Tensioning structure for chain transmission

Abstract

The invention discloses a tensioning structure for chain transmission, and belongs to the field of chain transmission. Comprising a tensioning guide rail, a mounting seat for mounting the tensioning structure and a driving part connected with the tensioning structure, the tensioning guide rail is provided with a tensioning arc face abutting against the chain. One end of the tensioning guide rail is hinged to the mounting base, and the other end of the tensioning guide rail is hinged to the output end of the driving piece. The chain tensioning device has the beneficial effects that through the arrangement of the tensioning guide rail, the chain can be tensioned in a large range, and the better tensioning degree is achieved.

Description

Technical Field

[0001] The present application relates to the field of chain transmission, and in particular to a tensioning structure for chain transmission. Background Art

[0002] The engine's layout determines product performance, reliability, and cost. Gear transmission is widely used for engine power transmission. The valves are actuated directly (or via extremely short intermediate components) by the cam itself or by short tappets / rocker arms. This significantly reduces the mass and inertia of components requiring high-speed reciprocating motion. The valvetrain can more accurately follow the cam profile at high speeds, reducing the risk of "valve lift" and allowing the engine to reach a higher speed limit, thereby achieving higher power output. However, since the camshaft is located far from the tensioning structure used for chain drive, the choice of transmission system is particularly important in this arrangement. Common transmission methods include gear drive and synchronous belt drive.

[0003] Regarding the above-mentioned related transmission structures, the inventors believe that the following defects exist: the use of traditional gear-driven camshafts will increase the number of gears, making the gear system structure complex, increasing the weight of the entire machine, raising the cost of the engine and increasing the noise. Especially for small-displacement engines, the torque required for the camshaft is small, and the use of gear transmission has more disadvantages than advantages. If the camshaft is driven by a synchronous belt, the synchronous belt is easy to wear, has a short service life, and needs to be replaced frequently, which not only increases the maintenance cost but also causes great trouble to the user. Chain transmission has less noise and weight than gear transmission, and has better reliability than synchronous belt transmission. However, the tensioning of the chain transmission will result in insufficient tensioning due to the tensioning method of the tensioning pulley. Summary of the Invention

[0004] The content of this application is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this application is not intended to identify key features or essential features of the technical solution for which protection is sought, nor is it intended to limit the scope of the technical solution for which protection is sought.

[0005] In order to solve the technical problems mentioned in the above background technology section, some embodiments of the present application provide a tensioning structure for chain transmission, including: a tensioning guide rail, a mounting seat for installing the tensioning structure, and a driving member connected to the tensioning structure; the tensioning guide rail has a tensioning arc surface abutting the chain; one end of the tensioning guide rail is hinged to the mounting seat, and the other end is hinged to the output end of the driving member.

[0006] Furthermore, a chain baffle is provided on the tensioning guide rail, and the chain baffle has a chain baffle surface which is perpendicular or inclined to the tensioning arc surface.

[0007] Furthermore, the chain baffle is arranged in the middle of the tensioning arc surface.

[0008] Furthermore, the tensioning guide rail includes a ring plate and a thin plate arranged in the middle of the ring plate; the thin plate is fixed to the ring plate; a rib plate is arranged between the ring plate and the thin plate; and the ring plate has the tensioning arc surface.

[0009] Furthermore, the chain guard is a curved plate.

[0010] Furthermore, the tensioning structure further includes: a fixed guide rail, which is fixed to the mounting seat; and the fixed guide rail has a fixed arc surface that abuts against the chain.

[0011] Furthermore, the chain is wound around a pair of sprockets; and the fixed arc surface and the tensioning arc surface are at least partially located between the pair of sprockets.

[0012] The use of a chain drive allows for a compact and simple overall structure. This rational layout facilitates component installation and the placement of other engine components, reducing engine manufacturing and maintenance costs. It also reduces engine noise and weight, improving engine reliability and lowering maintenance costs.

[0013] The beneficial effect of the present application is that, by setting the tensioning guide rail, the chain can be tensioned over a large range, with a better tensioning degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this application are used to provide a further understanding of this application and make other features, purposes and advantages of this application more apparent. The drawings and descriptions of the exemplary embodiments of this application are used to explain this application and do not constitute an improper limitation on this application.

[0015] In addition, throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that the elements and components are not necessarily drawn to scale.

[0016] In the attached figure:

[0017] Fig. 1 is an overall schematic diagram according to an embodiment of the present application;

[0018] Fig. 2 It is a structural schematic diagram of a part of the embodiment, mainly showing the structure of the tensioning guide rail.

