CN217539495U - Engine start chain tensioner - Google Patents
Engine start chain tensioner Download PDFInfo
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- CN217539495U CN217539495U CN202221841288.1U CN202221841288U CN217539495U CN 217539495 U CN217539495 U CN 217539495U CN 202221841288 U CN202221841288 U CN 202221841288U CN 217539495 U CN217539495 U CN 217539495U
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- tensioning
- engine
- tensioning plate
- chain
- plate
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Abstract
The utility model relates to an engine technical field for among the solution prior art, because engine start chain appears becoming flexible and reduces the problem of engine complete machine reliability, provides an engine start chain overspeed device tensioner, installs on the engine, wherein: the tensioning device comprises a tensioning plate, wherein one end of the tensioning plate is connected with a tensioning mechanism, and the other end of the tensioning plate is connected with an installation mechanism; the tensioning mechanism comprises a tensioning wheel and a pin shaft, the tensioning wheel synchronously rotates along with the chain, the pin shaft is used for riveting the tensioning wheel on the tensioning plate, and an inner hole of the tensioning wheel is in clearance fit with the pin shaft; the mounting mechanism comprises an elastic piece for driving the tensioning plate to swing, one end of the elastic piece is connected with the engine, and the other end of the elastic piece is connected with the tensioning plate.
Description
Technical Field
The utility model relates to an engine technical field specifically is engine start chain overspeed device tensioner.
Background
Motorcycles are widely used in the transportation industry as a portable, flexible, and fast-driving vehicle. At present, the engine starting mechanism of a small-displacement motorcycle generally adopts chain transmission, and compared with gear transmission, the chain transmission has the advantages of lower requirements on manufacturing and mounting precision, low cost, smaller overall size and more compact structure, and the chain can work under severe conditions, so that the chain transmission is applied to the motorcycle, the structure is greatly simplified, and the use is convenient and reliable.
However, in the working process of the chain, the pin shaft and the sleeve in the hinge not only bear large pressure, but also rotate relatively, so that the hinge is abraded, the pitch of the chain is increased, the total length of the chain is increased, the non-uniformity of movement and the dynamic load are increased, and the problems of tooth jumping, breakage and the like are caused. And after the total length of the chain is increased, the phenomena of poor meshing and chain vibration can occur due to overlarge slack side sag of the chain, so that the reliability of the whole engine is reduced, and the normal running of the motorcycle is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses it is anticipated to provide engine start chain overspeed device tensioner to solve prior art, because engine start chain appears becoming flexible and reduce the problem of engine complete machine reliability.
The utility model provides a basic scheme is: the engine starts the chain tensioner, installs on the engine, wherein: the tensioning device comprises a tensioning plate, wherein one end of the tensioning plate is connected with a tensioning mechanism, and the other end of the tensioning plate is connected with an installation mechanism;
the tensioning mechanism comprises a tensioning wheel and a pin shaft, the tensioning wheel synchronously rotates along with the chain, the pin shaft is used for riveting the tensioning wheel on the tensioning plate, and an inner hole of the tensioning wheel is in clearance fit with the pin shaft;
the mounting mechanism comprises an elastic piece for driving the tensioning plate to swing, one end of the elastic piece is connected with the engine, and the other end of the elastic piece is connected with the tensioning plate.
The basic scheme has the beneficial effects that: in this scheme, the take-up pulley is through round pin axle riveting back on the take-up pulley, because the hole and the pivot of take-up pulley are clearance fit, therefore the take-up pulley can be the pivoted in a flexible way, when the chain motion of engine, the take-up pulley can rotate along with the chain is synchronous, and installation mechanism's setting can drive the take-up pulley swing, then when the chain because of warping increase the back, the take-up pulley swings under the elastic component effect, drive the take-up pulley swing, thereby progressively take-up chain, it is reliable to have guaranteed the chain tensioning, can promote the whole reliability of engine, thereby the normal driving of motorcycle has been guaranteed.
