Camshaft detection device

Abstract

The utility model provides a camshaft detection device, which relates to the field of camshaft detection and comprises a bottom plate, a head end positioning assembly, a tail end positioning assembly and a controller with a display screen are arranged on the bottom plate, and a camshaft can rotate around the axis of the camshaft between the head end positioning assembly and the tail end positioning assembly; the base plate is further provided with a reference positioning assembly used for limiting the camshaft with a set zero reference, the head end positioning assembly is provided with an encoder used for detecting the rotation angle of the camshaft, and the position, close to the tail end of the camshaft, of the base plate is provided with a signal wheel positioning assembly used for blocking and positioning signal teeth of a signal wheel. The encoder is used for obtaining the rotation angle of the cam shaft when the cam shaft rotates to be positioned with the signal wheel positioning assembly from the zero position reference and detecting the installation angle of the signal wheel and displaying the installation angle through the display screen. The camshaft detection device is simple in structure, convenient to operate and high in detection efficiency, and can realize accurate detection of the press-fitting angle of the signal wheel.

Description

Technical Field

[0001] The utility model relates to the technical field of camshaft processing, in particular to a camshaft detection device. Background Art

[0002] The camshaft is an important component in a piston engine, and its function is to control the opening and closing of the valve. The existing camshafts are all equipped with a signal wheel, and the signal wheel is usually pressed at the end of the camshaft according to the set position through a dedicated press-fitting device. Since the existing automatic press-fitting equipment cannot accurately control the angle between the set gear teeth of the signal wheel and the set reference of the camshaft, in actual production, after the signal wheel is pressed, it is necessary to check the angle between the set gear teeth and the set reference, and control the angle deviation within the allowable tolerance range to ensure that the product can guarantee normal performance after being installed in the engine.

[0003] In the prior art, the three-coordinate measurement method is generally used to detect the angle between the wheel teeth and the camshaft reference after the signal wheel is installed. This detection method has cumbersome operating steps and low detection efficiency; or the set reference surface of the camshaft is positioned by a special detection tool, and then the detection positioning block at the position corresponding to the set wheel teeth of the signal wheel is operated, that is, if the detection positioning block can be smoothly inserted into the set teeth on the signal wheel, the press-fitting angle is judged to be qualified; if the detection positioning block cannot be inserted into the set teeth on the signal wheel, the press-fitting angle is judged to be out of tolerance and the product is unqualified; this detection method is applicable to working conditions with a larger tolerance range. With the continuous innovation of technology, the angle tolerance range of the signal wheel press-fitting is getting smaller and smaller, and this detection method is difficult to apply. Utility Model Content

[0004] In order to overcome at least one of the defects in the above prior art, the utility model provides a camshaft detection device, which has a simple structure, is easy to operate, can realize accurate detection of the signal wheel press-fitting angle, and has high detection efficiency.

[0005] The utility model provides a camshaft detection device: comprising a base plate, on which a head end positioning component, a tail end positioning component and a controller with a display screen are arranged for supporting and limiting the head and tail ends of the camshaft respectively, and the camshaft can rotate around its own axis between the head end positioning component and the tail end positioning component; the base plate is also provided with a reference positioning component for limiting the camshaft to set a zero position reference, the head end positioning component is provided with an encoder for detecting the rotation angle of the camshaft, and a signal wheel positioning component for blocking and positioning the signal teeth of the signal wheel is arranged at a position on the base plate near the tail end of the camshaft, and the encoder is used to obtain the rotation angle of the camshaft when it rotates from the zero position reference to the position positioned with the signal wheel positioning component, so as to detect the installation angle of the signal wheel and display it through the display screen.

[0006] Compared with the prior art, the camshaft detection device of the utility model has the following advantages:

[0007] The camshaft detection device of the utility model is a special equipment. During detection, the head and tail ends of the camshaft are first positioned between the head end positioning component and the tail end positioning component, and it is ensured that the camshaft can rotate smoothly under the action of external force, and then the reference positioning component is operated to drive the setting surface of the camshaft to cooperate with the reference positioning component, and the initial positioning position of the operation controller is recorded as zero, and the encoder data is cleared at this time; then the camshaft is rotated along the set direction, and the signal wheel positioning component is operated at the same time. When the camshaft rotates to the set gear tooth side surface on the signal wheel and cooperates with the signal wheel positioning component, the rotation is stopped, and the encoder converts it into a specific numerical value according to the rotation angle value. The detection result can be directly displayed on the display screen, so that the detection of the press-fitting angle of the camshaft signal wheel is fast and convenient, and the detection accuracy is high.