[0019] Reference numerals:

[0020] 1. Tensioning guide rail; 11. Tensioning arc surface; 2. Mounting seat; 3. Driving member; 4. Chain baffle; 41. Chain baffle surface; 42. Thin plate; 43. Ring plate; 44. Rib plate; 5. Fixed guide rail. DETAILED DESCRIPTION

[0021] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0022] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0023] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0024] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0025] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0026] Reference Figs. 1-2 ,

[0027] A tensioning structure for chain transmission, comprising:

[0028] The tensioning guide rail 1, the mounting seat 2 for mounting the tensioning structure, and the driving member 3 connected with the tensioning structure; the tensioning guide rail 1 has a tensioning arc surface 11 abutting against the chain; one end of the tensioning guide rail 1 is hinged to the mounting seat 2, and the other end is hinged to the output end of the driving member 3. The driving member 3 in the application adopts a pneumatic cylinder, a hydraulic cylinder or an electric push rod. The movement of the utility tensioning guide rail 1 extrudes the chain, so that the chain is tensioned, wherein the tensioning guide rail 1 has the same effect as the tensioning wheel. However, the tensioning guide rail 1 can be in large-area contact with the chain, thereby having a better tensioning effect. The tensioning arc surface 11 of the tensioning guide rail 1 is coated with lubricating oil, thereby reducing the friction between the chain and the tensioning guide rail 1. The arrangement of the tensioning arc surface 11 can also ensure the adhesion of the chain to the tensioning guide rail 1, so that the chain has smaller deformation during relatively straight transmission, thereby better improving the stability of the chain transmission process.

[0029] Specifically, the tensioning guide rail 1 is provided with a chain baffle 4, and the chain baffle 4 has a chain baffle surface 41 perpendicular or inclined to the tensioning arc surface 11. The chain baffle surface 41 is used to block the side of the chain, so as to prevent the chain from deviating and better ensure the stability of the chain transmission process.

[0030] Specifically, the chain baffle 4 is arranged at the middle part of the tensioning arc surface 11. The chain baffle 4 prevents the chain from deviating at the middle part of the tensioning arc surface 11, and the deviation prevention effect is more stable.

[0031] Specifically, the tensioning guide rail 1 comprises a ring plate 43 and a thin plate 42 arranged at the middle part of the ring plate 43; the thin plate 42 is fixed to the ring plate 43; a rib plate 44 is arranged between the ring plate 43 and the thin plate 42; and the ring plate 43 has the tensioning arc surface 11. The thin plate 42 is located at the middle part of the ring plate 43, and the rib plate 44 plays a role in strengthening the connection between the ring plate 43 and the thin plate 42. The arrangement of the thin plate 42, the ring plate 43 and the rib plate 44 reduces the overall weight of the tensioning guide rail 1 and reduces the overall weight while ensuring normal strength.

[0032] Specifically, the chain baffle 4 is an arc-shaped plate.

[0033] Specifically, the tensioning structure further comprises a fixed guide rail 5 fixed to the mounting seat 2; and the fixed guide rail 5 has a fixed arc surface abutting against the chain. The fixed guide rail 5 is arranged on the opposite side of the tensioning guide rail 1, so that the fixed guide rail 5 and the tensioning guide rail 1 simultaneously tension the chain, thereby having a good tensioning degree.

[0034] Specifically, the chain is wound around a pair of sprockets; and the fixed arc surface and the tensioning arc surface 11 are both at least partially located between the pair of sprockets.

[0035] The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A tensioning structure for chain transmission, characterized in that: include: A tensioning guide rail, a mounting seat for mounting the tensioning structure, and a driving member connected to the tensioning structure; The tensioning guide rail has a tensioning arc surface that abuts against the chain; one end of the tensioning guide rail is hinged to the mounting seat, and the other end is hinged to the output end of the driving member.

2. The tensioning structure for chain transmission according to claim 1, characterized in that: A chain baffle is provided on the tensioning guide rail, and the chain baffle has a chain baffle surface which is perpendicular or inclined to the tensioning arc surface.

3. The tensioning structure for chain transmission according to claim 2, characterized in that: The chain baffle is arranged in the middle of the tensioning arc surface.

4. The tensioning structure for chain transmission according to claim 2, characterized in that: The tensioning guide rail includes a ring plate and a thin plate arranged in the middle of the ring plate; the thin plate is fixed to the ring plate; a rib plate is arranged between the ring plate and the thin plate; The ring plate has the tensioning arc surface.

5. The tensioning structure for chain transmission according to claim 2, characterized in that: The chain guard is an arc-shaped plate.

6. The tensioning structure for chain transmission according to claim 1, characterized in that: The tensioning structure further includes: a fixed guide rail, the fixed guide rail being fixed to the mounting seat; The fixed guide rail has a fixed arc surface that abuts against the chain.

7. The tensioning structure for chain transmission according to claim 6, characterized in that: The chain is wound around a pair of sprockets; the fixed arc surface and the tensioning arc surface are at least partially located between the pair of sprockets.

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