Camshaft keyway milling clamp

Abstract

The utility model provides a camshaft keyway milling clamp which comprises a fixed frame, a fixed V-shaped frame, a movable V-shaped frame, a movable clamping jaw, a driving cylinder and a driving shaft, the fixed V-shaped frame is fixed on the upper end face of the fixed frame, a lifting column is installed at the bottom of the movable V-shaped frame, and the movable V-shaped frame is installed on the upper end face of the fixed frame through the lifting column in an up-down moving mode. An output shaft is installed on the driving air cylinder, the driving shaft is installed on the output shaft, the movable clamping jaw comprises a first clamping jaw body and a second clamping jaw body, a first long-strip-shaped through hole and a second long-strip-shaped through hole are obliquely formed in the first clamping jaw body and the second clamping jaw body respectively, and the driving shaft penetrates through the first long-strip-shaped through hole and the second long-strip-shaped through hole to be arranged. According to the cam shaft clamping device, the cam shaft can be automatically clamped and fixed, a key groove and an eccentric wheel of the cam shaft can be independently fixed during clamping and fixing, and the machining precision of a workpiece is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of camshaft processing, in particular to a milling fixture for camshaft keyways. Background Technique

[0002] A camshaft is a component in a piston engine. Its function is to control the opening and closing of the valves. Although the rotational speed of the camshaft is half of that of the crankshaft in a four-stroke engine (the rotational speed of the camshaft is the same as that of the crankshaft in a two-stroke engine), generally its rotational speed is still very high and it needs to bear a large torque. Therefore, in the design, the requirements for the camshaft in terms of strength and support are very high, and its material is generally high-quality alloy steel or alloy steel. Since the valve motion law is related to the power and operating characteristics of an engine, the grinding process of the camshaft is a very important processing operation.

[0003] During the clamping process of the camshaft during cutting processing, a three-jaw chuck is used for clamping, resulting in inconvenient and unstable clamping and positioning of the camshaft. The workpiece may be damaged during the clamping process, and manual alignment is required before clamping. Such an operation not only has the problem of low efficiency but also has a large potential safety hazard in operation. Content of the Utility Model

[0004] To solve the above technical problems, the utility model proposes a milling fixture for camshaft keyways, which can realize automatic clamping and fixing of the camshaft. When clamping and fixing, the keyway and eccentric wheel of the camshaft are fixed separately, effectively ensuring the machining accuracy of the workpiece.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] Camshaft keyway milling fixture, characterized in that: it includes a fixed frame, a fixed V-shaped frame and a movable V-shaped frame. The fixed V-shaped frame is fixed on the upper end surface of the fixed frame. A lifting column is installed at the bottom of the movable V-shaped frame. The movable V-shaped frame is movably installed on the upper end surface of the fixed frame through the lifting column. Positioning grooves are respectively provided on the fixed V-shaped frame and the movable V-shaped frame. When the camshaft is placed in the positioning groove on the fixed V-shaped frame, the eccentric cam on the camshaft is located in the positioning groove on the movable V-shaped frame. It also includes a movable jaw, a driving cylinder and a driving shaft. An output shaft is installed on the driving cylinder, and the driving shaft is installed on the output shaft. The movable jaw includes a first jaw and a second jaw. First long strip-shaped through holes and second long strip-shaped through holes are respectively inclined on the first jaw and the second jaw. The first jaw and the second jaw are respectively hinged on the fixed V-shaped frame and are located on both sides of the positioning groove thereon. The driving shaft is arranged through the first long strip-shaped through hole and the second long strip-shaped through hole. When the output shaft moves up and down, the driving shaft moves up and down accordingly, and drives the first jaw and the second jaw to move away from or close to each other through the first long strip-shaped through hole and the second long strip-shaped through hole. The lifting column and the driving shaft are on the same vertical line. When the driving shaft moves upward, the driving shaft jacks up the lifting column upward, and the movable V-shaped frame rises accordingly. It also includes a fixed plate and an axial positioning pin. The fixed plate is vertically fixed on one side of the fixed frame, and the axial positioning pin is fixed on the fixed plate. The axial positioning pin and the positioning groove are on the same horizontal line. When the camshaft is placed in the positioning groove, the keyway at the end of the camshaft is inserted on the axial positioning pin.

