Gear and ratchet wheel matching structure applied to electronic mechanical brake
By using the gear and ratchet mating structure of the compression spring device in the electronic mechanical brake, the problem of volatile position of the ratchet is solved, achieving more stable parking function and higher robustness.
Patent Information
- Application Number
- CN202421964538.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-14
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-08-14
AI Technical Summary
In existing electronic mechanical brakes, the ratchet is prone to loss of position, resulting in unstable parking function.
A coordinating structure between gear and ratchet is designed, and a compression spring device is used to replace the traditional interference pressure assembly, which relieves impact through the flexibility of the compression spring and prevents the ratchet from being lost.
It improves the robustness of the parking function, stabilizes the clutch of the ratchet and pawls, avoids obvious noise, and overcomes the poor impact resistance of traditional methods.
Smart Images
Figure CN222991983U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of braking systems, and more specifically, to a matching structure of a gear and a ratchet applied to an electro-mechanical brake. Background Art
[0002] With the rapid development of automotive electrification and intelligence, wire-controlled braking is in the initial stage of industry development. Currently, wire-controlled brake calipers rely on the engagement and disengagement of pawls and ratchets to achieve the clamping and release of the electronic parking function. The original design generally uses interference fit to fix the ratchet on a certain stage in the gear train. When subjected to impact, the ratchet is extremely prone to dislocation, resulting in the unstable realization of the parking function. Summary of the Invention
[0003] In order to overcome the deficiencies of the prior art, the utility model provides a matching structure of a gear and a ratchet applied to an electro-mechanical brake, which overcomes the disadvantage of poor impact resistance caused by traditional interference press-fitting, and makes the robustness of the entire parking realization higher, etc.
[0004] To achieve the above object, a matching structure of a gear and a ratchet applied to an electro-mechanical brake is designed, including a ratchet, a gear, and a gear shaft. The characteristics are as follows: a ratchet is provided on the front side of the gear, and the centers of the gear and the ratchet are axially connected through the gear shaft. A number of rectangular grooves are provided on the gear, and a compression spring and a compression spring support pad are embedded in the rectangular grooves. A bushing is embedded in the central through hole of the ratchet, and a number of retaining edges are provided on the ratchet, and the retaining edges are embedded in the rectangular grooves of the gear. The two ends of the gear shaft are axially connected to a first bearing and a second bearing.
[0005] There are at least 2 rectangular grooves on the gear, and the 2 rectangular grooves are arranged on the left and right sides of the central through hole of the gear.
[0006] The compression spring support pad is in a C-shaped structure, and hook-shaped structures are provided at both ends of the C-shaped structure and are folded outwards.
[0007] The C-shaped structure of the compression spring support pad is embedded in the rectangular groove of the gear, and both ends of the C-shaped structure of the compression spring support pad are stuck on the end face of the gear.
[0008] There are 2 retaining edges on the rear side of the ratchet. One end of the retaining edge is connected to the rear end face of the ratchet, and the other end of the retaining edge is embedded in the rectangular groove of the gear and abuts against one end of the compression spring.
[0009] The bushing and the ratchet are connected by interference fit.
[0010] The bushing is sleeved on the gear shaft, and the bushing and the gear shaft are connected by clearance fit.
[0011] The gear and the gear shaft are connected by interference fit.
[0012] Compared with the prior art, the utility model provides a matching structure of a gear and a ratchet for an electro-mechanical brake, which uses a compression spring device to replace the traditional interference press-fitting to prevent impact displacement, relieves the impact through the flexibility of the compression spring, avoids obvious noise, overcomes the shortcoming of poor impact resistance of the traditional method, and can stably control the engagement and disengagement of the ratchet and the pawl to realize the switching between the parking and driving states, with higher parking robustness. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is an exploded view of the structure of the utility model.
[0014] Figure 2 It is a side view of the structure of the utility model.
[0015] See Figure 1 , Figure 2 , 1 is the first bearing, 2 is the gear shaft, 3 is the second bearing, 4 is the bushing, 5 is the ratchet, 5-1 is the rib, 6 is the compression spring, 7 is the compression spring support pad, 8 is the gear, 8-1 is the rectangular groove, and 9 is the pawl. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0016] The following further describes the utility model with reference to the drawings.
[0017] As Figure 1 , Figure 2 shown, a ratchet 5 is provided on the front side of the gear 8, and the centers of the gear 8 and the ratchet 5 are axially connected by a gear shaft 2. A plurality of rectangular grooves 8-1 are provided on the gear 8, and a compression spring 6 and a compression spring support pad 7 are embedded in the rectangular grooves 8-1; a bushing 4 is embedded in the central through hole of the ratchet 5, and a plurality of ribs 5-1 are provided on the ratchet 5, and the ribs 5-1 are embedded in the rectangular grooves 8-1 of the gear 8; the first bearing 1 and the second bearing 3 are axially connected to both ends of the gear shaft 2.
[0018] There are at least 2 rectangular grooves 8-1 on the gear 8, and the 2 rectangular grooves 8-1 are arranged on the left and right sides of the central through hole of the gear 8.
[0019] The compression spring support pad 7 is in a C-shaped structure, and hook-shaped structures are provided at both ends of the C-shaped structure and are turned outwards.
