A pulling tool

Abstract

The present application discloses a pull-out tool, comprising: a base, a fixture, and a pull-out mechanism; the fixture comprises a support front plate and a support rear plate; the support front plate and the support rear plate are fixedly connected; the support front plate and the support rear plate are both fixed to the upper surface of the base; the pull-out mechanism comprises a power unit, a pressure sensor, and a fixed puller; the power unit is mounted in the middle of the support front plate, the piston rod of the power unit is located between the support front plate and the support rear plate, the pressure sensor is mounted on the piston rod, and the pressure sensor is used to sense the extrusion force of the piston rod of the power unit pressing against the camshaft; the fixed puller is mounted in the middle of the support rear plate and is used to clamp the timing gear of the fixed camshaft; the support front plate and the support rear plate are parallel to each other and perpendicular to the upper surface of the base. When the camshaft is pulled out, the vertical section of the camshaft is perpendicular to the plane of the support front plate. This device facilitates testing the pull-out force of the camshaft and the timing gear.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of engine tooling, and in particular to a removal tooling. Background Art

[0002] The camshaft is a component in piston engines. Its function is to control the opening and closing of the valves. It typically rotates at high speeds and must withstand significant torque, placing high demands on camshaft strength and support in its design.

[0003] Since the timing gears and flanges are prone to loosening during engine use, it is necessary to test the pull-out force of the camshaft and timing gear so that designers can adjust relevant parameters. Since the timing gears and flanges are installed together after heating with a large interference fit, testing the pull-out force requires a relatively large force. The existing testing method uses hanging pull-out, which is easily affected by external forces, resulting in inaccurate test results. Summary of the Invention

[0004] An embodiment of the present application provides a pull-out tool to facilitate testing the pull-out force of a camshaft and a timing gear.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pulling tool, comprising: a base, a clamp and a pulling mechanism;

[0007] The fixture includes a supporting front plate and a supporting rear plate;

[0008] The support front plate and the support rear plate are fixedly connected;

[0009] The supporting front plate and the supporting rear plate are both fixed to the upper surface of the base;

[0010] The pulling mechanism includes a power device, a pressure sensor and a fixed pulling piece;

[0011] The power device is installed in the middle of the support front plate, the piston rod of the power device is located between the support front plate and the support rear plate, and the pressure sensor is installed on the piston rod, and the pressure sensor is used to sense the extrusion force of the piston rod of the power device pressing the camshaft;

[0012] The fixing puller is installed in the middle of the supporting rear plate and is used to clamp and fix the timing gear of the camshaft;

[0013] The support front plate and the support rear plate are parallel to each other, and both the support front plate and the support rear plate are perpendicular to the upper surface of the base. When the camshaft is pulled out, the vertical section of the camshaft is perpendicular to the plane where the support front plate is located.

[0014] Optionally, the fixing puller includes two semicircular pullers. When the two semicircular pullers are closed, the vertical cross-section of the fixing puller is a T-shaped structure, the vertical end of the T-shaped structure passes through the support rear plate, and the horizontal end of the T-shaped structure is located on the side of the support rear plate close to the support front plate.

[0015] Optionally, the pressure sensor is electrically connected to the power device.

[0016] Optionally, the power device is a pneumatic cylinder or an oil cylinder.

[0017] Optionally, the support front plate and the support rear plate are fixedly connected by a plurality of connecting rods.

[0018] Optionally, the base includes a platform and a bracket, the platform is fixedly connected to the bracket, and the bracket is arranged below the platform.

[0019] Optionally, a support seat is further included, which is fixed to the base by bolts and is used to support the camshaft.

[0020] Optionally, there are two support bases.

[0021] Optionally, the support seat is a trapezoidal structure, and a bracket is provided on the top of the support seat, and the bracket is used to place the camshaft.

[0022] Optionally, the bracket is arc-shaped.

[0023] In the above technical solution, a pressure sensor is arranged on the pulling-out mechanism of the pulling-out tool. The pressure sensor senses the extrusion force of the piston rod of the power unit pressing on the camshaft. When the flange or signal disc is pulled out from the camshaft, the maximum value is the pulling-out force that the flange or signal disc can withstand. The test result is accurate and not easily affected by external forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 This is a schematic diagram of the overall structure of a stripping tool provided by the present invention;

[0026] Figure 2 This is a top view of a stripping tool provided by the present invention;

[0027] Figure 3It is a side view of a stripping tool provided by the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] The invention provides a pulling-out tool for conveniently testing the pulling-out force of a camshaft and a timing gear.

[0030] Furthermore, the embodiments shown below do not limit the invention described in the claims. Furthermore, all the contents of the configurations shown in the embodiments below are not necessarily required as the solution to the invention described in the claims.

