Cam shaft with novel key groove structure

Abstract

The utility model discloses a cam shaft with a novel key groove structure, which belongs to the field of cam shafts and comprises a shaft body, a plurality of cam bodies are fixedly connected outside the shaft body, a shaft neck part is arranged at the right end of the shaft body, a key groove body is arranged on the top surface of the shaft neck part, and the shaft neck part is fixedly connected to the right end of the shaft body through a connecting mechanism. The arranged connecting mechanism is used in cooperation with the upper cam shaft, after the key groove body on the journal part is abraded or damaged, the journal part can be replaced so as to achieve the purpose that the abraded or damaged key groove body can be replaced in time, the cam shaft has the function of disassembling, assembling and replacing the key groove body, and by means of the mode, the key groove body can be disassembled, assembled and replaced conveniently. And the key groove bodies in different shapes can be installed on the cam shaft, so that the applicability of the cam shaft is improved, the key groove bodies do not need to be repaired in a time-consuming and labor-consuming mode or the whole cam shaft does not need to be replaced, the maintenance cost of the cam shaft is reduced, and normal use of the cam shaft is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to camshaft field, especially a camshaft with novel keyway structure. BACKGROUND

[0002] Camshaft is a component in piston engine. Its function is to control the opening and closing action of the valve. Although the camshaft speed is half of the crankshaft speed in four-stroke engine (in two-stroke engine, the camshaft speed is the same as the crankshaft speed), but usually its speed is still very high, and needs to bear very big torque, so the design has very high requirements on the strength and support of the camshaft, and its material is usually high-quality alloy steel or alloy steel. Since the valve motion law is related to the power and running characteristics of an engine, therefore, the camshaft design occupies a very important position in the engine design process.

[0003] Camshaft keyway is a key feature on the camshaft, which is usually a clamping groove, designed to accurately and firmly connect the camshaft to the crankshaft or other transmission components of the engine.

[0004] In the prior art, the keyway of the camshaft is generally provided on the journal of the camshaft, and the camshaft keyway will be subjected to load continuously after long-term use, and gradually appear fatigue problems, especially in high-load running engines, the fatigue problem will be more obvious, eventually leading to keyway damage. However, since the existing journal with keyway is generally an integral structure with the camshaft, it is difficult to directly replace the keyway by the journal when the keyway is worn or damaged, and various ways are generally used for repair or direct replacement of the entire camshaft. But the keyway repair is time-consuming and laborious, and the direct replacement of the entire camshaft is costly, thereby not only increasing the maintenance cost of the camshaft, but also affecting the normal use of the camshaft. SUMMARY

[0005] The main purpose of the utility model is to provide a camshaft with a novel keyway structure, which can effectively solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is:

[0007] The utility model provides a camshaft with novel keyway structure, including the shaft body, the outside fixed connection of the shaft body has a plurality of cam body, and the right end of shaft body is equipped with the journal part, the top surface of journal part is equipped with the keyway body, the journal part is fixedly connected in the right end of shaft body through the connecting mechanism, and the connecting mechanism includes the connecting seat, screw short pole, movable block and limit rod, the connecting seat is fixedly connected in the right end of shaft body, and screw short pole is movably connected in the right end of connecting seat through the rotary rod of outside end, movable block is movably connected in the right end wall of connecting seat through the slide of upper and lower surface, and movable block is movably connected with screw short pole through the nut in the outside wall, limit rod is fixedly connected on the inside wall of movable block.

[0008] Preferably, a group of symmetrical positioning rods are fixedly installed on the left end wall of the journal part, and a group of symmetrical limiting holes are further formed on the outer wall of the journal part.

[0009] Preferably, the connecting seat is fixedly installed on the right end of the shaft body, and an insertion slot is formed on the right end wall of the connecting seat, and a group of symmetrical positioning holes corresponding to the positioning rods are formed on the bottom surface of the insertion slot.

