A continuously variable transmission with improved wear resistance

Abstract

The utility model discloses a kind of improve the wear resistance of pli beads and continuously variable transmission, including body, wear-resistant contact part is provided on the body, and the wear surface structure of wear-resistant contact part is plane form.The utility model has the beneficial effects of slowing down the wear rate of wear-resistant contact part, reducing the maintenance cycle and cost of transmission, improving wear resistance and transmission reliability, simple structure, low manufacturing cost and not easy to damage etc.

Description

Technical Field

[0001] This utility model relates to the field of continuously variable transmission, and more specifically, to a type of pulvinus that can effectively improve wear resistance. Background Technology

[0002] In the transmission system of a continuously variable transmission (CVT), the variator beads are a core transmission component, and their structural design directly affects the operational stability and service life of the CVT. In existing technologies, traditional variator beads generally adopt a circular structure design. When this structure works in conjunction with the CVT's cover and housing, the contact form is only line contact (see...). Figure 1 In this method, the curved surface of the circular ball bearing forms only one contact line with the inner wall of the cover and shell. This line contact method in the prior art results in two problems: firstly, the extremely small contact area leads to excessively high friction and pressure per unit area, causing rapid wear on the ball bearing surface, especially under conditions of high-speed transmission operation and frequent changes in centrifugal force, further accelerating the wear rate; secondly, long-term line contact wear leads to a decrease in the dimensional accuracy of the ball bearing, not only shortening its service life but also increasing transmission clearance, reducing power transmission efficiency, and even causing transmission noise, vibration, and other malfunctions, increasing equipment maintenance frequency and costs. Furthermore, traditional round ball bearings lack dedicated positioning or error-proofing structures, making them prone to misalignment during installation, which can lead to contact position displacement and further exacerbate localized wear. Additionally, during long-term high-speed operation, the ball bearings are susceptible to radial or circumferential positional changes, disrupting the original transmission fit and further shortening their service life and the overall reliability of the transmission.

[0003] Therefore, those skilled in the art are dedicated to providing a solution that can effectively address the aforementioned technical problems. Utility Model Content

[0004] To achieve the above objectives, this utility model provides a wear-resistant bead, including a body, on which a wear-resistant contact portion is provided, and the wear-resistant surface of the wear-resistant contact portion is planar.

[0005] Furthermore, the planar shape includes a first contact surface and a second contact surface arranged symmetrically to each other, with the angle between the first contact surface and the second contact surface being 67°.

[0006] Furthermore, the diameter of the body is 30mm.

[0007] Furthermore, both sides of the main body are provided with lugs located between the first contact surface and the second contact surface.

[0008] Furthermore, the support ear includes a positioning part and a protrusion, the wear-resistant contact part has a positioning cavity, the positioning part is disposed in the positioning cavity, and the protrusion is connected to the positioning part and extends out of the positioning cavity.

[0009] Furthermore, the support lug has a hollow structure, and the body and the wear-resistant contact part are integrally formed.

[0010] Furthermore, two grooves are provided on both sides of the wear-resistant contact portion, and each groove is located on both sides of the support lug.

[0011] Furthermore, the protrusion includes two symmetrically arranged inclined segments, the upper ends of each inclined segment are connected to each other, and the lower ends of each inclined segment are connected by an arc-shaped segment.

[0012] Furthermore, the distance between the outer side of each groove and the edge of the wear-resistant contact portion is 2mm; the distance between the groove and the inclined section is 1mm; and the width of the inclined section is 1mm.

[0013] A continuously variable transmission (CVT) includes a pulley, the pulley comprising a cover and a housing, wherein eight pulley beads are disposed between the cover and the housing, and a first contact surface and a second contact surface on each pulley bead respectively cooperate with the cover and the housing.

[0014] This utility model has the following beneficial effects: 1. This utility model improves the line contact of the traditional circular ball bearing to a surface contact, which significantly increases the contact area between the ball bearing and the continuously variable transmission cover and housing, thereby slowing down the wear rate of the wear-resistant contact parts; at the same time, the 30mm diameter design of the body combined with the 67° contact surface angle ensures balanced force during surface contact, avoids abnormal wear caused by local stress concentration, and greatly extends the service life of the ball bearing compared with the traditional structure, indirectly reducing the maintenance cycle and cost of the transmission; 2. By setting up a support ear, if the installation direction is incorrect, the support ear cannot match the slot, directly avoiding misalignment of the contact surface caused by misinstallation. During operation, the positioning part of the support ear fits tightly with the positioning cavity, and the protrusion forms a limit with the internal structure of the pulley, which can effectively prevent the pulley from shifting radially or circumferentially when the gearbox rotates at high speed. This ensures that the first and second contact surfaces always maintain stable contact with the cover and housing, avoiding degradation to line contact or point contact due to position changes, further improving wear resistance and transmission reliability. It also has the advantages of simple structure, low manufacturing cost, and not being easily damaged. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the existing technology structure.

