CN218616611U - Push rod assembly, braking system and vehicle - Google Patents

Abstract

Disclosed herein are a push rod assembly, a brake system and a vehicle. The push rod assembly comprises a main push rod, a piston rod, a first ball head seat and a limiting piece, wherein the piston rod is connected with the main push rod and moves along with the main push rod; an inner cavity is formed in one end of the piston rod, the main push rod comprises a ball head arranged at one end, and the ball head extends into the inner cavity; the first ball head seat is matched with the spherical surface of the ball head and can rotationally fix the ball head in the inner cavity, and the limiting piece fixes the ball head seat in the inner cavity so as to limit the ball head and the ball head seat from falling out of the inner cavity. The push rod assembly disclosed herein is convenient to assemble and control the overall size of the connecting structure.

Description

A push rod assembly, braking system and vehicle

technical field

The present application relates to but not limited to vehicle braking technology, especially a push rod assembly, braking system and vehicle.

Background technique

With the upgrade of the brake-by-wire system, the smart booster is constantly updated and iterated, gradually integrating various functions such as ESC (Electronic Stability Controller, automotive electronic stability control system), this kind of smart booster can be called IPB (Integrated Power Brake, Intelligent integrated braking system), during the working process of IPB, full decoupling is realized, the motor controls the electric master cylinder to compress the brake oil to achieve braking, and the input push rod is connected to the brake pedal to provide braking during the braking process intent, transmitted pedal displacement, and the role of mechanical backup.

The input push rod is connected to the pedal. When the pedal is pushed, the push rod is required to be able to rotate. Therefore, a push rod with a structure similar to a ball joint is required to be rotatably connected to the subsequent piston. However, this method is cumbersome to assemble, and The size of the spherical hinge structure is large, which increases the size of the piston, which is not conducive to the control of the overall size of the braking system.

Utility model content

Embodiments of the present application provide a push rod assembly, a braking system and a vehicle, which are convenient for assembly and control the overall size of the connection structure.

The embodiment of the present application provides a push rod assembly. The push rod assembly includes a main push rod, a piston rod, a first ball seat and a stopper. The piston rod is connected with the main push rod and moves along with the main push rod. rod movement;

One end of the piston rod is provided with an inner chamber, and the main push rod includes a ball head arranged at one end, and the ball head extends into the inner chamber; the first ball head seat and the spherical surface of the ball head fit and rotatably fix the ball head in the inner cavity, and the limiter fixes the ball head seat in the inner cavity to limit the ball head and the ball head seat from out of the lumen.

Further, the push rod assembly also includes a second ball seat arranged at the bottom of the inner cavity, and the first ball seat and the second ball seat are respectively located on both sides of the ball head to clamp the limited bit the ball head.

Further, the maximum central angle corresponding to the spherical surface contacted by the first ball head seat and the ball head is less than 180°, and/or, the maximum angle corresponding to the spherical surface contacted by the second ball head seat and the ball head The central angle is less than 180°.

Further, the end surface of the first ball seat includes a first plane and a first spherical surface, and the first plane is located outside the first spherical surface; the second ball seat includes a second plane and a second spherical surface, The second plane is located outside the second spherical surface;

A first gap is provided between the first plane and the second plane.

Further, the push rod assembly further includes a shock absorber disposed between the first ball seat and the limiting member.

Further, the shock absorbing member is interference-fitted between the first ball head seat and the limiting member, so that the first ball head seat presses against the ball head.

Further, the main push rod includes a connecting rod and the ball head, and the ball head is arranged at the end of the connecting rod;

The connecting rod passes through the first ball seat, the shock absorber and the limiter, and protrudes from the inner cavity; The second gap, and the second gap is set such that the connecting rod first touches the shock absorber before colliding with the first ball seat, the stopper, and the piston during rotation. .

Further, the shock absorber is a ring;

The axial length of the shock absorber is 4-5mm, and/or the inner diameter of the shock absorber is 8-9mm.