[0010] Preferably, a group of left-right symmetrical transverse openings are formed on the right end wall of the connecting seat, and a slide groove is formed on the top surface and the bottom surface of the transverse opening, a rotating hole is formed on the left side wall of the transverse opening, and a connecting hole in communication with the insertion slot is further formed on the right side wall of the transverse opening.

[0011] Preferably, a rotary rod is fixedly installed on the outside end of the screw short pole, and the rotary rod is movably installed in the rotating hole, and a knob is fixedly installed on the outside end of the rotary rod.

[0012] Preferably, the movable block is movably installed in the transverse opening, and a slide is fixedly installed on the top surface and the bottom surface of the movable block, the slide is movably installed in the slide groove, a through hole is formed on the outside wall of the movable block, a nut is fixedly installed in the hole opening of the through hole and is screwed together with the screw short pole through the nut, the limit rod is fixedly installed on the inside wall of the movable block, and the limit rod is inserted into the limiting hole through the connecting hole.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The utility model discloses a connecting mechanism cooperation upper camshaft's use, after the keyway body on the shaft neck part appears abrasion or damage, rotates the knob and drives screw short pole rotation through rotating link, and the movable block moves along the screw short pole outside direction through the nut in the through -hole, until the limit rod removes from the limiting hole, and the shaft neck part is taken out from the slot, and then the new shaft neck part with the keyway body is inserted into the slot through the positioning rod and cooperation upper positioning hole, and then the knob is rotated reversely and makes the movable block move inside direction, until the limit rod is inserted into the limiting hole through the connecting hole, thereby replacing the shaft neck part to reach the purpose of replacing the keyway body of abrasion or damage in time, the camshaft has the function of disassembling and replacing the keyway body, and by this mode, different shape keyway bodies can be installed on the camshaft, the applicability of the camshaft is improved, the keyway body does not need to be repaired or the whole camshaft to be replaced, thereby not only reduce the maintenance cost of the camshaft, and guarantee the normal use of the camshaft. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic diagram of the utility model;

[0016] Figure 2 It is the whole structure schematic diagram of the shaft neck part of the utility model;

[0017] Figure 3 It is the whole structure schematic diagram of the connecting mechanism of the utility model;

[0018] Figure 4 It is the structure split schematic diagram of the connecting mechanism of the utility model.

[0019] In the drawing: 1, shaft body;2, cam body;3, shaft neck part;4, keyway body;5, connecting mechanism;6, positioning rod;7, limiting hole;8, connecting seat;9, slot;10, positioning hole;11, transverse mouth;12, sliding slot;13, rotating hole;14, connecting hole;15, screw short pole;16, rotating link;17, knob;18, movable block;19, slide;20, through -hole;21, nut;22, limit rod. PREFERRED EMBODIMENT

[0020] In order to make the technical means, creation features, purposes and effects realized by the utility model easy to understand, the utility model is further described below in combination with specific embodiments.

[0021] For example, Figure 1 - Figure 4As shown, a camshaft with a novel keyway structure includes a shaft body 1, a plurality of cam bodies 2 fixedly connected to the outside of the shaft body 1, and a journal 3 provided at the right end of the shaft body 1. A keyway body 4 is provided on the top surface of the journal 3. The journal 3 is fixedly connected to the right end of the shaft body 1 by a connecting mechanism 5, and the connecting mechanism 5 includes a connecting seat 8, a threaded short rod 15, a movable block 18 and a limiting rod 22. The connecting seat 8 is fixedly connected to the right end of the shaft body 1, and the threaded short rod 15 is movably connected to the right end of the connecting seat 8 by a rotating rod 16 at the outer end. The movable block 18 is movably connected to the right end wall of the connecting seat 8 by upper and lower sliding strips 19, and the movable block 18 is also movably connected to the threaded short rod 15 by a nut 21 in the outer wall. The limiting rod 22 is fixedly connected to the inner wall of the movable block 18.

[0022] like Figure 2 As shown, a set of symmetrical positioning rods 6 are fixedly installed on the left end wall of journal 3. Journal 3 can be positioned and installed on connecting seat 8 by positioning rods 6. A set of symmetrical limiting holes 7 are also provided on the outer wall of journal 3. The limiting holes 7 are used to cooperate with limiting rod 22 to limit and fix journal 3.

