A locking cylinder for a trolley bridge of an automobile

Abstract

The present invention discloses a locking cylinder for a follower axle of an automobile, comprising a front cover, a rear cover, a push rod disc assembly and a connecting fork, a membrane being provided between the front cover and the rear cover, a reset spring being provided between the membrane and the front cover, a guide cylinder being provided on the front cover, the front side of the front cover being a mounting surface, the reset spring being against the inner plane of the mounting surface, the push rod disc assembly comprising a piston rod and a push rod, the guide cylinder being sleeved on the piston rod, and the piston rod and the guide cylinder being slidably connected, the present invention has a guide cylinder, which makes the piston rod of the push rod disc assembly more stable when moving, and makes the guide cylinder extend out in front of the mounting surface, so that it is closer to the point of application of the force on the connecting fork, thereby further enhancing stability.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile steering systems, and more particularly relates to a locking cylinder for an automobile tag axle. Background Art

[0002] The locking cylinder is a component in the automobile steering system. It is installed on the tag axle of a large trailer and is used to lock the steering of the tag axle. In order to improve the carrying capacity, large trailers are generally equipped with several sets of supporting bridges. In order to reduce the turning radius as much as possible and facilitate steering and U-turn operations in limited space, the supporting bridge is designed to be a tag axle that can be steered with follower. In order to improve the stability and controllability during normal driving, it plays a vital role in the safe driving of the car. When the car is driving at high speed, the wheels will swing violently as the speed increases, making it difficult to control the direction of the car. At this time, the car steering system will control the action of the locking cylinder according to the wheel speed. The locking cylinder is locked, so that the car wheels are in a locked state, thereby effectively avoiding the violent swing of the wheels when the car is driving at high speed, and preventing the car from losing control due to the violent swing of the wheels.

[0003] When the car is reversing, the car's steering system controls the locking cylinder to lock the wheels, thereby ensuring that the car travels in a straight line and avoiding the uncertainty of the driving direction when the car is reversing.

[0004] For example, Chinese patent application number 2009201413862 discloses a follow-up steering axle assembly, in which the pneumatically controlled locking cylinder assembly is mainly composed of a cylinder body, a piston assembly, a sealing device installed at the end of the cylinder body, a return spring located outside the piston assembly, a push rod located inside the piston assembly and fixedly connected to the piston assembly, a vehicle speed sensor and a pneumatic control system. The air intake pipe of the pneumatic control system is connected to the air intake hole of the cylinder body.

[0005] In the above patent, when the locking cylinder locks the follower bridge, the piston assembly moves forward (towards the outside of the cylinder body), but the contact area between the piston assembly and the front end of the cylinder body is small. When the front end of the push rod is subjected to a large force, the piston assembly is easily unstable in connection with the cylinder body, and the thrust output by the push rod is unstable. Summary of the Invention

[0006] In response to the shortcomings of the existing technology, the present invention provides a guide cylinder, which makes the piston rod of the push rod disk assembly more stable when moving, and extends the guide cylinder out of the mounting surface to the front of it, making it closer to the point of force application on the connecting fork, further enhancing stability.

[0007] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a locking cylinder for a trolley axle of an automobile, comprising a front cover, a rear cover, a push rod plate assembly and a connecting fork, a membrane being provided between the front cover and the rear cover, a reset spring being provided between the membrane and the front cover, a guide cylinder being provided on the front cover, the front side of the front cover being a mounting surface, the reset spring being resting on the inner plane of the mounting surface, the push rod plate assembly comprising a piston rod and a push rod, the guide cylinder being sleeved on the piston rod, and the piston rod and the guide cylinder being slidably connected.

[0008] Furthermore, a plurality of supporting guide rings are arranged in the guide cylinder.

[0009] Furthermore, the guide tube passes through the installation surface of the front cover.

[0010] Furthermore, the front end of the push rod extends out of the piston rod, and a connecting fork is installed at the front end of the push rod. The connecting fork is detachably connected to the front end of the push rod, and a dust cover is provided between the connecting fork and the piston rod.

[0011] Furthermore, the front end of the push rod is provided with an external thread, the connecting fork is cylindrical and provided with an internal thread towards one end of the push rod, and a locking nut is also provided at the front end of the push rod, and the connecting fork is threadedly connected to the push rod.

[0012] Furthermore, connecting bolts and connecting nuts are provided on the mounting surface of the front cover.