[0007] In the above structure: The camshaft keyway milling fixture proposed in this application includes a fixed frame, a fixed V-shaped frame, and a movable V-shaped frame. The fixed frame is used to install and fix the fixed V-shaped frame and the movable V-shaped frame. Positioning grooves are respectively provided on the fixed V-shaped frame and the movable V-shaped frame. Among them, the fixed V-shaped frame is used to place the camshaft, and the movable V-shaped frame is used to place the eccentric wheel. An active jaw, a driving cylinder, and a driving shaft are also provided. The driving shaft is installed on the output shaft, and the up and down movement of the driving shaft is realized through the driving cylinder and the output shaft. A first long strip-shaped through hole and a second long strip-shaped through hole are respectively inclined on the first jaw and the second jaw. The first jaw and the second jaw are respectively hinged on the fixed V-shaped frame and are located on both sides of the positioning groove thereon. The driving shaft passes through the first long strip-shaped through hole and the second long strip-shaped through hole. By driving the up and down movement of the output shaft by the driving cylinder, when the output shaft moves up and down, the driving shaft will also move up and down accordingly. Through the first long strip-shaped through hole and the second long strip-shaped through hole, the first jaw and the second jaw are driven to move away from or close to each other, so as to realize the clamping and fixing of the camshaft in the positioning groove. Among them, the lifting column and the driving shaft are on the same vertical line. When the driving shaft moves upward, the driving shaft jacks up the lifting column. At this time, the movable V-shaped frame rises accordingly, realizing the fixed tightening of the eccentric wheel. A fixed plate and an axial positioning pin are also provided. The fixed plate is vertically fixed on one side of the fixed frame, and the axial positioning pin is fixed on the fixed plate. When the camshaft is placed in the positioning groove, the keyway at the end of the camshaft is inserted on the axial positioning pin.

[0008] Principle of use of this application:

[0009] The driving cylinder is in the retracted state. At this time, the first jaw and the second jaw are in the open state. The camshaft is placed on the fixed V-shaped frame. At this time, the eccentric cylindrical surface on the camshaft faces downward, so that the positioning groove on the movable V-shaped block is aligned with the eccentric cylindrical surface for angular positioning, that is, angular positioning of the eccentric wheel. At this time, the axial direction of the camshaft is positioned by the axial positioning pin. The axial direction of the camshaft is connected to the axial positioning pin to ensure the accurate axial position of the keyway. After starting the driving cylinder, the output shaft is driven to move upward by the driving cylinder, and the output shaft drives the driving shaft to move upward together. The driving shaft drives the first jaw and the second jaw to approach each other to clamp the camshaft in the positioning groove on the fixed V-shaped frame. When the driving shaft rises, it jacks up the lifting column, and the rising of the lifting column causes the movable V-shaped frame to rise accordingly to tightly hold the eccentric wheel in its positioning groove. By driving the output shaft to descend by the driving cylinder, the first jaw and the second jaw move away from each other to loosen the camshaft in the positioning groove on the fixed V-shaped frame. At this time, the lifting column will also descend, loosening the eccentric wheel in the positioning groove on the movable V-shaped frame, and loosening the axial positioning pin, and then the camshaft can be removed.

[0010] Further: It further includes a fixture base body, on the upper end surface of which the fixing frame and the driving cylinder are respectively fixed. The fixing frame is of a convex structure, and the driving cylinder is located below the fixing frame.

[0011] In the above structure: The fixture base body is used to realize the fixed installation of the fixing frame and the driving cylinder and is the main carrier for installing other components.

[0012] Further: It further includes a cylinder fixing seat, which is fixed on the fixture base body and located below the fixing frame, and the driving cylinder is installed in the cylinder fixing seat.

[0013] In the above structure: The cylinder fixing seat is fixed on the fixture base body and is used to realize the fixing and installation of the driving cylinder.

[0014] Further: It further includes a movable seat. There is an installation through hole on the fixing frame. The movable seat is fixedly installed in the installation through hole and is on the same vertical line as the driving shaft. The lifting column is installed in the movable seat and protrudes from the lifting column.