The embodiment of the present application also provides a braking system, the braking system includes a pedal, a master cylinder and the aforementioned push rod assembly, the pedal is connected to the end of the main push rod that is not provided with the ball head, and the piston Cooperate with the master cylinder.

An embodiment of the present application also provides a vehicle, which includes the aforementioned braking system.

Compared with some technologies, the present application has the following beneficial effects:

The push rod assembly provided by the embodiment of the present application is easy to assemble and has a reliable structure. The ball head is fixed in the inner cavity by the first ball head seat against the ball head. The dimensions of the connection, especially in the radial direction, facilitate controlling the dimensions of the piston rod. Moreover, through the way that the first ball head seat is against the ball head, it is convenient to install a shock-absorbing structure later, thereby reducing problems such as vibration and noise during the working process.

The brake system provided by the embodiment of the present application has the aforementioned push rod assembly, the power transmission is stable and smooth, the overall structure is relatively simple, and the work reliability is high.

The vehicle provided by the embodiment of the present application has low vibration and noise during driving, and high user satisfaction.

Additional features and advantages of the application will be set forth in the ensuing description.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

Fig. 1 is the structural representation of the push rod assembly described in the embodiment of the present application;

FIG. 2 is a schematic structural view of the head of the main push rod in FIG. 1 .

Graphical description:

1-main push rod, 11-ball head, 12-connecting rod, 2-piston rod, 21-inner cavity, 3-first ball seat, 31-first plane, 32-first spherical surface, 4-limit Parts, 5-the second ball seat, 51-the second plane, 52-the second spherical surface, 61-the first gap, 62-the second gap, 7-shock absorber, 8-pedal.

Detailed ways

In order to make the purpose, technical solution and advantages of the application clearer, the embodiments of the application will be described in detail below in conjunction with the accompanying drawings. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined arbitrarily with each other.

The current ball joint structure, in addition to the problem of size, also has the problem of large vibration and high noise: it is difficult to add shock absorbing components such as elastic parts in the ball joint structure, and there are problems when the assembly accuracy is relatively low. Severe vibration and noise problems.

The embodiment of the present application provides a push rod assembly, as shown in Figure 1 and Figure 2, the push rod assembly includes a main push rod, a piston rod, a first ball seat and a stopper, the piston rod is connected to the main push rod and Move with the main push rod; one end of the piston rod is provided with an inner chamber, the main push rod includes a ball head arranged at one end, and the ball head extends into the inner chamber; the first ball head seat cooperates with the spherical surface of the ball head and the ball head can Rotationally fixed in the inner cavity, the limiting member fixes the ball head seat in the inner cavity, so as to limit the ball head and the ball head seat to escape from the inner cavity.

The main push rod passes the braking force at the pedal through the piston rod into the subsequent master cylinder for braking.

The main push rod is connected with the piston rod, and the joint allows the main push rod and the piston rod to rotate relative to a certain angle to match the rotation of the pedal. In other words, the main push rod and the piston rod are not always in the same direction during the movement. On a straight line, there may be a certain angle between the two.

A ball head is provided at the rear end of the main push rod, and an inner chamber for accommodating the ball head is arranged in the piston rod. It is ensured that a relatively small angle of relative rotation can be generated between the two with the ball head as the center. Specifically, the first ball head seat is provided with a spherical surface that cooperates with the ball head, so that the ball head can be rotatably fixed in the inner cavity, so that the piston rod and the main push rod are limited in the axial direction. move together in the axial direction.

The limiter plays the role of installation and limit, and the limiter can directly touch the first ball head seat, so that the first ball head seat is limited and fixed; the first ball head seat is against the ball head of the main push rod, so that The ball head is limited in the inner cavity, and the piston rod is movably connected with the main push rod.

The stopper can be a snap ring, the snap ring is provided with a disconnected interface, and the inner wall of the inner cavity is provided with a mounting slot, and the snap ring is installed in the mounting slot to resist the ball head seat in the axial direction to prevent The ball head and ball head seat come out of the cavity.

