Timing chain tensioning structure, timing chain transmission system and vehicle

Abstract

The utility model relates to a timing chain tensioning structure, a timing chain transmission system and a vehicle, the timing chain tensioning structure comprises a tensioning rail, the tensioning rail comprises an arc-shaped chain guide plate, the first side of the chain guide plate is provided with a friction face matched with a chain, and the first end of the tensioning rail is used for being hinged to an engine; the tensioning wheel comprises a pivot shaft, an eccentric wheel rotationally arranged on the pivot shaft, an elastic assembly for providing rotating pre-tightening force for the eccentric wheel and a movable wheel rotationally arranged on the eccentric wheel in a sleeving mode; the movable wheel is movably connected to the second side of the chain guide plate along the outline of the second side of the chain guide plate. According to the scheme, the tensioning wheel and the tensioning rail are integrally designed, so that the assembling and manufacturing cost can be reduced, the assembling tolerance between parts is eliminated, the assembling precision of the whole machine is improved, the mounting efficiency is improved, the design of a high-pressure oil way of the hydraulic tensioner is eliminated, the space can be saved, and the design and manufacturing cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of automobile technology, and in particular to a timing chain tensioning structure, a timing chain transmission system and a vehicle. Background Art

[0002] The valve train of a car engine is an important part to ensure the normal operation of the engine. The valve train generally adopts two transmission modes, namely: timing belt drive and timing chain drive. Compared with the timing belt, the timing chain has the advantages of high structural strength and can carry higher power and torque, so it is widely used. As we all know, the layout of the timing chain system is divided into a tight side and a loose side. The guide rail is arranged on the tight side, and the tensioning rail is used on the loose side to guide and tension the timing chain.

[0003] The existing timing chain tensioning rail usually needs to be equipped with a hydraulic tensioner for tensioning, so it is necessary to additionally design a high-pressure oil circuit on the cylinder head or cylinder block of the engine to drive the hydraulic tensioner. This design will lead to complex structural design and increase the manufacturing cost of the engine. Utility Model Content

[0004] Based on this, the utility model provides a timing chain tensioning structure, a timing chain transmission system and a vehicle to solve the problem that the existing timing chain tensioning device needs to be equipped with a hydraulic tensioner high-pressure oil circuit, resulting in a complex structure and high design and manufacturing costs.

[0005] On the one hand, the utility model provides a timing chain tensioning structure, comprising:

[0006] A tensioning rail, the tensioning rail comprising an arc-shaped chain guide, a first side of the chain guide having a friction surface for cooperating with the chain, and a first end of the tensioning rail being used for being hinged to the engine;

[0007] A tensioning wheel, the tensioning wheel comprising a pivot, an eccentric wheel rotatably arranged on the pivot, an elastic component providing a rotational preload force for the eccentric wheel, and a movable wheel rotatably sleeved on the eccentric wheel;

[0008] Wherein, the movable wheel is movably connected to the second side of the chain guide along the contour of the second side of the chain guide.

[0009] In one of the embodiments, the tensioning rail further includes a guide plate bracket for providing support for the chain guide plate, and the guide plate bracket is fixedly disposed on the second side of the chain guide plate.

[0010] In one embodiment, the guide plate bracket includes a first arc-shaped plate, a second arc-shaped plate, and a plurality of connecting ribs connected between the first arc-shaped plate and the second arc-shaped plate;

[0011] The chain guide is arranged on a side of the first arc plate away from the second arc plate, and the movable wheel is slidably connected to a side of the first arc plate away from the chain guide.

[0012] In one of the embodiments, a mounting groove for accommodating the tensioning wheel is provided on the guide plate bracket.

[0013] In one of the embodiments, the mounting groove is disposed in the middle of the guide plate bracket.

[0014] In one of the embodiments, a hinge hole is provided at the first end of the guide plate bracket.

[0015] In one of the embodiments, a slide groove extending along the contour of the first arc-shaped plate is provided on a side away from the chain guide, and a sliding member matching the slide groove is provided on the outer side of the movable wheel.

[0016] On the other hand, the utility model also provides a timing chain transmission system, which includes the timing chain tensioning structure of any of the above embodiments.

[0017] In one embodiment, the timing chain drive system also includes a timing chain, a camshaft sprocket, a crankshaft sprocket and an adjustable rail.

