A piston movement limiting structure in the cylinder of a clutch booster

Abstract

This invention proposes a piston movement limiting structure within a clutch booster cylinder. The structure includes a cylinder body with a piston connected inside. A connecting hole penetrating both the inner and outer sides of the cylinder body is provided on the side wall of the cylinder body. A limiting rod is connected within the connecting hole, with one end extending into the cylinder body and the other end having an annular groove on its outer side wall. A mounting hole is provided radially along the connecting hole on the cylinder body, and an alarm device is installed within the mounting hole. The alarm device has a collision rod extending into the groove. When the piston collides with the limiting rod, the limiting rod moves, and the side wall of the groove collides with the collision rod, triggering an alarm signal from the alarm device. When the piston moves beyond its limit position, it collides with the limiting rod, causing the limiting rod to move further, and the side wall of the groove on the limiting rod contacts the collision rod, activating the alarm device and triggering an alarm signal.

Description

Technical Field

[0001] This utility model relates to the field of clutch booster technology, specifically to a piston movement limiting structure in the cylinder of a clutch booster. Background Technology

[0002] An automotive clutch booster includes a cylinder body containing a reciprocating piston. To prevent the piston from moving to its extreme positions (such as touching the bottom of the cylinder body or exceeding its extreme position), a limit alarm structure is required at the bottom of the cylinder body.

[0003] The applicant filed a utility model patent application on July 4, 2024, with patent number CN202421590287.3, entitled "A Clutch Booster Cylinder with a Limit Alarm Device." This application provides a new technical solution to address the aforementioned technical problems. Utility Model Content

[0004] In view of the problems pointed out in the background art, this utility model proposes a piston movement limiting structure in the cylinder of a clutch booster to solve the above-mentioned technical problems.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A piston movement limiting structure in a clutch booster cylinder includes a cylinder body with a piston connected inside. A connecting hole penetrating both the inner and outer sides of the cylinder body is provided on the side wall of the cylinder body. A limiting rod is connected within the connecting hole, with one end of the limiting rod extending into the cylinder body. An annular groove is provided on the outer side wall of the other end of the limiting rod. An mounting hole is provided on the cylinder body radially along the connecting hole, and an alarm device is installed within the mounting hole. The alarm device has a collision rod extending into the groove. When the piston collides with the limiting rod, the limiting rod moves, and the side wall of the groove collides with the collision rod, triggering an alarm signal from the alarm device.

[0007] The present invention is further configured such that one axial end of the cylinder body is open, an end cap is connected to the open end of the cylinder body, a column is provided on the end cap, a connecting hole is provided through the end cap and the column, and a mounting hole is provided along the radial direction of the column.

[0008] The present invention is further configured such that the end of the column is provided with a connecting groove coaxial with the connecting hole, and also includes a connecting pipe with one end closed, the open end of the connecting pipe being fixedly connected to the connecting groove, a return spring being connected inside the connecting pipe, the other end of the limiting rod extending into the connecting pipe, one end of the return spring abutting against the limiting rod, and the other end of the return spring abutting against the closed end of the connecting pipe.

[0009] The present invention is further configured such that an annular limiting ring is provided on the outer wall of the other end of the limiting rod, the limiting ring is located inside the connecting pipe, the outer diameter of the limiting ring is larger than the diameter of the connecting hole, and the return spring abuts against the limiting ring.

[0010] The present invention is further provided that the outer wall of the limiting rod is provided with an annular groove for connecting the limiting ring.

[0011] The present invention is further configured such that, in the axial direction of the limiting rod, the two sides of the groove are inclined surfaces.

[0012] The present invention is further configured such that the end cap is provided with a cylindrical cylinder communicating with the interior of the cylinder body, and a push rod is slidably connected inside the cylindrical rod, the push rod being connected to the piston.

[0013] The present invention is further provided with a sealing ring between the limiting rod and the connecting hole.

[0014] The present invention is further configured such that the inner diameter of the connecting pipe gradually decreases from the open end to the other end.

[0015] The present invention is further configured such that a spring is provided between the piston and the end cap.

