Retarder axial fixing device, retarder and vehicle

Abstract

This invention discloses an axial fixing device for a gear ring in a reducer, comprising: a housing having an inner cavity with a limiting portion for restricting the movement of the gear ring along a first axial direction; an elastic preload member disposed between the housing and a first end face of the gear ring; and at least one elastic damping member disposed between a second end face of the gear ring and a pressure plate, wherein the pressure plate, by pressing the elastic damping member, axially constrains the gear ring between the limiting portion and the elastic damping member. The axial fixing device for the gear ring in this invention utilizes the characteristics of the elastic damping member to provide buffering and absorb vibration energy when the gear ring experiences a slight axial displacement tendency due to alternating loads, thermal deformation, or other factors. This structure avoids direct metal-to-metal contact and hard collision between the gear ring and the rigid pressure plate, thereby significantly reducing high-frequency vibration and harsh noise caused by axial impact at the source, effectively improving the NVH performance of the reducer and even the entire transmission system. This invention also includes a reducer and a vehicle.

Description

Technical Field

[0001] This invention belongs to the field of automotive technology. Specifically, this invention relates to a reducer axial fixing device, a reducer, and a vehicle. Background Technology

[0002] With increasing demands for vehicle driving comfort, controlling NVH (Noise, Vibration, and Harshness) has become increasingly important. For gear transmission systems in reducers, current gear NVH control primarily focuses on the gear meshing process, improving it through profile modification or process optimization. However, axial movement of gears under alternating loads, thermal expansion and contraction, and assembly tolerances is also a key source of NVH.

[0003] In traditional structures, the end face of the gear ring is in rigid contact with the metal pressure plate. When it moves, it will cause direct collision, producing harsh noise and vibration, which seriously affects comfort and the life of the parts.

[0004] Although the gap between the gear ring and the pressure plate can be reduced by tolerance control, the high-frequency impact and NVH problems caused by the gear being subjected to thousands of Newtons of axial load during transmission cannot be completely eliminated. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides an axial fixing device for a speed reducer, the purpose of which is to reduce speed reducer noise.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an axial fixing device for a reducer gear ring, comprising: The housing has an inner cavity having a limiting portion for restricting the movement of the gear ring along a first axial direction, the limiting portion being used to abut against the first end face of the gear ring; A gear ring has teeth on its outer circumference. The gear ring is accommodated in the inner cavity of the housing, and the first end face of the gear ring abuts against the limiting part of the housing. A pressure plate, which is fixed to the housing by fasteners; An elastic preload element is disposed between the housing and the first end face of the gear ring; and At least one elastic damping element is disposed between the second end face of the gear ring and the pressure plate, and the pressure plate axially constrains the gear ring between the limiting portion and the elastic damping element by pressing the elastic damping element.

[0007] The elastic damping elements are multiple and are arranged at intervals along the circumference of the gear ring.

[0008] The second end face of the gear ring has grooves corresponding to the number of elastic damping elements, and one end of each elastic damping element is embedded in the groove. The one end of the elastic damping element and the groove are interference fit.

[0009] The cross-sectional shape of the groove is non-circular, and the shape of one end of the elastic damping member is adapted to the shape of the groove to prevent the elastic damping member from rotating relative to the gear ring.

[0010] The elastic damping element is an annular damping pad, one side of which is connected to the second end face of the gear ring, and the other side is in contact with the pressure plate.

[0011] The annular damping pad has a positioning protrusion on the side facing the gear ring, and the second end face of the gear ring has a positioning unit that mates with the positioning protrusion.

[0012] The material of the elastic damping element is rubber.

[0013] The elastic preload element is a wave spring.

[0014] The limiting part of the housing is an annular boss formed on its inner cavity wall, and the first end face of the gear ring abuts against the end face of the annular boss.

[0015] The inner wall of the housing is provided with toothed grooves extending along its axial direction, and the teeth of the gear ring mesh with the toothed grooves.

