CN213540569U

CN213540569U - Positioning structure of top dead center of engine crankshaft

Info

Publication number: CN213540569U
Application number: CN202022808499.2U
Authority: CN
Inventors: 邓定红; 金潮; 张立成; 张林江; 潘江伟
Original assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Current assignee: Zhejiang Qianjiang Motorcycle Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-06-25
Anticipated expiration: 2030-11-27

Abstract

The utility model provides a location structure of engine crankshaft top dead center belongs to engine technical field. It has solved the problem of current location structure location difficulty. This location structure of engine crankshaft top dead center, including the box with set up the bent axle in the crankcase, the through-hole has been seted up along the bent axle axial to the box, this location structure including wear to establish the setting element on the through-hole and set up the positioning groove on bent axle, when the bent axle rotates the top dead center in the tip embedding positioning groove of setting element one end. The positioning structure of the top dead center of the engine crankshaft reduces the installation difficulty and improves the loading and unloading efficiency of the positioning structure.

Description

Positioning structure of top dead center of engine crankshaft

Technical Field

The utility model belongs to the technical field of the engine, a location structure of engine crankshaft top dead center is related to.

Background

The phase correspondence requirement of a crankshaft and a valve actuating mechanism of the existing engine is high, during the production and assembly process of the engine, the crankshaft assembly needs to be assembled firstly, then the valve actuating mechanism needs to be assembled, and when the valve actuating mechanism is assembled, the crankshaft cannot rotate and the crankshaft is located at the top dead center position, so that the corresponding phase of the valve actuating mechanism can be ensured to be matched and aligned with the crankshaft. At present, after a crankshaft and a crankshaft pulley are assembled, a mark is made on the crankshaft pulley to be aligned with a mark point on a front housing, a piston of a rear cylinder is positioned at a top dead center after the crankshaft and the crankshaft pulley are aligned, the piston is observed and determined through manual eyes, time is consumed for manual determination, unstable factors exist, the alignment is possibly inaccurate or missed, and assembly errors are caused.

In view of the above problems, various positioning structures for the top dead center of the crankshaft of the engine have been developed:

the Chinese patent application (201520953710.6) discloses an engine cylinder piston top dead center locking structure, which comprises a cylinder body, a cylinder piston and a crankshaft which are installed in the cylinder body, a crankshaft balance block is connected below the cylinder piston, the crankshaft balance block is sleeved on the crankshaft through a crankshaft installation hole, a blind hole is formed in the left end face of the crankshaft balance block, a through hole is formed in the left end face of the cylinder body, when the cylinder piston is located at the top dead center, the through hole coincides with the axis of the blind hole, at the moment, a lock pin penetrates through the through hole and is inserted into the blind hole, and top dead center locking of the cylinder piston is completed.

Although can avoid the assembly error of manual proofreading production, the blind hole has been seted up on the adoption on bent axle balancing piece left end face, pass the lockpin through the through-hole and insert in the blind hole, the lockpin is through laminating mutually with the blind hole pore wall and to the crankshaft location, and the error appears when the lockpin in the production process, the lockpin appears easily and can't insert in the blind hole, or the lockpin is too little the condition of rocking in the blind hole, the precision between lockpin and the blind hole is higher this moment, thereby the lockpin has leaded to lockpin and blind hole must high accuracy cooperation, and then the assembly degree of difficulty of locking structure has.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a location structure of engine crankshaft top dead center, the utility model discloses the technical problem that will solve is: how to solve the problem of the positioning difficulty of the existing positioning structure.

The purpose of the utility model can be realized by the following technical proposal:

the utility model provides a location structure of engine crankshaft top dead center, includes the box and sets up the bent axle in the crankcase, its characterized in that, the through-hole has been seted up along the bent axle axial to the box, and this location structure is including wearing to establish the setting element on the through-hole and seting up the positioning groove on bent axle, and in the tip embedding positioning groove of setting element one end when the bent axle rotates the top dead center.

The working principle is as follows: through having seted up the through-hole on the box, and the through-hole is seted up along the axial of bent axle, the setting element is worn to establish on the through-hole, when the bent axle rotates the top dead center, the one end of setting element can the axial imbed in the positioning groove, and fix a position the bent axle, because the setting element sets up along the bent axle axial, the tip embedding positioning groove of setting element this moment, support the bent axle axial tightly through the setting element, and it is spacing to circumference through the positioning groove cell wall, because the setting element has the spacing of two directions to the bent axle, the setting element only imbeds in the positioning groove this moment, positioning structure also can dismantle when not needing to use, and the lateral wall that does not need the setting element is laminated with positioning groove's cell wall, thereby make positioning structure's location comparatively simple, positioning structure's handling efficiency has been promoted.