In addition, in the scheme, the riveting connection mode has the advantages of impact resistance, shock resistance, fatigue resistance, insensitivity to stress concentration and the like, and the riveting process can effectively prevent structural deformation failure due to the fact that the pin shaft part is shaped like a cantilever beam structure and stress is mainly concentrated on the riveting point. And because the hole of take-up pulley and pivot are clearance fit, consequently when the chain motion, the take-up pulley can rotate along with the chain is synchronous, can prevent take-up pulley and chain dry friction, hoist mechanism life.
The first preferred scheme is as follows: as the optimization of basic scheme, the one end that installation mechanism was connected to the mounting panel is equipped with the mounting hole, installs the axle sleeve in the mounting hole, and axle sleeve excircle and mounting hole clearance fit. Has the beneficial effects that: in this scheme, clearance fit's mode guarantees that the tensioning plate can freely swing simple structure.
The preferred scheme II comprises the following steps: preferably, in the first preferred embodiment, the height of the pin shaft and/or the shaft sleeve is greater than the thickness of the tensioning plate. Has the advantages that: in the scheme, the arrangement that the height of the pin shaft and/or the shaft sleeve is larger than the thickness of the tensioning plate facilitates the installation of the pin shaft and/or the shaft sleeve, and the structure is simple.
The preferred scheme is three: preferably, the elastic member is a cylindrical helical torsion spring, one end of the elastic member is of a lever arm structure, and the other end of the elastic member is a hook hung on the tensioning plate. Has the advantages that: in this scheme, adopt cylinder helical torsion spring as the elastic component, when cylinder helical torsion spring resumes elastic deformation, through the swing of couple drive tensioning board, and then the tensioning chain can guarantee that the chain is in the tensioning state always to effectively prevent the not hard up quality risk that brings of chain.
The preferable scheme is four: preferably, the two ends of the tension plate are equal in height. Has the advantages that: in this scheme, the setting of tensioning plate both ends height can guarantee that the structure atress is balanced to improve the reliability of tensioning effect.
Drawings
Fig. 1 is a schematic view of an embodiment of an engine starting chain tensioner of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 isbase:Sub>A cross-sectional view A-A of FIG. 2;
fig. 4 is a schematic view of the tensioner after installation.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: tensioning wheel 1, round pin axle 2, tensioning plate 3, axle sleeve 4, elastic component 5, cylinder boss 6, chain 7, bolt 8.
The embodiment is basically as shown in the attached figures 1-3: the engine starts chain tensioner, installs on the engine, wherein: the device comprises a tensioning plate 3, wherein one end of the tensioning plate 3 is connected with a tensioning wheel 1 mechanism, and the other end of the tensioning plate 3 is connected with an installation mechanism; the tension plate 3 is equal in height at both ends.
The tensioning mechanism comprises a tensioning wheel 1 and a pin shaft 2, wherein the tensioning wheel 1 synchronously rotates along with the chain 7, the pin shaft 2 is used for riveting the tensioning wheel 1 on the tensioning plate 3, and an inner hole of the tensioning wheel 1 is in clearance fit with the pin shaft 2; the height of the pin shaft 2 is larger than the thickness of the tensioning plate 3.
The mounting mechanism comprises an elastic piece 5 for driving the tensioning plate 3 to swing, one end of the elastic piece 5 is connected with the engine, the other end of the elastic piece 5 is connected with the tensioning plate 3, a mounting hole is formed in one end of the mounting plate, which is connected with the mounting mechanism, a shaft sleeve 4 is mounted in the mounting hole, the excircle of the shaft sleeve 4 is in clearance fit with the mounting hole, and the height of the shaft sleeve 4 is greater than the thickness of the tensioning plate 3; the elastic part 5 is a cylindrical spiral torsion spring, one end of the elastic part 5 is a lever arm, and the other end of the elastic part is a hook hung on the tensioning plate 3.