[0016] By adopting the above technical solution, the beneficial effects of this utility model are as follows:

[0017] The piston movement limiting structure in the clutch booster cylinder provided by this utility model will cause the piston to collide with the limiting rod when the piston moves beyond its limit position. As the limiting rod moves, the side wall of the groove on the limiting rod will touch the collision rod, and the alarm device will be activated and issue an alarm signal. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the clutch booster of this utility model.

[0020] Figure 2 This is a schematic diagram of the internal structure of the clutch booster of this utility model. Figure 1 .

[0021] Figure 3 This is a schematic diagram of the internal structure of the clutch booster of this utility model. Figure 2 .

[0022] Figure 4 This is a schematic diagram of the structure of the limiting rod, connecting tube, and return spring of this utility model.

[0023] Figure 5 This is a schematic diagram of the alarm device and limit rod of this utility model.

[0024] The following are the labels in the attached diagram: Cylinder 1, Piston 2, Connecting hole 3, Limiting rod 4, Groove 5, Mounting hole 6, Alarm device 7, Collision rod 8, End cap 9, Column 10, Connecting groove 11, Connecting pipe 12, Return spring 13, Limiting ring 14, Annular groove 15, Columnar cylinder 16, Push rod 17. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] For reference as follows Figures 1-5 The present invention will be described as follows:

[0027] Example: A piston movement limiting structure in a clutch booster cylinder, comprising a cylinder 1, which serves as a load-bearing base.

[0028] A piston 2 is connected inside the cylinder body 1. A connecting hole 3 is provided on the side wall of the cylinder body 1, which penetrates the inner and outer sides of the cylinder body 1. The connecting hole 3 provides a sliding channel for the limit rod 4, ensuring that the limit rod 4 can move stably along the axial direction of the connecting hole 3.

[0029] A limiting rod 4 is slidably connected inside the connecting hole 3. One end of the limiting rod 4 extends into the cylinder 1 and can directly collide with the piston 2.

[0030] The other end of the limiting rod 4 has an annular groove 5 on its outer wall, which engages with the collision rod 8 of the alarm device 7. This structural design organically combines mechanical triggering with alarm functions.

[0031] The cylinder body 1 has a mounting hole 6 along the radial direction of the connecting hole 3. The mounting hole 6 communicates with the connecting hole 3, providing a stable mounting position for the alarm device 7, ensuring that the collision rod 8 can be accurately inserted into the groove 5, and ensuring the reliable transmission of the trigger signal.

[0032] An alarm device 7 is installed in the mounting hole 6. The alarm device 7 has a collision rod 8 that extends into the groove 5.

[0033] In terms of operation, when piston 2 moves within cylinder 1, if its movement distance exceeds the preset safety limit, piston 2 will collide with the end of limit rod 4 extending into cylinder 1. Since limit rod 4 is slidably connected to connecting hole 3, under the impact force, limit rod 4 will move axially outward along connecting hole 3. At this time, groove 5 on limit rod 4 moves synchronously, and the sidewall of groove 5 will contact and collide with collision rod 8 extending into groove 5 in alarm device 7. After collision rod 8 is subjected to the force of the sidewall of groove, it will trigger the mechanical or electronic sensing mechanism inside alarm device 7, causing alarm device 7 to quickly issue an alarm signal, thereby promptly reminding the driver or relevant personnel that the piston has exceeded the safe movement range.

[0034] From a functional perspective, this structure offers at least the following advantages: First, the limit rod 4 physically blocks the movement of piston 2, effectively preventing it from moving further towards the bottom of cylinder 1 or other extreme positions. This avoids direct collisions between piston 2 and cylinder 1, reducing wear and extending the service life of the components. Second, the linkage between the alarm device 7 and the limit rod 4 enables an "alarm upon limit" function. When piston 2 touches the limit rod 4, an alarm signal is issued in real time, solving the problem of undetected piston overtravel in existing technologies. This provides timely warnings to the driver, facilitating appropriate actions (such as adjusting pedal travel or checking the hydraulic system), and reducing the risk of clutch system malfunctions caused by piston overtravel. Third, all components are connected mechanically, eliminating the need for complex electronic sensing systems. This results in a simple structure, high reliability, and low maintenance costs, enabling it to adapt to complex conditions such as vibration and temperature changes during vehicle operation. Fourth, the design of the annular groove 5 ensures that when the limiting rod 4 is not impacted, the collision rod 8 is inside the groove 5 and will not trigger an alarm. Only when the limiting rod 4 moves to a specific position will the side wall of the groove contact the collision rod 8. This design ensures that the alarm signal triggering has a clear threshold and avoids false alarms.