The push rod assembly in the embodiment of the present application replaces the existing ball joint structure through "the first ball head seat rotatably fixes the ball head in the inner cavity of the piston rod", which is beneficial to reduce the overall size of the connection structure. Dimensions, especially the radial dimension: it is only necessary for the first ball head seat to bear against the ball head, and there is no need to cover the ball head like the existing ball joint structure.

In an exemplary embodiment, as shown in FIG. 1 and FIG. 2 , the push rod assembly further includes a second ball head seat arranged at the bottom of the inner cavity, and the first ball head seat and the second ball head seat are respectively located at the bottom of the ball head. On both sides, to clamp the limit ball head.

The first ball head seat is arranged at the front end of the ball head, the second ball head seat is arranged at the rear end of the ball head, and the first ball head seat and the second ball head seat are respectively arranged on both sides of the ball head, and are against the ball head from both sides. As for the ball head, a spherical surface cooperating with the ball head can also be arranged on the second ball head seat, so that the ball head is evenly stressed and rotates smoothly in the inner cavity.

The second ball seat can be directly fixed on the bottom of the inner cavity, forming an integral structure with the piston rod. For example: the rear end of the second ball seat can be provided with a protruding structure, and the bottom of the inner cavity is correspondingly provided with a groove structure. connect. The second ball head seat is fixedly connected with the piston rod, in other words, there will be no gap between the ball head seat and the piston rod, and there will be no problems such as noise caused by collision with each other.

The split ball seat of the first ball seat and the second ball seat replaces the existing ball joint structure, fully utilizes the space of the inner cavity, simplifies the connection structure, and reduces the size of the connection.

In an exemplary embodiment, the maximum central angle corresponding to the spherical surface contacted by the first ball seat and the ball head is less than 180°, and/or, the maximum central angle corresponding to the spherical surface contacted by the second ball seat and the ball head Less than 180°.

As shown in Figure 2, the contact part of the first ball seat and the ball head is a spherical surface, and the spherical surface of the contact part is less than half of the overall spherical surface of the ball head. In other words, the maximum central angle α corresponding to the spherical surface of the contact part is less than 180°, avoiding the The radial size of the first ball head exceeds the diameter of the ball head too much, so that the radial size of the first ball head is as close as possible to the diameter of the ball head, thereby reducing the connection structure of "ball head + first ball head" The overall size, especially the radial size, is beneficial to control the radial size of the piston rod.

The second ball head seat is the same as the first ball head seat, and will not be repeated here.

In an exemplary embodiment, as shown in FIG. 2 , the end surface of the first ball seat includes a first plane and a first spherical surface, and the first plane is located outside the first spherical surface; the second ball seat includes a second plane and a first spherical surface. The second spherical surface, the second plane is located outside the second spherical surface; a first gap is set between the first plane and the second plane.

The ball head is located between the first spherical surface and the second spherical surface, and is clamped and supported by the first spherical surface and the second spherical surface, and the ball head can rotate.

A first gap is set between the first plane and the second plane, in other words, there is no contact between the first ball head seat and the second ball head seat, and the two are separated by a certain distance by the ball head.

The first ball head seat and the second ball head seat do not touch at the highest point and the lowest point of the ball head, avoiding covering the ball head at the highest point and the lowest point of the ball head, thereby reducing the "ball head + The overall size of the "ball seat", especially the radial size (the upper and lower dimensions in Figure 2).

In an exemplary embodiment, as shown in FIG. 2 , the push rod assembly further includes a shock absorber disposed between the first ball seat and the limiting member.

A shock absorber is arranged between the first ball head seat and the limiter to avoid collisions between the second ball head seat, the ball head, the first ball head seat and the limiter during the movement of the main push rod. noise.

The shock absorber is arranged between the first ball head seat and the limiter, and while having a shock absorbing effect, it will not be worn by the rotatable ball head, thereby ensuring the working reliability of the shock absorber.

