Hollow piston rod for automobile

Abstract

The utility model discloses a hollow piston rod for an automobile, which relates to the field of piston rods, and comprises a main shaft, a first connecting part and a second connecting part which are coaxially arranged, and the first connecting part and the second connecting part are respectively connected to two opposite ends of the main shaft; the first connecting part extends in the direction away from the main shaft and is used for being connected with an output shaft of a hydraulic cylinder. The second connecting part extends in the direction away from the main shaft and is used for being connected with an automobile. The diameter of the first connecting part is smaller than that of the main shaft, and a first external thread used for being matched with an output shaft of a hydraulic cylinder is arranged on the periphery of the first connecting part. The utility model has the advantage that the piston rod is convenient to connect and limit.

Description

Technical Field

[0001] The utility model relates to the field of piston rods, in particular to a hollow piston rod for automobiles. Background Technique

[0002] The piston rod is a common transmission workpiece. In an automobile, the piston rod is usually used to connect a hydraulic cylinder and an automobile frame to transmit the power of the hydraulic cylinder.

[0003] In the related art, the piston rod is arranged in a cylindrical shape, and a hollow oil cavity is arranged inside it for the flow of hydraulic oil. One end of the piston rod is connected to the output shaft of the hydraulic cylinder, and the other end is connected to a component on the automobile. The piston rod and the output shaft of the hydraulic cylinder are connected by welding, and the connection is complex; it is difficult to perform circumferential limitation on the cylindrical piston rod, and the piston rod of the hydraulic cylinder is prone to rotation during sliding, affecting the normal use of the hydraulic cylinder. Summary of the Invention

[0004] In order to solve the defects of inconvenient connection and difficult circumferential limitation of the piston rod in the prior art, the utility model provides a hollow piston rod for automobiles.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] The utility model provides a hollow piston rod for automobiles, which includes a main shaft, a first connection part and a second connection part arranged coaxially. The first connection part and the second connection part are respectively connected to opposite ends of the main shaft; the first connection part extends in a direction away from the main shaft, and the first connection part is used for connecting the output shaft of the hydraulic cylinder; the second connection part extends in a direction away from the main shaft, and the second connection part is used for connecting with the automobile; the diameter of the first connection part is smaller than the diameter of the main shaft, and a first external thread for cooperating with the output shaft of the hydraulic cylinder is arranged on the outer periphery of the first connection part.

[0007] Further, the first connection part is cylindrical, and the ratio of the diameter of the first connection part to the diameter of the main shaft is 1:3 - 1:5.

[0008] Further, the first external thread is arranged on the outer periphery of the end of the first connection part away from the main shaft, and the length of the first external thread extending along the axial direction of the first connection part accounts for 1 / 3 - 1 / 2 of the length of the first connection part.

[0009] Further, a second external thread is arranged on the second connection part.

[0010] Further, the second connecting portion includes an extension shaft section and a connecting shaft section. The extension shaft section is connected to the main shaft. The connecting shaft section is connected to one end of the extension shaft section away from the main shaft. The diameter of the connecting shaft section is smaller than that of the extension shaft section. The second external thread is provided on the circumferential side of the connecting shaft section.

[0011] Further, the second connecting portion further includes a positioning shaft section. The diameter of the positioning shaft section is smaller than that of the connecting shaft section. The positioning shaft section is connected to one end of the connecting shaft section away from the extension shaft section.

[0012] Further, a rotation-preventing plane is formed by cutting on the circumferential side of the extension shaft section. The rotation-preventing plane extends parallel to the axial direction of the extension shaft section.

[0013] Further, two rotation-preventing planes are provided on the outer periphery of the extension shaft section. The two rotation-preventing planes are arranged in parallel on the opposite sides of the extension shaft section.

[0014] Further, a limiting ring groove is provided on the circumferential side of the main shaft. The limiting ring groove extends annularly along the circumferential side of the main shaft.

[0015] Further, a chamfer is provided at the edge of the end of the main shaft.