[0013] Furthermore, the return spring is a tower spring.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The locking cylinder is connected to the axle through the connecting bolts and nuts on the front cover. The structural dimensions of the front cover are the same as those of the single brake chamber of the vehicle, which simplifies the structure of the connection between the tag axle and the locking cylinder.

[0016] 2. The push rod disc assembly with guide cylinder can make the output thrust more stable;

[0017] 3. The guide cylinder protrudes in front of the mounting surface, making the force application point on the guide cylinder and the connecting fork closer, making the force application more efficient;

[0018] 4. The connecting fork and the push rod in the present invention are detachable, which can make the connection between the connecting fork and the pin simple and convenient, and eliminate the defect of the traditional integrated connecting fork and push rod causing the pin to get stuck during locking due to the manufacturing and installation accuracy, and the locking action is light and fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the locking cylinder of the tag axle of the automobile according to the present invention;

[0020] Figure 2It is a cross-sectional view of the locking cylinder of the tag axle of the automobile of the present invention;

[0021] Figure 3 Schematic diagram of the cooperation between the front cover and the guide cylinder in the present invention;

[0022] Figure 4 Schematic diagram of the cooperation between the push rod and the connecting fork in the present invention.

[0023] Figure markings: 1. Front cover; 11. Connecting nut; 12. Connecting bolt; 13. Mounting surface; 2. Rear cover; 3. Guide cylinder; 31. Outer guide cylinder; 32. Inner guide cylinder; 33. Support guide ring; 4. Dust cover; 5. Connecting fork; 51. Pin; 6. Push rod plate assembly; 61. Push rod; 62. Piston rod; 63. Locking nut; 7. Membrane. DETAILED DESCRIPTION

[0024] Reference Figures 1 to 4 The embodiment of the locking cylinder of the tag axle of an automobile of the present invention is further described.

[0025] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions and positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. Throughout the description of the present invention, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0027] A locking cylinder for a trolley bridge of an automobile comprises a front cover 1, a rear cover 2, a push rod plate assembly 6 and a connecting fork 5. A membrane 7 is provided between the front cover 1 and the rear cover 2. A return spring is provided between the membrane 7 and the front cover 1. A guide cylinder 3 is provided on the front cover 1. The front side of the front cover 1 is a mounting surface 13. The return spring rests on the inner plane of the mounting surface 13. The push rod plate assembly 6 comprises a piston rod 62 and a push rod 61. The guide cylinder 3 is sleeved on the piston rod 62. The piston rod 62 and the guide cylinder 3 are slidably connected.

[0028] The push rod disk assembly 6 further includes a push rod 61 disk, which is mounted on the end of the piston rod 62 and is located between the piston rod 62 and the membrane 7 to increase the contact area with the membrane 7 .

[0029] like Figure 1 and 2 As shown, in this embodiment, the guide cylinder 3 passes through the mounting surface 13 of the front cover 1 , and the guide cylinder 3 and the mounting surface 13 of the front cover 1 are fixed by welding or fixedly connected by a flange.

[0030] In this embodiment, one end of the connecting fork 5 on the locking cylinder is the front end, and one end of the rear cover 2 is the rear end, wherein a portion of the guide cylinder 3 extends from the mounting surface 13 to the front end, and a portion extends from the mounting surface 13 to the rear end, that is, a portion of the guide cylinder 3 is located on the outside to form an outer guide cylinder 31, and a portion is located on the inside to form an inner guide cylinder 31, and the length of the outer guide cylinder 31 is greater than the length of the inner guide cylinder 31. When locking is not performed, the front end of the piston rod 62 is almost flush with the front end of the guide cylinder 3, that is, the front end of the guide cylinder 3 is as close as possible to the point of application of the force on the connecting fork 5.

[0031] In this embodiment, the outer diameter of the outer guide cylinder 31 is preferably larger than the outer diameter of the inner guide cylinder 31, and a mounting hole is provided on the mounting surface 13 of the front cover 1, and the diameter of the mounting hole is equal to the outer diameter of the inner guide cylinder 31. In this way, during installation, the end face of the connection between the outer guide cylinder 31 and the inner guide cylinder 31 can be clamped on the mounting surface 13 to ensure the perpendicularity of the guide cylinder 3 and the mounting surface 13, so that quick positioning and installation can be achieved.

