CN219220542U - Combined assembly type cam shaft - Google Patents

Abstract

The application relates to a combination assembled camshaft, it relates to the technical field of engine accessory, including a plurality of axis bodies, a plurality of the axis body is end to end in proper order, be equipped with the cam on the axis body, the both ends of axis body all are equipped with the fixed block, axis body one end the spread groove has been seted up on the fixed block, the axis body other end be equipped with the connecting block on the fixed block, be equipped with the fixed key on the connecting block, a plurality of fixed slots have been seted up on the cell wall of spread groove, and a plurality of the fixed slot is followed the circumference setting of fixed block, the connecting block inserts in the spread groove of adjacent axle center, just the fixed key with the fixed slot cooperatees. The cam angle assembly device has the advantages that the cam angle assembly accuracy is improved, and the cam shaft assembly efficiency is improved.

Description

Combined assembly type cam shaft

Technical Field

The application relates to the technical field of engine accessories, in particular to a combined assembly type cam shaft.

Background

The camshaft is a component in a piston engine. Its function is to control the opening and closing actions of the valve. The camshaft operates at a high rotational speed, is subjected to cyclic impact loads, and is required to withstand high torque. The camshaft has high requirements in terms of strength and support, is usually forged from high-quality carbon steel or alloy steel, and can be cast from alloy cast iron or ductile iron. The journal and cam working surfaces are heat treated and polished.

A combined camshaft in the related art comprises a shaft body and cams pressed on the shaft body in pairs, knurls are arranged on the outer wall of the shaft body at the pressing positions corresponding to the cams, and then the cams are pressed on the shaft body in sequence. The press-fitting reliability of the cam on the shaft body is improved through knurling, the torsion resistance of the cam shaft is improved, and the cam shaft is simple in structure, ingenious in design and remarkable in functional effect.

For the related art, the inventor finds that the conventional press-fitting mode is generally adopted to mount the cam at present, the relative angle of the cam needs to be realized by manually adjusting the cam clamp, the assembly efficiency is low, the precision of the cam is difficult to ensure, and the angular adjustment of the mounted cam can damage the connection strength of the interference fit, so that the torsion resistance of the cam is poor.

Disclosure of Invention

In order to solve the problem that the accuracy of the cam is difficult to guarantee during installation, the application provides a combined assembly type cam shaft.

The application provides a combination assembled camshaft adopts following technical scheme:

the utility model provides a combination assembled camshaft, includes a plurality of axis bodies, a plurality of the axis body is end to end in proper order, be equipped with the cam on the axis body, the both ends of axis body all are equipped with the fixed block, axis body one end set up the spread groove on the fixed block, the axis body other end be equipped with the connecting block on the fixed block, be equipped with the fixed key on the connecting block, a plurality of fixed slots have been seted up on the cell wall of spread groove, and a plurality of the fixed slot is followed the circumference setting of fixed block, the connecting block inserts in the spread groove of adjacent axle center, just the fixed key with the fixed slot cooperatees.

Through adopting above-mentioned technical scheme, the cam of fixed connection on the axis body corresponds the valve on the engine cylinder, and the staff can select the axis body of corresponding quantity according to the valve quantity of engine cylinder group to assemble. Compared with the conventional press-mounting cams, the cam press-mounting device has the advantages that multiple groups of cams on the same shaft body are required to be subjected to angle adjustment, the shaft body is segmented, and the cam press-mounting device does not need to be subjected to angle adjustment when a single shaft body is press-mounted with the cams, so that the assembly efficiency of the cams is improved. The connecting block is inserted in the connecting groove on the adjacent shaft body, and the staff inserts the fixed key into the fixed groove of corresponding angle according to the relative angle of cam installation to improve the precision of cam angle installation and improved camshaft assembly's efficiency.

Optionally, the shaft body is adjacent through fixed subassembly fixed connection, fixed subassembly includes a plurality of arc pieces and a plurality of stopper, the stopper is located on the intrados of arc piece, set up on the fixed block and supply a plurality of arc piece male constant head tank, just the arc piece with the cell wall butt of constant head tank, set up on the cell wall of constant head tank and supply stopper male spacing groove, and the stopper with the cell wall butt of spacing groove.

