Cam tool for camshaft grinding

Abstract

The present application belongs to the technical field of fixture and tooling, especially camshaft fixture design and precision clamping device, in particular to cam tool for camshaft grinding. It comprises a camshaft to be fixed and a tool assembly. The tool assembly comprises a fixing block with a through hole at one end. A longitudinal through slot is integrally formed on the inner wall of the through hole along the radial direction of the through hole. A clamping block is embedded in the longitudinal through slot. The end of the clamping block protrudes from the inner wall of the through hole in the lower state. The outer wall of the end of the camshaft is provided with a fitting groove matched with the protruding part of the clamping block. The end of the fixing block without the through hole is provided with a transverse through slot parallel to the axial direction of the through hole. A guide column is inserted into the transverse through slot. A fine adjustment assembly is installed on the outer side of the guide column. The other end of the guide column is used for active installation with a cam grinder driving device.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of clamps and tooling, in particular to the design and precision clamping device of camshaft clamp, and specifically relates to a cam tool for camshaft grinding. BACKGROUND

[0002] Camshaft is an important component in piston engine, which is used to control the opening and closing of engine valve. Camshaft has always been a difficulty in manufacturing of internal combustion engine parts due to its complex structure, high machining precision and low rigidity. The machining process of camshaft is generally to forge a blank first, and then turn and finish the blank. In the finishing process, the corresponding fixture or tooling must be matched to fix it.

[0003] At present, the fixture used is generally called camshaft grinding chuck, and the structures used by various manufacturers are different, but the general principle is similar. That is, it includes a fixed block, one end of the fixed block is provided with a through hole, and the other end of the fixed block is assembled through a connecting assembly and a cam grinding driving device. In the existing design, the fixing of the camshaft is generally designed for the through hole, which commonly includes an integral extension notch between the lower end of the through hole and the bottom surface of the fixed block. A locking bolt is threaded between the fixed blocks on both sides of the extension notch, and then the fine deformation of the through hole is adjusted by the position of the locking bolt to clamp it. Another way is to install a multi-petal clamp in the through hole, and then cooperate with the corresponding assembly to achieve loose fit.

[0004] As described above, the fixture used at present basically clamps and fixes the end of the camshaft in the radial direction by externally applying clamping force, but there is generally no restriction in the axial and circumferential directions. In addition, it does not have a corresponding fine adjustment mechanism. Once the camshaft and the tooling are fixed, the relative position of the camshaft to the finishing tool cannot be adjusted. SUMMARY

[0005] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide a cam tool for camshaft grinding, which can restrict the camshaft in the axial, radial and circumferential directions, and can fine-tune the position of the camshaft.

[0006] The technical scheme adopted by the present application is:

[0007] The cam tool for cam shaft grinding comprises a cam shaft to be fixed and a tool assembly, the tool assembly comprises a fixing block, one end of the fixing block is provided with a through hole, a telescopic gap is integrally formed between the lower end of the through hole and the bottom surface of the fixing block, a locking bolt is arranged between the fixing block on both sides of the telescopic gap, characterized in that a longitudinal through groove is integrally formed on the inner wall of the through hole in the radial direction of the through hole, a clamping block is embedded in the longitudinal through groove, the end of the clamping block protrudes from the inner wall of the through hole in the lower position, the outer wall of the end of the cam shaft is provided with a matching embedded groove of the protruding part of the clamping block, the end of the fixing block without the through hole is provided with a transverse through groove, the transverse through groove is parallel to the axial direction of the through hole, a guide column is arranged in the transverse through groove, a fine adjustment assembly is arranged on the outer side of the guide column, and the other end of the guide column is used for active installation of a cam grinding driving device.

[0008] Further, a strip-shaped hole is formed in the clamping block, a limiting pin is fixedly installed in the middle of the strip-shaped hole, a compression spring is installed between the limiting pin and the lower end of the strip-shaped hole, and the compression spring pushes the lower end of the clamping block out in the inelastic state.

[0009] Further, the transverse through groove is a rectangular groove, the guide column is a rectangular hard block, the thickness of the rectangular hard block is matched with the height of the through groove, the width of the rectangular hard block is smaller than the width of the through groove, and gaps exist between the left and right side walls of the transverse through groove and the left and right sides of the guide column in the state that the guide column penetrates into the transverse through groove.