[0016] Figure 2 This is a structural schematic diagram of a specific embodiment of the present invention.

[0017] Figure 3 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 4 This is a cross-sectional view of the structure of the present invention installed in a continuously variable transmission.

[0019] Figure 5 This is a schematic diagram of the structure in which the body and the cover work together.

[0020] Figure 6 This is a schematic diagram of the structure in which the main body and the shell work together.

[0021] Figure 7 This is a schematic diagram of the structure in which the main body and the shell are connected.

[0022] The attached diagram lists the components represented by each number as follows: 1. Body; 2. Wear-resistant contact part; 3. First contact surface; 5. Second contact surface; 6. Support ear; 6a. Positioning part; 6b. Protrusion; 6b1. Inclined section; 6b2. Arc-shaped section; 7. Groove; 8. Plug; 9. Cover; 10. Shell; 100. Plug in the prior art. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments: In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not 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, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] like Figures 1 to 7As shown, a wear-resistant bead includes a body 1, on which a wear-resistant contact portion 2 is provided, and the wear-resistant surface of the wear-resistant contact portion 2 is planar.

[0026] The planar shape includes a first contact surface 3 and a second contact surface 5 arranged symmetrically to each other, and the angle θ1 between the first contact surface 3 and the second contact surface 5 is 67°.

[0027] The diameter D1 of the body 1 is 30mm.

[0028] Both sides of the main body 1 are provided with lugs 6 located between the first contact surface 3 and the second contact surface 5.

[0029] The lug 6 includes a positioning part 6a and a protrusion 6b. The wear-resistant contact part 2 has a positioning cavity. The positioning part 6a is disposed in the positioning cavity. The protrusion 6b is connected to the positioning part 6a and extends out of the positioning cavity.

[0030] The lug 6 is a hollow structure, and the body 1 and the wear-resistant contact part 2 are integrally formed.

[0031] Two grooves 7 are provided on both sides of the wear-resistant contact part 2, and each groove 7 is located on both sides of the support lug 6.

[0032] The protrusion 6b includes two symmetrically arranged inclined segments 6b1, the upper ends of each inclined segment 6b1 are connected to each other, and the lower ends of each inclined segment 6b1 are connected by an arc-shaped segment 6b2.

[0033] The distance d1 between the outer side of each groove 7 and the edge of the wear-resistant contact portion 2 is 2mm; the distance d2 between the groove 7 and the inclined section 6b1 is 1mm; and the width b1 of the inclined section 6b1 is 1mm.

[0034] A continuously variable transmission (CVT) includes a pulley 8, which includes a cover 9 and a housing 10. Eight pulley beads are disposed between the cover 9 and the housing 10. A first contact surface 3 and a second contact surface 5 on each pulley bead are respectively used in conjunction with the cover 9 and the housing 10.

[0035] This invention improves the line contact between the traditional circular pulley ball and the continuously variable transmission pulley disc to a surface contact, and adds support ears 6 to prevent misinstallation and displacement, thereby improving wear resistance and service life from both the contact form and structural stability aspects.

