Two-wheeled vehicle and front disc rear drum linked valve

Abstract

The application relates to the field of two-wheel vehicle brakes, and provides a front-disc rear-drum linkage valve with the braking characteristic of rear braking first intervention and front braking later intervention. The front-disc rear-drum linkage valve comprises a valve body, a brake cable arranged on the valve body, a lever assembly driven by the brake cable, a hydraulic oil cavity arranged in the valve body, and a pressable piston arranged at the cavity opening of the hydraulic oil cavity. The lever assembly is driven by the brake cable to press the piston, so that hydraulic braking is realized. One end of the brake cable is connected with a rear braking handle, and the other end is connected with a rear drum brake. There is a delay between the two actions of driving the rear drum brake by the brake cable and driving the lever assembly to press the piston. On the basis of the conventional front-disc rear-drum linkage valve, the application increases a regulating valve structure, realizes CBS linkage, improves the universality of the front-disc brake upper pump and the rear braking handle, and reasonably adjusts the front and rear brake braking forces, so that the whole vehicle can be stably braked.

Description

Technical Field

[0001] This application relates to the field of two-wheeled vehicle braking structure technology, and in particular to a two-wheeled vehicle and its front disc and rear drum linkage valve. Background Technology

[0002] Currently, the electric two-wheeler industry conventionally uses a front disc and rear drum system. As the market demand for braking safety increases, CBS linked disc brakes have been gradually developed. The application of the front disc and rear drum CBS structure can reduce the driving skill requirements of riders and achieve smooth braking on dry, wet asphalt roads or slippery gravel roads.

[0003] However, in the commonly used front disc and rear drum brake configurations on the market, the braking force output of the rear drum brake is relatively fixed, and the drum structure has a "self-amplifying" effect, meaning that the friction between the brake shoes and the drum amplifies the braking force. This can cause the actual braking force of the rear wheel to exceed the range that its axle load can withstand. When the rear wheel axle load is significantly reduced due to braking, but the braking force does not decrease simultaneously, it is very easy to exceed the tire's grip limit, causing the problem of wheel lock-up and skidding. Utility Model Content

[0004] This application addresses the shortcomings of existing production technologies by providing a two-wheeled vehicle and its front disc and rear drum linkage valve. Based on the conventional front disc and rear drum linkage valve, an adjusting valve structure is added to achieve CBS linkage, improve the versatility of the front disc brake pump and the rear brake lever, and reasonably adjust the braking force of the front and rear brakes to make the whole vehicle brake smoothly.

[0005] The technical solution adopted in this application is as follows: A front disc / rear drum linkage valve has the braking characteristic of engaging the rear brake first and engaging the front brake later. The front disc and rear drum linkage valve includes a valve body, on which a brake cable and a lever assembly driven by the brake cable are mounted. The valve body is provided with a hydraulic oil chamber, and a pressable piston is installed at the opening of the hydraulic oil chamber; the lever assembly is driven by the brake cable to press the piston, thereby realizing hydraulic braking. One end of the brake cable is connected to the rear brake handle, and the other end is connected to the rear drum brake; there is a delay between the two actions of the brake cable driving the rear drum brake and driving the lever assembly to press the piston.

[0006] As a further improvement to the above technical solution: The lever assembly includes: The first rocker arm is rotatably mounted on the valve body, connected to the brake cable, and driven by the brake cable. The second rocker arm is rotatably mounted on the valve body and is driven by the first rocker arm; the movable end of the second rocker arm presses the piston.

[0007] The gap between the first rocker arm and the second rocker arm is set.

[0008] A spring is coaxially sleeved on the piston, and the spring is initially in contact with the second rocker arm; the spring's restoring force applies a thrust to the second rocker arm.

[0009] The second rocker arm has a boss formed at one end near the piston. The boss extends into the spring and presses the piston as the second rocker arm swings.

[0010] The hinge point of the second rocker arm is located at the midpoint of the second rocker arm.

[0011] The second rocker arm has a hook formed at the end opposite to the piston. The hook is attached to the side of the first rocker arm in the swing direction, and the first rocker arm applies a thrust to the hook.

[0012] The first rocker arm is provided with the cable hole, and the brake cable includes a front brake cable and a rear brake cable, which are respectively installed in the cable hole.

[0013] An opening groove is provided on the side of the cable hole on the first rocker arm to prevent the brake cable from falling off.

[0014] A two-wheeled vehicle equipped with a front disc and rear drum linkage valve as described in any one of the above claims.

[0015] The beneficial effects of this application are as follows: This application solves the problem of rear brake lock-up and sideslipping in conventional front disc and rear drum brake structures. In this application, when the rear brake lever is squeezed, the rear brake engages first, and then pushes the piston to squeeze the brake fluid, driving the front disc brake to engage. This linkage logic of the rear brake starting first and the front brake assisting later can avoid the rear brake being subjected to excessive force alone, and can reduce the occurrence of lock-up and skidding caused by excessive braking force on the rear wheels by having the front wheels share part of the braking force.

