Camshaft signal wheel press-fitting mechanism

Abstract

The utility model provides a cam shaft signal wheel press-fitting mechanism, which relates to the field of cam shafts and comprises a fixed frame arranged on a press-fitting platform of a press, and a movable plate capable of sliding left and right is arranged on a bottom plate of the fixed frame. A first positioning assembly used for vertically positioning an air inlet cam shaft and a second positioning assembly used for vertically positioning an exhaust cam shaft are arranged on the movable plate side by side. A top column capable of moving up and down is arranged on a top plate of the fixing frame in a penetrating mode, the upper end of the top column is connected with a pressing head of the pressing machine, the lower end of the top column is connected with a lifting plate, and the lower end of the lifting plate is connected with a pressing block used for pressing a signal wheel at the upper end of an air inlet cam shaft or an exhaust cam shaft. The bottom plate is further provided with a remodeling driving cylinder used for driving the movable plate to slide left and right so as to replace different positioning assemblies to be matched with the pressing blocks. The cam shaft signal wheel press-fitting mechanism can be suitable for signal wheel press-fitting of an air inlet cam shaft and an air outlet cam shaft at the same time, the equipment cost is reduced, and the working efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of camshaft processing, and more specifically, to a press-fitting mechanism for a camshaft signal wheel. Background Art

[0002] A camshaft is an important component in a piston engine, and its function is to control the opening and closing of the valves. Generally, an engine is equipped with one intake camshaft and one exhaust camshaft. Signal wheels need to be assembled at the ends of both the intake camshaft and the exhaust camshaft. Generally, the signal wheels are pressed into the ends of the camshafts by axial press-fitting.

[0003] In the prior art, due to the different structures and assembly requirements of the intake camshaft and the exhaust camshaft, two devices or a single device with a single working station are required to frequently replace the tooling to achieve the assembly of the two products. This press-fitting method has the following deficiencies:

[0004] 1. Low precision and efficiency: Since a single device with a single working station needs to frequently replace the tooling for intake and exhaust switching, the occurrence of unstable press-fitting is caused.

[0005] 2. High investment amount: Since two devices are used for press-fitting the intake and exhaust camshafts, the investment in two devices is required, which will reduce the equipment utilization rate and result in a low cost performance of the equipment.

[0006] Therefore, in the above situation, in order to improve production efficiency, precision, and investment cost performance, a press-fitting mechanism for press-fitting signal wheels that can achieve rapid tool change for intake and exhaust camshafts needs to be designed. Summary of the Utility Model

[0007] To overcome at least one defect in the above prior art, the utility model provides a press-fitting mechanism for a camshaft signal wheel, which can be simultaneously applicable to the press-fitting of signal wheels of intake camshafts and exhaust camshafts, reduce equipment costs, and has high working efficiency.

[0008] The utility model provides a press-fitting mechanism for a camshaft signal wheel: including a fixed frame installed on the press-fitting platform of a press, a movable plate that can slide left and right is arranged on the bottom plate of the fixed frame, and a first positioning component for vertically positioning the intake camshaft and a second positioning component for vertically positioning the exhaust camshaft are arranged side by side on the movable plate; a top column that can move up and down penetrates through the top plate of the fixed frame, the upper end of the top column is connected to the press head of the press, the lower end of the top column is connected to a lifting plate, and the lower end of the lifting plate is connected to a pressing block for press-fitting a signal wheel at the upper end of the intake camshaft or the exhaust camshaft. A tool-changing drive cylinder for driving the movable plate to slide left and right to replace different positioning components and cooperate with the pressing block is also arranged on the bottom plate.

[0009] Compared with the prior art, a camshaft signal wheel pressing mechanism of the present utility model has the following advantages:

[0010] The camshaft signal wheel pressing mechanism of the present utility model is a special equipment, which includes two positioning components and a shared pressing part structure. That is, the two positioning components are used to position the intake camshaft and the exhaust camshaft respectively. During operation, the corresponding positioning component is selected for positioning according to the type of camshaft, and then the signal wheel is pressed through the pressing part. Additionally, a movable plate that can move left and right is provided to switch between the two positioning components. Compared with the traditional structure where two devices are used to press different camshafts, one tooling is saved. Correspondingly, only a changeover positioning component and a switching structure are added, greatly reducing the equipment cost, and there is no need to frequently replace the tooling, improving the work efficiency.

[0011] Furthermore, the first positioning component includes a first U-shaped mounting block. A first positioning seat for the lower end of the intake camshaft to be inserted is connected to the bottom plate of the first U-shaped mounting block. V-shaped clamping blocks are arranged on the inner walls of both side plates of the first U-shaped mounting block, and clamping driving cylinders for driving the V-shaped clamping blocks to move horizontally are provided. The second positioning component includes a second U-shaped mounting block. A second positioning seat for the lower end of the exhaust camshaft to be inserted is connected to the bottom plate of the second U-shaped mounting block. V-shaped clamping blocks are arranged on the inner walls of both side plates of the second U-shaped mounting block, and clamping driving cylinders for driving the V-shaped clamping blocks to move horizontally are provided.