[0031] See also Figures 1 to 3 The pulling-out tool in the embodiment of the present invention includes: a base 100, a clamp 200 and a pulling-out mechanism 300; the clamp 200 includes a supporting front plate 201 and a supporting rear plate 202, the supporting front plate 201 and the supporting rear plate 202 are fixedly connected, and the supporting front plate 201 and the supporting rear plate 202 are both fixed to the upper surface of the base 100; the pulling-out mechanism 300 includes a power device 301, a pressure sensor 302 and a fixed pulling piece 303, the power device 301 is installed in the middle of the supporting front plate 201, and the piston rod of the power device 301 is located at the supporting Between the front plate 201 and the supporting rear plate 202, the pressure sensor 202 is installed on the piston rod, and the pressure sensor 302 is used to sense the extrusion force of the piston rod of the power unit 301 pressing the camshaft; the fixed puller 303 is installed in the middle of the supporting rear plate 202, and is used to clamp the timing gear of the fixed camshaft; the supporting front plate 201 and the supporting rear plate 202 are parallel to each other, and the supporting front plate 201 and the supporting rear plate 202 are both perpendicular to the upper surface of the base 100. When the camshaft is pulled out, the vertical section of the camshaft is perpendicular to the plane where the supporting front plate 201 is located.

[0032] In the extraction tool provided by the present invention, the base 100 is used to provide a support surface for extracting the camshaft, the clamp 200 is used to clamp and fix the camshaft body, and the extraction mechanism 300 is used to extract the camshaft timing gear from the camshaft body. The support front plate 201 and the support rear plate 202 are fixed to the base 100 by bolts. The fixed extraction member 303 is fixed to the middle of the support rear plate 202. Through this fixed extraction member 303, the camshaft body can pass through the support rear plate 202 and fix the camshaft timing gear in the support rear plate 202. The power unit 301 is used to provide power for extracting the camshaft timing gear. The power unit 301 is fixed to the middle of the support front plate 201. The power unit 301 passes through the support front plate 201 so that the piston bolt is located between the support front plate 201 and the support rear plate 202. The pressure sensor 202 is mounted on the piston rod.

[0033] When the pulling-out tool provided by the present invention is used to pull out the timing gear of the camshaft, the end of the camshaft near the flange is passed through the support rear plate 202 so that the flange is located between the support front plate 201 and the support rear plate 202. The piston rod of the power unit 301 is used to squeeze the top of the camshaft near the support front plate 201. At the same time, the pressure sensor 302 senses the squeezing force of the piston rod of the power unit 301 pressing the camshaft. By continuously increasing the squeezing force of the piston rod pressing the camshaft, the timing gear of the camshaft can be pulled out from the main body of the camshaft. At the moment the timing gear is pulled out, the maximum pressure value detected by the pressure sensor 302 is the pulling-out force value between the camshaft and the timing gear, completing the test. When using the pulling-out tool of the present invention, it is only necessary to sense the squeezing force of the piston rod of the power unit 301 pressing the camshaft through the pressure sensor 302. No other tools are required. The test is convenient and the results are accurate.

[0034] See Figure 3 In this embodiment of the present invention, the fixed puller 303 is a two-part structure, comprising two semicircular pullers: a semicircular puller 3031 and a semicircular puller 3032. When the semicircular pullers 3031 and 3032 are closed, they form a closed ring with a receiving cavity within. The fixed puller 303 has a T-shaped vertical cross-section, with the vertical end of the T-shaped structure extending through the support rear plate 202 and the horizontal end of the T-shaped structure located on the side of the support rear plate 202 near the support front plate 201. When the timing gear on the camshaft is clamped in the fixed puller 303, the timing gear nestles in the receiving cavity. When the camshaft timing gear is removed from the camshaft body, the T-shaped structure secures the timing gear, preventing it from shifting with the movement of the camshaft body.

[0035] The pressure sensor 302 is electrically connected to the power unit 301. The pressure sensor 302 of the pull-out mechanism 300 is used to sense whether the extrusion force of the piston rod of the power unit 301 pressing the camshaft has reached the detected pull-out force value between the camshaft and the timing gear. The sensing unit of the pressure sensor 302 is located on the end face of the camshaft close to the piston rod. When the piston rod of the power unit 301 is in an extended state and presses the camshaft, the sensing unit of the pressure sensor 302 senses the extrusion force of the piston rod pressing the camshaft, converts the extrusion force into a standard electrical signal, and outputs a standard measurement result corresponding to the extrusion force. The test process is simple to operate, and the required test results can be directly obtained without the aid of other auxiliary tools, which is convenient for practical application.

[0036] In an embodiment of the present invention, the timing gear of the camshaft is pulled off from the main body of the camshaft by controlling the extension and contraction degree of the piston rod of the power device 301. The power device 301 is a hydraulic cylinder or a hydraulic oil cylinder. The present invention preferably uses a hydraulic oil cylinder to ensure the functional stability of the power device.

