CN218669572U

CN218669572U - Chain wheel mounting structure of engine

Info

Publication number: CN218669572U
Application number: CN202223451428.7U
Authority: CN
Inventors: 郑林; 张立成; 张展彧; 金潮
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-03-21
Anticipated expiration: 2032-12-21

Abstract

The utility model provides a sprocket mounting structure of engine belongs to engine technical field. It has solved the problem of how to improve the assembly efficiency of sprocket and camshaft. Among the sprocket mounting structure of engine, the engine includes that one end has flange's camshaft, and the sprocket cover is established and is fixed at the one end that the camshaft has flange and through the fastener spiro union, and mounting structure includes the locating pin, and the constant head tank has been seted up on the sprocket towards flange's the side, the degree of depth of constant head tank is less than the thickness of sprocket, locating pin one end can be dismantled with flange and be connected, other end embedding constant head tank. This sprocket mounting structure of engine can improve the problem of the assembly efficiency of sprocket and camshaft.

Description

Chain wheel mounting structure of engine

Technical Field

The utility model belongs to the technical field of the engine, a sprocket mounting structure of engine is related to.

Background

The camshaft of the engine is in transmission connection with the crankshaft through the matching of the chain wheel and the chain, so that the requirement that each cam on the camshaft can rotate for a certain range corresponding to each stroke of the engine is met.

The sprocket generally cup joints on the camshaft and through bolt locking to this guarantees the stability of being connected of protruding sprocket and camshaft, but in actual assembling process, the installation of sprocket is positive and negative and the installation angle of sprocket all has certain requirement, and for satisfying this condition, among the prior art, the method of general adoption is: processing a plurality of positioning holes on the surface of a chain wheel, processing fixing holes on a flange plate at the end part of a camshaft, sleeving the chain wheel on the camshaft after confirming the front and back surfaces of the chain wheel, then rotating the chain wheel to continuously adjust the angle of the chain wheel, and after the installation angle of the chain wheel is kept at a proper position, screwing and fixing the chain wheel through the matching of a bolt, the positioning holes and the fixing holes; however, the installation mode is too complex, the production efficiency is low, and the assembly production of the camshaft and the chain wheel in batches is not facilitated.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a sprocket mounting structure of engine, the utility model aims to solve the technical problem that: how to improve the assembly efficiency of sprocket and camshaft.

The purpose of the utility model can be realized by the following technical proposal: the utility model provides a sprocket mounting structure of engine, engine include that one end has flange's camshaft, and the sprocket cover is established and is fixed at the one end that the camshaft has flange and through the fastener spiro union, and its characterized in that, mounting structure include the locating pin, and the constant head tank has been seted up towards the sprocket on flange's the side, the degree of depth of constant head tank is less than the thickness of sprocket, locating pin one end can be dismantled with flange and be connected, other end embedding constant head tank.

In the chain wheel installation structure of the engine, the engine comprises a cam shaft, the cam shaft and the chain wheel are fixed together through a fastening piece in a screwed mode, the connection stability is high when the assembly is ensured, the installation angle of the chain wheel is correct, a positioning pin is arranged between the chain wheel and a connecting flange, the positioning pin is fixed on the connecting flange in a detachable installation mode, the disassembly is convenient when the follow-up maintenance is ensured, meanwhile, the structural complexity of the cam shaft is reduced, the difficulty of the cam shaft in casting forming is reduced, the chain wheel is sleeved on the cam shaft, an assembler can rotate and adjust the chain wheel, the positioning pin is directly embedded into a positioning groove, the installation angle of the chain wheel can be directly adjusted in place at one time, the defect of inconvenience in installation in the prior art is effectively avoided, in addition, the depth of the positioning groove is smaller than the thickness of the chain wheel, the positioning pin can be abutted against the wall of the groove bottom of the positioning groove after being inserted into the positioning groove, the positioning pin is limited, the positioning pin is prevented from being separated from the positioning groove, a clamping ring for limiting positioning pin is not needed to be arranged on the chain wheel, limiting parts such as baffles, the structure of the cam is simplified, in addition, after the positioning pin is assembled, and the cam can also be used as the reference of each cam.

In the above-mentioned sprocket mounting structure of engine, the sprocket is discoid and the mounting opening has been seted up at the middle part, the constant head tank is rectangular form, constant head tank one end runs through the mounting opening inner wall, and the other end inner wall is the cambered surface form, just the width of constant head tank is greater than the diameter of locating pin.

