Tensioner, chain tensioning mechanism and motorcycle

Abstract

This utility model provides a tensioner, a chain tensioning mechanism, and a motorcycle. The tensioner includes a frame comprising a straight line segment and an arc segment tangent to the straight line segment. The concave surface of the arc segment faces the straight line segment. The arc segment is configured such that, when heated, it deflects away from the straight line segment around its connection point. This application uses a tensioner with both an arc segment and a straight line segment, resulting in a simple and compact structure that is easy to install. Utilizing the characteristic of the arc segment rotating when heated, when the engine is running, the heat generated by the engine heats the arc segment of the tensioner, causing it to apply force to the chain, thus tensioning the chain. The tensioner in this application can achieve chain tensioning without requiring a complex mechanical structure and can be installed in locations with limited space where traditional tensioners cannot be installed or where tools cannot reach.

Description

Technical Field

[0001] This utility model belongs to the field of motorcycle parts technology, specifically relating to a tensioner, a chain tensioning mechanism, and a motorcycle. Background Technology

[0002] In motorcycle engines, the oil pump chain and water pump chain often cannot be effectively tensioned due to insufficient space or internal parts, causing the chain to swing during operation, damaging nearby parts and generating noise. Utility Model Content

[0003] The purpose of this invention is to overcome the technical problem that the tensioner of a motorcycle cannot be installed and operated in a confined space, as described in the prior art.

[0004] The first aspect of this utility model provides a tensioner, comprising:

[0005] The skeleton includes at least one straight line segment and an arc segment tangent to the straight line segment, the concave surface of the arc segment facing the straight line segment, wherein the arc segment is configured such that, when heated, the arc segment deflects about its connection point with the straight line segment in a direction away from the straight line segment.

[0006] Furthermore, the skeleton is made of shape memory metal.

[0007] Furthermore, the memory metal is a one-way memory metal or a two-way memory metal.

[0008] Furthermore, the outer surface of the skeleton is covered with a protective sleeve.

[0009] Furthermore, the protective sleeve is a rubber protective sleeve or a nylon protective sleeve.

[0010] Furthermore, the protective sleeve has a wear-resistant layer on its exterior.

[0011] The second aspect of this utility model provides a chain tensioning mechanism, comprising:

[0012] Cover plate, wherein a limit block is provided on the cover plate; and

[0013] As described in any of the above embodiments, in the tensioner, the straight segment is limited by the limiting block, and the arc segment is disposed outside the limiting block for contacting the chain.

[0014] Furthermore, the surface of the limiting block is provided with an installation groove, and the straight segment is engaged in the installation groove.

[0015] The third aspect of this utility model provides a motorcycle, comprising:

[0016] engine;

[0017] First gear;

[0018] The second gear is connected to the first gear via a chain drive; and

[0019] As described in any of the above embodiments, the chain tensioning mechanism includes the cover plate, the first gear, the second gear, and the chain, all of which are installed inside the engine. The first gear is mounted on the cover plate, and the tensioner is located on one side of the chain.

[0020] Compared with existing technologies, the advantages of this invention are: It employs a tensioner with both arc and straight segments, resulting in a simple and compact structure that is easy to install. Utilizing the characteristic of the arc segment rotating when heated, the heat generated by the engine during operation heats the arc segment of the tensioner, which then applies force to the chain, thus tightening it. The tensioner in this application can achieve chain tensioning without requiring complex mechanical structures, and can be installed in locations with limited space where traditional tensioners cannot be installed or where tools cannot reach. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural schematic diagram of the motorcycle provided by this utility model;

[0023] Figure 2 This is a schematic diagram of the chain tensioning mechanism provided by this utility model;

[0024] Figure 3 This is a schematic diagram of the tensioner provided by this utility model;

[0025] Figure 4 yes Figure 3 Sectional view of AA.