The specific implementation process is as follows: as shown in fig. 4, during installation, the inner ring of the elastic member 5 is installed in the cylindrical boss 6 of the engine case, the lever arm of the elastic member 5 is clamped at one side of the boss 6 of the engine case, the hook of the elastic member 5 is hung on the tension plate 3, after the elastic member 5 is installed, the elastic member 5 stores elastic force due to torsion, and the tension plate 3 is driven to rotate after the elastic member 5 recovers elastic deformation; the tensioning plate 3 is mounted on the shaft sleeve 4 and then fastened on the box body through a bolt 8, and the tensioning plate 3 can freely rotate around the shaft sleeve 4; the tensioning wheel 1 is in direct contact with the chain 7, the tensioning wheel 1 upwards tensions the chain 7 due to clockwise rotation of the tensioning plate 3, and after the chain 7 is deformed and increased, the tensioning plate 3 gradually upwards rotates in the process of elastic deformation recovery of the elastic piece 5, so that the chain 7 can be gradually tensioned; meanwhile, the mechanism can ensure the correspondence between the central height of the chain 7 and the central height of the tension wheel 1 through the design calculation of all relevant dimensions, so that the stress of the structure is balanced, and the reliability of the tension mechanism is improved.
The chain 7 tensioning device in the embodiment is particularly suitable for a small-displacement motorcycle engine, the chain 7 is indirectly tensioned by means of the elastic force stored by the elastic piece 5, the problem that the chain 7 is loosened after being started for many times can be effectively solved, the starting structure of the engine is more reliable, the risk that the chain 7 is broken after being loosened is avoided, and the reliability of the whole engine is improved.
The above description is only for the embodiment of the present invention, and the common general knowledge of the known specific structures and characteristics in the schemes is not described herein too much, so that those skilled in the art can know all the common technical knowledge in the technical field of the present invention before the application date or the priority date, can know all the prior art in this field, and have the capability of applying the conventional experimental means before this date, and those skilled in the art can complete and implement the schemes in combination with their own capability, and some typical known structures or known methods should not become obstacles for those skilled in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be defined by the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (5)
1. The engine starts chain overspeed device tensioner installs on the engine, its characterized in that: the tensioning device comprises a tensioning plate, wherein one end of the tensioning plate is connected with a tensioning mechanism, and the other end of the tensioning plate is connected with an installation mechanism;
the tensioning mechanism comprises a tensioning wheel and a pin shaft, the tensioning wheel synchronously rotates along with the chain, the pin shaft is used for riveting the tensioning wheel on the tensioning plate, the outer surface of the tensioning wheel is a smooth surface, and an inner hole of the tensioning wheel is in clearance fit with the pin shaft;
the installation mechanism comprises an elastic piece for driving the tensioning plate to swing, one end of the elastic piece is connected with an engine, and the other end of the elastic piece is connected with the tensioning plate.
2. The engine start chain tensioner as set forth in claim 1, wherein: the tensioning plate is connected one end of the mounting mechanism is provided with a mounting hole, a shaft sleeve is mounted in the mounting hole, and the outer circle of the shaft sleeve is in clearance fit with the mounting hole.
3. The engine start chain tensioner as set forth in claim 2, characterized in that: the height of the pin shaft and/or the shaft sleeve is larger than the thickness of the tensioning plate.
4. The engine start chain tensioner as set forth in claim 3, wherein: the elastic part is a cylindrical spiral torsion spring, one end of the elastic part is of a lever arm structure, and the other end of the elastic part is a hook hung on the tensioning plate.
5. The engine starting chain tensioner as set forth in any one of claims 1-4, wherein: the two ends of the tensioning plate are equal in height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221841288.1U CN217539495U (en) | 2022-07-18 | 2022-07-18 | Engine start chain tensioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221841288.1U CN217539495U (en) | 2022-07-18 | 2022-07-18 | Engine start chain tensioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217539495U true CN217539495U (en) | 2022-10-04 |
Family
ID=83423630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221841288.1U Active CN217539495U (en) | 2022-07-18 | 2022-07-18 | Engine start chain tensioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217539495U (en) |
-
2022
- 2022-07-18 CN CN202221841288.1U patent/CN217539495U/en active Active
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