The sprocket specifically is discoid and the installing port is seted up at the middle part, the sprocket specifically has flange's one end through the installing port and camshaft and cup joints, the constant head tank specifically is rectangular form, its one end and communicate with the installing port, the sprocket cup joints the in-process with the camshaft and avoids flange to carry out the closing cap with the constant head tank, insert the in-process of constant head tank with the locating pin, air in the constant head tank can outwards discharge through the one end with the installing port intercommunication, thereby guarantee that the locating pin can insert smoothly, and the other end inner wall of constant head tank is the cambered surface form, with the outer wall shape more adaptation of locating pin, the locating pin is inserting the constant head tank after, its outer wall can laminate with this end of constant head tank and be the inner wall that the cambered surface form, thereby guarantee connection stability, in addition, the width of constant head tank will be greater than the diameter of locating pin, avoid constant head tank and locating pin position to lead to the locating pin can's unable constant head tank of inserting owing to make the reason of tolerance by this.

In the sprocket mounting structure of foretell engine, the last connecting hole of having seted up of flange, and set up the air vent that the internal diameter is less than the connecting hole on the diapire of connecting hole, the locating pin joint supports mutually in the connecting hole and with the interior diapire of connecting hole and leans on.

The locating pin inlays through the mode of joint and establishes in the connecting hole of seting up on flange, because the existence of air vent on the connecting hole bottom surface, make locating pin one end at the in-process of inserting the connecting hole, the air in the connecting hole can outwards be discharged through the air vent, thereby avoid the locating pin to cause the locating pin can't insert the connecting hole because the reason of the internal gas pressure of connecting hole, in addition, because the aperture of connecting hole is greater than the aperture of air vent, make and to form between connecting hole and the connecting hole and support and lean on the step, behind the connecting hole is gone into to the locating pin card, its tip can support and lean on the step, thereby make the locating pin can firmly fix a position in the connecting hole.

In the above-mentioned sprocket mounting structure of engine, the connecting hole is towards the one end circumference inner wall chamfer of sprocket and is formed the direction edge that is the inclined plane form, just the chamfer of both ends of locating pin is the inclined plane form.

The connecting hole forms the direction edge that is the inclined plane form towards the one end circumference inner wall chamfer of sprocket, and leads along specifically being the flaring form to when inserting locating pin one end in the connecting hole, can lead to the locating pin, guarantee the installation convenience to locating pin and flange, be the inclined plane form with the both ends chamfer of locating pin simultaneously, thereby further guarantee that the locating pin inserts the connecting hole drill way, the spacing groove notch is more convenient, guarantees assembly efficiency.

In the above-mentioned chain wheel mounting structure of the engine, a groove is formed in a side surface of the chain wheel, which is provided with the positioning groove, and the positioning groove is formed in an inner bottom wall of the groove.

The recess can ensure that assembly personnel distinguish the positive and negative of sprocket more easily when assembling the sprocket, and with the constant head tank set up on the interior diapire of recess to make full use of sprocket has a notched one side space, in addition, when establishing sprocket cover on the camshaft, flange can imbed to the recess in, thereby guarantees both and remain stable under the preinstallation condition.

In the chain wheel mounting structure of the engine, the connecting flange is provided with a fixing hole, the chain wheel is provided with a positioning hole, the fastener is a bolt, and the chain wheel and the camshaft are fixed by penetrating the positioning hole through the bolt and screwing the bolt into the fixing hole.

After locating camshaft and sprocket through the locating pin, the installer can pass the locating hole of seting up on the sprocket through the bolt and twist the fixed orifices of seting up on the flange for sprocket and camshaft firmly are together fixed under the detachable prerequisite, and as the alternative, the fastener also can be for screw, threaded pin etc..

Compared with the prior art, this sprocket mounting structure of engine possesses following advantage:

this sprocket mounting structure of engine passes through locating pin and flange and sprocket epaxial constant head tank cooperation to the installation angle that realizes the sprocket once only installs in place, guarantees that assembly efficiency is higher, and in addition, the constant head tank degree of depth is less than sprocket thickness, thereby guarantees that locating pin one end can carry on spacingly through diapire in the constant head tank after inserting the constant head tank, need not to set up locating parts such as snap ring, the baffle that are used for spacing locating pin at sprocket, simplifies the sprocket structure.

Drawings

Fig. 1 is a schematic structural view of a sprocket mounting structure of the present engine.

Fig. 2 is a sectional view of the sprocket mounting structure of the present engine and a partially enlarged view thereof.

Fig. 3 is a schematic structural view of a camshaft and a partially enlarged view thereof.

Fig. 4 is a mechanism schematic of the sprocket.

Fig. 5 is a schematic view of the structure of the positioning pin.

In the figure, 1, a camshaft; 11. a connecting flange; 111. connecting holes; 1111. a vent hole; 1112. a guide edge; 112. a fixing hole; 2. a sprocket; 21. a groove; 211. positioning a groove; 22. an installation port; 23. positioning holes; 3. and a positioning pin.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1-2, in the sprocket mounting structure of the engine, the engine includes a camshaft 1, and referring to fig. 3, the camshaft 1 is in a long shape, a plate-shaped connecting flange 11 is integrally formed on an outer side wall of one end of the camshaft 1, and a sleeve portion is formed between the connecting flange 11 and the end portion of the camshaft 1, referring to fig. 4, the sprocket 2 is in a disc shape, a mounting opening 22 penetrating through side surfaces of both sides of the sprocket 2 is formed in a middle portion of the sprocket, the sprocket 2 is sleeved on the camshaft 1 through the mounting opening 22 and the sleeve portion in a matching manner, an annular groove 21 is formed in one side of the sprocket 2 facing the connecting flange 11, and when the sprocket 2 is sleeved on one end of the camshaft 1, the connecting flange 11 can be embedded into the groove 21 and attached to an inner bottom wall of the groove 21.