In an exemplary embodiment, as shown in FIG. 2 , the shock absorbing member is interference-fitted between the first ball head seat and the limiting member, so that the first ball head seat is pressed against the ball head.

After the shock absorber is installed, the shock absorber is installed between the first ball seat and the limiter with interference, so that the gap between the second ball seat, the ball head, the first ball seat and the limiter is eliminated , so as to avoid the noise generated by the collision between the components due to the existence of axial clearance during the movement of the main push rod, and, after eliminating the clearance to avoid collision, the working reliability and service life of the ball head can also be improved, and the user Brake feedback effect.

The pre-tightening force when the shock absorber is installed can be adjusted according to actual needs.

The shock absorber can be an elastic member, such as a rubber spring pad; of course, in some cases, the shock absorber can also be a spring.

When the pedal is released, the return function of the elastic member pushes the main push rod and the pedal to return to their original positions. At this time, the elastic member plays the role of shock absorption and noise reduction.

In an exemplary embodiment, as shown in Figure 2, the main push rod includes a connecting rod and a ball head, and the ball head is arranged at the end of the connecting rod; the connecting rod passes through the first ball head seat, the shock absorber and the stopper part, and protrude from the inner cavity; there is a second gap between the shock absorbing part and the connecting rod, and the second gap is set so that: the connecting rod and the first ball seat, the limiter, and the piston are in the process of rotation. Before a collision, hit the shock absorber first.

The shock absorber can not only eliminate the gap in the axial direction to prevent the impact of the components in the axial direction, but also prevent the connecting rod from colliding with the first ball seat, the limiter and the piston in the radial direction.

When the pedal is fully depressed, the main push rod and the piston rod are not in a straight line, and the main push rod has a certain inclination at this time. As shown in Figure 1, it is when the pedal has not been stepped on; when the pedal is fully depressed, the pedal turns clockwise, the main push rod moves to the left and the height of the right end increases, and the height of the left end of the main push rod remains unchanged but the position is relative Lower, the main push rod forms a certain angle with the horizontal direction.

When the pedal is fully depressed, the connecting rod can be offset against the inner ring of the shock absorber, and the shock absorber can limit the connecting rod to a certain extent, preventing the connecting rod from contacting the first ball seat, the limiter, the piston Crashes happen, avoiding unnecessary wear and tear.

In practical applications, the inner diameter of the shock absorber is smaller than the inner diameter of the first ball seat and the stopper, so as to avoid the connecting rod from colliding with the first ball seat or the stopper during rotation, in other words, the shock absorber and the connection The gap between the rods is small, while the gap between the first ball seat, the stopper and the connecting rod is relatively large, so that the connecting rod first touches the shock absorber before colliding with the first ball seat or the stopper parts to avoid unnecessary wear and tear.

In an exemplary embodiment, the shock absorber is an annular member; the axial length of the shock absorber is 4-5mm, and/or the inner diameter of the shock absorber is 8-9mm.

The shock absorber may be an annular member for the connecting rod to pass through. The axial length of the shock absorber can be 4-5mm, and the opening diameter can be 8-9mm. Certainly, in actual application, the actual size of the shock absorbing member may be adjusted according to different application scenarios, which is not limited in the present application.

The embodiment of the present application also provides a brake system. The brake system includes a pedal, a master cylinder and the aforementioned push rod assembly. The pedal is connected to the end of the master push rod without a ball head, and the piston cooperates with the master cylinder.

When the pedal receives the braking force, it is transmitted to the main push rod of the intelligent booster, and the main push rod pushes the piston rod to move to the master cylinder to compress the brake fluid, so as to cooperate with the simulator to produce a pedal feeling that matches the braking force; at the same time, the intelligent booster After receiving the braking intention, the motor pushes the electric master cylinder to compress the brake fluid to provide brake boost.