[0008] As an improvement, the signal wheel positioning assembly includes a signal wheel positioning seat, a slide groove is provided on the top of the signal wheel positioning seat, and a gear positioning block is slidably mounted in the slide groove for extending into the signal gear teeth set by the signal wheel for limiting the position.

[0009] As a further improvement, the gear tooth positioning block includes a first positioning block for clamping and limiting the position with the signal gear teeth of the intake camshaft, and a second positioning block for clamping and limiting the position with the signal gear teeth of the exhaust camshaft.

[0010] Further improved, the head end positioning assembly includes a head end positioning seat, a first rotating shaft concentric with the camshaft is passed through the head end positioning seat, one end of the first rotating shaft is abutted against the head end of the camshaft, and the other end is connected to the encoder, and a support plate for fixing the encoder is also provided on the base plate; a zero position stop assembly for limiting the rotation of the first rotating shaft is provided on the head end positioning seat.

[0011] Further improved, the reference positioning assembly includes a first reference positioning unit and a second reference positioning unit, wherein the first reference positioning unit includes a first fixed block connected to the first rotating shaft, the first fixed block is slidably provided with a first positioning block for inserting and cooperating with a preset keyway on the outer wall of the camshaft head end, and a first positioning drive for driving the first positioning block to rise and fall; the second reference positioning unit includes a second fixed block connected to the base plate, the second fixed block is retractably connected with a second positioning block for abutting against a preset stop plane on the outer wall of the camshaft in a horizontal direction, and a second positioning drive for driving the second positioning block to move horizontally.

[0012] As a further improvement, a first mounting seat is further provided on the base plate, and a radial runout detection component for detecting the runout of the cam peripheral wall of the camshaft is provided on the upper end of the first mounting seat.

[0013] As a further improvement, a second mounting seat is further provided on the bottom plate, and an end face runout detection component for detecting the flatness of the end face of the signal wheel at the rear end of the camshaft is provided on the upper end of the second mounting seat.

[0014] Further improved, the tail end positioning assembly includes a tail end positioning seat, a second rotating shaft concentric with the camshaft is passed through the tail end positioning seat, one end of the second rotating shaft is used to abut against the tail end of the camshaft, the tail end positioning seat is also provided with a push-pull clamp for driving the second rotating shaft to move axially, and the tail end positioning seat is also provided with a positioning member for limiting the axial position of the second rotating shaft.

[0015] In a further improvement, a support seat for supporting the camshaft is further provided on the bottom plate between the head end positioning assembly and the tail end positioning assembly, and a V-shaped positioning groove is provided on the top of the support seat. In the above improved structure, the support seat and the V-shaped positioning groove further improve the stability of the camshaft during detection, and the lower part of the camshaft is supported when it rotates, which is more stable and avoids the risk of the camshaft falling.

[0016] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural diagram of the camshaft detection device of the utility model in a non-working state;

[0018] Figure 2This is a working state structure diagram of the camshaft detection device of the utility model; (controller removed)

[0019] Figure 3 It is a partial schematic diagram of the assembly structure of the first reference positioning unit and the camshaft in the utility model;

[0020] Figure 4 It is a partial schematic diagram of the assembly structure of the second reference positioning unit and the camshaft in the utility model;

[0021] Figure 5 It is a partial schematic diagram of the sliding connection structure between the tail end positioning seat and the bottom plate in the utility model.

[0022] Description of reference numerals:

[0023] 1. Base plate; 2. Controller; 3. Encoder; 4. Signal wheel positioning seat; 5. Gear tooth positioning block; 6. Head end positioning seat; 7. First rotating axis; 8. Support plate; 9. First fixed block; 10. First positioning block; 11. First positioning drive member; 12. Second fixed block; 13. Second positioning block; 14. Second positioning drive member; 15. First mounting seat; 16. Radial runout detection assembly; 17. Second mounting seat; 18. End face runout detection assembly; 19. Tail end positioning seat; 20. Second rotating axis; 21. Push-pull clamp; 22. Support seat; 23. V-shaped positioning groove; 24. Keyway; 25. Stop plane; 26. Sliding channel; 27. Sliding block; 28. Locking wrench. DETAILED DESCRIPTION

[0024] First, those skilled in the art should understand that these implementations 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 to them as needed 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 limited, 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 a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, 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 is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] See also Figure 1 to Figure 5As shown, an embodiment of the present application discloses a camshaft detection device, including a base plate 1. In actual application, the base plate 1 is generally fixed on an operating table in a workshop, and a plurality of supporting feet are provided at the bottom of the base plate 1.