[0023] like Figure 3 As shown, the connecting seat 8 is fixedly installed on the right end of the shaft 1, and a slot 9 is provided on the right end wall of the connecting seat 8. A set of symmetrical positioning holes 10 corresponding to the positioning rod 6 are provided on the bottom surface of the slot 9. After the positioning rod 6 is inserted into the positioning hole 10, the journal 3 can be positioned and inserted into the slot 9.

[0024] like Figure 4 As shown, a set of symmetrical horizontal openings 11 are provided on the right end wall of the connecting seat 8. The horizontal openings 11 can realize the horizontal movement of the movable block 18. The top and bottom surfaces of the horizontal openings 11 are provided with sliding grooves 12. The sliding grooves 12 can cooperate with the slider 19 to realize the sliding operation. The left side wall of the horizontal opening 11 is provided with a rotating hole 13. The rotating hole 13 can cooperate with the rotating rod 16 to realize the rotation operation. The right side wall of the horizontal opening 11 is also provided with a connecting hole 14 communicating with the slot 9. The connecting hole 14 can ensure that the limiting rod 22 enters into the limiting hole 7 or moves out of the limiting hole 7.

[0025] like Figure 4 As shown, a rotating rod 16 is fixedly installed on the outer end of the threaded short rod 15, and the rotating rod 16 is movably installed in the rotating hole 13. A knob 17 is fixedly installed on the outer end of the rotating rod 16. Manually rotating the knob 17 can drive the rotating rod 16 to rotate in the rotating hole 13, and the rotating rod 16 can drive the threaded short rod 15 to rotate.

[0026] like Figure 4As shown, the movable block 18 is movably installed in the transverse opening 11, and the top and bottom surfaces of the movable block 18 are fixedly installed with sliding bars 19, which are movably installed in the sliding groove 12. The outer side wall of the movable block 18 is provided with a through hole 20, and the through hole 20 is fixedly installed with a nut 21 and is screwed together with the threaded short rod 15. The limiting rod 22 is fixedly installed on the inner side wall of the movable block 18 and is inserted into the limiting hole 7 through the connecting hole 14. The movable block 18 can move in the inward direction along the threaded short rod 15 through the nut 21 in the through hole 20, and the sliding bar 19 slides in the sliding groove 12 until the limiting rod 22 is inserted into the limiting hole 7 through the connecting hole 14, so as to install the shaft neck part 3, and after the subsequent keyway body 4 is worn or damaged, the shaft neck part 3 can be disassembled and assembled to replace the keyway body 4.

[0027] The specific use principle of the connecting mechanism 5 cooperating with the camshaft is as follows:

[0028] When the keyway body 4 on the shaft neck part 3 needs to be replaced due to wear or damage, the knob 17 located on the outer wall of the connecting seat 8 at the right end of the shaft body 1 is rotated, the knob 17 drives the rotating rod 16 to rotate in the rotating hole 13, the rotating rod 16 drives the threaded short rod 15 to rotate in the transverse opening 11, the movable block 18 moves in the outward direction along the threaded short rod 15 in the transverse opening 11 through the nut 21 installed in the through hole 20 on the outer side wall, and the sliding bars 19 installed on the top and bottom surfaces of the movable block 18 slide in the sliding groove 12, while the threaded short rod 15 enters the through hole 20, until the limiting rod 22 installed on the inner side wall of the movable block 18 moves out of the limiting hole 7 on the outer wall of the shaft neck part 3 and moves into the connecting hole 14, then the shaft neck part 3 with the worn or damaged keyway body 4 is taken out of the connecting seat 8 installed at the right end of the shaft body 1, then the shaft neck part 3 with the new keyway body 4 or the shaft neck part 3 with the keyway body 4 of different shapes is installed at the right end of the shaft body 1, when installing, the positioning rod 6 on the left end wall of the shaft neck part 3 is inserted into the limiting hole 7 in the limiting slot 9 at the right end wall of the connecting seat 8, after the shaft neck part 3 is positioned and inserted into the limiting slot 9, the knob 17 is reversely rotated to drive the threaded short rod 15 to rotate through the rotating rod 16, so that the movable block 18 moves in the inward direction along the threaded short rod 15 through the nut 21, until the limiting rod 22 is inserted into the limiting hole 7 on the outer wall of the shaft neck part 3 through the connecting hole 14, and the knob 17 cannot be rotated any more, so that the disassembly and replacement of the keyway body 4 or the installation of the keyway body 4 of different shapes on the camshaft is completed, so that the keyway body 4 structure of the new type has the purpose of being disassembled and replaced on the camshaft, and the applicability of the camshaft is improved, without wasting time and effort to repair the keyway body 4 or replace the entire camshaft, thereby not only reducing the maintenance cost of the camshaft, but also ensuring the normal use of the camshaft.

