Crankshaft machining tool
The crankshaft machining fixture, which uses concave arc jaws and worm gear transmission, solves the crankshaft damage problem caused by line contact in traditional three-jaw chucks, achieves surface contact pressure reduction and convenient clamping, and improves machining quality and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-04-03
AI Technical Summary
When a traditional three-jaw chuck clamps a crankshaft, the line contact results in excessive contact pressure per unit area, which can easily cause indentations, scratches, or deformation on the shaft diameter surface, affecting machining quality and precision.
The design of the chuck with a concave arc end face is converted to surface contact. Through the cooperation of rectangular groove and connecting rod, the trapezoidal pull plate drives the chuck to retract and clamp. Combined with worm gear transmission, it realizes convenient clamping and releasing.
This reduces the risk of crankshaft damage during clamping, ensures machining quality and precision, and improves clamping efficiency and ease of operation.
Smart Images
Figure CN224074212U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of crankshaft tooling technology, and in particular to a crankshaft machining tooling. Background Technology
[0002] The crankshaft is a key component of the engine. Its working principle is to convert the reciprocating motion of the piston into its own rotational motion through the connecting rod. Its main functions are to output power to the engine, balance vibration and inertial forces, and drive engine accessories.
[0003] To ensure the stability of the crankshaft during machining, a three-jaw chuck is required to clamp it.
[0004] However, when a traditional three-jaw chuck clamps a workpiece, the jaws and the workpiece are in line contact, which results in excessive contact pressure per unit area.
[0005] When it comes to crankshaft repair, such problems become a serious obstacle. Crankshaft repair usually requires secondary processing while preserving the original shaft diameter accuracy and surface quality. Excessive contact pressure can easily cause indentations, scratches, or even deformation on the shaft diameter surface, which not only damages the original structural strength of the crankshaft but also makes the repaired crankshaft unable to meet the design accuracy requirements. Utility Model Content
[0006] The purpose of this invention is to provide a crankshaft machining fixture, which solves the above-mentioned problems when used in operation.
[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a crankshaft machining fixture, comprising a crankshaft body and a fixture base, wherein the upper and lower ends of the crankshaft body are provided with fixture components, the fixture components include fixture bases disposed at the upper and lower ends of the crankshaft body, a fixture plate is installed at the end of the fixture base, a clamping component is disposed at the end of the fixture plate, a driving component is disposed inside the fixture base, and an internal support is fixed inside the fixture base.
[0008] Preferably, the end face of the chuck facing the crankshaft body shaft is a concave arc end face, and the diameter of the concave arc end face of the chuck is consistent with the shaft diameter of the crankshaft body.
[0009] Preferably, the clamping assembly includes four rectangular slots equally spaced inside the tooling tray. A connecting rod is provided inside the rectangular slot. A pawl is fixed to the top of the connecting rod and is located at the top of the tooling tray. A connecting block is hinged to the bottom of the connecting rod inside the tooling base. A support seat is hinged to the bottom of the connecting block and is fixed to the top of the built-in support.
[0010] Preferably, the inclination angle of the rectangular groove is °, the size of the connecting rod matches the size of the rectangular groove, and the connecting rod can move within the rectangular groove.
[0011] Preferably, the drive assembly includes a main shaft rotatably disposed in the middle position inside the tooling base, the main shaft being placed in the middle position inside the built-in support, a trapezoidal pull plate being fixed to the top of the main shaft protruding from the built-in support, a worm gear being fixed to the bottom of the main shaft, the worm gear being located below the built-in support, a worm engaging on one side of the worm gear, and rotating rods being fixed to both sides of the worm gear, the rotating rods protruding from both sides of one end of the tooling base.