[0015] In the above structure: The movable seat is used to realize the installation of the lifting column, facilitating its movement on the fixing frame. The movable seat and the driving shaft are on the same vertical line, facilitating the driving shaft to drive the lifting column inside to move up and down.

[0016] Further: There are two fixed V-shaped frames, namely the first fixed V-shaped frame and the second fixed V-shaped frame, which are respectively fixed on the upper end surface of the fixing frame. There is one movable V-shaped frame, and the movable V-shaped frame is located between the first fixed V-shaped frame and the second fixed V-shaped frame and is close to the second fixed V-shaped frame.

[0017] In the above structure: There are two fixed V-shaped frames, namely the first fixed V-shaped frame and the second fixed V-shaped frame, which make the fixation of the camshaft more firm. The movable V-shaped frame is located between the first fixed V-shaped frame and the second fixed V-shaped frame and is close to the second fixed V-shaped frame, facilitating the fixation of the eccentric wheel on the camshaft.

[0018] Further: The positioning grooves are respectively opened at the central positions on the first fixed V-shaped frame, the second fixed V-shaped frame, and the movable V-shaped frame.

[0019] Compared with the prior art, the beneficial effects of the present utility model are:

[0020] The utility model can realize the automatic clamping and fixing of the camshaft through the driving cylinder, the driving shaft and the movable clamping jaw, without manual operation, which not only saves labor costs, but also greatly improves work efficiency through automated operation. This application fixes the camshaft through the fixed V-shaped frame, fixes the eccentric wheel through the movable V-shaped frame, and realizes the axial positioning of the camshaft through the axial positioning pin. The fixing of the camshaft and the eccentric wheel thereon is realized through the three, which not only ensures the machining accuracy of the workpiece but also facilitates the machining of the camshaft. Brief Description of the Drawings

[0021] Figure 1 is a schematic structural view of the utility model;

[0022] Figure 2 is a schematic structural view of the fixing frame.

[0023] List of Reference Numerals:

[0024] 1. Fixing frame; 2. Fixed V-shaped frame; 21. First fixed V-shaped frame; 22. Second fixed V-shaped frame; 3. Movable V-shaped frame; 31. Positioning groove; 4. Movable clamping jaw; 41. First clamping jaw; 42. Second clamping jaw; 43. First long strip-shaped through hole; 44. Second long strip-shaped through hole; 5. Driving cylinder; 51. Cylinder fixing seat; 6. Driving shaft; 7. Output shaft; 8. Fixed plate; 9. Axial positioning pin; 10. Fixture base; 11. Movable seat; 12. Camshaft; 13. Lifting column. Detailed Description of the Preferred Embodiment

[0025] The following further describes the present utility model in detail in conjunction with the drawings and the specific embodiments:

[0026] As Figure 1-2As shown in the figure, the present utility model provides a milling fixture for a camshaft keyway, which includes a fixed frame 1, a fixed V-shaped frame 2 and a movable V-shaped frame 3. The fixed V-shaped frame 2 is fixed on the upper end surface of the fixed frame 1. A lifting column 13 is installed at the bottom of the movable V-shaped frame 3, and the movable V-shaped frame 3 is movably installed on the upper end surface of the fixed frame 1 through the lifting column 13. Positioning grooves 31 are respectively provided on the fixed V-shaped frame 2 and the movable V-shaped frame 3. When the camshaft 12 is placed in the positioning groove 31 on the fixed V-shaped frame 2, the eccentric cam on the camshaft 12 is located in the positioning groove 31 on the movable V-shaped frame 3. It also includes a movable jaw 4, a driving cylinder 5 and a driving shaft 6. An output shaft 7 is installed on the driving cylinder 5, and the driving shaft 6 is installed on the output shaft 7. The movable jaw 4 includes a first jaw 41 and a second jaw 42. First long strip-shaped through holes 43 and second long strip-shaped through holes 44 are respectively inclinedly provided on the first jaw 41 and the second jaw 42. The first jaw 41 and the second jaw 42 are respectively hinged on the fixed V-shaped frame 2 and are located on both sides of the positioning groove 31 thereon. The driving shaft 6 is arranged through the first long strip-shaped through hole 43 and the second long strip-shaped through hole 44. When the output shaft 7 moves up and down, the driving shaft 6 moves up and down accordingly, and drives the first jaw 41 and the second jaw 42 to move away from or close to each other through the first long strip-shaped through hole 43 and the second long strip-shaped through hole 44. The lifting column 13 and the driving shaft 6 are on the same vertical line. When the driving shaft 6 moves upward, the driving shaft 6 jacks up the lifting column 13 upward, and the movable V-shaped frame 3 rises accordingly. It also includes a fixing plate 8 and an axial positioning pin 9. The fixing plate 8 is vertically fixed on one side of the fixed frame 1, and the axial positioning pin 9 is fixed on the fixing plate 8. The axial positioning pin 9 and the positioning groove 31 are on the same horizontal line. When the camshaft 12 is placed in the positioning groove 31, the keyway at the end of the camshaft 12 is inserted on the axial positioning pin 9.