[0035] One end of the cylinder body 1 is open along the axial direction, and an end cover 9 is connected to the open end of the cylinder body 1. This structural design facilitates the installation and maintenance of the internal components of the cylinder body 1, and the end cover 9 can form a seal inside the cylinder body 1 to ensure the sealing of the internal working environment of the cylinder body 1.

[0036] The end cap 9 is provided with a column 10, which provides a reasonable mounting medium for the connection hole 3 and the mounting hole 6.

[0037] The connecting hole 3 is set through the end cap 9 and the column 10, which makes the installation path of the limit rod 4 more reasonable and can be inserted into the cylinder 1 more accurately to cooperate with the piston 2.

[0038] Mounting holes 6 are arranged radially along the column 10. This makes the installation position of the alarm device 7 more stable and ensures that the collision rod 8 and the groove 5 on the limit rod 4 fit precisely, reducing the impact of positional deviation on alarm triggering.

[0039] The end of the column 10 is provided with a connecting groove 11 coaxial with the connecting hole 3, and also includes a connecting tube 12 closed at one end. The open end of the connecting tube 12 is fixedly connected to the connecting groove 11 (threaded connection). A return spring 13 is connected inside the connecting tube 12. The other end of the limiting rod 4 extends into the connecting tube 12. One end of the return spring 13 abuts against the limiting rod 4, and the other end of the return spring 13 abuts against the closed end of the connecting tube 12.

[0040] The return spring 13 inside the connecting tube 12 plays a crucial role in the movement of the limiting rod 4. When the piston 2 collides with the limiting rod 4, the limiting rod 4 moves into the connecting tube 12, and the return spring 13 is compressed, storing elastic potential energy. After the collision, the return spring 13 releases the elastic potential energy, pushing the limiting rod 4 to reset, ensuring that the limiting rod 4 can repeatedly perform its limiting function, and avoiding the failure of the limiting rod 4 to reset, which would affect the normal movement and limiting of the piston 2.

[0041] An annular limiting ring 14 is provided on the outer wall of the other end of the limiting rod 4. The limiting ring 14 is located inside the connecting pipe 12, and the outer diameter of the limiting ring 14 is larger than the diameter of the connecting hole 3. The return spring 13 abuts against the limiting ring 14. As the abutting part of the return spring 13, the limiting ring 14 can evenly transmit the elastic force of the return spring 13 to the limiting rod 4, ensuring that the limiting rod 4 is under force balance. At the same time, it can limit the stroke of the limiting rod 4 moving into the cylinder 1 under the action of the return spring 13, and prevent the limiting rod 4 from extending too far into the cylinder 1 and affecting the normal movement of the piston 2.

[0042] The outer wall of the limiting rod 4 is provided with an annular groove 15 for connecting the limiting ring 14. The annular groove 15 is used to connect the limiting ring 14, making the connection between the limiting ring 14 and the limiting rod 4 more stable and preventing the limiting ring 14 from axially displacing during the movement of the limiting rod 4.

[0043] Along the axial direction of the limiting rod 4, the two sides of the groove 5 are inclined surfaces. When the limiting rod 4 moves, the inclined surfaces make the contact between the side wall of the groove 5 and the collision rod 8 smoother, reducing the impact force at the moment of collision and reducing the wear of both. At the same time, it can also more accurately trigger the alarm device 7, ensuring the timely issuance of the alarm signal.