Through adopting above-mentioned technical scheme, the stopper on the arc piece inserts in the spacing groove on the fixed block to make the arc piece carry out the pull joint to two fixed blocks on the adjacent axis body and fix, thereby make to connect fixedly to two adjacent axis bodies.

Optionally, a threaded surface is arranged on the outer cambered surface of the arc-shaped block, a sleeve is arranged on the shaft body, and the sleeve is in threaded connection with the arc-shaped block.

Through adopting above-mentioned technical scheme, sleeve pipe and joint arc piece threaded connection on the fixed block for fixed between sleeve pipe and the arc piece, thereby make difficult separation between the arc piece, and then improved the steadiness of being connected between the adjacent axis body.

Optionally, a knurled surface is arranged on the shaft body, and the cam is in interference fit with the knurled surface.

By adopting the technical scheme, the knurled surface is arranged on the shaft body, so that the friction force between the shaft body and the cam is improved, the press-fitting reliability of the cam on the shaft body is improved, and the torsion resistance of the cam is improved.

Optionally, the shaft body is hollow setting, be equipped with the enhancement subassembly that is used for improving self intensity in the shaft body.

Through adopting above-mentioned technical scheme, the axis body cavity sets up, has alleviateed self weight to accord with the design requirement of engine lightweight, set up the enhancement subassembly in the axis body, be used for improving self structural strength, make the axis body be difficult for the condition that warp appears by oneself when high-speed rotation, and then improved the holistic life of camshaft.

Optionally, the reinforcing component includes axle center and a plurality of flange board, the one end of flange board with the axle center is connected, the flange board keep away from the one end of axle center with the inner wall fixed connection of axis body, the flange board is followed the length direction of axis body sets up, and a plurality of flange board is followed the global setting of axle center.

By adopting the technical scheme, the axle center has stronger rigidity, and the flange plate supports the inner wall of the axle body, so that the axle body is not easy to deform, and the structural strength of the axle body is improved.

Optionally, fixedly connected with fixed plate on the fixed block, the fixed plate with flange plate butt, wear to be equipped with the bolt on the axis body, the bolt passes fixed plate and flange plate, the bolt wears out the one end threaded connection of axis body has the nut, the nut with axis body butt.

Through adopting above-mentioned technical scheme, fixed plate and flange plate butt to the relative position between fixed block and the axis body has been determined, makes fixed block and axis body coaxial fixed, and fixed plate and flange plate pass through bolt fixed connection, with fixed connection between make fixed block and the axis body, the fixed block of the fixed slot that still is convenient for the staff to change has different central angles, and then has improved the suitability of camshaft.

Optionally, a bearing is coaxially fixed at one end of the shaft body, and a driving wheel is coaxially fixed at one end of the shaft body away from the bearing.

Through adopting above-mentioned technical scheme, the bearing of axis body one end and the bearing frame fixed connection on the engine to can confirm the mounted position of camshaft on the engine, and the bearing can reduce the frictional force of axis body when rotating, improve rotation efficiency. The driving wheel is connected with a driving wheel on the engine and is used for driving the shaft body to rotate.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the fixed slots are formed in the slot walls of the connecting slots, the fixed keys are arranged on the connecting blocks, the connecting blocks are inserted into the connecting slots on the adjacent shaft bodies, and workers can insert the fixed keys into the fixed slots with corresponding angles according to the relative angles of cam installation, so that the cam angle installation precision is improved, and the camshaft assembly efficiency is improved;

2. the adjacent shaft bodies are connected through the fixing component, and the limiting blocks on the arc blocks are inserted into the limiting grooves on the fixing blocks, so that the arc blocks are used for fixedly connecting the two fixing blocks on the adjacent shaft bodies, and the two adjacent shaft bodies are connected and fixed.

Drawings

FIG. 1 is a schematic view of the overall structure of a modular camshaft according to an embodiment of the present application.

Fig. 2 is a schematic structural view of a shaft body in an embodiment of the present application.

Fig. 3 is a schematic structural diagram of the connection of the shaft body and the fixing block in the embodiment of the present application.

