Novel elastically deformable transmission mating contact

Abstract

The utility model discloses a novel elastic deformable transmission occlusal contact head, include: elastic rubber pad, contact head, elastic gasket, semicircle ring clamping plate, internal thread cover, toothed arm, elastic rubber pad with contact head is connected, contact head is connected through semicircle ring clamping plate and internal thread cover with toothed arm, and elastic gasket is installed between contact head and toothed arm, the elastic deformable transmission occlusal contact head provided by the utility model can effectively transmit acting force and significantly reduce energy loss.

Description

Technical Field

[0001] This utility model provides a ball umbrella mechanism transmission engagement contact for a "ball umbrella arc cone automatic transmission" (patent number: 2021104647311), which is the core component of the "ball umbrella arc cone automatic transmission" and is also widely applicable to various point-contact friction transmission equipment. Background Technology

[0002] There are clear advantages to be found between the ball-and-beam cone automatic transmission and the continuously variable transmission (CVT). Their shared advantages include eliminating drive belts and complex transmission control systems, achieving continuously variable automatic transmission over a wide speed range. When meeting the same performance requirements, the ball-and-beam cone automatic transmission offers the following advantages: smaller size, contributing to improved space utilization; lower energy consumption and less energy waste; a wider speed range with smoother transitions from low to high speeds; and a relatively simpler structure, making it easier to maintain.

[0003] However, during the testing process, some problems were found in the meshing transmission of the ball-and-curve cone automatic transmission:

[0004] 1. When using gear transmission, there is disordered tooth knocking, intense vibration in the high-speed range, and tooth jamming when the transmission ratio changes, making it difficult to put into practical use.

[0005] 2. When friction transmission is used, the contacts wear out quickly and there will be significant power backflow, resulting in low transmission efficiency and making it difficult to put into practical use.

[0006] 3. When using a self-aligning meshing contact, the rotation of the contact head is restricted, and there is residual deformation during the alignment process. As time goes by, the deformation will intensify, causing a large error.

[0007] 4. When using a self-spinning contact, there are many parts to install, the processing requirements are high, the assembly accuracy cannot be guaranteed, and it is difficult to put it into practical use.

[0008] To solve the above problems, a "flexible deformable transmission engagement contact" was invented:

[0009] 1. By increasing the spin freedom of the contact head, adjusting the shape of the contact surface, and modifying the elastic rubber connecting the contact head, the contact characteristics between the ball, umbrella, and arc cone can be comprehensively improved, the ineffective transmission area (or length) can be reduced, the transmission efficiency can be increased, the power backflow phenomenon can be reduced, and an elastic margin can be provided to ensure the stability and high efficiency of the transmission process.

[0010] 2. By designing the contact head to connect with elastic rubber, it can be ensured that the contact head and the arc-cone assembly are in surface contact during the transmission process, which reduces friction loss and improves transmission efficiency.

[0011] 3. Reduce the number of parts to ensure assembly accuracy.

[0012] The invention of the elastic deformable transmission engagement contact solved the core problem of the ball-and-umbrella cone automatic transmission, making the practical application of the ball-and-umbrella cone automatic transmission a reality. Utility Model Content

[0013] The purpose of this invention is to provide a novel elastic deformable transmission engagement contact to solve the problem of excessive energy loss and inability to obtain better transmission performance in ball-and-umbrella cone automatic transmissions.

[0014] The objective of this utility model is achieved through the following technical solution:

[0015] A novel elastic deformable transmission engagement contact includes: an elastic rubber pad, a contact head, an elastic liner, a semi-circular ring retaining plate, an internally threaded cover, and a gear arm structure belonging to a ball-and-umbrella arc-cone automatic transmission. The novel elastic deformable transmission engagement contact can achieve a certain degree of deformation and can rotate freely without restriction. After rotating to a certain angle without transmitting force, the contact head does not need to return to its original position when no force is applied.

[0016] The top of the contact head contacts the cone assembly of the spherical-cone automatic transmission. The contact portion is a sphere with a spherical end face, and the center of the sphere is located on the axis of rotation of the contact head relative to the mounting base. It should be emphasized that the radius of the sphere is slightly larger than the generatrix radius of the cone, while simultaneously ensuring that the spherical surface of the contact head is tangent to the outer circumference of the cone assembly. An elastic rubber pad is attached to the contact head through a processing technique, generating a preload before transmission begins and buffering the forces acting on the contact head during transmission. During transmission, because the elastic rubber pad is fixed to the contact head, it deforms to a certain extent when the contact head contacts the cone assembly, changing the contact from point-line contact to surface contact, effectively increasing the transmitted torque.

