KR19990019143U - Parking brake system of automatic transmission - Google Patents

Abstract

The present invention relates to a parking brake device of an automatic transmission, and when the shifting stage of the automatic transmission is shifted to the parking range, an auxiliary locking member provided separately from the parking sprocket engaged with the annular gear is simultaneously engaged with the annular gear. As a result, the object of the present invention is to maintain a stable parking state without slipping even on a slope while improving braking performance.

The present invention for achieving the object of the above-described, the parking sprag (3) which is installed in the lower portion of the annular gear (1) mounted in the automatic transmission to be elastically rotatable via the spring (2), and The parking sprocket 4 which is supported by the suspension 5 in the lower part of the parking sprag 3, and the tip of the parking sprocket 4 are in contact with the lower end of the parking sprag 3; In the parking brake of the automatic transmission comprising a cam (6) is mounted so that, one end of the parking sprocket (4) is in contact with the parking sprocket (3), the other end of the annular gear (1) An auxiliary locking member 7 engaged with the gear teeth is provided so that the auxiliary locking member 7 is engaged with the annular gear 1 together with the parking sprocket 3.

Description

Parking brake system of automatic transmission

The present invention relates to a parking brake device of an automatic transmission. In particular, when the shifting stage of the automatic transmission is shifted to a parking range, an auxiliary locking member provided to the gear teeth formed at the same time as the outer periphery of the annulus gear together with the parking spag. The present invention relates to a parking brake apparatus of an automatic transmission that is capable of maintaining a more stable braking force and maintaining a stable parking state.

In general, a brake device of a vehicle is a device used to maintain a parking state while decelerating or stopping a driving vehicle. In general, a braking device converts kinetic energy of a vehicle into thermal energy using a friction force.

The braking device includes a foot brake mainly used for driving and a parking brake used for parking a car. The stepping foot brake is usually generated by pushing a friction material to a rotating object such as a brake drum or a disc rotor. The braking force is obtained by using the friction force, which is achieved by the driver pressing down on the brake pedal while driving.

In addition, the parking brake is to brake the brake drum mounted on the propulsion shaft or to brake the rear wheel, which is when the driver pulls the operating lever to close the brake shoe to the brake drum of the rear wheel to brake the rear wheel by the friction force generated at this time. .

On the other hand, the brake device in a vehicle equipped with a manual transmission has both the above-described foot brake and parking brake, so that the driver can use it suitably for its purpose.

On the other hand, a vehicle equipped with an automatic transmission has a separate parking brake device in addition to the above-mentioned foot brake and parking brake, and this parking brake is operated when the shift stage is located in the parking range.

That is, the parking brake acting when the shifting stage of the automatic transmission is shifted to the parking range, as shown in FIG. 1, is parked so that the parking spring can be elastically rotated through the spring 12 below the annular gear 11. Lag 13 is installed, the lower part of the parking sprocket 13 is installed so that the parking sprocket 14 is supported by the support 15, the tip of the parking sprocket 14 While the cam 16 is in contact with the lower end of the parking sprag 13, the parking sprocket 14 is connected to a shift lever (not shown).

Therefore, when the driver puts the shift stage of the automatic transmission into the parking range during parking, the parking sprocket 14 supported in the transmission is pulled by the shaft 15, and accordingly, the parking sprocket ( The cam 16 mounted at the tip of 14 is pushed to rotate the lower end of the parking sprag 13 upward, and the parking sprag 13 is rotated in accordance with the upward rotation of the parking sprag 13. ), The tip end portion is engaged between the gear teeth formed on the outer circumferential surface of the annular gear 11 so that the parking state is maintained.

However, as described above, since the driver puts the shift stage of the automatic transmission into the parking range, the parking state is completely dependent on the parking sprocket 13 engaged with the annular gear 11, so that the cam 16 is pressed. If the parking sprag 13 and the annulus gear 11 are not properly engaged according to the above, especially when the driver puts the shift stage into the parking range on an uphill road, There was a dangerous disadvantage.

The present invention has been devised to solve the above disadvantages, and the auxiliary locking member provided separately from the parking sprocket engaged with the annular gear when the shift stage of the automatic transmission is shifted to the parking range is simultaneously equipped with the annular gear. It is an object of the present invention to provide a parking brake apparatus of an automatic transmission that is capable of maintaining a stable parking state without slipping even on a slope while improving braking performance.

1 is a schematic view showing a parking brake provided in the inside of a conventional automatic transmission,

2 is a schematic view showing a parking brake of an automatic transmission according to the present invention;

3 is an enlarged cross-sectional view of the main portion of FIG. 2.