[0016] The present invention also provides a speed reducer, including the aforementioned speed reducer gear ring axial fixing device.

[0017] The present invention also provides a vehicle including the aforementioned reducer.

[0018] The axial fixing device for the gear ring of the reducer of the present invention, by setting an elastic damping element between the gear ring and the pressure plate, utilizes the elastic and damping characteristics of the elastic damping element to provide buffering and absorb vibration energy when the gear ring has a slight tendency to axial displacement due to alternating loads, thermal deformation, etc. This structure avoids direct metal contact and hard collision between the gear ring and the rigid pressure plate, thereby significantly reducing the high-frequency vibration and harsh noise caused by axial impact from the root, and effectively improving the NVH performance of the reducer and even the entire transmission system. Attached Figure Description

[0019] Figure 1 This is an exploded view of the axial fixing device for the gear ring of the reducer of the present invention; Figure 2 This is an assembly cross-sectional view of the axial fixing device for the gear ring of the reducer of the present invention; The markings in the above figures are as follows: 1-shell; 11-tooth groove; 12-cavity bottom wall; 13-limiting part; 14-internal threaded hole; 2-elastic preload; 3-tooth ring; 31-outer gear tooth; 32-groove; 33-second end face; 34-first end face; 4-elastic damping element; 41-tooth ring side; 42-pressure plate side; 5-pressure plate; 6-fastener. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," and similar expressions used in this document are for illustrative purposes only.

[0022] It should be noted that in the following embodiments, the terms "first" and "second" do not represent an absolute distinction in structure and / or function, nor do they represent the order of execution, but are merely for the convenience of description.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example 1

[0024] The technical concept of this invention includes: In the field of vehicle engineering, driving comfort is receiving increasing attention, and the requirements for controlling NVH (noise, vibration, and harshness) issues are constantly increasing. For gear transmission systems in reducers, existing technologies mainly focus on NVH problems generated by gear meshing, typically improved through gear modification, optimized machining processes, or avoiding tooth surface impacts. However, another key source of gear NVH problems is axial movement of the gear ring, i.e., the gear ring undergoes slight axial displacement under alternating loads, system thermal expansion and contraction, and machining and assembly tolerances, resulting in rigid collisions with the pressure plate. In traditional designs, the end face of the gear ring is directly and rigidly connected to the metal pressure plate. When axial movement occurs, the gear ring will experience frequent, rigid metal-to-metal collisions with the pressure plate, generating harsh noise and strong vibrations—the NVH problem. This serious NVH problem not only reduces driving comfort, but long-term impacts also accelerate the wear of the gear ring end face and the pressure plate, affecting the service life of components and the reliability of the transmission system. Reducing the gap between the gear and the pressure plate by controlling the gear tolerance is one method, but the axial force on the gear during transmission reaches several thousand Newtons. This method cannot completely eliminate NVH problems caused by high-frequency vibration and collision. The technical solution of the present invention is as follows: In a first aspect, embodiments of the present invention provide an axial fixing device for a reducer gear ring, comprising: The housing 1 has an inner cavity with a limiting part 13 for restricting the movement of the gear ring 3 along the first axial direction. The limiting part 13 is used to abut against the first end face 34 of the gear ring 3. The gear ring 3 has teeth on its outer periphery. The gear ring 3 is accommodated in the inner cavity of the housing 1, and the first end face 34 of the gear ring 3 abuts against the limiting part 13 of the housing 1. Pressure plate 5, which is fixed to housing 1 by fastener 6; The elastic preload 2 is disposed between the housing 1 and the first end face 34 of the gear ring 3; and At least one elastic damping element 4 is disposed between the second end face 33 of the gear ring 3 and the pressure plate 5. The pressure plate 5 axially constrains the gear ring 3 between the limiting part 13 and the elastic damping element 4 by pressing the elastic damping element 4.

