam from moving up and down during rotation.

Preferably, an arc-shaped hole is formed in the supporting device, and the lower end of the cam driving shaft penetrates through the sector plate and can move along the arc-shaped hole. The angle of motor actuation may be determined by the position of the cam drive shaft in the arcuate aperture at the beginning of installation.

Preferably, the pawl is provided with a magnet, and the support device is fixed with a hall sensor. The position of the pawl can be judged by the induction of the Hall sensor to the magnet.

The invention has the beneficial effects that: the emergency parking device formed by combining the connecting sleeves and the like is integrated to solve the problem that the parking brake cannot be carried out when the parking motor fails, so that double insurance is provided for safety; meanwhile, the problems that the traditional parking mechanism is provided with too many mounting parts on the box body and the box body is difficult to process are effectively solved, and the production efficiency and the reliability of the assembly process are improved.

Drawings

FIG. 1 is a schematic view of a prior art parking mechanism mounted on a housing;

FIG. 2 is a schematic view of the present invention mounted on a cabinet;

FIG. 3 is a schematic view of the installation of the present invention on a tank with the adapter sleeve removed;

FIG. 4 is a schematic view of the present invention in an out-of-park condition with the upper support plate removed;

FIG. 5 is a schematic view of the present invention in a park condition with the upper support plate removed;

FIG. 6 is a bottom view of the present invention;

FIG. 7 is a view of the mounting interface of the present invention on a transmission;

fig. 8 is a schematic view of the connecting sleeve of the present invention.

Detailed Description

The invention is further illustrated by the following figures and examples.

A parking brake mechanism, as shown in figures 1-8, comprises a pawl 21, a cam 30, a parking motor 29 and a support device C connected with a gear box 31, wherein the cam 30 can make the pawl 21 be inserted into or separated from a parking gear 26 when moving. The supporting device C comprises a lower supporting plate 1 and an upper supporting plate 2, two support legs of the upper supporting plate 2 are bent to extend into the lower supporting plate 1 and are riveted with the lower supporting plate 1, and the other support legs are connected through a pawl mounting shaft 22 to enable the upper supporting plate and the lower supporting plate to form a whole. The pawls 21 are rotatably mounted on the support means C by pawl mounting shafts 22. The support device C is fixedly connected with the gear box 31 through the bolt mounting shaft 20.

The driving shaft 5 is rotatably connected with the upper supporting plate 2 and the lower supporting plate 1. The motor control shaft 4 of the parking motor 29 is connected with the driving shaft 5, the driving shaft 5 is fixed with a sector plate 15 and a first torsion spring 16, one end of the sector plate 15 is connected with one end of the first torsion spring 16, the other end of the sector plate 15 is also fixed with a cam driving shaft 25, the other end of the first torsion spring 16 is connected with one end of a cam 30, the end of the cam 30 is located between the two ends of the sector plate 15 (namely, between one end of the first torsion spring 16 and the cam driving shaft 25), and the other end of the cam 30 is sleeved on the driving shaft 5.

In this embodiment, the pawl 21, the cam 30, the sector plate 15 and the first torsion spring 16 are all located between the upper support plate 2 and the lower support plate 1, and the other end of the driving shaft 5 passes through the upper support plate 2 and is connected with the motor control shaft 4. The installation mode has simple machining requirement on the box body, is easy to install and occupies small space.