[0017] The elastic pad is cylindrical and installed between the contact head and the engagement arm. By designing the deformation and stiffness of the rubber pad, the impact of the contact head on the engagement arm can be mitigated to a certain extent, thereby improving the service life of the contact head and the engagement arm.

[0018] The inner ring of the semi-circular ring plate is embedded in the toothed arm, and its upper surface contacts the contact head, preventing the contact head from sliding downwards along the longitudinal direction.

[0019] The internal threaded cap is connected to the contact head via threads, preventing the contact head from coming out longitudinally.

[0020] The semi-circular ring plate and the internal threaded cover work together to restrict the longitudinal degree of freedom of the contact head, preventing the contact head from moving longitudinally.

[0021] The end of the engagement arm and the inner hole of the contact head are in clearance fit, allowing the contact head to rotate freely around the central axis of the engagement arm. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0023] Figure 1 is a schematic diagram of the structure of the elastic deformable transmission engagement contact provided by this utility model;

[0024] Figure 2 is a front view of the elastic deformable transmission engagement contact provided by this utility model;

[0025] Figure 3 is a cross-sectional view of the elastic deformable transmission engagement contact provided by this utility model;

[0026] Figure 4 is a bottom view of the elastic deformable transmission engagement contact provided by this utility model;

[0027] Figure 5 is a schematic diagram of the contact head provided by this utility model;

[0028] Figure 6 is a front view of the contact head provided by this utility model;

[0029] Figure 7 is a cross-sectional view of the contact head provided by this utility model;

[0030] Figure 8 is a cross-sectional view of the contact head and the elastic rubber pad provided by this utility model;

[0031] Figure 9 is a schematic diagram of the structure of the engagement arm end provided by this utility model;

[0032] Figure 10 is a structural schematic diagram of the internal threaded cap provided by this utility model;

[0033] Figure 11 is a schematic diagram of the structure of the elastic deformable transmission engagement contact used in a ball-and-umbrella arc-cone three-dimensional gearbox;

[0034] Figure 12 is a schematic diagram showing the tangency between the contact surface of the contact head and the arc-cone assembly provided by this utility model;

[0035] Figure 13 is a simplified diagram demonstrating the elastic self-aligning meshing contact transmission provided by this utility model.

[0036] Figure 14 is a schematic diagram of the speed division of the contact head provided by this utility model during the transmission process;

[0037] Figure 15 is a schematic diagram of the contact head provided by this utility model during the transmission process.

[0038] Symbol explanation: Elastic rubber pad 01, contact head 02, elastic liner 03, semi-circular ring retainer 04, internal thread cover 05, engagement arm 06, elastic rubber pad contact surface 011, contact head contact surface 021, elastic liner mounting surface 022, engagement arm end mounting surface 023, contact head bottom limiting surface 024, contact head thread 025, new type of elastic deformable transmission engagement contact 10, ball umbrella assembly 11, arc cone assembly 12, simplified disk of drive shaft 13. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] The purpose of this invention is to provide a novel elastic deformable transmission engagement contact structure for the ball umbrella mechanism in a ball umbrella arc cone automatic transmission, in order to solve the problems of disordered tooth knocking and jamming during gear engagement, large wear during friction transmission, residual deformation during the return process, and low efficiency caused by energy backflow in the prior art.

[0041] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] As shown in Figures 1-4, this utility model includes: an elastic rubber pad 01, a contact head 02, an elastic liner 03, a semi-circular ring retaining plate 04, an internal threaded cover 05, and a toothed arm 06.

[0043] The top of the elastic rubber pad 01 contacts the cone assembly 12 to which the ball-and-umbrella cone automatic transmission belongs, and the bottom is in close contact with the upper surface 021 of the contact head 02. The main body of the contact head 02 is a cylinder, and the top engagement contact surface 021 is a spherical surface, with the center of the sphere located on the axis of the engagement arm 06. It should be emphasized that the radius of the spherical surface 021 on the upper surface of the contact head is greater than the generatrix radius of the frustum of the arc-cone assembly 12, while also satisfying the requirement that the engagement contact surface 021 is tangent to the outer circumferential surface of the arc-cone assembly. During transmission, the elastic rubber pad 01 is deformed by the compression of the contact head 02 and the arc-cone assembly 12, resulting in a surface contact. The bottom of the contact head consists of the elastic pad mounting surface 022 and the engagement arm end mounting surface 023. The contact head and the engagement arm end are mechanically connected to prevent the contact head from falling off the engagement arm end. Specifically, the connection is achieved by a semi-circular ring clamp 04 that is inserted into the groove 061 of the engagement arm, with its upper surface contacting the bottom limiting surface 024 of the contact head, ensuring that the contact head does not slide downwards along the engagement arm. The internal threaded cover 05 is connected to the threaded portion 025 of the contact head via a thread. The contact head is positioned to prevent it from detaching upwards along the engagement arm. The overall structural deformability is controlled by varying the rubber thickness, and this, combined with the selected rubber stiffness, controls the pressure of the contact head 10 on the arc-cone assembly 12, thus improving transmission conditions. The contact head 02 is connected to the engagement arm 06 via a semi-circular ring retainer 04 and an internal threaded cap 05, restricting the axial movement of the contact head, but allowing it to still rotate freely around the engagement arm axis.