[0016] In addition, the clearance between the two rocker arms in this application ensures that the rear brake engages before the front brake, which is consistent with the physical characteristic of the center of gravity shifting forward during braking, meaning that the front wheels can withstand more braking force; and by supplementing the braking force of the front wheels, the risk of the rear wheels exceeding the grip limit when braking alone is reduced, further suppressing the risk of the rear wheels locking up and skidding.

[0017] This application solves the problem of the stiff feel of the rear drum brake handle by using a lever mechanism. The lever mechanism in this application has a labor-saving effect. The two rocker arms form a lever structure. The pulling force is amplified from the rocker arms and then pushed to push the piston, which can reduce the operating force required to drive the rear drum brake and reduce the resistance when squeezing, thereby improving the problem of the stiff and laborious operation of the conventional rear drum brake handle. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this application.

[0019] Figure 2 This is a schematic diagram of the overall structure of this application, showing the brake cable.

[0020] Figure 3 This is a schematic diagram of the exploded structure of this application.

[0021] The components are: 1. Valve body; 2. Brake cable; 3. Piston; 4. Spring; 5. First rocker arm; 6. Second rocker arm; 101. Hydraulic oil chamber; 201. First cable; 202. Second cable; 601. Boss; 602. Hook; 501, cable hole; 502, open slot; 503, shaft hole. Detailed Implementation

[0022] The specific embodiments of this application are described below with reference to the accompanying drawings.

[0023] Example 1 like Figure 1 As shown, the main structure of this application includes: a lever structure composed of a first rocker arm 5 and a second rocker arm 6, which is installed on the valve body 1; a piston 3 is provided at the opening of the hydraulic oil chamber 101 on the valve body 1, and a spring 4 is sleeved on the piston 3, with the initial height of the spring 4 being higher than the height of the piston 3.

[0024] Reference Figure 2 The first rocker arm 5 and the second rocker arm 6 are fixed to the valve body 1 by a pin. The first rocker arm 5 has a shaft hole 503 and two cable holes 501. The cable holes 501 are used to install the front brake cable and the rear brake cable. The front brake cable is not an improvement in this application, so it is hidden in the attached drawings to improve readability. The rear brake cable is divided into a first cable 201 and a second cable 202. As shown in the figure, the first cable 201 is located above the valve body 1, and the second cable 202 is located below the valve body 1 to facilitate understanding of the braking process.

[0025] Reference Figure 3The second rocker arm 6 is fixed to the valve body 1 together with the first rocker arm 5 through the shaft hole 503. One end of the second rocker arm 6 is provided with a hook 602 to cooperate with the first rocker arm 5, and the other end of the second rocker arm 6 is provided with a boss 601, which contacts the piston 3 of the valve body 1. The shaft hole 503 is opened at the middle position of the second rocker arm 6, thus forming a lever structure. The hook 602 is hung on the side of the first rocker arm 5 facing the piston 3. When the first rocker arm 5 is driven, it rotates counterclockwise, that is, the first rocker arm 5 swings towards the hook 602, pushing the second rocker arm 6 to swing around the hinge point. During the swinging process of the second rocker arm 6, one end of the boss 601 presses the spring 4 to deform, and continues to press until the piston 3 is pressed. The piston 3 pushes the brake fluid through the oil pipe into the front brake caliper to realize the front wheel braking.

[0026] In one embodiment of this application, the valve body 1 and the piston 3 are an integral assembly, and the restoring force of the spring 4 is used to assist the second rocker arm 6 and the first rocker arm 5 to return to their normal positions, preventing abnormal mechanical structure from failing to return to their normal positions and abnormal braking. In the vehicle assembly process, according to Figure 2 In the middle position, the upper round hole on the first rocker arm 5 is connected to the rear brake handle through a cable, and the lower round hole is connected to the rear drum brake. The upper pump of the front disc brake is connected to the inlet and outlet of the valve body 1 through an oil pipe. The front brake caliper is connected to the inlet and outlet of the valve body 1 through an oil pipe. The inlet and outlet of the valve body 1 are connected to an external brake fluid reservoir to replenish the brake fluid to the valve body 1. In this way, the front disc and rear drum CBS assembly is connected and assembled.

[0027] In use, after installing the first rocker arm 5 and the second rocker arm 6, insert the front brake cable head and the rear brake cable head into the corresponding cable holes 501 respectively. The first cable 201 pulls the first rocker arm 5, and the first rocker arm 5 drives the second rocker arm 6. The second rocker arm 6 rotates counterclockwise as shown in the figure, pushing the piston 3. At this time, the spring 4 is compressed, and the piston 3 pressurizes the hydraulic oil to achieve simultaneous braking at both ends.

[0028] The working principle of this application is as follows: when the front brake lever is squeezed, the oil from the upper pump enters the valve body 1 through the inlet and outlet ports, and then directly enters the front brake caliper through the inlet and outlet ports to achieve individual braking of the front wheels; this part is the conventional braking principle, which will not be described in detail in this embodiment.