[0025] Specifically, in this embodiment of the invention, an elastic damping element 4 is provided between the second end face 33 of the gear ring 3 and the pressure plate 5. Utilizing the elastic and damping characteristics of this element 4, it can provide buffering and absorb vibration energy when the gear ring 3 experiences a slight axial displacement due to alternating loads, thermal deformation, or other factors. This structure avoids direct metal-to-metal contact and hard collisions between the gear ring 3 and the rigid pressure plate 5, thereby significantly reducing high-frequency vibrations and harsh noises caused by axial impacts at the source, effectively improving the NVH performance of the reducer and even the entire transmission system.

[0026] like Figure 1 and Figure 2As shown, the gear ring 3 is axially constrained between the limiting part 13 of the reducer housing 1 and the pressurized elastic damping member 4. The pressure applied by the pressure plate 5 through the fastener 6 is uniformly and flexibly transmitted to the gear ring 3 via the elastic damping member 4. Combined with the initial preload provided by the elastic preload member 2, this forms a stable and flexible axial constraint system. This system can effectively suppress the axial movement of the gear ring 3 during operation while bearing the working load, ensuring the axial positioning accuracy and working stability of the transmission chain. At the same time, the intervention of the elastic damping member 4 isolates the rigid friction and impact between the end face of the gear ring 3 and the metal pressure plate 5. The elastic preload member 2 eliminates the initial assembly gap and reduces the micro-amplitude reciprocating motion (micro-motion) of the gear ring 3 under working conditions. These two aspects work together to significantly reduce the wear rate of the end face of the gear ring 3 and the contact area of ​​the pressure plate 5, thereby extending the service life of related components and improving the reliability of the entire device.

[0027] like Figure 1 and Figure 2 As shown, the function of the gear ring 3 is to form a gear pair, realizing the transmission of power and motion, and is a key component for power transmission. The gear ring 3 is a ring-shaped gear component, and multiple external gear teeth 31 are machined on the outer circumferential surface of the gear ring 3. The gear ring 3 achieves circumferential positioning by meshing the external gear teeth 31 on its outer ring with the tooth grooves 11 on the inner cavity wall of the housing 1. The number and module of the external gear teeth 31 and the tooth grooves are matched. The gear teeth and tooth grooves 11 cooperate to form an anti-rotation structure, and the gear teeth are embedded in the tooth grooves 11. The meshing of the external gear teeth 31 and tooth grooves 11 forms the radial and circumferential positioning of the gear ring 3 within the housing 1, which is used to withstand the working torque. Internal gear teeth are machined on the inner circumferential surface of the gear ring 3 for meshing with gears.

[0028] like Figure 1 and Figure 2 As shown, the gear ring 3 has two main axial end faces, namely the first end face 34 and the second end face 33, which are opposite end faces in the axial direction of the gear ring 3. The first end face 34 is a precision-machined flat surface. In the assembled state, the first end face 34 directly contacts and fits against the end face of the limiting boss of the housing 1, thereby determining the initial axial position of the gear ring 3 within the housing 1. The second end face 33 is also a precision-machined flat surface, and on the second end face 33, six circular grooves 32 are evenly formed along the circumference. The depth of these grooves is less than the thickness of the gear ring 3, forming blind holes. These grooves 32 are not only used for weight reduction, but their core function is to serve as the mounting base for the elastic damping element 4.

[0029] like Figure 1 and Figure 2As shown, in this embodiment of the invention, the limiting part 13 of the housing 1 is an annular boss formed on its inner cavity wall, and the first end face 34 of the gear ring 3 abuts against the end face of the annular boss. The housing 1 constitutes part of the reducer housing. The housing 1 has a cylindrical inner cavity, and several axially extending toothed grooves 11 are precisely machined on its inner cavity wall. These toothed grooves 11 are evenly distributed circumferentially. At one end of the inner cavity of the housing 1 near the bottom wall 12, an annular limiting boss is integrally formed. The inner diameter of the limiting boss is designed to be smaller than the outer diameter of the gear ring 3. On the open end face of the inner cavity of the housing 1 away from the bottom wall 12, a plurality of internal threaded holes 14 are machined. These internal threaded holes 14 are evenly distributed circumferentially. The integrally formed limiting boss provides a robust and precise axial positioning reference for the first end face 34 of the gear ring 3, ensuring the accuracy of the initial axial position of the gear ring 3 and being able to withstand the main axial force from the gear ring 3.