[0028] The base plate 1 is provided with a head end positioning component, a tail end positioning component and a controller 2 with a display screen for supporting and limiting the head and tail ends of the camshaft respectively, and the two ends of the camshaft are positioned between the head end positioning component and the tail end positioning component, and the camshaft can rotate around its own axis when driven by an external force; the base plate 1 is also provided with a reference positioning component for limiting the camshaft to a set zero position reference, and the head end positioning component is provided with an encoder 3 for detecting the rotation angle of the camshaft, and a signal wheel positioning component for blocking and positioning the signal teeth of the signal wheel is provided on the base plate 1 near the tail end of the camshaft, and the encoder 3 is used to obtain the rotation angle of the camshaft when it rotates from the zero position reference to the positioning with the signal wheel positioning component, so as to detect the installation angle of the signal wheel and display it through the display screen.

[0029] When the above structure is used for testing, the head and tail ends of the camshaft are first positioned between the head end positioning component and the tail end positioning component, and it is ensured that the camshaft can rotate smoothly under the action of external force, and then the reference positioning component is operated to drive the set surface of the camshaft to cooperate with the reference positioning component, and the controller 2 is operated, and the starting positioning position is recorded as zero, at which time the encoder 3 data is cleared; then the camshaft is rotated along the set direction, and the signal wheel positioning component is operated at the same time. When the camshaft rotates to the set gear tooth side on the signal wheel and cooperates with the signal wheel positioning component, it stops rotating, and the encoder 3 converts the rotation angle value into a specific numerical value, which is then displayed on the display screen. Of course, the controller 2 can pre-store the allowable angle difference range, so that the controller 2 can directly determine whether the product is qualified based on data comparison, and display it on the display screen at the same time, and can even set an alarm prompt. When the product is unqualified, the alarm sounds; the above structure is fast and convenient for detecting the pressing angle of the camshaft signal wheel, and the detection accuracy is high.

[0030] In this embodiment, the signal wheel positioning assembly includes a signal wheel positioning seat 4 fixed on the bottom plate 1, and a slide groove perpendicular to the axial direction of the camshaft is provided on the top of the signal wheel positioning seat 4, and a gear tooth positioning block 5 for extending into the signal gear teeth set by the signal wheel for limiting the position is slidably installed in the slide groove. During detection, the rotation end point is limited by the cooperation between the gear tooth positioning block 5 and the set gear teeth. More specifically, the gear tooth positioning block 5 is composed of two first positioning blocks 10 for clamping and limiting the position with the signal gear teeth of the intake camshaft, and a second positioning block 13 for clamping and limiting the position with the signal gear teeth of the exhaust camshaft; that is, when the camshaft to be detected is the intake camshaft, the positioning operation is realized by the first positioning block 10; when the camshaft to be detected is the exhaust camshaft, the positioning operation is realized by the second positioning block 13. One tooling realizes the signal wheel detection of two types of camshafts, and has strong versatility.

[0031] Similarly, in the above structure, the head end positioning assembly includes a head end positioning seat 6 fixed on the base plate 1, a first rotating shaft 7 concentric with the camshaft is horizontally penetrated through the upper end of the head end positioning seat 6, and one end of the first rotating shaft 7 is abutted against the head end of the camshaft, the other end of the first rotating shaft 7 is connected to the encoder 3, and a support plate 8 for fixing the encoder 3 is also provided on the base plate 1; in addition, a zero position stop assembly for limiting the rotation of the first rotating shaft 7 is provided on the head end positioning seat 6, which includes a stop block and a locking wrench 28, and in addition, a zero position limit ring is provided at one end of the first rotating shaft 7 close to the camshaft, and a stop plane 25 is provided on the outer wall of the limit ring, one end of the stop block is used to abut and cooperate with the stop plane 25 to limit the rotation of the first rotating shaft 7, and the other end is connected to the head end positioning seat 6 through the locking wrench 28.