[0010] Further, the fine adjustment assembly comprises a longitudinal screw and two lateral screws, the lower end of the longitudinal screw penetrates through the transverse through groove through the guide column, and the same side end of the two lateral screws penetrates into the transverse through groove in the direction perpendicular to the longitudinal screw and is pressed against the outer wall of the opposite side of the guide column.

[0011] Further, a rectangular hole is formed in the middle of the guide column, the rectangular hole is vertically and longitudinally through, the longitudinal screw penetrates into the rectangular hole from above until the inner wall of the transverse through groove on the other side penetrates in, the width of the rectangular hole is matched with the outer diameter of the longitudinal screw, and the length is greater than the outer diameter of the longitudinal screw.

[0012] The advantages and positive effects of the present application are as follows:

[0013] In the radial direction clamping and fixing, the original tool structure is still adopted, the clamping block is embedded in the longitudinal through groove, and is embedded in the embedded groove in the protruding state, so as to limit the axial position of the cam shaft, and at the same time, the circumferential rotation of the cam shaft is also limited. Compared with the existing fixture, the tool is limited in three directions, and the positioning effect is better.

[0014] In this invention, a transverse through-slot, guide post, longitudinal screw, and two lateral screws are used to fix the fixing block in a general direction, while allowing for orderly fine-tuning within a small range. The transverse through-slot, with its rectangular structure of a rectangular groove and guide post, restricts the circumferential rotation of the fixing block relative to the guide post. Because the thickness of the rectangular hard block and the height of the through-slot are well-matched, the vertical movement of the guide post is effectively limited, but lateral adjustment is still possible. The longitudinal screw, in conjunction with the rectangular hole made in the guide post, is used to adjust the front-to-back position of the fixing block. After both the front-to-back and lateral positions are adjusted, the block is securely fixed by the lateral screws on both sides. After clamping the camshaft to be machined, the corresponding feed and machining positions can be adjusted by fine adjustments to the positions of the fixing block and guide post. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention;

[0016] Figure 2 for Figure 1 A partial sectional view along the AA direction;

[0017] Figure 3 This is a perspective view of the invention in use. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments. The embodiments described below are illustrative and not limiting, and should not be used to limit the scope of protection of the present invention.

[0019] A cam fixture for camshaft grinding includes a camshaft 16 to be fixed and a fixture assembly. The fixture assembly includes a fixing block 4, one end of which has a through hole 5. A telescopic notch 7 is integrally formed between the lower end of the through hole and the bottom surface of the fixing block. A locking bolt 6 is inserted between the fixing blocks on both sides of the telescopic notch. The innovation of this invention is that a longitudinal through groove is integrally formed on the inner wall of the through hole extending outward along the radial direction of the through hole. A locking block 1 is embedded in the longitudinal through groove. The lower end 12 of the locking block protrudes from the inner wall of the through hole when in the lower position. The outer wall of the end of the camshaft has a groove 14 adapted to the protruding part of the locking block. A transverse through groove is formed on the end of the fixing block where the through hole is not formed. The transverse through groove is parallel to the axial direction of the through hole. A guide post 10 is inserted in the transverse through groove. A fine adjustment component is installed on the outside of the guide post. The other end of the guide post is used for movable installation with a cam grinding drive device.

[0020] In this embodiment, a strip-shaped hole 15 is formed inside the card block, and a limiting pin 14 is fixedly installed in the middle of the strip-shaped hole. A compression spring 13 is installed between the limiting pin and the lower end of the strip-shaped hole. The compression spring pushes out the lower end of the card block in a non-elastic state.

[0021] In this embodiment, the transverse through groove is a rectangular groove 2, and the guide post is a rectangular hard block. The thickness of the rectangular hard block is adapted to the height of the through groove, and the width of the rectangular hard block is smaller than the width of the through groove. When the guide post is inserted into the transverse through groove, there are gaps between the left and right sides of the guide post and the left and right sidewalls of the transverse through groove.

[0022] In this embodiment, the fine-tuning component includes a longitudinal screw 8 and two lateral screws 3. The lower end of the longitudinal screw passes through the transverse through slot via a guide post. The same-side ends of the two lateral screws pass through the transverse through slot in a direction perpendicular to the longitudinal screw and are pressed against the opposite outer walls of the guide post.

