Camshaft center drilling structure and use method thereof

Abstract

The present invention provides a camshaft center drilling structure and a method of using the same, comprising a turning handle, a drill bit, a locking nut, an adjusting nut, a bearing and a retaining ring. The turning handle is a stepped shaft, and the small diameter of the stepped shaft sequentially penetrates the locking nut, the adjusting nut and the bearing and then extends into the retaining ring. A drill bit is arranged in the small diameter of the stepped shaft, and the drill bit penetrates the retaining ring and extends to the outside. The locking nut is connected to the adjusting nut, and the other end of the adjusting nut is connected to the bearing, and the bearing is connected to the retaining ring. The turning handle and the locking nut, and the turning handle and the adjusting nut are all connected by threads. The camshaft center drilling structure of the present invention and the method of using the same and the method of using the same are easy to use, have high processing precision, are highly practical, have good stability, are convenient for mass production, have a long service life, and can better improve economic benefits.

Description

Technical Field

[0001] The invention relates to a drilling structure and a use method thereof, and in particular to a camshaft center drilling structure and a use method thereof. Background Art

[0002] The camshaft is an important component in a piston engine. Its function is to control the opening and closing of the valves. Figure 5 When processing the non-standard top hole of the German cam rod, the core size is b. Since the hole is the reference for the axial position size of the cam rod, the hole has very high shape size and error. The size b is not only highly precise but also cannot be accurately measured, which makes processing more difficult. In reality, it is also difficult to detect using the "cutting method". Summary of the invention

[0003] [1] Technical issues to be solved

[0004] The technical problem to be solved by the present invention is to provide a camshaft center drilling structure which is easy to use, has high processing precision, good stability, is convenient for mass production and has a long service life, and a use method thereof.

[0005] 【2】Technical solutions to solve the problem

[0006] The present invention provides a camshaft center drilling structure comprising a turning handle 1, a drill bit 2, a locking nut 3, an adjusting nut 4, a bearing 5 and a retaining ring 7. The turning handle 1 is a stepped shaft, and the minor diameter of the stepped shaft sequentially penetrates the locking nut 3, the adjusting nut 4 and the bearing 5 and then extends into the retaining ring 7. The drill bit 2 is arranged in the minor diameter of the stepped shaft, and the drill bit 2 penetrates the retaining ring 7 and extends to the outside. The locking nut 3 is connected to the adjusting nut 4, and the other end of the adjusting nut 4 is connected to the bearing 5, and the bearing 5 is connected to the retaining ring 7. The turning handle 1 and the locking nut 3, as well as the turning handle 1 and the adjusting nut 4 are all connected by threads.

[0007] Furthermore, a gap is left between the bearing 5 and the retaining ring 7, and a gasket 6 is provided in the gap.

[0008] Furthermore, the adjusting nut 4 is a conical nut, and the conical surface of the conical nut is connected to the locking nut 3 .

[0009] Furthermore, the retaining ring 7 is provided with a through hole 71 , a first through groove 72 and a second through groove 73 .

[0010] Furthermore, there are six through holes 71 , six first through slots 72 , and six second through slots 73 , and the through holes 71 , the first through slots 72 , and the second through slots 73 are uniformly distributed in the circumferential direction around the axis of the retaining ring 7 .

[0011] Furthermore, the surface of the retaining ring 7 is nitrided.

[0012] Furthermore, the method for using the camshaft center drilling structure is characterized by comprising the following steps:

[0013] A. Assemble the handle 1, drill bit 2, locking nut 3, adjusting nut 4, bearing 5, gasket 6 and retaining ring 7 in order;

[0014] B. Check the axial position of the retaining ring 7. There are three specific methods: the first method is the vernier caliper alignment method, the second method is the correction sleeve end face alignment method, and the third method is the sleeve transverse edge light alignment method;

[0015] C. Drilling: Drilling can be carried out after calibration is completed.

[0016] Furthermore, in step b, the sleeve transverse blade light transmission alignment method is preferably used.