[0037] In an embodiment of the present invention, the front support plate 201 and the rear support plate 202 are fixedly connected by a plurality of connecting rods 400. The material of the connecting rods can be a rigid material or other materials that are resistant to stretching and deformation, and this application does not specifically limit this. The fixed connection between the front support plate 201 and the rear support plate 202 via the connecting rods 400 can make the structure between the front support plate 201 and the rear support plate 202 more stable, and maintain the parallel distance between the front support plate 201 and the rear support plate 202 unchanged.

[0038] In this embodiment of the present invention, base 100 comprises a platform 101 and a bracket 102. The shape of platform 101 is not limited to a rectangle; it can be designed in other shapes, as long as it provides a support surface for removing the camshaft. Beneath platform 101 is bracket 102, which consists of several supporting legs. Rollers can be mounted on the ground-contacting ends of the legs to facilitate movement of the entire device.

[0039] In an embodiment of the present invention, the pulling tool also includes a support seat 500, which is fixed to the upper surface of the base 100 by bolts and is used to support the camshaft. In order to improve the supporting force of the camshaft, two support seats can be set. The overall structure of the support seat can be designed as a trapezoidal structure. A drag groove 501 is provided at the top of the support seat for convenient placement of the camshaft. The shape of the bracket 501 can be an arc or a V-shape, as long as it is a concave groove that can accommodate the camshaft body. In the embodiment of the present application, an arc shape is preferred, which is consistent with the shape of the camshaft body.

[0040] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

[0041] In this application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only used to illustrate the relative position relationship between the various components or components, and do not particularly limit the specific installation orientation of the various components or components.

[0042] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to indicate a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0043] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0044] In addition, the structures, proportions, sizes, etc. drawn in the drawings in this application are only used to match the contents disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the restrictive conditions that can be implemented in this application. Therefore, they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the efficacy and purpose that can be achieved by this application.

Claims

1. A pulling tool, characterized in that: include: Base, clamp and extraction mechanism; The fixture includes a supporting front plate and a supporting rear plate; The support front plate and the support rear plate are fixedly connected; The supporting front plate and the supporting rear plate are both fixed to the upper surface of the base; The pulling mechanism includes a power device, a pressure sensor and a fixed pulling piece; The power device is installed in the middle of the support front plate, the piston rod of the power device is located between the support front plate and the support rear plate, and the pressure sensor is installed on the piston rod, and the pressure sensor is used to sense the extrusion force of the piston rod of the power device pressing the camshaft; The fixing puller is installed in the middle of the supporting rear plate and is used to clamp and fix the timing gear of the camshaft; The fixing puller includes two semicircular pullers. When the two semicircular pullers are closed, the vertical cross-section of the fixing puller is a T-shaped structure. The vertical end of the T-shaped structure passes through the support rear plate, and the horizontal end of the T-shaped structure is located on the side of the support rear plate close to the support front plate. The support front plate and the support rear plate are parallel to each other, and both the support front plate and the support rear plate are perpendicular to the upper surface of the base. When the camshaft is pulled out, the vertical section of the camshaft is perpendicular to the plane where the support front plate is located; When the pulling-out tool is used to pull out the timing gear of the camshaft, one end of the camshaft flange close to the engine is passed through the support rear plate so that the flange is located between the support front plate and the support rear plate, and the top end of the camshaft close to the support front plate is squeezed by the piston rod of the power unit, and at the same time, the pressure sensor senses the squeezing force of the piston rod of the power unit pressing on the camshaft; by continuously increasing the squeezing force of the piston rod of the power unit pressing on the camshaft, the timing gear of the camshaft can be pulled out from the main body of the camshaft, and at the moment when the timing gear of the camshaft is pulled out, the maximum pressure value detected by the pressure sensor is the pulling-out force value between the camshaft and the timing gear, and the test is completed; when the timing gear of the camshaft is pulled out from the main body of the camshaft, the timing gear of the camshaft is fixed by the T-shaped structure to prevent the timing gear of the camshaft from being displaced as the main body of the camshaft moves.

2. The pulling tool according to claim 1, characterized in that: The pressure sensor is electrically connected to the power device.

3. The pulling tool according to claim 1, characterized in that: The power device is a gas cylinder or an oil cylinder.

4. The pulling tool according to claim 1, characterized in that: The supporting front plate and the supporting rear plate are fixedly connected via a plurality of connecting rods.

5. The pulling tool according to claim 1, characterized in that: The base includes a platform and a bracket. The platform is fixedly connected to the bracket, and the bracket is arranged below the platform.

6. The stripping tool according to any one of claims 1 to 5, characterized in that: It also includes a support seat, which is fixed on the base through bolts and is used to support the camshaft.

7. The pulling tool according to claim 6, characterized in that: The number of the supporting seats is two.

8. The pulling tool according to claim 7, characterized in that: The support seat is a trapezoidal structure, and a bracket is provided on the top of the support seat, and the bracket is used to place the camshaft.

9. The pulling tool according to claim 8, characterized in that: The bracket is arc-shaped.

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