In the above positioning structure for the top dead center of the engine crankshaft, the crankshaft includes a crankshaft handle block, the outer edge of the crankshaft handle block is provided with a limit step, the positioning groove is formed along the radial direction of the crankshaft handle block, and the positioning groove is formed in the limit step.

The setting of spacing step, and positioning groove be along the radial seting up of crank handle piece for positioning groove's cell wall width has a process that increases progressively, and then in the embedding positioning groove that the tip of setting element can be quick, and the tip of setting element carries out circumference spacing through the positioning groove cell wall, and the setting of spacing step can reduce the area of contact of setting element tip and positioning groove cell wall, and then reduces the installation degree of difficulty of setting element.

In the positioning structure of the top dead center of the engine crankshaft, one end of the positioning groove, which is close to the outer edge of the crank handle block, is open, a first limiting surface and a second limiting surface are arranged on two side walls of the positioning groove, the second limiting surface is close to the outer edge of the crank handle block, and the top end of the first limiting surface is higher than the top end of the second limiting surface.

The top of spacing first face is higher than spacing second face, and spacing second face mainly plays the guide effect, reduces the lateral wall of setting element and the area of contact between the spacing second face for the setting element is faster to be embedded into positioning groove, has promoted the assembly efficiency of setting element, and spacing first plays the circumference limiting displacement to the setting element, has avoided the setting element to deviate from positioning groove, has improved the stability of setting element location.

In the positioning structure of the top dead center of the engine crankshaft, the side wall of the positioning groove is provided with a fan-shaped positioning surface, and the positioning surface is arranged between the first two limiting surfaces.

The structure reduces the contact area between the side wall of the positioning piece and the positioning surface, so that the contact surface between the positioning piece and the groove wall of the positioning groove is further reduced in the installation process, and the assembly stability of the positioning piece is further improved.

In the positioning structure of the top dead center of the engine crankshaft, the positioning piece is a positioning bolt, the through hole is a threaded hole, and the positioning bolt is in threaded connection with the box body through the through hole.

The setting element is positioning bolt for setting element's setting is more stable, has increased location structure's the stability to the bent axle location.

In the positioning structure of the upper dead point of the engine crankshaft, the positioning bolt is sleeved with the sealing washer, and the positioning bolt presses the sealing washer on the outer wall of the box body and is in threaded connection with the box body.

Due to the arrangement of the sealing washer, when the crankshaft is positioned by the positioning bolt, the through hole can be sealed by the sealing washer, so that oil in the box body is prevented from flowing out, and the positioning stability of the positioning structure is improved.

In the positioning structure of the top dead center of the engine crankshaft, two positioning grooves are arranged, and the positioning grooves are formed in the outer edge of the crankshaft handle block.

The engine corresponds front bar jar and back jar, consequently need set up two positioning groove and fix a position the bent axle, has promoted the convenience that location structure used.

In the positioning structure of the top dead center of the engine crankshaft, the positioning piece is a locking pin shaft, and the locking pin shaft is clamped with the box body.

The locating piece is a locking pin shaft, so that the locating piece and the box body are more convenient to connect.

Compared with the prior art, this location structure of engine crankshaft top dead center has the advantage: set the top through with spacing first face to be higher than spacing second face, spacing second face mainly plays the guide effect for the setting element is faster to be embedded into positioning groove, has promoted the assembly efficiency of setting element, and spacing first face has avoided the setting element to deviate from positioning groove, has improved the stability of setting element location.

Drawings

Fig. 1 is a front view of the positioning structure of the top dead center of the crankshaft of the engine.

Fig. 2 is a sectional view taken along a-a in fig. 1.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic structural view of a crankshaft in the present engine.

Fig. 5 is a partially enlarged view at B in fig. 4.

Fig. 6 is a front view of a crankshaft in the present engine.

FIG. 7 is a schematic structural diagram of the assembly of a positioning member and a sealing washer in the positioning structure of the top dead center of the crankshaft of the engine.

In the figure, 1, a box body; 11. a through hole; 2. a crankshaft; 21. a positioning groove; 21a, a first limiting surface; 21b, a second limiting surface; 21c, a positioning surface; 22. a crank shank block; 22a, a limiting step; 3. a positioning member; 4. a gasket is provided.

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.

Example one

As shown in FIG. 1, the positioning structure for top dead center of engine crankshaft comprises a box body 1 and a crankshaft 2 arranged in the box of the crankshaft 2.

Specifically, as shown in fig. 1-7, the case 1 is provided with a through hole 11 along the axial direction of the crankshaft 2, the positioning structure includes a positioning element 3 penetrating the through hole 11 and a positioning groove 21 provided on the crankshaft 2, and when the crankshaft 2 rotates to the top dead center, the end of one end of the positioning element 3 is embedded into the positioning groove 21.