In this embodiment, a connection sleeve 6 is further provided between the motor control shaft 4 and the driving shaft 5, the lower end of the motor control shaft 4 is pressed into the first pin 8A, and the upper end of the driving shaft 5 is pressed into the second pin 8B. The upper end and the lower end of the connecting sleeve 6 are respectively provided with a waist-shaped hole and an L-shaped gap, the waist-shaped hole is matched with a first pin shaft 8A on the motor control shaft, the L-shaped gap is matched with a second pin shaft 8B on the driving shaft 5, and the connecting sleeve is pressed by a pressure spring 7, so that the motor control shaft 4 and the driving shaft 5 are in a connecting state. The connecting sleeve 6 is provided with a second torsion spring 9, and two arms of the second torsion spring 9 are respectively connected with the first pin shaft 8A and the second pin shaft 8B. The unlocking plate 10 is riveted on the upper supporting plate 2 and can freely rotate, one side of the unlocking plate 10 is connected with the electromagnet 11, the other side of the unlocking plate is connected with the connecting sleeve 6, when the electromagnet 11 is electrified to work, the unlocking plate 10 can rotate around the rivet to push the connecting sleeve 6 to do axial linear motion, the driving shaft 5 is separated from the connecting sleeve 6, the driving shaft 5 does rotary motion under the action of the torsion spring, and the cam 30 rotates under the action of the second torsion spring 9 to push the pawl 21 to rotate, so that emergency parking is realized. When resetting, the parking motor 29 rotates to the parking position to drive the motor control shaft 4 to rotate, the motor control shaft 4 rotates to drive the connecting sleeve 6 to rotate to the parking position, the pressure spring 7 on the connecting sleeve 6 pushes the connecting sleeve 6 to move along the axial direction, and the second pin shaft 8B of the driving shaft 5 is clamped into the L-shaped notch of the connecting sleeve 6, so that resetting is realized.

A roller 27 is fixed to one end of the pawl 21 that contacts the cam 30 via a third pin 28, and the cam 30 abuts against the roller 27 when rotating. A return torsion spring 23 is arranged on the pawl mounting shaft 22, and one end of the return torsion spring 23 is abutted against one side of the pawl 21 close to the parking gear 26 and used for resetting the pawl 21.

In this embodiment, the pawl 21 is provided with a magnet 24, and the upper support plate 2 is fixed with the hall sensor 3. A leaf spring 12 is further fixed to the supporting means C, one end of the leaf spring 12 is riveted to the leg of the upper supporting plate 2 inserted into the lower supporting plate 1 by a rivet 19, and the other end is connected to a leaf spring roller 13 mounted by a fourth pin 14 for preventing the sector plate 15 from being out of gear due to over-rotation.

In this embodiment, a sleeve 18 is fitted around the outside of the drive shaft 5, and a stopper 17 is provided at a position between the cam 30 and the upper support plate 2 outside the drive shaft 5 to prevent the cam 30 from moving up and down. An arc-shaped hole 2A is formed in the lower supporting plate 1, and the cam driving shaft 25 can move along the arc-shaped hole 2A. Can be used for the parking motor 29 to self-learn the rotation position.

The working process of the invention is as follows: when the automobile is operated in the P gear, the automobile ECU sends a command signal to the parking motor 29, the parking motor 29 rotates, the motor control shaft 4 rotates, the driving shaft 5 rotates under the action of the connecting sleeve 6, the sector plate 15 rotates due to the fact that the sector plate 15 is connected with the driving shaft 5, the sector plate 15 rotates and pushes the first torsion spring 16, the first torsion spring 16 pushes the cam 30 to rotate, the cam 30 rotates and pushes the pawl 21 to swing around the pawl mounting shaft 22, the tooth portion of the pawl 21 can be clamped into the parking gear 26 due to the swing, and therefore the parking action is completed. During gear releasing operation, the sector plate 15 rotates, the cam driving shaft 25 is fixedly connected with the sector plate 15 and rotates together with the sector plate 15, the rotating cam driving shaft 25 pushes the cam 30 to rotate, the return torsion spring 23 on the pawl 21 pushes the pawl 21 to rotate after the cam 30 rotates, the tooth part of the pawl 21 is separated from the parking gear 26, and therefore the parking releasing operation is completed, and the automobile releases the P gear. When the automobile ECU sends an instruction signal to the parking motor 29, the parking motor 29 does not rotate within a certain response time, the automobile ECU sends the instruction signal to the electromagnet 11 again, the electromagnet 11 can do linear motion to push the unlocking plate 10 to rotate, the unlocking plate 10 can push the connecting sleeve 6 to slide on the shaft in a rotating mode, the sliding connecting sleeve 6 can release the connection between the motor control shaft 4 and the driving shaft 5, after the connection is released, the second torsion spring 9 can push the driving shaft 5 to rotate, the driving shaft 5 can move according to the parking flow in a rotating mode, and parking is completed. After the fault of the parking motor 29 is removed, the P-gear operation is performed, the automobile ECU sends an instruction signal to the parking motor 29, the parking motor 29 rotates, the parking motor 29 drives the connecting sleeve 6 to rotate, the rotating connecting sleeve 6 slides on the shaft under the action of the pressure spring 7, the sliding connecting sleeve 6 can be coupled with the connection between the motor control shaft 4 and the driving shaft 5 again, and therefore the resetting of the emergency parking function is achieved.