[0016] In summary, the present utility model has the following beneficial effects:

[0017] 1. In the present utility model, the first connecting portion and the second connecting portion at both ends of the main shaft are respectively used to connect the output shaft of the vehicle hydraulic cylinder and the vehicle. The first connecting portion, the second connecting portion and the main shaft are coaxially arranged, ensuring that the force can be stably transmitted axially along the output shaft of the hydraulic cylinder when it slides. The diameter of the first connecting portion is smaller than that of the main shaft, so as to form a step at the connection between the main shaft and the first connecting portion, so as to play a limiting role when the first connecting portion is inserted into the output shaft of the hydraulic cylinder; the first external thread is provided on the outer periphery of the first connecting portion, so that the output shaft of the hydraulic cylinder can be provided with an internal thread that matches it, and the connection between the piston rod and the output shaft of the hydraulic cylinder is realized by means of threaded connection, which is convenient for the disassembly and assembly of the piston rod and the output shaft of the hydraulic cylinder.

[0018] 2. The first connecting portion is cylindrical, which is convenient for turning and forming, and at the same time is convenient for opening the first external thread on the first connecting portion; the ratio of the diameter of the first connecting portion to that of the main shaft is in the range of 1:3 - 1:5, so as to ensure the connection strength between the main shaft and the output shaft of the hydraulic cylinder while reducing the diameter of the first connecting portion. Furthermore, the diameter of the hole on the output shaft of the hydraulic cylinder that matches the first connecting portion can be correspondingly reduced, reducing the requirement for the diameter size of the output shaft of the hydraulic cylinder.

[0019] 3. An external thread is provided on the second connecting portion to cooperate with the internal thread provided on the vehicle, which is convenient for the connection between the piston rod and the vehicle.

[0020] 4. A rotation - stopping plane is provided on the extension section to facilitate the attachment of structures such as grooves and blocks on the vehicle to the rotation - stopping plane, thereby restricting the rotation of the piston rod and the output shaft of the hydraulic cylinder and ensuring the normal operation of the hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a three - dimensional structural schematic diagram of a hollow piston rod for a vehicle according to an embodiment of the present invention.

[0022] Figure 2 is a structural schematic diagram of the end face of the hollow piston rod for a vehicle according to an embodiment of the present invention, viewed in the front direction of the second connection part.

[0023] Figure 3 is Figure 2 a schematic cross - sectional structure diagram at A - A in

[0024] In the figure:

[0025] 1000, hollow piston rod for a vehicle; 100, main shaft; 110, limiting ring groove; 120, chamfer; 200, first connection part; 210, first external thread; 300, second connection part; 310, extension section; 311, rotation - stopping plane; 320, connecting shaft section; 321, second external thread; 330, positioning shaft section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] This embodiment discloses a hollow piston rod 1000 for a vehicle. Referring to Figure 1 , the hollow piston rod 1000 for a vehicle includes a main shaft 100, a first connection part 200, and a second connection part 300. The first connection part 200, the main shaft 100, and the second connection part 300 are coaxially connected in sequence. The first connection part 200 is connected to the first end of the main shaft 100, and the second connection part 300 is connected to the second end of the main shaft 100. The first connection part 200 extends in a direction away from the main shaft 100 for connecting to the output shaft of the hydraulic cylinder. The second connection part 300 extends in a direction away from the main shaft 100 for connecting to the vehicle.

[0028] In this embodiment, the first connection part 200, the main shaft 100, and the second connection part 300 are integrally cast to enhance the overall strength of the hollow piston rod 1000 for a vehicle. Along the central axis of the hollow piston rod 1000 for a vehicle, cavities that communicate with each other are provided inside the first connection part 200, the main shaft 100, and the second connection part 300 to facilitate the flow of hydraulic oil.

[0029] In this embodiment, the first connecting portion 200 is cylindrical to facilitate turning forming. The output shaft of the hydraulic cylinder is hollow to allow the flow of hydraulic oil, and the first connecting portion 200 can be inserted into the hollow inner cavity of the output shaft of the hydraulic cylinder to connect therewith.