[0012] As an improvement, elastic buffer members are arranged at the tops of both side plates of the first U-shaped mounting block and the second U-shaped mounting block. Two buffer guiding blocks corresponding to the two elastic buffer members respectively are arranged on the lower end surface of the lifting plate.

[0013] As a further improvement, positioning columns are arranged at the front and rear ends of the tops of both side plates of the first U-shaped mounting block and the second U-shaped mounting block. When the lifting plate descends to the limit position, the buffer guiding blocks are in contact with the positioning columns, and each elastic buffer member is located at the middle position between the two positioning columns on the same side plate.

[0014] Preferably, the elastic buffer member is a spring buffer or a hydraulic buffer.

[0015] As a further improvement, a pressure sensor and a sensor pressing block for vertically pressing and limiting the pressure sensor are arranged on the upper end surface of the lifting plate. The lower end of the ejector rod is connected to the upper end of the pressure sensor.

[0016] Further improved, four guide rods distributed in a rectangular shape are connected to the lifting plate. Four guide sliding sleeves respectively slidingly engaged with the guide rods are penetrated through the top plate. The upper ends of the four guide rods are connected with a positioning plate. A support block is arranged on the positioning plate. A vertically arranged slider displacement sensor is arranged on the top plate, and a conductive slider of the slider displacement sensor abuts against the support block.

[0017] Further improved, limit buffer blocks for limiting the left and right sliding strokes of the movable plate are arranged at the left and right ends of the upper end surface of the bottom plate.

[0018] Other improved features and advantages of the present utility model will be described in the following specific embodiments, and part of them will be obvious from the description or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. Brief Description of the Drawings

[0019] Figure 1 It is a three-dimensional structure diagram of the camshaft signal wheel pressing mechanism of the present utility model;

[0020] Figure 2 It is a connection structure diagram of the movable plate, the first positioning assembly and the second positioning assembly in the present utility model;

[0021] Figure 3 It is a structure diagram of the pressing part in the present utility model.

[0022] Description of the Reference Numerals:

[0023] 1. Bottom plate; 2. Movable plate; 3. Top plate; 4. Top column; 5. Lifting plate; 6. Pressing block; 7. Type-changing driving cylinder; 8. First U-shaped mounting block; 9. First positioning seat; 10. V-shaped clamping block; 11. Clamping driving cylinder; 12. Second U-shaped mounting block; 13. Second positioning seat; 14. Elastic buffer member; 15. Buffer guide block; 16. Positioning column; 17. Pressure sensor; 18. Sensor pressing block; 19. Guide rod; 20. Guide sliding sleeve; 21. Positioning plate; 22. Support block; 23. Slider displacement sensor; 24. Conductive slider; 25. Limit buffer block; 26. Linear slide rail; 27. Slider. Detailed Description of the Embodiments

[0024] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments according to needs to adapt to specific application scenarios.

[0025] In the description of the embodiments of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "fixed" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0026] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See Figures 1 to 3 As shown, the embodiments of the present application disclose a camshaft signal wheel press-fitting mechanism, which includes a fixing frame installed on the press-fitting platform of a press. The fixing frame includes a bottom plate 1 and a top plate 3. The bottom plate 1 and the top plate 3 are fixedly connected by four columns, and four support columns are provided at the lower end of the bottom plate 1 for stably supporting the entire fixing frame on the press-fitting platform.

[0028] In addition, a movable plate 2 that can slide left and right is provided on the bottom plate 1. Specifically, linear slide rails 26 extending left and right are provided on both the front and rear sides of the upper end surface of the bottom plate 1. Sliders 27 for slidably connecting to the respective linear slide rails 26 are provided on the lower end surface of the movable plate 2. The structure of the slider 27 and the linear slide rail 26 makes the movable plate 2 move more smoothly left and right and have better linearity. A first positioning component for vertically positioning the intake camshaft and a second positioning component for vertically positioning the exhaust camshaft are installed side by side on the movable plate 2. Specifically, the first positioning component includes a first U-shaped mounting block 8. A first positioning seat 9 for inserting the lower end of the intake camshaft is connected to the bottom plate 1 of the first U-shaped mounting block 8. A dedicated first positioning jack is provided on the first positioning seat 9. V-shaped clamping blocks 10 are provided on the inner walls of both side plates of the first U-shaped mounting block 8, and a clamping driving cylinder 11 for driving the V-shaped clamping blocks 10 to move horizontally is provided. The second positioning component includes a second U-shaped mounting block 12. A second positioning seat 13 for inserting the lower end of the exhaust camshaft is connected to the bottom plate 1 of the second U-shaped mounting block 12. A dedicated second positioning jack is provided on the second positioning seat 13. V-shaped clamping blocks 10 are provided on the inner walls of both side plates of the second U-shaped mounting block 12, and a clamping driving cylinder 11 for driving the V-shaped clamping blocks 10 to move horizontally is provided. Taking the intake camshaft as an example, during positioning, first, its lower end is inserted vertically into the first positioning jack. Then, the two clamping driving cylinders 11 on the inner walls of both side plates of the first U-shaped mounting block 8 act to drive the two V-shaped clamping blocks 10 to move closer to each other and clamp and limit the outer wall of the upper end of the intake camshaft, thereby realizing the stable limitation of the intake camshaft.