[0030] like Figure 1 and Figure 2 As shown, in this embodiment of the invention, the pressure plate 5 is fixed to the housing 1 by fasteners 6. The pressure plate 5 has multiple through holes through which the fasteners 6 pass. The fasteners 6 are inserted into the internally threaded holes 14 on the open end face of the housing 1. The internally threaded holes 14, evenly distributed along the circumference on the open end face of the housing 1, provide a standardized interface for the installation of the pressure plate 5 via the fasteners 6. The evenly distributed multiple internally threaded holes 14 facilitate uniform force distribution on the pressure plate 5, ensuring symmetrical distribution of the preload force on the elastic damping element, thereby guaranteeing the stability and consistency of the axial constraint of the gear ring 3.

[0031] like Figure 1 As shown in this embodiment of the invention, to achieve uniform and stable elastic constraint on the gear ring 3, multiple elastic damping elements 4 are provided. All elastic damping elements 4 are arranged at intervals along the circumference of the gear ring 3 and are evenly distributed. Correspondingly, a groove 32 corresponding to the number of elastic damping elements 4 is provided on the second end face 33 of the gear ring 3. One end of each elastic damping element 4 is embedded in the corresponding groove 32, and the end of the elastic damping element 4 and the groove 32 are in an interference fit. This interference fit ensures that the elastic damping element 4 can be stably pre-positioned on the gear ring 3 during assembly and will not fall off or shift when the pressure plate 5 is subsequently installed, greatly simplifying the assembly process.

[0032] Furthermore, to prevent the elastic damping element 4 from rotating circumferentially within the groove 32 due to vibration or force during operation, thus affecting the stability of its damping effect, the cross-sectional shape of the groove 32 is designed to be non-circular (e.g., rectangular, D-shaped, or other irregular shapes). Correspondingly, the shape of one end of the elastic damping element 4 is adapted to the shape of the groove 32, forming an anti-rotation fit, which prevents the elastic damping element 4 from rotating relative to the gear ring 3. This design ensures that there is no relative circumferential movement between the elastic damping element 4 and the gear ring 3, making the transmission path of vibration energy consistent and controllable.

[0033] In this embodiment of the invention, the elastic damping element 4 is made of rubber, specifically a cylindrical rubber rod. Rubber materials, particularly synthetic rubbers such as acrylic rubber (ACM) and ethylene-acrylic rubber (AEM), possess high internal damping coefficients, excellent oil resistance, and fatigue resistance, effectively absorbing and dissipating vibration energy, and adapting to the lubricating oil environment inside the reducer and long-term alternating load conditions. The mating end of the rubber rod that contacts the gear ring 3 can be designed with rounded corners; that is, the end of the elastic damping element 4 embedded in the groove 32 is designed with rounded corners to facilitate assembly and insertion.

[0034] In this embodiment of the invention, multiple elastic damping elements 4 are uniformly arranged circumferentially along the gear ring 3, so that the preload applied by the pressure plate 5 and the axial load generated during operation can be uniformly distributed and transmitted, avoiding local stress concentration and ensuring the uniformity and overall stability of the axial constraint of the gear ring 3. Moreover, the pre-positioning of the elastic damping elements 4 on the gear ring 3 is achieved through the interference fit with the groove 32. This structure provides effective assembly assistance, allowing the subsequent covering of the pressure plate 5 and bolt tightening operations to proceed smoothly, improving assembly efficiency and consistency. At the same time, the elastic damping elements 4 are made of special rubber materials with high damping, oil resistance, and fatigue resistance, ensuring that the elastic damping elements 4 can maintain excellent vibration reduction and noise reduction performance and shape stability for a long time under harsh working conditions, thereby ensuring the service life and reliability of the entire device.