[0012] Preferably, the trapezoidal pull plate and the bottom of the connecting rod are located on the same plane, and the trapezoidal pull plate can push the bottom of the connecting rod outward.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0014] This utility model provides a crankshaft machining fixture. By employing a concave arc end face design for the jaws, it optimizes traditional line contact into surface contact, significantly reducing contact pressure and effectively avoiding the risk of damage to the crankshaft body during clamping, thus ensuring the quality of crankshaft machining. The rectangular groove is set at a 15° inclination angle, combined with the flexible up-and-down movement of the connecting rod within the groove. When the trapezoidal pull plate rotates, it drives the connecting rod to move downwards along the groove, thereby achieving synchronous retraction of the four jaws, reliably clamping the two ends of the crankshaft body and ensuring workpiece stability during machining. Through the linkage transmission structure of the rotating rod, worm gear, worm wheel, main shaft, and trapezoidal pull plate, the fixture components can conveniently clamp and release the crankshaft body. Forward rotation of the rotating rod drives the various components to work together to complete clamping, while reverse rotation enables rapid release. The operation is simple and efficient, significantly improving the clamping efficiency and operational convenience of crankshaft machining. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the tooling clamping crankshaft structure of this utility model;
[0016] Figure 2 This is a schematic diagram of the tooling structure of this utility model;
[0017] Figure 3 A partial cross-sectional view of the tooling structure of this utility model. Figure 1 ;
[0018] Figure 4 A partial cross-sectional view of the tooling structure of this utility model. Figure 2 ;
[0019] Figure 5 This is a schematic diagram of a partial structure of the tooling of this utility model. Figure 1 ;
[0020] Figure 6 This is a schematic diagram of a partial structure of the tooling of this utility model. Figure 2 ;
[0021] Figure 7This is a schematic diagram of the tooling tray structure of this utility model.
[0022] The reference numerals in the figure are as follows: 1. Crankshaft body; 2. Tooling base; 21. Rotary rod; 22. Worm gear; 23. Main shaft; 24. Worm wheel; 25. Trapezoidal pull plate; 3. Tooling plate; 31. Claw; 32. Connecting rod; 33. Connecting block; 34. Support seat; 35. Rectangular groove; 4. Internal support. Detailed Implementation
[0023] 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.
[0024] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings.
[0025] Combination Figures 1 to 7 As shown, a crankshaft machining fixture of the present invention includes a crankshaft body 1 and a fixture base 2. The upper and lower ends of the crankshaft body 1 are provided with fixture components. The fixture components include fixture bases 2 disposed at the upper and lower ends of the crankshaft body 1. A fixture plate 3 is installed at the end of the fixture base 2. A clamping component is disposed at the end of the fixture plate 3. A drive component is disposed inside the fixture base 2. An internal support 4 is fixed inside the fixture base 2.
[0026] The end face of the pawl 31 facing the crankshaft body 1 is a concave arc end face, and the diameter of the concave arc end face of the pawl 31 is the same as the shaft diameter of the crankshaft body 1.
[0027] The clamping assembly includes four rectangular slots 35 equally spaced inside the tooling tray 3. A connecting rod 32 is provided inside the rectangular slot 35. A claw 31 is fixed to the top of the connecting rod 32. The claw 31 is located at the top of the tooling tray 3. The bottom of the connecting rod 32 extends into the tooling base 2 and is hinged to a connecting block 33. A support seat 34 is hinged to the bottom of the connecting block 33. The support seat 34 is fixed to the top of the built-in support 4.
[0028] The rectangular groove 35 has an inclination angle of 15°, and the dimensions of the connecting rod 32 match the dimensions of the rectangular groove 35, allowing the connecting rod 32 to move within the rectangular groove 35.
[0029] The drive assembly includes a main shaft 23 rotatably disposed in the middle of the tooling base 2. The main shaft 23 is located in the middle of the built-in support 4. A trapezoidal pull plate 25 is fixed to the top of the main shaft 23 protruding from the built-in support 4. A worm gear 24 is fixed to the bottom of the main shaft 23. The worm gear 24 is located below the built-in support 4. A worm 22 is meshed on one side of the worm gear 24. Rotary rods 21 are fixed on both sides of the worm 22. The rotating rods 21 protrude from both sides of one end of the tooling base 2.
[0030] The bottom of the trapezoidal pull plate 25 and the bottom of the connecting rod 32 are on the same plane, and the trapezoidal pull plate 25 can push the bottom of the connecting rod 32 outward.
[0031] Specifically, when the chuck 31 clamps the shafts at both ends of the crankshaft body 1, the concave arc end face of the chuck 31 replaces the line contact with the surface contact, which greatly reduces the contact pressure and lowers the risk of damage to the crankshaft body 1.