[0032] In this embodiment, the guide cylinder 3 is preferably provided with a plurality of support guide rings 33 , wherein sliding friction is generated between the support guide rings 33 and the piston rod 62 to achieve a good support and guiding effect, and the support guide rings 33 can be made of engineering plastics or copper rings.

[0033] In this embodiment, the reset spring is preferably a tower spring, which is sleeved on the portion of the guide cylinder 3 extending toward the rear end of the mounting surface 13 , and the end face of the tower spring abuts against the mounting surface 13 .

[0034] In this embodiment, the push rod 61 is installed in the piston rod 62, which is the same as the prior art.

[0035] Preferably, the front end of the push rod 61 extends out of the piston rod 62 , and the connecting fork 5 is installed at the front end of the push rod 61 . The connecting fork 5 and the front end of the push rod 61 are detachably connected, and a dust cover 4 is provided between the connecting fork 5 and the piston rod 62 .

[0036] Specifically, the front end of the push rod 61 is provided with an external thread, and the end of the connecting fork 5 facing the push rod 61 is cylindrical and provided with an internal thread. A locking nut 63 is also provided at the front end of the push rod 61, and the connecting fork 5 is threadedly connected to the push rod 61. During assembly, first screw the locking nut 63 into the front end of the push rod 61, and then screw the front end of the push rod 61 into the connecting fork 5, and adjust it to the appropriate angle of the connecting fork 5 (so that the angle of the pin 51 at the front end of the connecting fork 5 is appropriate), and then tighten the locking nut 63 toward the connecting fork 5 to lock the connecting fork 5 here.

[0037] In this embodiment, a connecting bolt 12 and a connecting nut 11 are provided on the mounting surface 13 of the front cover 1, which are used to connect the locking cylinder to the axle. In this embodiment, the structural dimensions of the connecting bolt 12 and the connecting nut 11 are the same as those of the automobile brake single chamber, so that the structure of the connection part between the follower axle and the locking cylinder is simplified.

[0038] In the present invention, a locking ring is preferably provided between the front cover 1 and the rear cover 2 , and the locking ring connects and fixes the front cover 1 and the rear cover 2 by rolling rivets, making the connection more reliable.

[0039] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A locking cylinder for a tag axle of an automobile, comprising a front cover, a rear cover, a push rod plate assembly, and a connecting fork, a membrane between the front cover and the rear cover, and a return spring between the membrane and the front cover, characterized in that: The front cover is provided with a guide cylinder, the front side of the front cover is a mounting surface, the return spring is against the inner plane of the mounting surface, the push rod disc assembly includes a piston rod and a push rod, the guide cylinder is sleeved on the piston rod, and the piston rod and the guide cylinder are slidably connected; One end of the connecting fork on the locking cylinder is the front end, and one end of the rear cover is the rear end, wherein a portion of the guide cylinder extends from the mounting surface toward the front end, and a portion extends from the mounting surface toward the rear end, a portion of the guide cylinder is located on the outside to form an outer guide cylinder, and a portion is located on the inside to form an inner guide cylinder, and the length of the outer guide cylinder is greater than the length of the inner guide cylinder, so that the front end of the guide cylinder is close to the point of application of the force on the connecting fork; The outer diameter of the outer guide cylinder is greater than the outer diameter of the inner guide cylinder, and a mounting hole is provided on the mounting surface of the front cover, and the diameter of the mounting hole is equal to the outer diameter of the inner guide cylinder; The front end of the push rod is provided with an external thread, the end of the connecting fork facing the push rod is cylindrical and provided with an internal thread, and a locking nut is also provided at the front end of the push rod, and the connecting fork is threadedly connected to the push rod.

2. The vehicle tag axle locking cylinder according to claim 1, characterized in that: A plurality of supporting guide rings are arranged in the guide cylinder.

3. The vehicle tag axle locking cylinder according to claim 2, characterized in that: The guide cylinder passes through the installation surface of the front cover.

4. The vehicle tag axle locking cylinder according to claim 3, characterized in that: The front end of the push rod extends out of the piston rod, the connecting fork is installed on the front end of the push rod, the connecting fork and the front end of the push rod are detachably connected, and a dust cover is provided between the connecting fork and the piston rod.

5. The vehicle tag axle locking cylinder according to claim 1, characterized in that: Connecting bolts and connecting nuts are provided on the mounting surface of the front cover.

6. The vehicle tag axle locking cylinder according to claim 1, characterized in that: The return spring is a tower spring.

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