[0027] The camshaft keyway milling fixture proposed in this application includes a fixed frame 1, a fixed V-shaped frame 2, and a movable V-shaped frame 3. The fixed frame 1 is used to install and fix the fixed V-shaped frame 2 and the movable V-shaped frame 3. Positioning grooves 31 are respectively arranged on the fixed V-shaped frame 2 and the movable V-shaped frame 3. Among them, the fixed V-shaped frame 2 is used to place the camshaft 12, and the movable V-shaped frame 3 is used to place the eccentric wheel. An active jaw 4, a driving cylinder 5, and a driving shaft 6 are also provided. The driving shaft 6 is installed on the output shaft 7, and the up and down movement of the driving shaft 6 is realized through the driving cylinder 5 and the output shaft 7. First long strip-shaped through holes 43 and second long strip-shaped through holes 44 are respectively inclinedly arranged on the first jaw 41 and the second jaw 42. The first jaw 41 and the second jaw 42 are respectively hinged on the fixed V-shaped frame 2 and are located on both sides of the positioning groove 31 thereon. The driving shaft 6 is arranged through the first long strip-shaped through hole 43 and the second long strip-shaped through hole 44. By driving the up and down movement of the output shaft 7 through the driving cylinder 5, when the output shaft 7 moves up and down, the driving shaft 6 will also move up and down accordingly. The first jaw 41 and the second jaw 42 are driven through the first long strip-shaped through hole 43 and the second long strip-shaped through hole 44 to move away from or close to each other, so as to realize the clamping and fixing of the camshaft 12 in the positioning groove 31. Among them, the lifting column 13 and the driving shaft 6 are on the same vertical line. When the driving shaft 6 moves upward, the driving shaft 6 jacks up the lifting column 13 upward. At this time, the movable V-shaped frame 3 rises accordingly, realizing the fixed jacking of the eccentric wheel. The fixed plate 8 and the axial positioning pin 9 are also arranged. The fixed plate 8 is vertically fixed on one side of the fixed frame 1, and the axial positioning pin 9 is fixed on the fixed plate 8. When the camshaft 12 is placed in the positioning groove 31, the keyway at the end of the camshaft 12 is inserted on the axial positioning pin 9.

[0028] The working principle of this application:

[0029] The driving cylinder 5 is in the retracted state. At this time, the first jaw 41 and the second jaw 42 are in the open state. The camshaft 12 is placed on the fixed V-shaped frame 2. At this time, the eccentric cylindrical surface on the camshaft 12 faces downward, so that the positioning groove 31 on the movable V-shaped block aligns with the eccentric cylindrical surface for angular positioning, that is, angular positioning of the eccentric wheel. At this time, the axial direction of the camshaft 12 is positioned by the axial positioning pin 9. The axial direction of the camshaft 12 is connected to the axial positioning pin 9 to ensure the accurate axial position of the keyway. After starting the driving cylinder 5, the output shaft 7 is driven by the driving cylinder 5 to move upward. The output shaft 7 drives the driving shaft 6 to move upward together. The driving shaft 6 drives the first jaw 41 and the second jaw 42 to approach each other to clamp the camshaft 12 in the positioning groove 31 on the fixed V-shaped frame 2. When the driving shaft 6 rises, it jacks up the lifting column 13. The rising of the lifting column 13 causes the movable V-shaped frame 3 to rise and press tightly on the eccentric wheel in its positioning groove 31. By driving the output shaft 7 to descend by the driving cylinder 5, the first jaw 41 and the second jaw 42 move away from each other to loosen the camshaft 12 in the positioning groove 31 on the fixed V-shaped frame 2. At this time, the lifting column 13 also descends to loosen the eccentric wheel in the positioning groove 31 on the movable V-shaped frame 3, and the axial positioning pin 9 is loosened, and then the camshaft 12 can be taken off.