[0017] 【3】Beneficial effects

[0018] The camshaft center drilling structure and the use method thereof are easy to use, have high machining accuracy, are highly practical, have good stability, are convenient for mass production, have a long service life, and can better improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the camshaft center drilling structure of the present invention;

[0020] Figure 2 It is a left side view of the camshaft center drilling structure of the present invention;

[0021] Figure 3 This is an enlarged view of part A of the camshaft center drilling structure of the present invention;

[0022] Figure 4 An exploded view of the camshaft center drilling structure of the present invention;

[0023] Figure 5 This is a processing parts drawing of the camshaft center drilling structure of the present invention. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0025] See also Figures 1 to 5The present invention provides a camshaft center drilling structure and a method for using the same, including a turning handle 1, a drill bit 2, a locking nut 3, an adjusting nut 4, a bearing 5 and a retaining ring 7. The turning handle 1 is a step shaft, and an external thread structure is arranged on the minor diameter of the step shaft. The minor diameter of the step shaft sequentially penetrates the locking nut 3, the adjusting nut 4 and the bearing 5 and then extends into the retaining ring 7. A drill bit 2 is arranged inside the minor diameter of the step shaft, and the drill bit 2 penetrates the retaining ring 7 and then extends to the outside. The locking nut 3 is connected to the adjusting nut 4, and the other end of the adjusting nut 4 is connected to the bearing 5, and the bearing 5 is connected to the retaining ring 7. The turning handle 1 and the locking nut 3, as well as the turning handle 1 and the adjusting nut 4 are all connected by threads. The inner half of the locking nut 3 is provided with an internal thread structure matching the external thread structure on the minor diameter of the step shaft, and the other half is provided with an internal thread structure matching the external thread structure on the minor diameter of the step shaft. The nut 4 is a smooth structure; further in the present embodiment, the adjusting nut 4 is a conical nut, and the conical nut in the present embodiment adopts a 5# Morse taper. The internal thread of the conical nut matches the external thread structure on the minor diameter of the step shaft, and the conical surface of the conical nut is connected to the smooth structure of the locking nut 3. This method can ensure that after slightly loosening the locking nut 3, the adjusting nut 4 can be fine-tuned. The locking nut 3 can be tightened when the adjusting nut 4 is in place. There will never be a change in the axial position of the adjusting nut 4 when tightening the locking nut 3, thereby ensuring the axial setting accuracy of the adjusting nut 4 very well; in order to prevent the iron produced during drilling from entering the bearing 5, thereby affecting the service life of the bearing 5, in the present embodiment, the bearing 5 and the retaining There is a gap between the retaining rings 7, and a gasket 6 is arranged in the gap; in the present embodiment, a through hole 71, a first through groove 72 and a second through groove 73 are provided on the retaining ring 7, and there are six through holes 71, the first through groove 72 and the second through groove 73, and the through holes 71, the first through groove 72 and the second through groove 73 are uniformly distributed around the axis of the retaining ring 7 in the circumferential direction. Since the center drill discharge groove will discharge more processing iron chips into the retaining ring 7 (because of the guiding effect of the iron chip groove of the drill bit), the retaining ring 7 is designed with radial chip discharge holes, and the chip discharge holes can also be designed to discharge chips forward or backward. However, in this case, the radial distribution of the chip discharge holes is the best choice, because the radial chip discharge holes are more conducive to the chip discharge of its structure under the action of centrifugal force, and the front end chip discharge may discharge the iron chips discharged by it. The chips will damage the surface quality and shape size of the tapered hole of the product. It can even be said that the damage to the quality of the tapered hole by the front end discharge of the iron chips is an inevitable result. In order to increase the service life of the retaining ring 7, the surface of the retaining ring 7 is nitrided. The method of using the camshaft center drilling structure is as follows: A. Assemble the handle 1, drill bit 2, locking nut 3, adjusting nut 4, bearing 5, gasket 6 and retaining ring 7 in order; B. Check the axial position of the retaining ring 7 to ensure that the retaining ring 7 is not tilted during installation. There are three specific methods. The first method is the vernier caliper alignment method. This method uses a vernier caliper 8 to directly measure the diameter of the drill bit 2 for data comparison. The disadvantage of the vernier caliper alignment method is that it will produce test errors and reading errors during measurement.The second method of aligning the end face of the correction sleeve is based on touch. As long as the adjusting nut 4 is manually adjusted so that the two end faces of the retaining ring 7 and the first sleeve 10 fit together, the locking nut 3 can be tightened. The disadvantage of this method is that it will cause some human errors if it relies solely on touch. The third method of aligning the sleeve transverse blade through light is based on vision. The retaining ring 7 and the end face of the second sleeve 9 are fitted together, and the fitting part is illuminated with light. As long as the blade edge transmits purple light in all four directions to the obliquely incident light, it means that the axial position of the retaining ring 7 has been adjusted to the right position. At this time, the locking nut 3 can be tightened. In this embodiment, the sleeve transverse blade through light alignment method is preferred. For quality assurance personnel, this method can also be used to conduct necessary monitoring and inspection of its processing process; C. Drilling. Drilling can be carried out after the calibration is completed. ;