[0035] like Figure 1 and Figure 2 As shown, the elastic preload 2 is a ring-shaped wave spring washer capable of elastic deformation, commonly referred to as a wave spring. This wave spring is positioned between the cavity bottom wall 12 of the housing 1 and the first end face 34 of the toothed ring 3. During assembly, when the toothed ring 3 is inserted into the housing 1 and its first end face 34 contacts the limiting boss of the housing 1, the elastic preload 2 positioned between the cavity bottom wall 12 and the first end face 34 of the toothed ring 3 is compressed, thereby generating a continuous axial elastic force pointing towards the pressure plate 5. The ring-shaped wave spring provides a uniformly distributed circumferential elastic force to the toothed ring 3, resulting in a uniform stress distribution. The final axial constraint of the toothed ring 3 is achieved by a two-way action: on one side (the side where the first end face 34 is located), the wave spring provides an initial preload force pointing towards the pressure plate 5; on the other side (the side where the second end face 33 is located), the pressure plate 5 provides the main constraint force by pressing the elastic damping element 4 with fasteners 6. The two work together to achieve a flexible axial fixation of the toothed ring 3 without gaps and with damping characteristics.

[0036] like Figure 1 and Figure 2As shown, in this embodiment of the invention, the pressure plate 5 is an annular flat plate component made of metal sheet (e.g., steel or aluminum alloy). The annular pressure plate 5 made of metal has a simple structure and good rigidity, and can provide a flat and stable pressure surface for the elastic damping element 4, ensuring uniform transmission of preload.

[0037] The pressure plate 5 has several through holes machined on it, and the positions of these through holes correspond one-to-one with the internal threaded holes 14 provided on the end face of the housing 1. The fasteners 6 are preferably hexagon socket head cap screws. In this embodiment, there are three fasteners 6, all of which are evenly distributed along the circumference of the pressure plate 5. During assembly, each bolt passes through the corresponding through hole on the pressure plate 5 in sequence and is screwed into the internal threaded hole 14 on the end face of the housing 1. By tightening this set of bolts to the specified torque, the pressure plate 5 can be firmly and immovably fixed to the end face of the housing 1. By controlling the tightening torque of the bolts, the required axial preload can be precisely and controllably applied to the inner elastic damping element 4 and the gear ring 3, and this force is evenly distributed.

[0038] The pressure plate 5 is used as the final pressure application element, converting the bolt force of its fixing into a stable clamping force on the elastic damping element 4. This clamping force is superimposed with the initial preload provided by the wave spring, together ensuring that the gear ring 3 can maintain the stability of its axial position under any working condition, while the elastic damping element 4 eliminates impact vibration.

[0039] During assembly, firstly, the elastic preload 2 is placed inside the housing 1, resting flat against the bottom wall 12 of the cavity. Next, the gear ring 3 is inserted axially into the housing 1, aligning and engaging the outer gear teeth 31 with the inner wall grooves 11, ensuring the first end face 34 of the gear ring 3 abuts against the limiting boss of the housing 1. At this point, the elastic preload 2 is slightly compressed. Then, the mating ends of the six elastic damping elements 4 are respectively embedded into the six grooves 32 of the second end face 33 of the gear ring 3, completing the pre-positioning of the rubber rods. Subsequently, the pressure plate 5 is placed over the assembly of the gear ring 3, so that the inner ring surface or the entire end face of the pressure plate 5 covers the other ends of all the elastic damping elements 4. Finally, three fasteners 6 are sequentially passed through the through holes of the pressure plate 5 and screwed into the internal threaded holes 14 of the housing 1, and tightened evenly in two or three steps using a cross-tightening method to the rated torque value specified in the process.