[0018] On the other hand, the utility model further provides a vehicle, which includes the timing chain transmission system of any one of the above embodiments.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] The timing chain tensioning structure adopts a mechanical tensioning wheel to replace the hydraulic tensioner, and the high-pressure oil circuit design of the hydraulic tensioner can be eliminated, which can not only save space and reduce design and manufacturing costs, but also ensure that the tensioning rail and the chain are continuously and real-time pressed together through the tensioning wheel, so that the chain always remains in a tensioned state, ensuring the normal operation of the engine, and eliminating the risk of engine abnormalities caused by the hydraulic tensioner being unable to press against the tensioning rail due to insufficient system oil pressure. In addition, the utility model integrates the tensioning wheel and the tensioning rail into a design, which can realize the centralized supply of the entire timing chain tensioning structure, reduce assembly manufacturing costs, eliminate assembly tolerances between parts, improve the assembly accuracy of the entire machine, and improve installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of a timing chain tensioning structure in one embodiment;

[0022] Figure 2 A schematic diagram of the structure of a tensioning wheel of a timing chain tensioning structure in one embodiment;

[0023] Figure 3 Schematic diagram of the structure of a timing chain transmission system in one embodiment.

[0024] The figure marks in the drawings of the specification include: tensioning rail 1, chain guide 101, guide bracket 102, first arc plate 1021, connecting rib 1022, second arc plate 1023, tensioning wheel 2, pivot 201, elastic component 202, spring 2021, upper bracket 2022, lower bracket 2023, eccentric wheel 203, movable wheel 204, bearing 205, adjusting member 206, mounting groove 3, hinge hole 4, timing chain tensioning structure 100, chain 200, crankshaft sprocket 300, camshaft sprocket 400, adjustable rail 500. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] It should be noted that the illustrations provided in this embodiment are only used to schematically illustrate the basic concept of the present invention.

[0027] The structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportion or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0028] The directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "middle", "longitudinal", "lateral", "horizontal", "inner", "outer", "radial", "circumferential" and the like in this specification are based on the directions or positional relationships shown in the drawings and are only for the convenience of simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] The existing timing chain tensioning rail usually needs to be equipped with a hydraulic tensioner for tensioning, so an additional high-pressure oil circuit needs to be designed on the engine. This design will make the engine structure design complicated and increase the manufacturing cost of the engine.

[0030] In view of this, on the one hand, an embodiment of the utility model provides a timing chain tensioning structure, which includes:

[0031] A tensioning rail 1, the tensioning rail 1 comprises an arc-shaped chain guide 101, a first side of the chain guide 101 has a friction surface for cooperating with the chain 200, and a first end of the tensioning rail 1 is used for being hinged to the engine;

[0032] The tensioning wheel 2 includes a pivot 201, an eccentric wheel 203 rotatably disposed on the pivot 201, an elastic component 202 that provides a rotational preload force for the eccentric wheel 203, and a movable wheel 204 rotatably sleeved on the eccentric wheel 203;

[0033] The movable wheel 204 is movably connected to the second side of the chain guide 101 along the contour of the second side of the chain guide 101 .

[0034] The timing chain tensioning structure 100 provided by the embodiment of the utility model connects the movable wheel 204 of the tensioning wheel 2 to the chain guide 101 of the tensioning rail 1, and enables the movable wheel 204 to move along the contour of the second side of the chain guide 101, so that when the eccentric wheel 203 rotates around the pivot 201 under the rotational preload force applied by the elastic member, it can drive the movable wheel 204 to rotate eccentrically, and the eccentric rotation of the movable wheel 204 can move along the chain guide 101, and drive the chain guide 101 to deflect around the hinge point between the tensioning rail 1 and the engine, thereby adjusting the position of the tensioning rail 1 until the tensioning rail 1 tensions the chain 200.

[0035] Through the timing chain tensioning structure 100 of this embodiment, a mechanical tensioning wheel 2 is used to replace the hydraulic tensioner, and the high-pressure oil circuit design of the hydraulic tensioner can be eliminated, which can not only save space and reduce design and manufacturing costs, but also through the tensioning wheel 2, the tensioning rail 1 and the chain 200 can be continuously and real-time pressed together, so that the chain 200 always maintains a tensioned state, ensuring the normal operation of the engine, and eliminating the risk of engine abnormalities caused by the hydraulic tensioner being unable to press against the tensioning rail 1 due to insufficient system oil pressure. In addition, the utility model integrates the tensioning wheel 2 with the tensioning rail 1, which can realize the centralized supply of the timing chain tensioning structure 100 as a whole, reduce assembly manufacturing costs, eliminate assembly tolerances between parts, improve the assembly accuracy of the whole machine, and improve installation efficiency.

[0036] Hereinafter, the implementation scheme of the timing chain tensioning structure provided by the present utility model will be described in detail with reference to the accompanying drawings.

[0037] according to Figure 1 The timing chain tensioning structure provided by at least one embodiment of the utility model shown includes: a tensioning rail 1 and a tensioning wheel 2.