[0044] The end cap 9 is equipped with a cylindrical cylinder 16 that communicates with the interior of the cylinder body 1. A push rod 17 is slidably connected inside the cylindrical cylinder, and the push rod 17 is connected to the piston 2. The movement of the piston 2 can transmit force through the push rod 17 to realize the disengagement or engagement of the clutch. The cylindrical cylinder 16 provides a stable sliding track for the push rod 17, ensuring the linearity of the push rod 17's movement, and thus ensuring the stability of the piston 2's movement.

[0045] A sealing ring is provided between the limit rod 4 and the connecting hole 3. This effectively prevents hydraulic oil or gas inside the cylinder 1 from leaking through the gap between the connecting hole 3 and the limit rod 4, ensuring stable pressure inside the cylinder 1 and maintaining the normal working performance of the clutch booster.

[0046] The inner diameter of the connecting tube 12 gradually decreases from the open end to the other end. This structure can guide the compression process of the return spring 13, prevent the spring from shifting or tilting during compression, ensure stable output of spring force, and also adapt to the shape of the return spring 13 after compression, improving space utilization.

[0047] A spring is provided between piston 2 and end cap 9. During the movement of piston 2, it can provide a certain buffering force to reduce the impact force when piston 2 collides with end cap 9 or other components. At the same time, it can assist piston 2 to return to its original position quickly during the reset process, thereby improving the response speed of piston 2.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A piston movement limiting structure within a clutch booster cylinder, comprising a cylinder body and a piston connected within the cylinder body, characterized in that: The cylinder body has a connecting hole on its side wall that runs through both the inner and outer sides of the cylinder body. A limit rod is connected to the connecting hole, with one end of the limit rod extending into the cylinder body. The outer side wall of the other end of the limit rod has an annular groove. The cylinder body has a mounting hole along the radial direction of the connecting hole, and an alarm device is installed in the mounting hole. The alarm device has a collision rod that extends into the groove. When the piston collides with the limit rod, the limit rod moves, and the side wall of the groove collides with the collision rod, triggering an alarm signal from the alarm device.

2. The piston movement limiting structure in the cylinder of a clutch booster according to claim 1, characterized in that: One end of the cylinder body is open along its axial direction. An end cap is connected to the open end of the cylinder body. A column is provided on the end cap. A connecting hole is provided through the end cap and the column. An installation hole is provided along the radial direction of the column.

3. The piston movement limiting structure in the cylinder of a clutch booster according to claim 2, characterized in that: The end of the column is provided with a connecting groove coaxial with the connecting hole, and also includes a connecting pipe closed at one end. The open end of the connecting pipe is fixedly connected to the connecting groove. A return spring is connected inside the connecting pipe. The other end of the limiting rod extends into the connecting pipe. One end of the return spring abuts against the limiting rod, and the other end of the return spring abuts against the closed end of the connecting pipe.

4. The piston movement limiting structure in the cylinder of a clutch booster according to claim 3, characterized in that: The other end of the limiting rod is provided with an annular limiting ring on its outer side wall. The limiting ring is located inside the connecting pipe, and the outer diameter of the limiting ring is larger than the diameter of the connecting hole. The return spring abuts against the limiting ring.

5. The piston movement limiting structure in the cylinder of a clutch booster according to claim 4, characterized in that: The outer wall of the limiting rod is provided with an annular groove for connecting the limiting ring.

6. The piston movement limiting structure in the cylinder of a clutch booster according to claim 1, characterized in that: Along the axial direction of the limiting rod, the two sides of the groove are inclined surfaces.

7. The piston movement limiting structure in the cylinder of a clutch booster according to claim 2, characterized in that: The end cap is provided with a cylindrical cylinder that communicates with the interior of the cylinder body. A push rod is slidably connected inside the cylindrical rod, and the push rod is connected to the piston.

8. The piston movement limiting structure in the cylinder of a clutch booster according to claim 1, characterized in that: A sealing ring is provided between the limiting rod and the connecting hole.

9. The piston movement limiting structure in the cylinder of a clutch booster according to claim 4, characterized in that: The inner diameter of the connecting pipe gradually decreases from the open end to the other end.

10. The piston movement limiting structure in the cylinder of a clutch booster according to claim 1, characterized in that: A spring is provided between the piston and the end cap.

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