[0030] The diameter of the first connecting portion 200 is smaller than the diameter of the main shaft 100, so as to form a step at the connection between the main shaft 100 and the first connecting portion 200, so as to play a limiting role when the first connecting portion 200 is inserted into the output shaft of the hydraulic cylinder.

[0031] In this embodiment, a first external thread 210 for cooperating with the output shaft of the hydraulic cylinder is provided on the outer periphery of the first connecting portion 200. The inner cavity of the output shaft of the hydraulic cylinder can be provided with an internal thread for cooperating therewith. The connection between the piston rod and the output shaft of the hydraulic cylinder is realized by means of threaded connection, without welding, saving welding cost, and at the same time facilitating the disassembly and assembly of the piston rod and the output shaft of the hydraulic cylinder. The cylindrical first connecting portion 200 also facilitates the turning and milling forming of the first external thread 210, and the processing cost is relatively low.

[0032] In this embodiment, the ratio of the diameter of the first connecting portion 200 to the diameter of the main shaft 100 is 1:3 - 1:5, so as to ensure the connection strength between the main shaft 100 and the output shaft of the hydraulic cylinder while reducing the diameter of the first connecting portion 200. Furthermore, the diameter of the hole on the output shaft of the hydraulic cylinder that cooperates with the first connecting portion 200 can be correspondingly reduced, reducing the requirement for the diameter size of the output shaft of the hydraulic cylinder.

[0033] In this embodiment, the first external thread 210 is only provided on the outer periphery of one end of the first connecting portion 200 away from the main shaft 100, and no external thread is provided on the outer periphery of the portion of the first connecting portion 200 close to the main shaft 100.

[0034] Specifically, the length of the first external thread 210 extending along the axial direction of the first connecting portion 200 accounts for 1 / 3 - 1 / 2 of the length of the first connecting portion 200, so as to reduce the amount of thread processing while meeting the connection requirements between the piston rod and the output shaft of the hydraulic cylinder.

[0035] Refer to Figures 1 to 3 , a limiting ring groove 110 is provided on the circumferential side of the main shaft 100. The limiting ring groove 110 extends annularly along the circumferential side of the main shaft 100, that is, the limiting ring groove 110 is coaxial with the main shaft 100. Thus, the setting of the limiting ring groove 110 makes there be a force application point on the outer peripheral surface of the cylindrical main shaft 100, so as to facilitate the movement and installation of the hollow piston rod for the vehicle.

[0036] In this embodiment, a chamfer 120 is provided at the edge of the end of the main shaft 100. Specifically, a circle of chamfers 120 are provided at the edges of both ends of the main shaft 100 to prevent the edges from being damaged due to stress concentration during the handling and installation of the main shaft 100.

[0037] Referring to Figures 1 to 3 , the second connecting portion 300 includes an extended shaft segment and a connecting shaft segment 320. The extended shaft segment and the connecting shaft segment 320 are coaxially arranged. The extended shaft segment is connected to the end of the main shaft 100, and the connecting shaft segment 320 is connected to one end of the extended shaft segment away from the main shaft 100.

[0038] A second external thread 321 is provided on the circumferential side of the connecting shaft segment 320 to cooperate with the internal thread provided on the vehicle, so as to facilitate the connection with the vehicle. In this embodiment, the diameter of the connecting shaft segment 320 is smaller than the diameter of the extended shaft segment, so that a step is formed at the connection between the connecting shaft segment 320 and the extended shaft segment to limit the position when the connecting shaft segment 320 cooperates with the threaded hole on the vehicle.

[0039] Preferably, the second connecting portion 300 further includes a positioning shaft segment 330. The diameter of the positioning shaft segment 330 is smaller than the diameter of the connecting shaft segment 320. The positioning shaft segment 330 is connected to one end of the connecting shaft segment 320 away from the extended shaft segment. Correspondingly, a positioning hole that cooperates with the positioning shaft segment 330 can be provided on the vehicle, so as to play a positioning role when the hollow piston rod 1000 for vehicle is connected to the vehicle through the cooperation of the positioning shaft segment 330 and the positioning hole.