[0023] In this embodiment, a rectangular hole 9 is formed in the middle of the guide post. The rectangular hole is vertically continuous. The longitudinal screw is inserted from the top of the rectangular hole until it is inserted into the inner wall of the transverse through groove on the other side. The width of the rectangular hole is adapted to the outer diameter of the longitudinal screw, and the length is greater than the outer diameter of the longitudinal bolt.

[0024] The process of using this invention is as follows:

[0025] When using this invention, as Figure 3 As shown, the operator inserts the end of the camshaft to be clamped into the through hole. After the end of the clamping block is embedded in the groove made of the camshaft, the expansion joint can be tightened with locking bolts. Then, the fixing block with the camshaft fixed can be moved to the fixed position of the finishing equipment for assembly. After assembly, the operator can use longitudinal and transverse screws to fine-tune the position of the fixing block to the tool position and trial machining structure of the finishing equipment until a suitable state is achieved before proceeding with the actual machining process.

[0026] In this invention, the original tooling structure is still used for radial clamping and fixing. The clamping block is embedded in the longitudinal through groove, and in its protruding state, it is embedded in the groove, thereby restricting the axial position of the camshaft. At the same time, the circumferential rotation of the camshaft is also restricted. Compared with existing clamps, this tooling provides positioning in three directions, resulting in better positioning performance.

[0027] In this invention, a transverse through-slot, guide post, longitudinal screw, and two lateral screws are used to fix the fixing block in a general direction, while allowing for orderly fine-tuning within a small range. The transverse through-slot, with its rectangular structure of a rectangular groove and guide post, restricts the circumferential rotation of the fixing block relative to the guide post. Because the thickness of the rectangular hard block and the height of the through-slot are well-matched, the vertical movement of the guide post is effectively limited, but lateral adjustment is still possible. The longitudinal screw, in conjunction with the rectangular hole made in the guide post, is used to adjust the front-to-back position of the fixing block. After both the front-to-back and lateral positions are adjusted, the block is securely fixed by the lateral screws on both sides. After clamping the camshaft to be machined, the corresponding feed and machining positions can be adjusted by fine adjustments to the positions of the fixing block and guide post.

Claims

1. A cam fixture for camshaft grinding, comprising a camshaft to be fixed and a fixture assembly, the fixture assembly including a fixing block, one end of which has a through hole, and an expansion notch integrally formed between the lower end of the through hole and the bottom surface of the fixing block, wherein a locking bolt is inserted between the fixing blocks on both sides of the expansion notch, characterized in that: A longitudinal through groove is integrally formed on the inner wall of the through hole along the radial direction of the through hole. A locking block is embedded in the longitudinal through groove. When the end of the locking block is in the lower position, it protrudes from the inner wall of the through hole. The outer wall of the end of the camshaft is formed with a groove that matches the protruding part of the locking block. A transverse through groove is formed on the end of the fixed block where no through hole is formed. The transverse through groove is parallel to the axial direction of the through hole. A guide post is inserted in the transverse through groove. A fine adjustment component is installed on the outside of the guide post. The other end of the guide post is used for movable installation with the cam grinder drive device. The transverse through-slot is a rectangular slot, and the guide post is a rectangular rigid block. The thickness of the rectangular rigid block is adapted to the height of the through-slot, and the width of the rectangular rigid block is smaller than the width of the through-slot. When the guide post is inserted into the transverse through-slot, there is a gap between the left and right sides of the guide post and the left and right sidewalls of the transverse through-slot. The fine-tuning component includes a longitudinal screw and two lateral screws. The lower end of the longitudinal screw passes through the transverse through-slot via the guide post, and the same-side ends of the two lateral screws pass through the transverse through-slot in a direction perpendicular to the longitudinal screw and are pressed against the opposite outer walls of the guide post. A rectangular hole is formed in the middle of the guide post, which runs vertically through the center. The longitudinal screw is inserted from the top of the rectangular hole until it enters the inner wall of the transverse through groove on the other side. The width of the rectangular hole is adapted to the outer diameter of the longitudinal screw, and its length is greater than the outer diameter of the longitudinal bolt. A slotted hole is formed inside the card block, and a limiting pin is fixedly installed in the middle of the slotted hole. A compression spring is installed between the limiting pin and the lower end of the slotted hole. The compression spring pushes out the lower end of the card block in a non-elastic state.

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