[0044] The fundamental reason for the significant power loss in the AB curve is the angular velocity of revolution around the driving axis. Under the influence of the curve, the linear velocities along the entire AB curve are inconsistent, and the linear velocity at point A is... Small, linear velocity at point B Larger. The cross-section of the meshing head is changed from a trapezoid to a circle with radius r. The transmission radius from the center of the circle to the rotation center of the drive shaft is R. Simultaneously, an additional degree of freedom is added to the contact head, allowing it to rotate freely around the length of the arc-shaped meshing arm, with the center of rotation coinciding with the center of the contact head's cross-section. At point A, the orbital linear velocity is small, causing it to be driven forward by the cone; at point B, the orbital linear velocity is large, causing it to be resisted by the cone and causing it to move backward. Therefore, the meshing head can generate its own rotation. .

[0045] The formula for calculating the linear velocity of point A is: (1)

[0046] The formula for calculating the linear velocity of point B is: (2)

[0047] Eventually, when the contact head's rotational speed reaches a certain value, the velocities at points A and B will both be equal to the linear velocity along the contact head's axis. (3)

[0048] Under the action of the contact head's rotation, the actual speed of point A is the sum of the orbital linear velocity of the drive shaft and the rotational linear velocity of the meshing head, and the actual speed of point B is the sum of the orbital linear velocity of the drive shaft and the rotational linear velocity of the meshing head. Similarly, under ideal conditions, the linear velocities of all points on arc AB are always equal. As a result, there is no frictional power loss or negative drive, and the efficiency of the friction transmission of the meshing head is greatly improved.

[0049] Furthermore, the radius of the spherical contact surface is smaller than the radius of the arc cone generatrix, while the spherical contact head is tangent to the outer circumferential surface of the arc cone assembly. During transmission, the contact head and the arc cone assembly are in point contact. This structure transforms the line contact transmission of the currently proposed elastic transmission meshing contact head into point contact, greatly reducing friction loss and improving transmission efficiency.

[0050] Compared with the elastic spin and self-aligning transmission engagement contacts already proposed, the advantages of the novel elastic deformable transmission engagement contact provided by this utility model are as follows:

[0051] 1. It retains the advantages of elastic spin and self-aligning drive engagement contacts.

[0052] 2. Significantly reduced the number of parts, increasing assembly accuracy and assembly feasibility.

[0053] 3. Increased preload during transmission makes the contact surface of the contact head less prone to wear.

[0054] This article uses specific examples to illustrate the principles and implementation methods of this utility model.

[0055] The description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model; at the same time, those skilled in the art will find that, based on the idea of ​​this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A novel elastically deformable transmission engagement contact, characterized in that: include: Elastic rubber pad (01), contact head (02), elastic gasket (03), semi-circular ring retainer (04), internal thread cap (05), engagement arm (06); the elastic rubber pad (01) is connected to the contact head (02); the contact head (02) is connected to the engagement arm (06) through the semi-circular ring retainer (04) and the internal thread cap (05); the elastic gasket (03) is installed between the contact head (02) and the engagement arm (06).

2. The novel elastically deformable transmission engagement contact according to claim 1, characterized in that: The contact head (02) and the meshing arm (06) can rotate freely relative to each other. The contact head (02) does not need to be centered when it is not under force. During the rotation, the linear velocity of each point on the contact arc of the contact head (02) is basically the same, which avoids the power backflow of the transmitted torque.

3. The novel elastically deformable transmission engagement contact according to claim 1, characterized in that, The elastic rubber pad (01) is connected to the contact head through a process, so that the contact head (02) generates a preload before the transmission starts and buffers the force on the contact head (02) during the transmission process.

4. The novel elastically deformable transmission engagement contact according to claim 1, characterized in that, The inner ring of the semi-circular plate (04) is embedded in the toothed arm (06), and its upper surface contacts the contact head, so that the contact head will not slide downward along the longitudinal direction.

5. The novel elastically deformable transmission engagement contact according to claim 1, characterized in that, The internal threaded cap (05) is connected to the contact head (02) by threads, so that the contact head will not come out longitudinally.

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