[0029] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, various modifications and changes can be made without departing from the scope of the present application, or equivalent substitutes for the components thereof can be used, or some of the technical features thereof can be replaced with equivalent substitutes, and all of these should be included in the scope of the present application.

Claims

1. A camshaft with a novel keyway structure, comprising a shaft body (1), the outer part of the shaft body (1) is fixedly connected with a plurality of cam bodies (2), and the right end of the shaft body (1) is provided with a journal portion (3), the top surface of the journal portion (3) is provided with a keyway body (4), characterized in that: The shaft journal (3) is fixedly connected with the right end of the shaft body (1) through a connecting mechanism (5), and the connecting mechanism (5) comprises a connecting seat (8), a threaded short rod (15), a movable block (18) and a limiting rod (22), the connecting seat (8) is fixedly connected with the right end of the shaft body (1), the threaded short rod (15) is movably connected with the right end of the connecting seat (8) through a rotating rod (16) at the outer end, the movable block (18) is movably connected with the right end wall of the connecting seat (8) through slide bars (19) at the top and bottom, and the movable block (18) is movably connected with the threaded short rod (15) through nuts (21) in the outer side wall, and the limiting rod (22) is fixedly connected with the inner side wall of the movable block (18).

2. A camshaft with a new type of keyway structure according to claim 1, characterized in that: A plurality of symmetrical positioning rods (6) are fixedly installed on the left end wall of the shaft journal (3), and a plurality of symmetrical limiting holes (7) are formed in the outer wall of the shaft journal (3).

3. A camshaft with a new type of keyway structure according to claim 2, characterized in that: The connecting seat (8) is fixedly installed on the right end of the shaft body (1), and a slot (9) is formed in the right end wall of the connecting seat (8), and a plurality of symmetrical positioning holes (10) corresponding to the positioning rods (6) are formed in the bottom of the slot (9).

4. A camshaft with a new type of keyway structure according to claim 3, characterized in that: A plurality of left-right symmetrical transverse openings (11) are formed in the right end wall of the connecting seat (8), and slide grooves (12) are formed in the top and bottom of the transverse openings (11), a rotating hole (13) is formed in the left side wall of the transverse openings (11), and a connecting hole (14) in communication with the slot (9) is further formed in the right side wall of the transverse openings (11).

5. A camshaft with a new type of keyway structure according to claim 4, characterized in that: A rotating rod (16) is fixedly installed on the outer end of the threaded short rod (15), and the rotating rod (16) is movably installed in the rotating hole (13), and a knob (17) is fixedly installed on the outer end of the rotating rod (16).

6. A camshaft with a new type of keyway structure according to claim 5, characterized in that: The movable block (18) is movably installed in the transverse opening (11), and slide bars (19) are fixedly installed on the top and bottom of the movable block (18), the slide bars (19) are movably installed in the slide grooves (12), a through hole (20) is formed in the outer side wall of the movable block (18), and a nut (21) is fixedly installed in the hole and is threadedly connected with the threaded short rod (15) through the nut (21), the limiting rod (22) is fixedly installed on the inner side wall of the movable block (18), and the limiting rod (22) is inserted into the limiting hole (7) through the connecting hole (14).

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