Fig. 4 is a schematic structural view of a fixing assembly according to an embodiment of the present application.

Reference numerals illustrate: 1. a shaft body; 11. a cam; 12. knurling the surface; 13. a bearing; 14. a driving wheel; 2. a fixed block; 21. a connecting groove; 22. a connecting block; 23. a fixed key; 24. a fixing groove; 25. a positioning groove; 26. a limit groove; 27. a fixing plate; 28. a bolt; 29. a nut; 3. a fixing assembly; 31. an arc-shaped block; 32. a limiting block; 33. a thread surface; 34. a sleeve; 4. a reinforcement assembly; 41. an axle center; 42. and a flange plate.

Detailed Description

The present application is described in further detail below in conjunction with figures 1-4.

The embodiment of the application discloses a combined assembly type cam shaft. Referring to fig. 1, a combined assembled camshaft includes a plurality of shaft bodies 1 connected end to end in sequence, and two cams 11 are fixedly connected to each shaft body 1, and the two cams 11 are arranged in parallel along the length direction of the shaft body 1. The cam 11 corresponds to a valve on an engine cylinder, and rotation of the cam 11 is used to control valve closure of the engine cylinder. The staff chooses corresponding quantity of shaft bodies 1 according to the valve quantity of the engine cylinder group to assemble the camshaft, and in the embodiment, three shaft bodies 1 are arranged. One end of the shaft body 1 is coaxially fixed with a bearing 13, the bearing 13 is fixedly connected with a bearing seat on the engine and used for supporting the shaft body 1 and determining the installation position of the shaft body 1, and the bearing 13 can reduce the friction force of the shaft body 1 during rotation and improve the rotation efficiency. One end of the shaft body 1 far away from the bearing 13 is coaxially fixed with a driving wheel 14, and the driving wheel 14 is connected with a driving wheel on an engine and is used for driving the shaft body 1 to rotate so as to drive the cam 11 to rotate and control the closing of an air valve on an engine cylinder.

Referring to fig. 2, a knurled surface 12 is provided on the outer wall of the shaft body 1, and the cam 11 is in interference fit with the knurled surface 12, so that friction between the shaft body 1 and the cam 11 is increased, reliability of mounting the cam 11 on the shaft body 1 is improved, and torsion resistance of the cam 11 is improved. In the process of press-fitting the cam 11 onto the shaft body 1, multidimensional ultrasonic vibration is introduced, so that the press-fitting force required by the cam 11 can be effectively reduced, the press-fitting quality of the cam 11 is further improved, and the connection strength between the shaft body 1 and the cam 11 is improved.

Referring to fig. 2, fixing blocks 2 are coaxially fixed to both ends of the shaft body 1, a connection groove 21 is formed in the fixing block 2 at one end of the shaft body 1, and the connection groove 21 is formed along the length direction of the fixing block 2. A connecting block 22 is coaxially fixed on the fixed block 2 at the other end of the shaft body 1, the connecting block 22 is inserted into the connecting groove 21 of the fixed block 2 on the adjacent shaft body 1, and the connecting block 22 is abutted with the groove wall of the connecting groove 21. The groove wall of the connecting groove 21 is provided with a plurality of fixing grooves 24, the fixing grooves 24 are arranged along the length direction of the fixed block 2, the plurality of fixing grooves 24 are distributed along the circumferential direction of the fixed block 2, and the central angle between the fixing grooves 24 can be set according to the relative angle of the cams 11 of the adjacent shaft bodies 1 on the cam shaft. The connecting block 22 is fixedly connected with a fixed key 23, and the fixed key 23 is matched with the fixed groove 24. The staff inserts the fixed key 23 into the fixed groove 24 of the corresponding angle according to the relative angle of the installation of the cam 11, thereby being capable of limiting the relative installation angle of the cam 11 on the adjacent shaft body 1, and further improving the installation accuracy of the cam 11.