The working principle is as follows: through arranging the through hole 11 on the box body 1, and the through hole 11 is arranged along the axial direction of the crankshaft 2, the positioning element 3 is arranged on the through hole 11 in a penetrating way, when the crankshaft 2 rotates to the top dead center, one end of the positioning element 3 can be embedded into the positioning groove 21 in the axial direction and positions the crankshaft 2, because the positioning element 3 is arranged along the axial direction of the crankshaft 2, the end part of the positioning element 3 is embedded into the positioning groove 21 at the moment, the crankshaft 2 is pressed tightly in the axial direction through the positioning element 3 and is limited in the circumferential direction of the groove wall of the positioning groove 21, because the positioning element 3 has two-direction limit on the crankshaft 2, the positioning element 3 is only embedded into the positioning groove 21 at the moment, the positioning structure can be detached when not needed, the side wall of the positioning element 3 is not needed to be attached to the groove wall of the positioning groove 21, thereby the positioning of the, the installation difficulty of the positioning structure is reduced.

As shown in fig. 4 to 6, the crankshaft 2 includes a crank block 22, the outer edge of the crank block 22 has a limiting step 22a, the positioning groove 21 is formed along the radial direction of the crank block 22, and the positioning groove 21 is partially formed in the limiting step 22a, one end of the positioning groove 21 close to the outer edge of the crank block 22 is open, both side walls of the positioning groove 21 have a first limiting surface 21a and a second limiting surface 21b, the second limiting surface 21b is close to the outer edge of the crank block 22, the top end of the first limiting surface 21a is higher than the top end of the second limiting surface 21b, the side wall of the positioning groove 21 has a fan-shaped positioning surface 21c, the positioning surface 21c is disposed between the first limiting surfaces 21a, two positioning grooves 21 are formed in the outer edge of the crank block 22, and the positioning grooves 21 are formed in the outer edge of the crank block 22.

As shown in fig. 2, 3 and 7, the positioning element 3 is a positioning bolt, the through hole 11 is a threaded hole, the positioning bolt is in threaded connection with the box body 1 through the through hole 11, a sealing washer 4 is sleeved on the positioning bolt, and the positioning bolt compresses the sealing washer 4 on the outer wall of the box body 1 and is in threaded connection with the box body 1.

Example two

The content of this embodiment is substantially the same as that of the first embodiment, and the difference is that: the positioning piece 3 is a locking pin shaft which is clamped with the box body 1.

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.

Claims

1. The utility model provides a location structure of engine crankshaft top dead center, includes box (1) and sets up bent axle (2) at bent axle (2) incasement, its characterized in that, through-hole (11) have been seted up along bent axle (2) axial in box (1), and this location structure is including wearing to establish setting element (3) on through-hole (11) and offering positioning groove (21) on bent axle (2), in the tip embedding positioning groove (21) of setting element (3) one end when bent axle (2) rotate the top dead center.

2. The positioning structure of the top dead center of the crankshaft of the engine as claimed in claim 1, wherein the crankshaft (2) includes a crank block (22), the crank block (22) has a limit step (22a) at an outer edge thereof, the positioning groove (21) is opened in a radial direction of the crank block (22), and the positioning groove (21) is partially opened at the limit step (22 a).

3. The positioning structure of the top dead center of the crankshaft of the engine according to claim 2, wherein one end of the positioning groove (21) close to the outer edge of the crankshaft block (22) is open, a first limiting surface (21a) and a second limiting surface (21b) are arranged on two side walls of the positioning groove (21), the second limiting surface (21b) is close to the outer edge of the crankshaft block (22), and the top end of the first limiting surface (21a) is higher than the top end of the second limiting surface (21 b).

4. The positioning structure of the top dead center of the engine crankshaft as claimed in claim 3, wherein the side wall of the positioning groove (21) has a positioning surface (21c) with a fan shape, and the positioning surface (21c) is disposed between the first limiting surfaces (21 a).

5. The positioning structure of the top dead center of the engine crankshaft according to any one of claims 1 to 4, wherein the positioning member (3) is a positioning bolt, the through hole (11) is a threaded hole, and the positioning bolt is in threaded connection with the box body (1) through the through hole (11).

6. The positioning structure of the top dead center of the engine crankshaft according to claim 5, characterized in that the positioning bolt is sleeved with a sealing gasket (4), and the positioning bolt presses the sealing gasket (4) on the outer wall of the box body (1) and is in threaded connection with the box body (1).

7. The positioning structure of the top dead center of the crankshaft of the engine as claimed in any one of claims 1 to 4, wherein there are two positioning grooves (21), and the positioning grooves (21) are opened at the outer edge of the crank shank (22).

8. The positioning structure of the top dead center of the engine crankshaft according to any one of claims 1 to 4, wherein the positioning member (3) is a locking pin, and the locking pin is clamped with the box body (1).