[0038] In this embodiment, the tensioning rail 1 is a moving rail in the timing chain transmission system, which is used to guide and tension the loose edge of the timing chain 200. Figure 1 The tensioning rail 1 includes a chain guide 101 and a guide bracket 102 .

[0039] The chain guide plate 101 is used to contact the chain 200 to guide the chain 200. Figure 1 The chain guide 101 is an arc-shaped plate, and the chain guide 101 has a first side and a second side, wherein the first side is the arc-shaped outer side of the chain guide 101, and the second side is the arc-shaped inner side of the chain guide 101. In this embodiment, the first side of the chain guide 101, i.e., the arc-shaped outer side, has a friction surface that cooperates with the chain 200, for example, see Figure 3 When installed, the chain 200 is arranged around a first side of the chain guide 101 .

[0040] In some embodiments, in order to ensure the limiting and guiding effect of the chain guide 101 on the chain 200, a track groove that matches the chain 200 is usually provided on one side of the friction surface of the chain guide 101. The structure is prior art and will not be described in detail in this embodiment.

[0041] In some embodiments, the chain guide 101 is made of wear-resistant material, such as ultra-high molecular weight polyethylene or engineering plastics, to ensure good use effect and improve the wear resistance and guiding function of the friction surface of the chain guide 101.

[0042] See also Figure 1 In the present embodiment, the guide bracket 102 is arranged on the second side of the chain guide 101, i.e., the side away from the friction surface, to support the chain guide 101 so as to limit the position of the chain guide 101. For example, the guide bracket 102 can be fixedly arranged on the side of the chain guide 101 away from the friction surface by means of a snap connection.

[0043] For details, see Figure 1 In this embodiment, the guide plate bracket 102 includes a first curved plate 1021, a second curved plate 1023 and a plurality of connecting ribs 1022 connected between the first curved plate 1021 and the second curved plate 1023, wherein the curved profile of the first curved plate 1021 matches the curved profile of the chain guide 101, so that the chain guide 101 can be buckled on the outer side of the first curved plate 1021 and combined with the guide plate bracket 102 to form a tensioning rail 1.

[0044] See also Figure 1In this embodiment, the first end of the guide plate bracket 102 is provided with a hinge hole 4. Thus, during installation, the guide plate bracket 102 can be hingedly connected to the engine through the hinge hole 4 at the first end and the pin shaft, so that the tensioning rail 1 can swing around its first end, so as to adjust its position during use to achieve tensioning of the chain 200. The first end of the guide plate bracket 102 can be understood as Figure 1 The lower end of the guide plate support 102 is shown.

[0045] In this embodiment, the tensioning wheel 2 is integrated on the tensioning rail 1 to apply a pre-tightening force to the tensioning rail 1 so that the tensioning rail 1 is always in contact with the chain 200 to tighten the chain 200 .

[0046] Specifically, in this embodiment, the tensioning wheel 2 can be selected from the existing automatic tensioning wheel 2, for example, see Figure 2 The tensioning wheel 2 includes a pivot 201, an eccentric wheel 203, an elastic component 202 and a movable wheel 204. The eccentric wheel 203 is rotatably sleeved on the pivot 201; the elastic component 202 includes a spring 2021, a lower bracket 2023 and an upper bracket 2022, the upper bracket 2022 is fixedly connected to the lower side of the eccentric wheel 203, the lower bracket 2023 is sleeved on the bottom of the pivot 201 and is clamped and limited with the engine during installation, the spring 2021 is connected between the lower bracket 2023 and the upper bracket 2022, and its upper end is limited by the upper bracket 2022, and its lower end is limited by the lower bracket 2023; the movable wheel 204 is rotatably sleeved on the eccentric wheel 203 through a bearing 205. When the tensioning wheel 2 is installed on the engine, the spring 2021 is in a contracted state, and when the tensioning wheel 2 is working, the spring 2021 is always in a tensioned state. In this way, the spring 2021 can provide a rotational pre-tightening force for the eccentric wheel 203 , so that the tensioning wheel 2 can always press against the tensioning rail 1 , and then the tensioning rail 1 can always press against the chain 200 , thereby ensuring the tensioning of the chain 200 .

[0047] It should be understood that the tensioning wheel 2 can also include an adjusting member 206 for adjusting the deflection center of the tensioning wheel 2, a supporting member for providing a limit for the spring 2021, etc. Since the tensioning wheel 2 is a prior art and is not the focus of the present utility model, it will not be described in detail in this embodiment.