[0040] When fastener 6 is tightened, pressure plate 5 displaces downward, applying an axial preload pressure to elastic damping element 4. Due to the elasticity of elastic damping element 4, this pressure is gently and evenly transmitted to the second end face 33 of gear ring 3. Under this pressure, the first end face 34 of gear ring 3 is pressed more tightly against the limiting boss inside housing 1, while the second end face 33 of gear ring 3 is pressed against pressure plate 5 through elastic preload element 2 and elastic damping element 4. Thus, gear ring 3 is axially clamped within the constraint system consisting of limiting boss (rigid constraint), elastic damping element 4 (elastic constraint), and elastic preload element 2 (elastic auxiliary), achieving reliable fixation without macroscopic movement.

[0041] The core of this invention lies in the intervention of the elastic damping element 4, which alters the original fixing method. The axial movement of the gear ring 3 is restricted by the elastic damping element 4. Even if the gear ring 3 is subjected to axial force and attempts to move, it will first be buffered and blocked by the compressed elastic damping element 4. The elastic characteristics of the elastic damping element 4 can effectively absorb vibration and impact energy, thereby avoiding direct hard contact between the gear ring 3 and the rigid pressure plate 5. Therefore, the metallic impact noise and high-frequency vibration caused by the collision between the two are fundamentally eliminated, thus significantly reducing the NVH problem of the central reducer and improving product quality and user experience.

[0042] In summary, this invention, through a clever addition structure, effectively solves the 3NVH problem of gear rings that has long troubled those skilled in the art with extremely low cost and structural modifications, and has strong practicality and promotional value.

[0043] The axial fixing device for the gear ring of the reducer provided in this embodiment of the invention has the following significant advantages compared with the prior art: 1. Superior NVH Performance: By introducing an elastic damping element 4 between the gear ring 3 and the pressure plate 5, a highly efficient vibration isolation interface is constructed. This elastic damping element 4, utilizing its excellent elasticity and high internal damping characteristics, effectively absorbs, buffers, and dissipates the impact energy generated by the axial movement of the gear ring 3, thereby isolating the gear ring 3 from direct metal-to-metal collisions with the rigid pressure plate 5. This fundamentally and effectively eliminates or significantly reduces the harsh noise and severe vibrations caused by high-frequency rigid impacts, greatly improving the smoothness of operation and ride comfort of the reducer and the entire transmission system.

[0044] 2. Reliable Axial Displacement Constraint: The preload applied by the pressure plate 5 keeps the elastic damping element 4 under compression, thus forming a continuous and flexible axial constraint on the gear ring 3. This constraint force, in conjunction with the rigid limiting of the limiting boss of the housing 1, can stably limit the axial displacement of the gear ring 3 caused by alternating loads, thermal deformation, and other factors during operation, ensuring the accuracy of the axial positioning of the transmission chain and its stability under dynamic conditions.

[0045] 3. Simple structure and easy implementation: This solution does not require complex modifications to the existing main load-bearing structures such as the shell 1 and pressure plate 5; only simple additional machining of the gear ring 3 is needed. The overall structure is compact, with few new parts, low modification costs, and a simple and convenient assembly process, making it easy to implement and promote on existing product platforms.

[0046] 4. Enhanced System Reliability and Durability: The intervention of the elastic damping component 4 avoids direct contact and rigid friction between the end face of the gear ring 3 and the metal pressure plate 5, significantly reducing wear between them. Simultaneously, the elastic preload component 2 eliminates assembly clearances, reducing fretting wear. These measures collectively extend the service life of key components such as the gear ring 3 and pressure plate 5, reduce the failure rate, and thus improve the operational reliability and long-term durability of the entire reducer system.

[0047] Secondly, embodiments of the present invention also provide a speed reducer, including the speed reducer gear ring axial fixing device with the above-described structure. This speed reducer gear ring axial fixing device can be referred to... Figure 1 and Figure 2 The details will not be elaborated further here. Since the reducer of the present invention includes the reducer gear ring axial fixing device in the above embodiments, it has all the advantages of the above-described reducer gear ring axial fixing device.