[0020] The C-shaped structure of the compression spring support pad 7 is embedded in the rectangular groove 8-1 of the gear 8, and both ends of the C-shaped structure of the compression spring support pad 7 are stuck on the end face of the gear 8.
[0021] There are 2 ribs 5-1 on the rear side of the ratchet 5. One end of the rib 5-1 is connected to the rear end face of the ratchet 5, and the other end of the rib 5-1 is embedded in the rectangular groove 8-1 of the gear 8 and abuts against one end of the compression spring 6.
[0022] There is an interference fit connection between the bushing 4 and the ratchet wheel 5.
[0023] The bushing 4 is sleeved on the gear shaft 2, and there is a clearance fit connection between the bushing 4 and the gear shaft 2.
[0024] There is an interference fit connection between the gear 8 and the gear shaft 2.
[0025] As Figure 1 shown, first, the compression spring support pads 7 and 9 are respectively snapped into two rectangular grooves 8-1 on a certain stage gear 8 in the gear train, and then the compression spring 6 is respectively snapped into the rectangular groove 8-1 on the gear 8; the bushing 4 and the ratchet wheel 5 are press-fitted together by interference, and then the two flanges 5-1 on the outside of the ratchet wheel 5 in the assembly of the ratchet wheel 5 and the bushing 4 are also snapped into the rectangular groove 8-1 on the gear 8. The flange 5-1 contacts one end of the compression spring 6, and then the entire assembly is pressed onto the gear shaft 2 equipped with bearings (i.e., the first bearing 1 and the second bearing 3). Among them, there is a clearance fit between the bushing 4 and the gear shaft 2, and an interference fit between the gear 8 and the gear shaft 2, so as to ensure the feasibility of the press-fitting.
[0026] As Figure 2 shown, the ratchet wheel 5 will rotate clockwise in the final stage when the pawl 9 locks. At this time, the right tooth surface of the ratchet teeth of the ratchet wheel 5 will receive an impact force towards the left. In order to ensure that the ratchet wheel 5 does not get out of position, it is necessary to rely on the compression spring 6 in the rectangular groove 8-1 of the gear 8 to transmit it to the gear 8. Since there is an interference fit between the gear 8 and the gear shaft 2, it will be transmitted to the gear shaft 2, and finally transmitted to the housing through the bearings (i.e., the first bearing 1 and the second bearing 3). Compared with the traditional method of the interference connection between the gear 8 and the ratchet wheel 5, this mechanism can relieve the impact through the flexibility of the compression spring 6, avoid obvious noise, overcome the shortcoming of poor impact resistance caused by the traditional interference press-fitting, and make the robustness of the entire parking brake higher.
[0027] The utility model uses a compression spring device to replace the traditional interference press-fitting to prevent impact and displacement, relieves the impact through the flexibility of the compression spring, avoids obvious noise, overcomes the shortcoming of poor impact resistance of the traditional method, can stably control the engagement and disengagement of the ratchet wheel and the pawl to realize the switching between the parking and driving states, and has higher parking robustness.
Claims
1. A gear and ratchet matching structure used in an electronic mechanical brake, comprising a ratchet, a gear, and a gear shaft, characterized in that: A ratchet (5) is provided on the front side of the gear (8); the gear (8) and the ratchet (5) are axially connected at the center through a gear shaft (2); the gear (8) is provided with a plurality of rectangular grooves (8-1), and a compression spring (6) and a compression spring support pad (7) are embedded in the rectangular groove (8-1); a bushing (4) is embedded in the central through hole of the ratchet (5); a plurality of retaining edges (5-1) are provided on the ratchet (5), and the retaining edges (5-1) are embedded in the rectangular groove (8-1) of the gear (8); and a first bearing (1) and a second bearing (3) are axially connected at both ends of the gear shaft (2).
2. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1, characterized in that: At least two rectangular grooves (8-1) are provided on the gear (8), and the two rectangular grooves (8-1) are arranged on the left and right sides of the central through hole of the gear (8).
3. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1, characterized in that: The compression spring support pad (7) is in a C-shaped structure, and outwardly folded hook structures are provided at both ends of the C-shaped structure.
4. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1 or 3, characterized in that: The C-shaped structure of the compression spring support pad (7) is embedded in the rectangular groove (8-1) of the gear (8), and both ends of the C-shaped structure of the compression spring support pad (7) are clamped on the end surface of the gear (8).
5. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1, characterized in that: The rear side of the ratchet (5) is provided with two retaining edges (5-1), one end of the retaining edge (5-1) is connected to the rear end surface of the ratchet (5), and the other end of the retaining edge (5-1) is embedded in the rectangular groove (8-1) of the gear (8) and abuts against one end of the compression spring (6).
6. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1, characterized in that: The bushing (4) and the ratchet (5) are connected by an interference fit.
7. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1, characterized in that: The bushing (4) is sleeved on the gear shaft (2), and the bushing (4) and the gear shaft (2) are connected with each other in a clearance fit.
8. The matching structure of a gear and a ratchet wheel used in an electronic mechanical brake according to claim 1, characterized in that: The gear (8) and the gear shaft (2) are connected by an interference fit.