Referring to fig. 3, in order to meet the design requirement of engine weight reduction, the shaft body 1 is hollow, and the self weight can be reduced. The shaft body 1 is internally provided with the reinforcing component 4, and the reinforcing component 4 is used for improving the structural strength of the shaft body 1, so that the shaft body 1 is difficult to deform. The reinforcing component 4 includes an axle center 41 and a plurality of flange plates 42, in this embodiment, four flange plates 42 are provided, one end of each flange plate 42 is fixedly connected with the axle center 41, and the four flange plates 42 are uniformly arranged along the peripheral surface of the axle center 41. One end of the flange plate 42, which is far away from the axle center 41, is fixedly connected with the inner wall of the shaft body 1, and the axle center 41 and the flange plate 42 are both arranged along the length direction of the shaft body 1. Because the axle center 41 has stronger rigidity, the flange plate 42 supports the inner wall of the axle body 1, and the lateral rigidity of the axle body 1 is improved, so that the structural strength of the axle body 1 is improved, and the axle body 1 is not easy to deform when being subjected to torque force in high-speed rotation.

Referring to fig. 2 and 3, a plurality of fixing plates 27 are fixedly connected to the fixing blocks 2, in this embodiment, four fixing plates 27 are fixedly connected to each fixing block 2, and four fixing plate 27 arrays are disposed at one ends of the fixing blocks 2 far away from the connecting grooves 21 or the connecting blocks 22, every two fixing plates 27 are in a group, every two fixing plates 27 are used for clamping the flange plate 42, the fixing plates 27 are abutted to the flange plate 42, so that the relative positions between the fixing blocks 2 and the shaft body 1 are limited, and the connection accuracy of the fixing blocks 2 and the shaft body 1 is improved. When the shaft bodies 1 rotate, torque is transmitted between the adjacent shaft bodies 1 through the fixing plates 27 and the flange plates 42, and the shaft center 41 receives most of the torque force, so that the shaft bodies are difficult to deform under torsion. The shaft body 1 is penetrated with a bolt 28, the bolt 28 penetrates through the fixing plate 27 and the flange plate 42, one end of the bolt 28 penetrating out of the shaft body 1 is connected with a nut 29 in a threaded manner, and the nut 29 is abutted with the shaft body 1. The shaft body 1 and the fixed block 2 are detachably connected through the bolts 28 and the nuts 29, so that workers can conveniently replace the fixed block 2 with the fixed grooves 24 with different central angles, and accordingly, the workers can adjust the relative angles between the cams 11 on the adjacent shaft bodies 1 by inserting the fixed keys 23 into the fixed grooves 24 with corresponding angles, and the assembly accuracy of the cam shafts can be improved.

Referring to fig. 4, two adjacent shaft bodies 1 are fixedly connected through a fixing component 3, the fixing component 3 comprises a plurality of arc blocks 31, a plurality of limiting blocks 32 and a sleeve 34, two arc blocks 31 are arranged in each group of fixing components 3 in the embodiment, two limiting blocks 32 are fixedly connected to the intrados of each arc block 31, the two limiting blocks 32 are oppositely arranged along the length direction of each arc block 31, and the limiting blocks 32 are provided with radians matched with the arc blocks 31. The fixed block 2 is provided with a positioning groove 25 for inserting the arc-shaped block 31, the groove wall of the positioning groove 25 is provided with a limiting groove 26 for inserting the limiting block 32, the limiting block 32 is abutted with the groove wall of the limiting groove 26, and the arc-shaped block 31 is abutted with the groove wall of the positioning groove 25. The outer cambered surface of the arc-shaped block 31 is provided with a threaded surface 33, the sleeve 34 is sleeved on the shaft body 1, and the sleeve 34 is in threaded connection with the arc-shaped block 31.

After the connecting block 22 is inserted into the connecting groove 21 by a worker, the two arc-shaped blocks 31 are clamped in the positioning grooves 25 on the two adjacent fixed blocks 2, and the limiting blocks 32 are inserted into the limiting grooves 26, so that the pull-connecting and fixing effects on the two adjacent fixed blocks 2 are achieved. And then the sleeve 34 is rotated, so that the sleeve 34 is in threaded connection with the two arc-shaped blocks 31, and the sleeve 34 plays a role in fixing the two arc-shaped blocks 31, so that the two adjacent fixed blocks 2 are difficult to separate, and the stability of fixing the adjacent shaft bodies 1 is improved.