[0048] Thirdly, embodiments of the present invention provide a vehicle including a reducer with the above-described structure. Since the reducer includes the axial fixing device for the reducer gear ring as described in the above embodiments, the vehicle of the present invention also possesses all the advantages of the above-described axial fixing device for the reducer gear ring. Example 2

[0049] The main difference between this embodiment and Embodiment 1 lies in the structure and arrangement of the elastic damping element 4. In this embodiment, the elastic damping element 4 is an annular damping pad, one side of which is connected to the second end face 33 of the gear ring 3, and the other side is in contact with the pressure plate 5.

[0050] Furthermore, the annular damping pad has a positioning protrusion on the side facing the gear ring 3, and the second end face 33 of the gear ring 3 has a positioning unit that mates with the positioning protrusion, such as a positioning hole or a positioning groove.

[0051] In this embodiment, the elastic damping element 4 is an integral annular damping pad. The pad is made of elastic damping material such as rubber, and its shape matches the shape of the second end face 33 of the toothed ring 3, typically being an annular circular plate.

[0052] In this embodiment, in order to achieve stable positioning of the annular damping pad during assembly and operation, and to prevent it from radially moving or circumferentially rotating relative to the gear ring 3, a positioning structure was specially designed. The positioning structure consists of positioning protrusions and positioning holes.

[0053] One main surface of the annular damping pad (the side facing the gear ring 3) is designed with a positioning protrusion. This positioning protrusion is used to mate with the positioning holes machined on the second end face 33 of the gear ring 3, forming a positioning structure. The other main surface of the annular damping pad (the side facing the pressure plate 5) is a flat surface, used to make flat contact with the inner end face of the pressure plate 5. The positioning protrusion and the annular damping pad can be integrally formed. These positioning protrusions can be continuous or discontinuous annular ribs, or multiple cylindrical, rectangular, or irregularly shaped bosses evenly distributed along the circumference. The height of the positioning protrusion is slightly less than the depth of the corresponding positioning hole machined on the second end face 33 of the gear ring 3.

[0054] On the second end face 33 of the gear ring 3, a positioning hole is machined that matches the shape, size, and position of the aforementioned positioning protrusion. The positioning hole and the positioning protrusion form a clearance fit or a slight interference fit. A clearance fit is preferred to facilitate assembly; at the same time, the lateral clearance between the positioning hole and the positioning protrusion should be controlled to be sufficiently small to achieve effective radial and circumferential limiting.

[0055] The precise pre-positioning of the annular damping pad on the end face of the gear ring 3 is achieved through the engagement of the positioning hole and the positioning protrusion. This engagement ensures that the pad is stably placed in the designed position before the pressure plate 5 is installed, and will not shift due to gravity or slight disturbances, greatly simplifying subsequent assembly operations. In the working state, this engagement structure can effectively resist the relative slippage between the pad and the gear ring 3 that may be caused by vibration and torsional loads.

[0056] The other end face of the annular damping washer (i.e., the face facing the pressure plate 5) is a continuous and flat plane. After assembly, this plane achieves full-area flat contact with the inner end face of the pressure plate 5. The flat contact surface ensures that when the fastener 6 is tightened, the axial clamping force applied by the pressure plate 5 can be evenly and continuously transmitted to the entire annular damping washer, and then evenly applied to the end face of the gear ring 3 through the washer, avoiding stress concentration.

[0057] In this embodiment of the invention, the material of the elastic damping element 4 is a rubber material, especially synthetic rubbers such as acrylic rubber (ACM) and ethylene-acrylate rubber (AEM) that have high internal damping coefficients, excellent oil resistance and fatigue resistance, which can effectively absorb and dissipate vibration energy and adapt to the lubricating oil environment inside the reducer and long-term alternating load conditions.