[0029] When the rear brake handle is squeezed, the first rocker arm 5 and the second rocker arm 6 are rotated counterclockwise via the first cable 201. When the first rocker arm 5 rotates, due to the gap between the first rocker arm 5 and the second rocker arm 6, the second cable 202 is driven first, and the second cable 202 drives the rear drum brake to work and generate braking. Then, under the leverage force, the boss 601 of the second rocker arm 6 overcomes the movement of the return spring 4 and the piston 3. The brake fluid in the valve body 1 is pushed by the piston 3 to generate pressure on the front brake caliper piston 3, causing the front wheel system to brake. The gap between the first rocker arm 5 and the second rocker arm 6 can ensure that there is a time difference between pulling the rear drum brake and the hydraulic brake, so that the rear brake engages first and the front brake engages later. This can avoid the front wheels engaging too early, which may cause nose-diving or lock-up and loss of control. In this way, the front brake brakes the front wheel system separately, and the rear brake brakes the front and rear wheel systems simultaneously, achieving smooth braking and improving the braking safety of the whole vehicle.

[0030] Example 2 In one embodiment of this application, the first rocker arm 5 is provided with two circular holes as cable holes 501, and an opening groove 502 is provided next to the cable holes 501. This structure can prevent the cable from falling off. A shaft hole 503 is provided to connect to the valve body 1. The anti-disengagement principle is as follows: the cable hole 501 on the first rocker arm 5 is used to connect the brake cable head, and the design of the opening groove 502 can form a lateral limit on the cable inserted into the cable hole 501. When the cable head is inserted into the circular hole, the opening groove 502 can lock the cable body part, preventing the cable from accidentally slipping out of the circular hole due to force fluctuations during the rotation of the first rocker arm 5 or the vibration of the vehicle, thereby ensuring the stable connection between the cable and the first rocker arm 5, ensuring that the power transmission of the brake cable is not affected, and maintaining the normal operation of the braking system.

[0031] The above description is an explanation of this application and not a limitation thereof. The scope of this application is defined by the claims. Within the scope of protection of this application, any form of modification may be made.

Claims

1. A front disc and rear drum linkage valve, characterized in that: It possesses braking characteristics of engaging the rear brakes first and engaging the front brakes last. The front disc and rear drum linkage valve includes a valve body (1), on which a brake cable (2) and a lever assembly driven by the brake cable (2) are provided. The valve body (1) is provided with a hydraulic oil chamber (101), and a pressable piston (3) is provided at the opening of the hydraulic oil chamber (101); the lever assembly is driven by the brake cable (2) to press the piston (3) to realize hydraulic braking. The brake cable (2) is connected to the rear brake handle at one end and to the rear drum brake at the other end; there is a delay between the two actions of the brake cable (2) driving the rear drum brake and driving the lever assembly to press the piston (3).

2. The front disc and rear drum linkage valve as described in claim 1, characterized in that: The lever assembly includes: The first rocker arm (5) is rotatably mounted on the valve body (1), connected to the brake cable (2), and driven by the brake cable (2). The second rocker arm (6) is rotatably connected to the valve body (1) and is driven by the first rocker arm (5); the movable end of the second rocker arm (6) presses the piston (3).

3. The front disc and rear drum linkage valve as described in claim 2, characterized in that: The gap between the first rocker arm (5) and the second rocker arm (6) is set.

4. The front disc and rear drum linkage valve as described in claim 2, characterized in that: A spring (4) is coaxially sleeved on the piston (3). The spring (4) is in contact with the second rocker arm (6) in its initial state. The spring (4) applies a thrust to the second rocker arm (6) with its restoring force.

5. The front disc and rear drum linkage valve as described in claim 4, characterized in that: The second rocker arm (6) has a boss (601) formed at one end near the piston (3). The boss (601) extends into the spring (4) and presses the piston (3) as the second rocker arm (6) swings.

6. The front disc and rear drum linkage valve as described in claim 2, characterized in that: The hinge point of the second rocker arm (6) is located at the midpoint of the second rocker arm (6).

7. The front disc and rear drum linkage valve as described in claim 2, characterized in that: The second rocker arm (6) has a hook (602) formed at one end away from the piston (3). The hook (602) is fastened to one side of the swing direction of the first rocker arm (5), and the first rocker arm (5) applies a thrust to the hook (602).

8. The front disc and rear drum linkage valve as described in claim 2, characterized in that: The first rocker arm (5) is provided with a cable hole (501), and the brake cable (2) includes a front brake cable and a rear brake cable, which are respectively installed in the cable hole (501).

9. The front disc and rear drum linkage valve as described in claim 8, characterized in that: An opening groove (502) is provided on the side of the cable hole (501) on the first rocker arm (5) to prevent the brake cable (2) from falling off.

10. A two-wheeled vehicle, characterized in that: It is equipped with a front disc and rear drum linkage valve as described in any one of claims 1-9.

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