[0030] In this embodiment: It further includes a fixture base 10. The fixed frame 1 and the driving cylinder 5 are respectively fixed on the upper end surface of the fixture base 10. The fixed frame 1 is of a convex structure, and the driving cylinder 5 is located below the fixed frame 1. The fixture base 10 is used to realize the fixed installation of the fixed frame 1 and the driving cylinder 5 and is the main carrier for installing other components.

[0031] In this embodiment: It further includes a cylinder fixed seat 51. The cylinder fixed seat 51 is fixed on the fixture base 10 and is located below the fixed frame 1. The driving cylinder 5 is installed in the cylinder fixed seat 51. The cylinder fixed seat 51 is fixed on the fixture base 10 and is used to realize the fixed and installation of the driving cylinder 5.

[0032] In this embodiment: It further includes a movable seat 11. The fixed frame 1 is provided with an installation through hole. The movable seat 11 is fixedly installed in the installation through hole and is on the same vertical line as the driving shaft 6. The lifting column 13 is installed in the movable seat 11 and protrudes from the lifting column 13. The movable seat 11 is used to realize the installation of the lifting column 13, facilitate its movement on the fixed frame 1, and the movable seat 11 is on the same vertical line as the driving shaft 6, which facilitates the driving shaft 6 to drive the lifting column 13 inside to move up and down.

[0033] In this embodiment: The fixed V-shaped frame 2 is provided with two, namely a first fixed V-shaped frame 21 and a second fixed V-shaped frame 22, which are respectively fixed on the upper end surface of the fixed frame 1. The movable V-shaped frame 3 is provided with one, and the movable V-shaped frame 3 is located between the first fixed V-shaped frame 21 and the second fixed V-shaped frame 22 and is arranged close to the second fixed V-shaped frame 22. The fixed V-shaped frame 2 is provided with two, namely a first fixed V-shaped frame 21 and a second fixed V-shaped frame 22, which make the fixing of the camshaft 12 more firm. The movable V-shaped frame 3 is located between the first fixed V-shaped frame 21 and the second fixed V-shaped frame 22 and is arranged close to the second fixed V-shaped frame 22, which is convenient for fixing the eccentric wheel on the camshaft 12.

[0034] In this embodiment: The positioning grooves 31 are respectively opened at the central positions on the first fixed V-shaped frame 21, the second fixed V-shaped frame 22, and the movable V-shaped frame 3.

[0035] The utility model can realize the full-automatic fixing of the camshaft 12 through the driving cylinder 5, the driving shaft 6, and the movable clamping jaw 4, without manual operation, which not only saves labor costs but also greatly improves work efficiency through automated operation. This application realizes the fixing of the camshaft 12 through the fixed V-shaped frame 2, realizes the fixing of the eccentric wheel through the movable V-shaped frame 3, and realizes the axial positioning of the camshaft 12 through the axial positioning pin 9. The fixing of the camshaft 12 and the eccentric wheel on it is realized through the three, which not only ensures the machining accuracy of the workpiece but also facilitates the machining of the camshaft 12.

[0036] The above is only a preferred embodiment of the present utility model, and it is not a limitation to the present utility model in any other form. Any modification or equivalent change made according to the technical essence of the present utility model still belongs to the scope protected by the present utility model.