[0058] During assembly, firstly, the elastic preload 2 is placed inside the housing 1, resting flat against the bottom wall 12 of the cavity. Next, the gear ring 3 is inserted axially into the housing 1, aligning the outer teeth 31 of the gear ring 3 with the inner wall grooves 11, ensuring that the first end face 34 of the gear ring 3 abuts against the limiting boss of the housing 1. At this point, the elastic preload 2 is slightly compressed. Then, the integral annular rubber damping pad is aligned with the positioning hole on the second end face 33 of the gear ring 3 through its positioning protrusion, and gently pressed into place. Subsequently, the pressure plate 5 is placed over the assembly of the gear ring 3, so that the inner ring surface or the entire end face of the pressure plate 5 covers the other end of all the elastic damping elements 4. Finally, three fasteners 6 are passed sequentially through the through holes of the pressure plate 5 and screwed into the internal threaded holes 14 of the housing 1, and tightened evenly in two or three steps using a cross-tightening method to the rated torque value specified in the process.

[0059] When fastener 6 is tightened, pressure plate 5 displaces downward, applying an axial preload pressure to elastic damping element 4. Due to the elasticity of elastic damping element 4, this pressure is gently and evenly transmitted to the second end face 33 of gear ring 3, causing elastic damping element 4 to compress and deform. Under this pressure, the first end face 34 of gear ring 3 is pressed more tightly against the limiting boss inside housing 1. Thus, gear ring 3 is axially clamped within the constraint system consisting of limiting boss (rigid constraint), elastic damping element 4 (elastic constraint), and elastic preload element 2 (elastic auxiliary), achieving reliable fixation without macroscopic movement.

[0060] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. An axial fixing device for a reducer gear ring, characterized in that, include: The housing (1) has an inner cavity with a limiting part for restricting the movement of the gear ring (3) along the first axial direction, the limiting part being used to abut against the first end face of the gear ring; Pressure plate (5), which is disposed on the housing; An elastic preload (2) is disposed between the housing (1) and the second end face (33) of the gear ring (3); as well as At least one elastic damping element (4) is disposed between the second end face (33) of the gear ring (3) and the pressure plate (5), wherein the pressure plate (5) axially constrains the gear ring (3) between the limiting portion and the elastic damping element (4) by pressing the elastic damping element (4).

2. The reducer gear ring axial fixing device according to claim 1, characterized in that, The elastic damping element (4) is multiple and is arranged at intervals along the circumference of the gear ring (3).

3. The axial fixing device for the gear ring of the reducer according to claim 2, characterized in that, The second end face (33) of the gear ring (3) is provided with grooves (32) corresponding to the number of elastic damping elements (4), and one end of the elastic damping element (4) is embedded in the groove (32).

4. The axial fixing device for the gear ring of the reducer according to claim 3, characterized in that, The cross-sectional shape of the groove (32) is non-circular, and the shape of one end of the elastic damping member (4) is adapted to the shape of the groove (32) to prevent the elastic damping member (4) from rotating relative to the toothed ring (3).

5. The axial fixing device for the gear ring of the reducer according to claim 1, characterized in that, The elastic damping element (4) is an annular damping pad, one side of which is connected to the second end face (33) of the toothed ring (3), and the other side is in contact with the pressure plate (5).

6. The axial fixing device for the gear ring of the reducer according to claim 5, characterized in that, The annular damping pad has a positioning protrusion on the side facing the toothed ring (3), and the second end face (33) of the toothed ring (3) has a positioning unit that cooperates with the positioning protrusion.

7. The axial fixing device for the gear ring of the reducer according to any one of claims 1-6, characterized in that, The elastic preload (2) is a wave spring.

8. The axial fixing device for the gear ring of the reducer according to any one of claims 1-7, characterized in that, The limiting part of the housing is an annular boss (13) formed on its inner cavity wall, and the first end face (34) of the toothed ring (3) abuts against the end face of the annular boss (13).

9. A speed reducer, characterized in that, The device includes the axial fixing device for the gear ring of the reducer as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the speed reducer as described in claim 9.

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