[0026] Explanation of icon numbers:

[0027] 10. Engine; 20. First gear; 30. Second gear; 40. Chain; 50. Cover plate; 51. Limiting block; 60. Tensioner; 61. Frame; 611. Straight section; 612. Circular section; 62. Protective sleeve. Detailed Implementation

[0028] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0029] In the description of the embodiments of this utility model, it should be understood that if the embodiments of this utility model involve directional indications, such as up, down, left, right, front, back, inside, outside, etc., the orientation or positional relationship of the indications is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the embodiments of this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this embodiment of the invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. They can be mechanical or electrical connections. They can be direct connections or indirect connections through an intermediate medium, and can represent the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0032] like Figure 1 As shown, this application embodiment provides a motorcycle, mainly the power transmission part of the motorcycle, including an engine 10, a first gear 20, a second gear 30, a chain 40, and a chain tensioning mechanism. The first gear 20, the second gear 30, the chain 40, and the chain tensioning mechanism are disposed inside the engine 10. The first gear 20 and the second gear 30 are connected by the chain 40. The chain tensioning mechanism is used to keep the chain 40 in a tensioned state to ensure stable transmission and prevent the chain 40 from becoming loose and falling off.

[0033] like Figure 2As shown, the chain tensioning mechanism includes a cover plate 50 and a tensioner 60. The cover plate 50 is used to install on the engine 10 to cover the internal parts of the engine 10 and prevent external impurities from entering the engine 10 and affecting its operation. A limit block 51 is provided on the cover plate 50, and the tensioner 60 is installed on the limit block 51. The tensioner 60 has an open state. In the open state, the tensioner 60 abuts against the chain 40 and makes the chain 40 tensioned.

[0034] The following detailed explanation uses the tensioner 60 as an example.

[0035] Combination Figure 3 and Figure 4 This application provides a tensioner 60, including a frame 61. The frame 61 includes a straight line segment 611 and an arc segment 612 tangent to the straight line segment 611. The concave surface of the arc segment 612 faces the straight line segment 611. The arc segment 612 is configured such that when heated, it deflects away from the straight line segment 611 around its connection point with the straight line segment 611. That is, the tensioner 60 has an initial state and an open state. In the initial state, the tensioner 60 is relatively small, making it easy to install onto the limiting block 51. The arc segment 612 of the tensioner 60 abuts against the chain 40. When the engine 10 is running, the heat generated by the engine 10 heats the arc segment 612 of the tensioner 60. At this time, the tensioner 60 switches from the initial state to the open state, and the arc segment 612 applies force to the chain 40, thus tensioning the chain 40. Specifically, the convex surface of the arc segment 612 abuts against the chain 40. Because the convex surface is relatively smooth, it does not obstruct the transmission of the chain 40 when abutting against it, thus not affecting the rotation of the first gear 20 and the second gear 30. The tensioner 60 in this application can achieve the tensioning effect on the chain 40 without requiring a complex mechanical structure. It can be placed in locations where space is limited and a traditional tensioner 60 cannot be installed, or where tools cannot reach to install the tensioner 60.

[0036] In one embodiment, the limiting block 51 is installed above the chain 40, and the arcuate segment 612 of the tensioner 60 is located below the limiting block 51, with the convex surface of the arcuate segment 612 abutting against the chain 40 below. Due to the weight of the chain 40 itself, only a small force is needed to tension the chain 40 when the tensioner 60 tensions it; however, a larger force is required when the arcuate segment 612 is applied to the chain 40. The positions of the limiting block 51 and the tensioner 60 are not limited. For example, the limiting block 51 can also be installed below the chain 40, with the arcuate segment 612 of the tensioner 60 above the limiting block 51, which can be adjusted according to actual needs.