Claims

1. Camshaft keyway milling fixture, characterized by: The invention comprises a fixed frame (1), a fixed V-shaped frame (2) and a movable V-shaped frame (3), wherein the fixed V-shaped frame (2) is fixed on the upper end surface of the fixed frame (1), a lifting column (13) is installed at the bottom of the movable V-shaped frame (3), and the movable V-shaped frame (3) is installed on the upper end surface of the fixed frame (1) by means of the lifting column (13) so as to be movable up and down, and positioning grooves (31) are respectively provided on the fixed V-shaped frame (2) and the movable V-shaped frame (3), and when a camshaft (12) is placed in the positioning groove (31) on the fixed V-shaped frame (2), the camshaft (12) is moved upward and downward. The eccentric cam on the movable V-shaped frame (12) is located in a positioning groove (31) on the movable V-shaped frame (3), and also includes a movable clamping jaw (4), a driving cylinder (5) and a driving shaft (6), wherein the driving cylinder (5) is mounted with an output shaft (7), and the driving shaft (6) is mounted on the output shaft (7), and the movable clamping jaw (4) includes a first clamping jaw (41) and a second clamping jaw (42), wherein the first clamping jaw (41) and the second clamping jaw (42) are respectively obliquely provided with a first elongated through hole (43) and a second elongated through hole (44), and the first clamping jaw (4 1) and the second clamping jaw (42) are respectively hinged on the fixed V-shaped frame (2) and are located on both sides of the positioning groove (31) thereon, the driving shaft (6) is arranged to pass through the first long strip through hole (43) and the second long strip through hole (44), when the output shaft (7) moves up and down, the driving shaft (6) moves up and down accordingly, and drives the first clamping jaw (41) and the second clamping jaw (42) to move away from or close to each other through the first long strip through hole (43) and the second long strip through hole (44), the lifting column (13) and the driving shaft (6) are located on the same vertical line, when the driving shaft (6) moves up and down, the lifting column (13) and the driving shaft (6) are located on the same vertical line, when the driving shaft (6) moves up and down, the lifting column (13) and the second clamping jaw (41) and the second clamping jaw (42) move away from or close to each other through the first long strip through hole (43) and the second long strip through hole (44). When the shaft (6) moves upward, the driving shaft (6) pushes up the lifting column (13), and the movable V-shaped frame (3) rises upward accordingly. The driving shaft (6) also includes a fixing plate (8) and an axial positioning pin (9). The fixing plate (8) is vertically fixed on one side of the fixing frame (1), and the axial positioning pin (9) is fixed on the fixing plate (8). The axial positioning pin (9) and the positioning groove (31) are located on the same horizontal straight line. When the camshaft (12) is placed in the positioning groove (31), the keyway at the end of the camshaft (12) is inserted into the axial positioning pin (9).

2. The camshaft keyway milling fixture according to claim 1, characterized in that: It also comprises a clamp base (10), the fixing frame (1) and the driving cylinder (5) are respectively fixed on the upper end surface of the clamp base (10), the fixing frame (1) is a convex structure, and the driving cylinder (5) is located below the fixing frame (1).

3. The camshaft keyway milling fixture according to claim 2, characterized in that: It also comprises a cylinder fixing seat (51), the cylinder fixing seat (51) being fixed on the clamp base (10) and being located below the fixing frame (1), and the driving cylinder (5) being installed in the cylinder fixing seat (51).

4. The camshaft keyway milling fixture according to claim 1, characterized in that: It also comprises a movable seat (11), the fixed frame (1) is provided with a mounting through hole, the movable seat (11) is fixedly mounted in the mounting through hole and is located on the same vertical line as the driving shaft (6), and the lifting column (13) is mounted in the movable seat (11) and is arranged to protrude from the lifting column (13).

5. The camshaft keyway milling fixture according to claim 1, characterized in that: The fixed V-shaped frame (2) is provided with two, namely a first fixed V-shaped frame (21) and a second fixed V-shaped frame (22), which are respectively fixed on the upper end surface of the fixed frame (1); the movable V-shaped frame (3) is provided with one, and the movable V-shaped frame (3) is located between the first fixed V-shaped frame (21) and the second fixed V-shaped frame (22) and is arranged close to the second fixed V-shaped frame (22).

6. The camshaft keyway milling fixture according to claim 1 or 5, characterized in that: The positioning grooves (31) are respectively opened at the center positions of the first fixed V-shaped frame (21), the second fixed V-shaped frame (22) and the movable V-shaped frame (3).

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