The implementation principle of the combined assembly type cam shaft provided by the embodiment of the application is as follows: firstly, a worker selects a corresponding number of shaft bodies 1 according to the length of a camshaft to be assembled. And selecting the fixed block 2 with the fixed groove 24 corresponding to the round angle according to the required relative angle of the cam 11 on the cam shaft. The fixing blocks 2 are fixedly connected with the shaft body 1, and then the connection blocks 22 are inserted into the connection grooves 21 of the adjacent fixing blocks 2, so that the fixing keys 23 are inserted into the fixing grooves 24 of the corresponding angles. Finally, the two arc-shaped blocks 31 are clamped in the positioning grooves 25 on the adjacent fixed blocks 2, and then the sleeve 34 is rotated, so that the two arc-shaped blocks 31 are fixedly connected, the adjacent shaft bodies 1 are fixedly connected, and the assembly of the whole camshaft is completed.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims (8)

1. A combination assembled camshaft, characterized in that: including a plurality of axis body (1), a plurality of axis body (1) connect gradually the head and the tail, be equipped with cam (11) on axis body (1), the both ends of axis body (1) all are equipped with fixed block (2), connecting groove (21) have been seted up on fixed block (2) of axis body (1) one end, be equipped with connecting block (22) on fixed block (2) of axis body (1) other end, be equipped with dead key (23) on connecting block (22), a plurality of fixed slots (24) have been seted up on the cell wall of connecting groove (21), and a plurality of dead slot (24) are followed the circumference setting of fixed block (2), connecting block (22) are inserted in connecting groove (21) of adjacent axle center (41), just dead key (23) with dead slot (24) cooperate.

2. A modular camshaft as claimed in claim 1, wherein: adjacent through fixed subassembly (3) fixed connection between axis body (1), fixed subassembly (3) include a plurality of arc piece (31) and a plurality of stopper (32), stopper (32) are located on the intrados of arc piece (31), set up on fixed block (2) supply a plurality of arc piece (31) male constant head tank (25), just arc piece (31) with the cell wall butt of constant head tank (25), set up on the cell wall of constant head tank (25) supply stopper (32) male spacing groove (26), and stopper (32) with the cell wall butt of spacing groove (26).

3. A modular camshaft as claimed in claim 2, wherein: the novel arc-shaped shaft is characterized in that a thread surface (33) is arranged on the outer arc surface of the arc-shaped block (31), a sleeve (34) is arranged on the shaft body (1), and the sleeve (34) is in threaded connection with the arc-shaped block (31).

4. A modular camshaft as claimed in claim 1, wherein: the shaft body (1) is provided with a knurled surface (12), and the cam (11) is in interference fit with the knurled surface (12).

5. A modular camshaft as claimed in claim 1, wherein: the shaft body (1) is hollow, and a reinforcing component (4) for improving the strength of the shaft body (1) is arranged in the shaft body.

6. A modular camshaft as claimed in claim 5, wherein: the reinforcing component (4) comprises an axle center (41) and a plurality of flange plates (42), one end of each flange plate (42) is connected with the axle center (41), one end, away from the axle center (41), of each flange plate (42) is fixedly connected with the inner wall of the shaft body (1), each flange plate (42) is arranged along the length direction of the shaft body (1), and a plurality of flange plates (42) are arranged along the peripheral surface of the axle center (41).

7. A modular camshaft as claimed in claim 6, wherein: fixedly connected with fixed plate (27) on fixed block (2), fixed plate (27) with flange board (42) butt, wear to be equipped with bolt (28) on axis body (1), bolt (28) pass fixed plate (27) and flange board (42), bolt (28) are worn out one end threaded connection of axis body (1) has nut (29), nut (29) with axis body (1) butt.

8. A modular camshaft as claimed in claim 1, wherein: one end of the shaft body (1) is coaxially fixed with a bearing (13), and one end of the shaft body (1) far away from the bearing (13) is coaxially fixed with a driving wheel (14).

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