[0037] In one embodiment, the tensioner 60 includes only a straight segment 611 and an arc segment 612. A mounting groove is formed on the surface of the limiting block 51. The mounting groove is a straight groove, and its size is adapted to the straight segment 611 of the tensioner 60. That is, the straight segment 611 can be engaged in the mounting groove, and the mounting groove can limit the straight segment 611, preventing the tensioner 60 from falling off the limiting block 51. In another embodiment, the tensioner 60 also includes a connecting segment. The shape of the connecting segment is not limited; it can be wavy or other irregular shapes. This connecting segment is used to fix itself to the limiting block 51. A straight segment 611 is connected to the end of the connecting segment, and the straight segment 611 is located between the arc segment 612 and the connecting segment.

[0038] In this application, the skeleton 61 is made of shape memory metal. Shape memory metal is a smart material that can recover a preset shape within a specific temperature range. Its properties originate from the reversible phase transformation of its internal austenite and martensite crystal structure. Specifically, shape memory metals include one-way shape memory metals and two-way shape memory metals. One-way shape memory metals are given a permanent shape in the high-temperature phase (austenitic phase). When it is cooled to the low-temperature phase (martensite phase), it can be easily plastically deformed into another temporary shape. When reheated to a specific temperature (transformation temperature), the material automatically recovers to its original permanent shape. Upon cooling, it does not automatically revert to the temporary shape. In this application, the arc segment 612 of the tensioner 60 switches from its initial state to an open state under the influence of the high temperature of the engine 10; that is, the initial state is the temporary state, and the open state is the original permanent state. Two-way shape memory metals, on the other hand, not only recover from the temporary shape to the high-temperature permanent shape when heated, but also automatically change from the high-temperature shape back to another specific low-temperature shape when cooled. It can reversibly cycle between the two shapes. In other words, the tensioner 60 in this application can switch back and forth between the initial state and the open state.

[0039] To protect the frame 61 and prevent it from directly contacting the chain 40, a protective sleeve 62 is wrapped around the outer surface of the frame 61. The protective sleeve 62 can be made of rubber or nylon material, which can be selected according to the actual usage conditions.

[0040] Furthermore, wear-resistant and friction-reducing materials such as polytetrafluoroethylene can be added to the arc-shaped surface to form a wear-resistant layer, thereby preventing the chain 40 from wearing down the protective sleeve 62 due to long-term operation and shortening the service life of the protective sleeve 62.

[0041] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A tensioner, characterized in that, include: The skeleton (61) includes a straight line segment (611) and an arc segment (612) tangent to the straight line segment (611), the concave surface of the arc segment (612) facing the straight line segment (611), wherein the arc segment (612) is configured such that, when heated, the arc segment (612) deflects away from the straight line segment (611) about its connection point with the straight line segment (611).

2. The tensioner according to claim 1, characterized in that, The skeleton (61) is made of shape memory metal.

3. The tensioner according to claim 2, characterized in that, The memory metal is either a one-way memory metal or a two-way memory metal.

4. The tensioner according to any one of claims 1 to 3, characterized in that, The outer surface of the skeleton (61) is covered with a protective sleeve (62).

5. The tensioner according to claim 4, characterized in that, The protective sleeve (62) is a rubber protective sleeve (62) or a nylon protective sleeve (62).

6. The tensioner according to claim 4, characterized in that, The protective sleeve (62) has a wear-resistant layer on its exterior.

7. A chain tensioning mechanism, characterized in that, include: Cover plate (50), wherein a limit block (51) is provided on the cover plate (50); as well as In any one of claims 1 to 6, the tensioner (60) has the straight segment (611) limited by the limiting block (51) and the arc segment (612) disposed outside the limiting block (51) for abutting against the chain (40).

8. The chain tensioning mechanism according to claim 7, characterized in that, The limiting block (51) has an installation groove on its surface, and the straight segment (611) is engaged in the installation groove.

9. A motorcycle, characterized in that, include: Engine (10); First gear (20); The second gear (30) is connected to the first gear (20) via a chain (40); and In the chain tensioning mechanism as described in claim 7 or 8, the cover plate (50), the first gear (20), the second gear (30) and the chain (40) are all installed inside the engine (10), the first gear (20) is installed on the cover plate (50), and the tensioner (60) is located on one side of the chain (40).

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