[0029] A top column 4 is movably inserted through a top plate 3. The upper end of the top column 4 is connected to the press head of a press, and the lower end of the top column 4 is connected to a lifting plate 5. The lower end of the lifting plate 5 is connected to a pressing block 6 for press-fitting a signal wheel onto the upper end of an intake camshaft or an exhaust camshaft. A die change driving cylinder 7 is further arranged on a bottom plate 1 for driving a movable plate 2 to slide left and right to replace different positioning components to cooperate with the pressing block 6. See the appendix Figure 2 . Moreover, in this structure, limit buffer blocks 25 for limiting the left and right sliding strokes of the movable plate 2 are arranged at both the left and right ends of the upper end surface of the bottom plate 1. That is, when the movable plate 2 moves leftward until it contacts the left limit buffer block 25, the second positioning component just corresponds to the pressing block 6 for press-fitting the signal wheel of the exhaust camshaft; when the movable plate 2 moves rightward until it contacts the right limit buffer block 25, the first positioning component just corresponds to the pressing block 6 for press-fitting the signal wheel of the intake camshaft, ensuring that the two different positioning components can be accurately aligned with the pressing block 6 after switching positions without the need for other alignment methods, thus improving work efficiency.

[0030] Working principle:

[0031] When the intake camshaft or the exhaust camshaft is stably positioned on the corresponding positioning component, it is moved to the corresponding press-fitting station, and a signal wheel is installed on its upper end. The press runs to drive the top column 4 to drive the lifting plate 5 to move downward, and the pressing block 6 moves downward synchronously with it until the pressing block 6 successfully press-fits the signal wheel to the set position. In this structure, it can be applicable to both the intake camshaft and the exhaust camshaft at the same time. Only the positioning component needs to be switched according to different products, and the upper pressing part is shared, without the need for two sets of tooling or two independently configured upper and lower press-fitting stations, which not only saves equipment costs but also improves work efficiency.

[0032] In this embodiment, elastic buffer members 14 are arranged at the tops of the side plates of the first U-shaped mounting block 8 and the second U-shaped mounting block 12, and two buffer guiding blocks 15 corresponding to the two elastic buffer members 14 respectively are arranged on the lower end surface of the lifting plate 5. The elastic buffer structure is provided to prevent the pressing block 6 from quickly contacting the signal wheel during the press-fitting process, resulting in part damage, or the signal wheel being skewed during the press-fitting process, resulting in product rework.

[0033] In addition, positioning columns 16 are arranged at the front and rear ends of the tops of the side plates of the first U-shaped mounting block 8 and the second U-shaped mounting block 12. When the lifting plate 5 moves downward to the limit position, the buffer guiding block 15 abuts against the positioning column 16 to accurately control the press-fitting stroke of the pressing block 6 and ensure the accuracy of the signal wheel press-fitting position; each elastic buffer member 14 is located at the middle position between the two positioning columns 16 on the same side plate, so that the lifting plate 5 can still move downward smoothly after decelerating when contacting the elastic buffer member 14 during the downward movement process.

[0034] In this embodiment, preferably, the elastic buffer 14 is a spring buffer or a hydraulic buffer, which is used to prevent the pressing block 6 from colliding strongly with the signal wheel to be press-fitted during the downward movement of the lifting plate 5, resulting in damage to the parts.

[0035] On the other hand, referring to the attached Figure 1 , in the above structure, a pressure sensor 17 and a sensor pressing block 18 for vertically pressing and limiting the pressure sensor 17 are provided on the upper end surface of the lifting plate 5, and the lower end of the ejector pin 4 is connected to the upper end of the pressure sensor 17. The pressing force is effectively and accurately controlled by the pressure sensor 17 to avoid the position of the signal wheel on the camshaft exceeding the set value due to excessive pressure.