[0040] A rotation-preventing plane 311 is formed by cutting on the circumferential side of the extended shaft segment. The rotation-preventing plane 311 extends parallel to the axial direction of the extended shaft segment. The rotation-preventing plane 311 is provided on the extended segment 310 to facilitate the setting of structures such as grooves and blocks on the vehicle to fit against the rotation-preventing plane 311, thereby restricting the rotation of the piston rod and the output shaft of the hydraulic cylinder and ensuring the normal operation of the hydraulic cylinder.

[0041] Specifically in this embodiment, two rotation-preventing planes 311 are provided on the outer circumference of the extended shaft segment. The two rotation-preventing planes 311 are parallel and arranged on the opposite sides of the extended shaft segment. Two bumps can be provided on the vehicle on the opposite sides of the extended shaft segment. The two bumps are respectively fitted against the two rotation-preventing planes 311 to restrict the circumferential rotation of the hollow piston rod 1000 for vehicle.

[0042] The above is only the preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A hollow piston rod for an automobile, characterized in that, It includes a main shaft (100), a first connecting part (200) and a second connecting part (300) which are coaxially arranged. The first connecting part (200) and the second connecting part (300) are respectively connected to opposite ends of the main shaft (100). The first connecting part (200) extends in a direction away from the main shaft (100) and is used for connecting the output shaft of a hydraulic cylinder. The second connecting part (300) extends in a direction away from the main shaft (100) and is used for connecting to an automobile. The diameter of the first connecting part (200) is smaller than that of the main shaft (100), and a first external thread (210) for cooperating with the output shaft of the hydraulic cylinder is provided on the outer periphery of the first connecting part (200).

2. The hollow piston rod for an automobile according to claim 1, wherein The first connecting part (200) is cylindrical, and the ratio of the diameter of the first connecting part (200) to the diameter of the main shaft (100) is 1:3 - 1:

5.

3. The hollow piston rod for an automobile according to claim 2, wherein The first external thread (210) is provided on the outer periphery of the end of the first connecting part (200) away from the main shaft (100), and the length of the first external thread (210) extending along the axial direction of the first connecting part (200) accounts for 1 / 3 - 1 / 2 of the length of the first connecting part (200).

4. The hollow piston rod for an automobile according to claim 1, wherein, A second external thread (321) is provided on the second connecting part (300).

5. The hollow piston rod for an automobile according to claim 4, characterized in that, The second connecting part (300) includes an extension shaft segment and a connecting shaft segment (320). The extension shaft segment is connected to the main shaft (100), and the connecting shaft segment (320) is connected to the end of the extension shaft segment away from the main shaft (100). The diameter of the connecting shaft segment (320) is smaller than that of the extension shaft segment, and the second external thread (321) is provided on the circumferential side of the connecting shaft segment (320).

6. The hollow piston rod for an automobile according to claim 5, characterized in that, The second connecting part (300) further includes a positioning shaft segment (330). The diameter of the positioning shaft segment (330) is smaller than that of the connecting shaft segment (320), and the positioning shaft segment (330) is connected to the end of the connecting shaft segment (320) away from the extension shaft segment.

7. The hollow piston rod for an automobile according to claim 5, characterized in that, A rotation - stopping plane (311) is formed by cutting on the circumferential side of the extension shaft segment, and the rotation - stopping plane (311) extends parallel to the axial direction of the extension shaft segment.

8. The hollow piston rod for an automobile according to claim 7, wherein There are two rotation - stopping planes (311) provided on the outer periphery of the extension shaft segment, and the two rotation - stopping planes (311) are parallel and arranged on opposite sides of the extension shaft segment.

9. The hollow piston rod for an automobile according to claim 1, wherein, A limiting ring groove (110) is provided on the circumferential side of the main shaft (100), and the limiting ring groove (110) extends annularly along the circumferential side of the main shaft (100).

10. A hollow piston rod for an automobile as described in claim 1, characterized in that, A chamfer (120) is provided at the edge of the end of the main shaft (100).

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