<Description of Symbols for Main Parts of Drawings>

1-annular gear 2-spring

3-parksprague `4-parksprapol

5-Surf 6-Cam

7-Secondary locking member 7a-first contact

7b-second contact

The present invention for achieving the object of the above, in the parking sprocket that presses the parking sprocket that is engaged with the annular gear of the automatic transmission during parking the gear of the annular gear when parking separately from the parking sprag. By providing an auxiliary locking member to be engaged with the teeth it is possible to improve the braking performance and ensure safety at the same time.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 is a schematic diagram showing a parking brake of the automatic transmission according to the present invention, Figure 3 is an enlarged cross-sectional view showing the main portion of FIG.

The present invention, as shown in the drawings, in order to further improve the braking performance when the shift stage is located in the parking range in a vehicle equipped with an automatic transmission, for this purpose, the present invention is an annular gear ( Parking sprag 3 installed on the lower part of 1) so as to be able to be rotated elastically via a spring 2, and parking sprag installed on the lower part of the parking sprag 3 so as to be supported by a shaft 5; In the parking brake of the automatic transmission comprising a rod (4) and a cam (6) mounted at the distal end of the parking sprocket (4) to be in contact with the lower end of the parking sprig (3), the parking sprocket is Inside the (4), the first contact portion 7a, one end of which is bent to contact the parking sprag 3, and the second contact portion, which is bent toward it so that the other end is engaged with the gear teeth of the annular gear 1; (7b) so that the central part of the parking sprockets (4) The secondary locking member 7 is hinged and rotatably installed in the bar. The auxiliary locking member 7 is engaged with the annular gear 1 together with the parking sprag 3 to improve braking performance. .

That is, when the driver puts the shift stage of the automatic transmission into the parking range during parking, the parking sprockets 4 supported by the shaft 5 in the transmission are pulled, and thus the parking sprockets are pulled. Cam (6) mounted on the tip of the (4) is pushed to rotate the lower end of the parking sprag (3) in the upward direction, the parking sprag ( The front end of 3) is engaged between the gear teeth formed on the outer circumferential surface of the annular gear 1, wherein the first of the auxiliary locking member 7 when the cam 6 is in contact with the lower end of the parking sprag 3. The contact portion 7a is also brought into contact with the parking spur 3 at the same time and descends. As the first contact portion 7a descends, the second contact portion 7b on the opposite side is raised to engage the annular gear 1. Will be.

Therefore, when the parking contact 3 and the second contact portion 7b of the auxiliary locking member 7 are simultaneously engaged with the outer circumferential surface of the annular gear 1 when parking as described above, the annular gear 1 is The clamping force received is further strengthened, so the braking performance is improved.

In addition, when the annular gear 1 in the automatic transmission is fixed by the parking plaque 3 and the auxiliary locking member 7 as described above, the parking safety is ensured even when parking on a slope.

As described above, according to the parking brake apparatus of the automatic transmission according to the present invention, the parking sprocket 3 engaged with the outer circumferential surface of the annular gear 1 in the automatic transmission is parked inside the parking sprocket 4 at the time of parking. By being able to be engaged with the annular gear 1 together with the attached auxiliary locking member 7, not only the braking force for preventing rotation of the annular gear 1 can be greatly improved, but also the safety of parking will be doubled. It can be more effective to maintain a more stable parking state.

Claims (2)

A parking sprag 3 which is installed on the lower portion of the annular gear 1 mounted in the automatic transmission so as to be resiliently rotatable via a spring 2, and a lower part 5 in the lower part of the parking sprag 3; Parking of the automatic transmission consisting of a parking sprocket (4) supported via a) and a cam (6) mounted on the tip of the parking sprocket (4) to be in contact with the lower end of the parking sprocket (3) In the brake, Inside the parking sprocket (4) is provided with an auxiliary locking member (7), one end of which is in contact with the parking sprag (3) and the other end meshes with the gear teeth of the annular gear (1). Auxiliary locking member (7) is a parking brake of the automatic transmission, characterized in that to be engaged with the annular gear (1) together with the parking spur (3). 2. The auxiliary locking member (7) according to claim 1, wherein the auxiliary locking member (7) is integrally extended from the first contact portion (7a) and the first contact portion (7a) bent toward it to contact the parking sprag (3). A parking brake apparatus for an automatic transmission, characterized in that it has a second contact portion (7b) which is in contact with the gear teeth of (1).