The brake system provided by the embodiment of the present application has the aforementioned push rod assembly, the power transmission is stable and smooth, the overall structure is relatively simple, and the work reliability is high.

An embodiment of the present application also provides a vehicle, which includes the aforementioned braking system.

The vehicle provided by the embodiment of the present application has low vibration and noise during driving, and the user experience is good.

In the description in this application, it should be noted that the orientation or positional relationship indicated by "upper", "lower", "one end", "one side", etc. is based on the orientation or positional relationship shown in the drawings, and is only To facilitate the description of the present application and to simplify the description, it does not indicate or imply that the referred structure has a specific orientation, is constructed and operates in a specific orientation, and thus should not be construed as limiting the present application.

In the description of the embodiments of this application, unless otherwise specified and limited, the terms "connection", "assembly", and "installation" should be understood in a broad sense. For example, the term "connection" can be a fixed connection or an optional Disassembled connection, or integral connection; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

The embodiments described in this application are illustrative rather than restrictive, and it will be obvious to those of ordinary skill in the art that more embodiments are possible within the scope of the embodiments described in this application and implementation plans. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Except where expressly limited, any feature or element of any embodiment may be used in combination with, or substituted for, any other feature or element of any other embodiment.

This application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application can also be combined with any conventional features or elements to form a unique technical solution defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other technical solutions to form another unique technical solution defined by the claims. It is therefore to be understood that any of the features shown and/or discussed in this application can be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be limited except in accordance with the appended claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.

Claims (10)

1. A push rod assembly, characterized in that it comprises a main push rod, a piston rod, a first ball seat and a stopper, the piston rod is connected with the main push rod and moves with the main push rod; One end of the piston rod is provided with an inner chamber, and the main push rod includes a ball head arranged at one end, and the ball head extends into the inner chamber; the first ball head seat and the spherical surface of the ball head fit and rotatably fix the ball head in the inner cavity, and the limiter fixes the ball head seat in the inner cavity to limit the ball head and the ball head seat from out of the lumen. 2. The push rod assembly according to claim 1, further comprising a second ball seat arranged at the bottom of the inner cavity, the first ball seat and the second ball seat are respectively located at The two sides of the ball head are used to clamp and limit the ball head. 3. The push rod assembly according to claim 2, characterized in that, the maximum central angle corresponding to the spherical surface contacted by the first ball seat and the ball head is less than 180°, and/or, the second The maximum central angle corresponding to the spherical surface contacted by the ball head seat and the ball head is less than 180°. 4. The push rod assembly according to claim 2, wherein the end surface of the first ball seat includes a first plane and a first spherical surface, and the first plane is located outside the first spherical surface; The second ball seat includes a second plane and a second spherical surface, and the second plane is located outside the second spherical surface; A first gap is provided between the first plane and the second plane. 5. The push rod assembly according to claim 1, further comprising a shock absorber disposed between the first ball seat and the limiting member. 6. The push rod assembly according to claim 5, wherein the shock absorbing member is interference-fitted between the first ball seat and the limiting member, so that the first ball seat Squeeze against the ball head. 7. The push rod assembly according to claim 5, wherein the main push rod comprises a connecting rod and the ball head, and the ball head is arranged at an end of the connecting rod; The connecting rod passes through the first ball seat, the shock absorber and the limiter, and protrudes from the inner cavity; The second gap, and the second gap is set such that the connecting rod first touches the shock absorber before colliding with the first ball seat, the stopper, and the piston during rotation. . 8. The push rod assembly according to claim 5, wherein the shock absorber is a ring; The axial length of the shock absorber is 4-5mm, and/or the inner diameter of the shock absorber is 8-9mm. 9. A brake system, characterized in that it comprises a pedal, a master cylinder and the push rod assembly according to any one of claims 1 to 8, the pedal and the main push rod are not provided with the ball head One end is connected, and the piston cooperates with the master cylinder. 10. A vehicle, characterized by comprising the brake system according to claim 9.

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