[0032] In addition, the reference positioning assembly includes a first reference positioning unit and a second reference positioning unit, wherein the first reference positioning unit includes a first fixed block 9 connected to the first rotating shaft 7, and the first fixed block 9 is slidably provided with a first positioning block 10 for inserting and cooperating with a preset keyway 24 on the outer wall of the camshaft head end in a direction perpendicular to the camshaft, and a first positioning drive 11 for driving the first positioning block 10 to rise and fall; the first positioning drive 11 here includes a manual push rod, and the first positioning hole is slidably mounted on the first fixed block 9 in a vertical direction. By rotating the manual push rod, it can be used to drive the first fixed block 9 to move up and down, so that the first positioning hole can be inserted into or disengaged from the preset keyway 24 on the outer wall of the camshaft head end, which is very convenient.

[0033] The second reference positioning unit includes a second fixed block 12 connected to the base plate 1, and a second positioning block 13 is retractably connected to the second fixed block 12 in a horizontal direction for abutting against a preset stop plane 25 on the outer wall of the camshaft, and a second positioning drive 14 is used to drive the second positioning block 13 to move horizontally; the second positioning drive 14 here includes a driving rod, which is slidably mounted on the upper end of the second fixed block 12, one end of which is connected to the second positioning block 13, and the other end is connected to a push-pull clamp 21 structure, and the first positioning block 10 can be driven forward to abut against the set plane on the outer wall of the camshaft by pushing the push-pull clamp 21.

[0034] In this embodiment, two positioning units with different references are provided to be applicable to camshafts of different shapes. During detection, one of the reference positioning units can be selected according to the specific shape of the cam, which is very convenient.

[0035] A first mounting seat 15 is also provided on the bottom plate 1, and a radial runout detection assembly 16 for detecting the runout of the cam peripheral wall of the camshaft is provided on the upper end of the first mounting seat 15. The radial runout detection assembly 16 includes a first movable bar and a first runout meter, and the first movable bar is horizontally extendable and retractable and connected to the top of the first mounting seat 15, one end of which is used to abut against the outer wall of the camshaft, and the other end is abutted against the needle of the first runout meter.

[0036] A second mounting seat 17 is also provided on the base plate 1, and an end face runout detection assembly 18 for detecting the flatness of the end face of the signal wheel at the rear end of the camshaft is provided on the upper end of the second mounting seat 17. Similarly, the end face runout detection assembly 18 here includes a second movable bar and a second runout meter. The second movable bar is horizontally extendable and retractable and is connected to the top of the second mounting seat 17. One end of the second movable bar is used to abut against the end face of the camshaft signal wheel, and the other end is used to abut against the needle of the first runout meter.

[0037] In this embodiment, the tail end positioning assembly includes a tail end positioning seat 19, and a second rotating shaft 20 concentric with the cam shaft is horizontally passed through the upper end of the tail end positioning seat 19, and one end of the second rotating shaft 20 is used to abut against the tail end of the cam shaft. The tail end positioning seat 19 is also provided with a push-pull clamp 21 for driving the second rotating shaft 20 to move axially, and the tail end positioning seat 19 is also provided with a positioning member for limiting the axial position of the second rotating shaft 20. Specifically, an installation channel coaxial with the camshaft is opened at the upper end of the tail end positioning seat 19, and the second rotating shaft 20 is slidably mounted in the installation channel along its axial direction, and a positioning plane extending along its axial direction is provided on the outer wall of the second rotating shaft 20, and a positioning screw is passed through the outer wall of the tail end positioning seat 19, and the inner end of the positioning screw abuts against the positioning plane to achieve the limitation of the position of the second rotating shaft 20; when it is necessary to axially move the second rotating shaft 20 to press against the axial direction of the camshaft, loosen the positioning screw, and drive the second rotating shaft 20 to move in the direction close to the camshaft by operating the push-pull clamp 21, which is very convenient.

[0038] More specifically, a sliding channel 26 extending along the axial direction of the camshaft is provided on the base plate 1, a slider 27 is slidably mounted in the sliding channel 26, a locking wrench 28 is connected to the bottom end of the tail end positioning seat 19, and the lower end of the locking wrench 28 is connected to the slider 27 to realize the connection between the slider 27 and the tail end positioning seat 19, and when in the tightened state, the tail end positioning seat 19 cannot slide relative to the base plate 1, and when the axial position of the tail end positioning seat 19 needs to be moved, the locking wrench 28 can be loosened.