[0026] The following is a detailed description of the method of using the present invention in conjunction with this embodiment. First, according to the size of the required drilling hole, such as Figure 5 : a is the diameter of the bottom hole, b is the diameter of the large hole at the outer end, and the tolerance requirement is ±0.2mm, c is the depth of the bottom hole, d is the angle between the bottom hole and the large hole at the outer end, and the tolerance requirement is ±4°. The coaxiality requirement between the diameter a of the bottom hole and the diameter b of the large hole at the outer end is 0.1. Prepare the corresponding drill bit 2, and then adjust the axial position of the retaining ring 7 through the sleeve cross-blade light alignment method after clamping the drill bit 2. Use the limit measuring instrument to ensure that the drill bit 2 meets the depth c of the bottom hole. After that, tighten the locking nut 3 and then start drilling.

[0027] It should also be pointed out that the outer diameter of the center drilling structure retaining ring 7 of the present invention is larger than the outer diameter of the required drilling camshaft, and different specifications of tapered hole end diameters can be processed while keeping the inner diameter of the straight hole the same. In addition, when the surface quality of the tapered hole of the processed product decreases due to tool wear, the tool contour and cutting edge can be repeatedly repaired and reused, thereby effectively reducing the tool cost.

[0028] The camshaft center drilling structure and the use method thereof are easy to use, have high machining accuracy, are highly practical, have good stability, are convenient for mass production, have a long service life, and can better improve economic benefits.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A camshaft center drilling structure, characterized in that: The invention comprises a rotating handle (1), a drill bit (2), a locking nut (3), an adjusting nut (4), a bearing (5) and a retaining ring (7), wherein the rotating handle (1) is a stepped shaft, the small diameter of the stepped shaft passes through the locking nut (3), the adjusting nut (4) and the bearing (5) in sequence and then extends into the retaining ring (7), the drill bit (2) is arranged in the small diameter of the stepped shaft, the drill bit (2) passes through the retaining ring (7) and then extends to the outside, the locking nut (3) is connected to the adjusting nut (4), and the other end of the adjusting nut (4) is connected to the The invention relates to a bearing (5), wherein the bearing (5) is connected to the retaining ring (7), the turning handle (1) and the locking nut (3), and the turning handle (1) and the adjusting nut (4) are connected via threads, the inner half of the locking nut (3) is provided with an internal thread structure matching the external thread structure on the minor diameter of the stepped shaft, and the other half is a smooth structure; a gap is left between the bearing (5) and the retaining ring (7), a gasket (6) is provided in the gap, and the adjusting nut (4) is a conical nut, and the conical surface of the conical nut is connected to the locking nut (3).

2. The camshaft center drilling structure according to claim 1, characterized in that: The retaining ring (7) is provided with a through hole (71), a first through groove (72) and a second through groove (73).

3. The camshaft center drilling structure according to claim 2, characterized in that: There are six through holes (71), six first through grooves (72) and six second through grooves (73), and the through holes (71), the first through grooves (72) and the second through grooves (73) are evenly distributed in the circumferential direction around the axis of the retaining ring (7).

4. The camshaft center drilling structure according to claim 1, characterized in that: The surface of the retaining ring (7) is nitrided.

5. The method for using the camshaft center drilling structure according to any one of claims 1 to 4, characterized in that: The following steps are involved: A. Assemble the handle (1), drill bit (2), lock nut (3), adjustment nut (4), bearing (5), gasket (6) and retaining ring (7) in order; B. Check the axial position of the retaining ring (7). There are three specific methods: the first method is to use a vernier caliper to align the position, the second method is to use a correction sleeve end face to align the position, and the third method is to use a sleeve transverse edge to align the position through light. C. Drilling: Drilling can be carried out after calibration is completed.

6. The method for using the camshaft center drilling structure according to claim 5, characterized in that: In step b, the sleeve transverse blade light transmission alignment method is preferably used.

Images