[0032] Furthermore, since the inclination angle of the rectangular groove 35 is 15°, the connecting rod 32 can move up and down within the rectangular groove 35. When the trapezoidal pull plate 25 rotates and pushes the bottom of the connecting rod 32 outward, the connecting rod 32 moves down along the rectangular groove 35 under the action of the rectangular groove 35 and pulls down the pawl 31. In this way, the four pawls 31 can be retracted towards the middle position of the tooling plate 3, and the shafts at both ends of the crankshaft body 1 can be clamped by the pawls 31.
[0033] Furthermore, the tooling components are installed on the top and bottom of the crankshaft body 1 respectively. By rotating the rotating rod 21, the worm gear 22 is driven to rotate, which in turn drives the meshing worm wheel 24 to rotate. The worm wheel 24 drives the main shaft 23 to rotate, which in turn drives the trapezoidal pull plate 25 to rotate on the top of the built-in support 4. The rotating trapezoidal pull plate 25 pushes the bottom of the connecting rod 32 outward, causing the connecting rod 32 to move down along the rectangular groove 35, which in turn drives the pawl 31 to retract inward. The retracted pawl 31 tightly clamps the shafts at both ends of the crankshaft body 1. In this way, the tooling components can be used to clamp the crankshaft body 1.
[0034] Similarly, rotating the lever 21 in the opposite direction causes the worm gear 22 to reverse, which in turn causes the worm wheel 24 to reverse. The worm wheel 24 then causes the main shaft 23 and the trapezoidal pull plate 25 to reverse, so that the trapezoidal pull plate 25 stops pushing the bottom of the connecting rod 32, thus completing the loosening of the crankshaft body 1.
[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A crankshaft machining fixture, comprising a crankshaft body (1) and a fixture base (2), characterized in that: Tooling components are provided at both the upper and lower ends of the crankshaft body (1). The tooling components include tooling bases (2) provided at the upper and lower ends of the crankshaft body (1), tooling discs (3) are installed at the ends of the tooling bases (2), clamping components are provided at the ends of the tooling discs (3), driving components are provided inside the tooling bases (2), and built-in supports (4) are fixed inside the tooling bases (2).
2. The crankshaft machining fixture according to claim 1, characterized in that: The end face of the pawl (31) facing the crankshaft body (1) is a concave arc end face, and the diameter of the concave arc end face of the pawl (31) is the same as the shaft diameter of the crankshaft body (1).
3. The crankshaft machining fixture according to claim 2, characterized in that: The clamping assembly includes four rectangular slots (35) equally spaced inside the tooling tray (3). A connecting rod (32) is provided inside the rectangular slot (35). A pawl (31) is fixed to the top of the connecting rod (32). The pawl (31) is located at the top of the tooling tray (3). The bottom of the connecting rod (32) extends into the tooling base (2) and is hinged to a connecting block (33). A support seat (34) is hinged to the bottom of the connecting block (33). The support seat (34) is fixed to the top of the built-in support (4).
4. The crankshaft machining fixture according to claim 3, characterized in that: The rectangular groove (35) has an inclination angle of 15°, and the dimensions of the connecting rod (32) match the dimensions of the rectangular groove (35). The connecting rod (32) can move within the rectangular groove (35).
5. The crankshaft machining fixture according to claim 4, characterized in that: The drive assembly includes a spindle (23) rotatably positioned in the middle of the tooling base (2). The spindle (23) is located in the middle of the built-in support (4). A trapezoidal pull plate (25) is fixed to the top of the spindle (23) protruding from the built-in support (4). A worm gear (24) is fixed to the bottom of the spindle (23). The worm gear (24) is located below the built-in support (4). A worm (22) is meshed on one side of the worm gear (24). Rotary rods (21) are fixed to both sides of the worm (22). The rotating rods (21) protrude from both sides of one end of the tooling base (2).
6. The crankshaft machining fixture according to claim 5, characterized in that: The bottom of the trapezoidal pull plate (25) and the connecting rod (32) are on the same plane, and the trapezoidal pull plate (25) can push the bottom of the connecting rod (32) outward.