[0048] For details, see Figure 1In this embodiment, the movable wheel 204 is slidably connected to the side of the first arc plate 1021 away from the chain guide 101. In this way, the tensioning wheel 2 is integrated with the tensioning rail 1. When the tensioning wheel 2 deflects in the direction away from the chain 200, it can drive the tensioning rail 1 to deflect in the direction away from the chain 200 to adjust the position of the tensioning wheel 2 and the chain 200; when the tensioning wheel 2 deflects in the direction close to the chain 200, it can drive the tensioning rail 1 to deflect in the direction close to the chain 200, so that the tensioning rail 1 is pressed against the chain 200 to ensure the tension of the chain 200.

[0049] For example, see Figure 1 The guide plate bracket 102 is provided with a mounting groove 3 for accommodating the tension wheel 2, the mounting groove 3 is located in the middle of the guide plate bracket 102, the tension wheel 2 is located in the mounting groove 3, and the movable wheel 204 of the tension wheel 2 is slidably connected to the side of the first arc plate 1021 away from the chain guide 101. Such a configuration facilitates the integrated arrangement of the tension wheel 2 and the tension rail 1, saving installation space.

[0050] More specifically, in this embodiment, the sliding connection between the movable wheel 204 and the first arc plate 1021 can be that the first arc plate 1021 is provided with an arc-shaped slide groove extending along its arc profile on the inner side of the mounting groove 3, and the slide groove is a "T"-shaped groove, and the outer side of the movable wheel 204 is provided with a "T"-shaped slider or a sliding member such as a ball that matches the shape of the slide groove, and the sliding member slides in the slide groove (not shown in the figure). In this way, when the tensioning wheel 2 rotates counterclockwise around the pivot 201, the tensioning wheel 2 can slide along the first arc plate 1021 and push the tensioning rail 1 to swing clockwise around the hinge point connected to the engine, so as to achieve the tensioning of the chain 200.

[0051] On the other hand, see Figure 3 The embodiment of the utility model further provides a timing chain transmission system, which includes the timing chain tensioning structure 100 of any of the above embodiments.

[0052] Optionally, the timing chain transmission system further includes a chain 200 , a camshaft sprocket 400 , a crankshaft sprocket 300 and an adjustable rail 500 .

[0053] On the other hand, an embodiment of the utility model further provides a vehicle, which includes the above-mentioned timing chain transmission system.

[0054] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A timing chain tensioning structure, characterized in that: include: A tensioning rail (1), the tensioning rail (1) comprising an arc-shaped chain guide (101), a first side of the chain guide (101) having a friction surface for cooperating with a chain (200), and a first end of the tensioning rail (1) being used for being hinged to an engine; A tensioning wheel (2), the tensioning wheel (2) comprising a pivot (201), an eccentric wheel (203) rotatably arranged on the pivot (201), an elastic component (202) providing a rotational preload force for the eccentric wheel (203), and a movable wheel (204) rotatably sleeved on the eccentric wheel (203); The movable wheel (204) is movably connected to the second side of the chain guide (101) along the contour of the second side of the chain guide (101).

2. The timing chain tensioning structure according to claim 1, characterized in that: The tensioning rail (1) further comprises a guide plate bracket (102) for providing support for the chain guide plate (101); the guide plate bracket (102) is fixedly arranged on the second side of the chain guide plate (101).

3. The timing chain tensioning structure according to claim 2, characterized in that: The guide plate bracket (102) comprises a first curved plate (1021), a second curved plate (1023), and a plurality of connecting ribs (1022) connected between the first curved plate (1021) and the second curved plate (1023); The chain guide plate (101) is arranged on a side of the first arc plate (1021) away from the second arc plate (1023), and the movable wheel (204) is slidably connected to a side of the first arc plate (1021) away from the chain guide plate (101).

4. The timing chain tensioning structure according to claim 3, characterized in that: The guide plate bracket (102) is provided with a mounting groove (3) for accommodating the tensioning wheel (2).

5. The timing chain tensioning structure according to claim 4, characterized in that: The mounting groove (3) is arranged in the middle of the guide plate bracket (102).

6. The timing chain tensioning structure according to claim 4, characterized in that: A sliding groove extending along the contour of the first arc-shaped plate (1021) is arranged on one side away from the chain guide plate (101), and a sliding member matching the sliding groove is arranged on the outer side of the movable wheel (204).

7. The timing chain tensioning structure according to claim 2, characterized in that: The first end of the guide plate bracket (102) is provided with a hinge hole (4).

8. A timing chain transmission system, characterized in that: The invention comprises the timing chain tensioning structure (100) as claimed in any one of claims 1 to 7.

9. The timing chain transmission system according to claim 8, characterized in that: It also includes a chain (200), a camshaft sprocket (400), a crankshaft sprocket (300) and an adjustable rail (500).

10. A vehicle, characterized in that: Includes the timing chain transmission system as described in claim 8 or 9.

Images