As shown in fig. 3, the connecting flange 11 is provided with a connecting hole 111, the bottom wall of the connecting hole 111 is provided with a vent 1111 penetrating through the lower side surface of the connecting flange 11, as shown in fig. 4, the inner bottom wall of the groove 21 is provided with a positioning groove 211 in a long strip shape, and in combination with fig. 5, the sprocket mounting structure of the engine comprises a positioning pin 3, one end of the positioning pin 3 is clamped into the connecting hole 111 and abuts against the inner bottom wall of the connecting hole 111, and the other end of the positioning pin extends out of the connecting hole 111 and is embedded into the positioning groove 211.

As shown in fig. 3, the inner wall of the connecting hole 111 facing the sprocket 2 in the circumferential direction is chamfered to form a guiding edge 1112 in a form of an inclined plane, so that the connecting hole 111 facing the sprocket 2 in the circumferential direction is flared, as shown in fig. 4, one end of the positioning groove 211 penetrates through the inner wall of the mounting opening 22, and the inner wall of the other end is ground in a form of an arc surface.

As shown in fig. 1 to 4, two symmetrically arranged fixing holes 112 are formed in the connecting flange 11, two symmetrically arranged positioning holes 23 corresponding to the fixing holes 112 in one-to-one correspondence are formed in the sprocket 2, and the camshaft 1 and the sprocket 2 are fixed by passing through the positioning holes 23 and screwing into the fixing holes 112 through bolts.

The assembly principle is as follows: after the positioning pin 3 is clamped and positioned in the connecting hole 111, the chain wheel 2 is sleeved at one end, provided with the connecting flange 11, of the camshaft 1 through the mounting hole 22, then the chain wheel 2 is rotated to position the positioning pin 3 and the positioning groove 211, the chain wheel 2 is pressed to enable the positioning pin 3 to be embedded into the positioning groove 211, and then the camshaft 1 and the chain wheel 2 are fixed together through the positioning hole 23 and the fixing hole 112 in a screwed mode through bolts.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms of the camshaft 1, the attachment flange 11, the attachment hole 111, the ventilation hole 1111, the guide rim 1112, the fixing hole 112, the sprocket 2, the groove 21, the positioning groove 211, the mounting opening 22, the positioning hole 23, the positioning pin 3, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims

1. The utility model provides a sprocket mounting structure of engine, engine include that one end has camshaft (1) of flange (11), and it is fixed through the fastener spiro union that sprocket (2) cover is established in camshaft (1) one end that has flange (11), and its characterized in that, mounting structure include locating pin (3), and constant head tank (211) have been seted up on sprocket (2) towards the side of flange (11), the degree of depth of constant head tank (211) is less than the thickness of sprocket (2), locating pin (3) one end can be dismantled with flange (11) and be connected, other end embedding constant head tank (211).

2. The sprocket mounting structure of the engine according to claim 1, wherein the sprocket (2) has a disk shape with a mounting opening (22) formed at the center, the positioning groove (211) has one end penetrating through the inner wall of the mounting opening (22) and the other end having an arc shape, and the width of the positioning groove (211) is larger than the diameter of the positioning pin (3).

3. The sprocket mounting structure of an engine according to claim 1 or 2, wherein the attachment flange (11) is provided with an attachment hole (111), and a bottom wall of the attachment hole (111) is provided with a vent hole (1111) having an inner diameter smaller than that of the attachment hole (111), and the positioning pin (3) is engaged in the attachment hole (111) and abuts against an inner bottom wall of the attachment hole (111).

4. The sprocket mounting structure of the engine according to claim 3, wherein the attachment hole (111) is chamfered to form a guide edge (1112) in an inclined plane shape toward one end circumferential inner wall of the sprocket (2), and both ends of the positioning pin (3) are chamfered in an inclined plane shape.

5. The sprocket mounting structure of the engine according to claim 3, wherein a side surface of the sprocket (2) having the positioning groove (211) is provided with a groove (21), and the positioning groove (211) is provided on an inner bottom wall of the groove (21).

6. The sprocket mounting structure of an engine according to claim 1 or 2, wherein the connecting flange (11) is provided with a fixing hole (112), the sprocket (2) is provided with a positioning hole (23), the fastening member is a bolt, and the sprocket (2) and the camshaft (1) are fixed by passing the bolt through the positioning hole (23) and screwing the bolt into the fixing hole (112).