[0039] On the other hand, in order to improve the stability during camshaft detection, two support seats 22 for supporting the camshaft are arranged between the head end positioning assembly and the tail end positioning assembly on the base plate 1, and V-shaped positioning grooves 23 are arranged on the tops of the two support seats 22.

[0040] In the description of the present application, the description with reference to the terms "present embodiment", "some embodiments", etc. means that the specific features, mechanisms, materials or characteristics described in conjunction 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0041] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A camshaft detection device, characterized in that: The invention comprises a base plate (1), on which a head end positioning component and a tail end positioning component for supporting and limiting the head and tail ends of a camshaft respectively are arranged, and a controller (2) with a display screen, and the camshaft can rotate around its own axis between the head end positioning component and the tail end positioning component; the base plate (1) is also provided with a reference positioning component for limiting the camshaft to set a zero position reference, the head end positioning component is provided with an encoder (3) for detecting the rotation angle of the camshaft, and a signal wheel positioning component for blocking and positioning the signal teeth of a signal wheel is arranged on the base plate (1) near the tail end of the camshaft, and the encoder (3) is used to obtain the rotation angle of the camshaft when it rotates from the zero position reference to the position positioned with the signal wheel positioning component, so as to detect the installation angle of the signal wheel and display it through the display screen.

2. The camshaft detection device according to claim 1, characterized in that: The signal wheel positioning assembly comprises a signal wheel positioning seat (4), the top of which is provided with a slide groove, in which a gear positioning block (5) is slidably mounted for extending into the signal gear teeth set on the signal wheel for limiting the position.

3. The camshaft detection device according to claim 2, characterized in that: The gear tooth positioning block (5) comprises a first positioning block (10) for clamping and limiting the position with the signal gear teeth of the intake camshaft, and a second positioning block (13) for clamping and limiting the position with the signal gear teeth of the exhaust camshaft.

4. The camshaft detection device according to claim 1, characterized in that: The head end positioning assembly comprises a head end positioning seat (6), a first rotating shaft (7) concentric with the cam shaft is passed through the head end positioning seat (6), one end of the first rotating shaft (7) is in contact with the head end of the cam shaft, and the other end is connected to the encoder (3), and a support plate (8) for fixing the encoder (3) is also provided on the base plate (1); a zero position stop assembly for limiting the rotation of the first rotating shaft (7) is provided on the head end positioning seat (6).

5. The camshaft detection device according to claim 4, characterized in that: The reference positioning assembly comprises a first reference positioning unit and a second reference positioning unit, wherein the first reference positioning unit comprises a first fixed block (9) connected to the first rotating shaft (7), the first fixed block (9) being slidably provided with a first positioning block (10) for inserting and cooperating with a keyway (24) preset on the outer wall of the camshaft head end, and a first positioning driving member (11) for driving the first positioning block (10) to rise and fall; the second reference positioning unit comprises a second fixed block (12) connected to the base plate (1), the second fixed block (12) being retractably connected with a second positioning block (13) for abutting against a stop plane (25) preset on the outer wall of the camshaft in a horizontal direction, and a second positioning driving member (14) for driving the second positioning block (13) to move horizontally.

6. The camshaft detection device according to any one of claims 1 to 5, characterized in that: A first mounting seat (15) is also provided on the base plate (1), and a radial runout detection component (16) for detecting the runout of the cam outer peripheral wall of the camshaft is provided at the upper end of the first mounting seat (15).

7. The camshaft detection device according to claim 6, characterized in that: A second mounting seat (17) is also provided on the base plate (1), and an end face runout detection assembly (18) for detecting the flatness of the end face of the signal wheel at the rear end of the camshaft is provided at the upper end of the second mounting seat (17).

8. The camshaft detection device according to claim 6, characterized in that: The tail end positioning assembly comprises a tail end positioning seat (19), a second rotating shaft (20) concentric with the cam shaft is passed through the tail end positioning seat (19), one end of the second rotating shaft (20) is used to abut against the tail end of the cam shaft, the tail end positioning seat (19) is also provided with a push-pull clamp (21) for driving the second rotating shaft (20) to move axially, and the tail end positioning seat (19) is also provided with a positioning member for limiting the axial position of the second rotating shaft (20).

9. The camshaft detection device according to claim 1, characterized in that: A support seat (22) for supporting the camshaft is also provided on the bottom plate (1) between the head end positioning assembly and the tail end positioning assembly, and a V-shaped positioning groove (23) is provided on the top of the support seat (22).

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