[0036] In this embodiment, referring to the attached Figure 3 , four guide rods 19 distributed in a rectangular shape are connected to the lifting plate 5, and four guide sleeves 20 respectively slidingly matched with the guide rods 19 are arranged on the top plate 3. The upper ends of the four guide rods 19 are connected with a positioning plate 21. The guide structure makes the lifting of the lifting plate 5 more stable without shaking. In addition, a support block 22 is arranged on the positioning plate 21, a slider displacement sensor 23 vertically arranged is arranged on the top plate 3, and the conductive slider 24 of the slider displacement sensor 23 abuts against the support block 22. Specifically, a U-shaped notch is formed in the support block 22, a limiting shaft is provided on the conductive slider 24, and the limiting shaft is inserted and fitted in the notch.

[0037] In the description of the present application, the descriptions referring to the terms "this embodiment", "some embodiments", etc. mean that the specific features, mechanisms, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0038] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in the present application should be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A camshaft signal wheel press-fitting mechanism, characterized in that: The invention comprises a fixed frame installed on a pressing platform of a press machine, wherein a movable plate (2) which can slide left and right is arranged on the bottom plate (1) of the fixed frame, and a first positioning component for vertically positioning an intake camshaft and a second positioning component for vertically positioning an exhaust camshaft are arranged side by side on the movable plate (2); a top column (4) which can move up and down is passed through the top plate (3) of the fixed frame, the upper end of the top column (4) is connected to the pressing head of the press machine, the lower end of the top column (4) is connected to a lifting plate (5), and the lower end of the lifting plate (5) is connected to a pressing block (6) for pressing a signal wheel on the upper end of the intake camshaft or the exhaust camshaft, and the bottom plate (1) is also provided with a change-over drive cylinder (7) for driving the movable plate (2) to slide left and right to replace different positioning components to cooperate with the pressing block (6).

2. The camshaft signal wheel press-fitting mechanism according to claim 1, characterized in that: The first positioning assembly comprises a first U-shaped mounting block (8), a first positioning seat (9) for inserting the lower end of the intake camshaft is connected to the bottom plate (1) of the first U-shaped mounting block (8), and V-shaped clamping blocks (10) and a clamping drive cylinder (11) for driving the V-shaped clamping blocks (10) to move horizontally are arranged on the inner walls of both side plates of the first U-shaped mounting block (8); The second positioning assembly comprises a second U-shaped mounting block (12), a second positioning seat (13) for inserting the lower end of the exhaust camshaft is connected to the bottom plate (1) of the second U-shaped mounting block (12), and V-shaped clamping blocks (10) and a clamping drive cylinder (11) for driving the V-shaped clamping blocks (10) to move horizontally are arranged on the inner walls of both side plates of the second U-shaped mounting block (12).

3. The camshaft signal wheel press-fitting mechanism according to claim 2, characterized in that: The tops of both side plates of the first U-shaped mounting block (8) and the second U-shaped mounting block (12) are provided with elastic buffers (14), and the lower end surface of the lifting plate (5) is provided with two buffer guide blocks (15) respectively corresponding to the two elastic buffers (14).

4. The camshaft signal wheel press-fitting mechanism according to claim 3, characterized in that: Positioning columns (16) are provided at the front and rear ends of the tops of the two side plates of the first U-shaped mounting block (8) and the second U-shaped mounting block (12); when the lifting plate (5) descends to the limit position, the buffer guide block (15) abuts against the positioning columns (16), and each of the elastic buffer members (14) is located at the middle position of the two positioning columns (16) on the same side plate.

5. The camshaft signal wheel press-fitting mechanism according to claim 3 or 4, characterized in that: The elastic buffer (14) is a spring buffer or a hydraulic buffer.

6. The camshaft signal wheel press-fitting mechanism according to claim 1, characterized in that: The upper end surface of the lifting plate (5) is provided with a pressure sensor (17) and a sensor pressing block (18) (6) for vertically pressing and limiting the pressure sensor (17), and the lower end of the top column (4) is connected to the upper end of the pressure sensor (17).

7. The camshaft signal wheel press-fitting mechanism according to claim 1 or 6, characterized in that: The lifting plate (5) is connected to four rectangularly distributed guide rods (19), the top plate (3) is provided with four guide sleeves (20) respectively slidably matched with the guide rods (19), and the upper ends of the four guide rods (19) are connected to a positioning plate (21), a support block (22) is arranged on the positioning plate (21), a vertically arranged slider displacement sensor (23) is arranged on the top plate (3), and a conductive slider (24) of the slider displacement sensor (23) abuts against the support block (22).

8. The camshaft signal wheel press-fitting mechanism according to claim 1, characterized in that: Both left and right ends of the upper end surface of the bottom plate (1) are provided with limiting buffer blocks (25) for limiting the left and right sliding travel of the movable plate (2).

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