[0036] The optimal working principle of this utility model is as follows: Working principle of prilizumab monomer The wear-resistant contact portion 2 on the main body 1 is the core part of this utility model. The wear-resistant surface is composed of a symmetrical first contact surface 3 and a second contact surface 5 with an included angle θ1=67°. This planar shape replaces the arc-shaped surface of the traditional circular ball bearing. When the ball bearing is subjected to force and moves, the first contact surface 3 and the second contact surface 5 form surface contact with the cover 9 and the housing 10 of the continuously variable transmission, respectively, instead of the traditional line contact. The contact area is greatly increased, and the friction and pressure per unit area are significantly reduced, which directly reduces the wear rate of the wear-resistant contact portion 2 and the overall service life of the ball bearing. The diameter D1 of the main body 1 is designed to be 30mm, which, together with the 67° contact surface angle, ensures the balance of force during surface contact and avoids abnormal wear caused by local stress concentration. As a further preferred embodiment, this utility model also includes lugs 6. The lugs 6 on both sides of the main body 1 are located between the first contact surface 3 and the second contact surface 5, and are divided into a positioning part 6a and a protruding part 6b. The positioning part 6a is embedded in the positioning cavity of the wear-resistant contact part 2 to achieve precise fixation between the lugs 6 and the main body 1. The protruding part 6b extends out of the positioning cavity, and its structure is composed of two symmetrical inclined sections 6b1 and an arc-shaped section 6b2 connected together. By setting the lugs 6, if the orientation is incorrect during installation, the lugs 6 cannot match the corresponding slots of the jacking disc 8, avoiding misalignment of the contact surfaces and increased wear due to reverse installation. During operation, the jacking ball rotates at high speed with the jacking disc 8. The tight fit between the positioning part 6a of the lugs 6 and the positioning cavity, as well as the fit between the protruding part 6b and the internal structure of the jacking disc 8, ensure that the lugs 6 are properly positioned. The limiting function of the body 1 prevents the body 1 from shifting radially or circumferentially, ensuring that the first contact surface 3 and the second contact surface 5 always maintain stable surface contact with the cover 9 and the shell 10, avoiding the risk of wear due to line contact or point contact caused by position changes; two grooves 7 are provided on each side of the wear-resistant contact part 2, located on both sides of the support ear 6, and the distance d1 between the outer side of the groove 7 and the edge of the wear-resistant contact part 2 is 2mm, and the distance d2 between the groove 7 and the inclined section 6b1 is 1mm. The groove 7 can reduce the redundant material of the wear-resistant contact part 2, reduce the overall weight of the body 1, and at the same time provide clearance space for the support ear 6, avoiding interference between the support ear 6 and the external structure, and indirectly ensuring the anti-displacement effect of the support ear 6; in addition, the groove 7 can also guide the lubricating oil to flow near the contact surface, helping to reduce friction loss; Working principle of continuously variable transmission The continuously variable transmission (CVT) pulley 8 consists of a cover 9 and a housing 10, with eight pulleys of this invention disposed between them. The first contact surface 3 of each pulley corresponds to the inner wall of the cover 9, and the second contact surface 5 corresponds to the inner wall of the housing 10. When the transmission is working, the cover 9 and the housing 10 rotate relative to each other, and the pulleys are moved by centrifugal force. At this time, the surface contact between the first contact surface 3 of the pulley and the cover 9, and the second contact surface 5 and the housing 10, can stably transmit power. At the same time, due to the low wear characteristics of surface contact, the rapid wear of pulleys caused by traditional line contact is avoided, thus extending the overall maintenance cycle of the transmission. In addition, by setting eight pulleys evenly distributed, the force on the cover 9 and the housing 10 is more balanced, and each pulley bears the same load, avoiding wear of individual pulleys due to overload. At the same time, the support lugs 6 and grooves 7 of all pulleys have the same structure, ensuring the synchronization of the overall transmission.

[0037] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A type of wear-resistant bead, characterized in that: The device includes a body (1), on which a wear-resistant contact part (2) is provided. The wear-resistant surface of the wear-resistant contact part (2) is planar. The planar shape includes a first contact surface (3) and a second contact surface (5) arranged symmetrically to each other. The angle (θ1) between the first contact surface (3) and the second contact surface (5) is 67°. The diameter (D1) of the body (1) is 30mm.

2. The wear-resistant bead as described in claim 1, characterized in that: Both sides of the main body (1) are provided with lugs (6) located between the first contact surface (3) and the second contact surface (5).

3. The wear-resistant bead as described in claim 2, characterized in that: The lug (6) includes a positioning part (6a) and a protrusion (6b). The wear-resistant contact part (2) has a positioning cavity. The positioning part (6a) is disposed in the positioning cavity. The protrusion (6b) is connected to the positioning part (6a) and extends out of the positioning cavity.

4. The wear-resistant bead as described in claim 3, characterized in that: The support lug (6) is a hollow structure, and the body (1) and the wear-resistant contact part (2) are integrally formed.

5. The wear-resistant bead as described in claim 4, characterized in that: Two grooves (7) are provided on both sides of the wear-resistant contact part (2), and each groove (7) is located on both sides of the support lug (6).

6. The wear-resistant bead as described in claim 5, characterized in that: The protrusion (6b) includes two symmetrically arranged inclined segments (6b1), the upper ends of each inclined segment (6b1) are connected to each other, and the lower ends of each inclined segment (6b1) are connected by an arc segment (6b2).

7. The wear-resistant bead as described in claim 6, characterized in that: The distance (d1) between the outer side of each groove (7) and the edge of the wear-resistant contact part (2) is 2 mm; the distance (d2) between the groove (7) and the inclined section (6b1) is 1 mm; the width (b1) of the inclined section (6b1) is 1 mm.

8. A continuously variable transmission comprising the plenum beads of claim 7, characterized in that: Includes a pulley disc (8), which includes a cover (9) and a housing (10). Eight pulley beads are disposed between the cover (9) and the housing (10). The first contact surface (3) and the second contact surface (5) on each pulley bead are used in conjunction with the cover (9) and the housing (10), respectively.

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