Claims

1. A parking brake mechanism comprises a pawl (21), a cam (30) and a parking motor (29), wherein the cam (30) can enable the pawl (21) to be inserted into or separated from a parking gear (26) when moving; the transmission is characterized by further comprising a supporting device (C) connected with the gearbox (31), wherein the supporting device (C) is rotatably provided with a pawl (21) and a driving shaft (5); one end of the cam (30) is connected with the driving shaft (5), and the other end of the cam (30) is abutted with the pawl (21) and drives the cam (30) to move when the driving shaft (5) rotates; a connecting sleeve (6) is arranged between a motor control shaft (4) and a driving shaft (5) of the parking motor (29), a waist-shaped hole is formed in the upper end of the connecting sleeve (6), a gap is formed in the lower end of the connecting sleeve (6), a first pin shaft (8A) penetrates through the waist-shaped hole to connect the connecting sleeve (6) to the motor control shaft (4), a pressure spring (7) is further arranged between the motor control shaft (4) and the upper end of the connecting sleeve (6), the lower end of the connecting sleeve (6) is sleeved at the upper end of the driving shaft (5) through the pressure spring (7), and a second pin shaft (8B) on the driving shaft (5) is located in the gap; the outside of adapter sleeve (6) is equipped with second torsional spring (9), the upper end and the first round pin axle (8A) of second torsional spring (9) are connected, and its lower extreme is connected with second round pin axle (8B), the bottom and the rotatable unlocking plate (10) of adapter sleeve (6) are connected, and when unlocking plate (10) are rotatory adapter sleeve (6) are along axial displacement.

2. A parking brake mechanism according to claim 1, characterized in that the end of the unlocking plate (10) remote from the connecting sleeve (6) is rotatably mounted on the support means (C) and that the end of the unlocking plate (10) is connected to the electromagnet (11), the unlocking plate (10) being rotated when the electromagnet (11) is energized.

3. A parking brake mechanism according to claim 1, wherein a roller (27) is fixed to an end of the pawl (21) in contact with the cam (30) via a third pin (28), the cam (30) abutting against the roller (27).

4. The parking brake mechanism according to claim 1, wherein a first torsion spring (16), a cam (30) and a sector plate (15) are sequentially sleeved on the outer side of the driving shaft (5) from top to bottom, the first torsion spring (16) and the sector plate (15) are fixed on the driving shaft (5), the sector plate (15) is connected with a first end of the first torsion spring (16), a second end of the first torsion spring (16) is connected with the cam (30), a cam driving shaft (25) is further fixed on the sector plate (15), and a free end of the cam (30) is located between the cam driving shaft (25) and the first end of the first torsion spring (16) and abutted to the pawl (21).

5. A parking brake mechanism according to claim 4, characterized in that said support means (C) comprises an upper support plate (2) and a lower support plate (1) fixedly connected, said pawl (21), cam (30), sector plate (15) and first torsion spring (16) being located between the upper support plate (2) and the lower support plate (1), said drive shaft (5) being rotatably connected to the upper support plate (2) and the lower support plate (1).

6. A parking brake mechanism according to claim 5, characterized in that a stop collar (17) is provided on the outside of the drive shaft (5) between the cam (30) and the upper support plate (2).

7. A parking brake mechanism according to claim 4, wherein said support means (C) is provided with an arc-shaped hole (2A), and the lower end of said cam actuating shaft (25) penetrates through the sector plate (15) and is movable along the arc-shaped hole (2A).

8. Parking brake mechanism according to claim 1, characterized in that a magnet (24) is mounted on said pawl (21) and a hall sensor (3) is fixed on said support means (C).