A pto assembly with a disturbance impact structure

Abstract

The utility model discloses a PTO assembly assembly with anti-interference degree impact structure, including PTO chamber, double row self aligning roller bearing, deep groove ball bearing, PTO gear shaft, oil seal, transmission sleeve and the structure. The PTO chamber is equipped with front and rear bearing mounting hole, and the front end sets up double row self aligning roller bearing for anti-impact load, and the rear end sets up deep groove ball bearing for radial support. PTO gear shaft penetrates two bearings, and oil seal is installed in the outermost end of PTO chamber, and the inner ring of oil seal and the outer circle surface of gear shaft are combined to form dynamic sealing structure, and the oil return groove is equipped between oil seal and bearing to guide the backflow of lubricating oil. The structure can improve the anti-impact performance, prevent lubricating oil leakage, prolong the bearing life, and be applicable to the high disturbance load application in the engine power output occasion.

Description

Technical Field

[0001] This utility model relates to the field of PTO component technology, and in particular to a PTO component assembly with an anti-impact structure. Background Technology

[0002] In modern industry, engine performance and durability are crucial to the overall operating efficiency of equipment. However, with technological advancements and the continuous expansion of application scenarios, engine operating conditions are becoming increasingly demanding, posing greater challenges to all engine components. Particularly at the engine's rear end, the PTO (Power Transfer Unit) is a key component at the engine's kinetic energy output, and its design and performance are of paramount importance.

[0003] To adapt to more demanding operating environments, the design of the PTO assembly at the rear of the engine is evolving towards improved structural reliability and sealing performance. This evolution aims to prevent bearing burn-out and oil leakage by changing the internal structure of the PTO assembly; and to stably output engine kinetic energy under high engine temperature, full load, and even under disturbed impact loads. However, this evolution also brings unprecedented challenges to the shaft components of the PTO assembly.

[0004] Traditional PTO (Power Transfer) assemblies are inadequate under high load and high disturbance conditions. As PTO assemblies are used in more and more vehicles, the requirements for their resistance to high loads and disturbances from the power output end are becoming increasingly stringent. These high load conditions and disturbances not only accelerate bearing wear but also cause oil seal deformation and loosening, thus severely affecting the reliability and sealing performance of the PTO assembly. Utility Model Content

[0005] The purpose of this invention is to solve the problems in the prior art where PTO components are used in harsh environments, which can easily cause bearing erosion, unreliable oil seals, oil leakage, and impurities entering the bearing.

[0006] This utility model is achieved using the following technical solution: a PTO assembly with an anti-disturbance impact structure, characterized in that it includes a PTO chamber with a bearing mounting hole running through it in the front-rear direction; a first bearing located at the front end of the bearing mounting hole, which is a double-row self-aligning roller bearing, used to enhance the axial impact load bearing capacity; a second bearing located at the rear end of the bearing mounting hole, which is a deep groove ball bearing, used to provide radial support and operational flexibility; a PTO gear shaft passing through and supported on the first and second bearings; an oil seal installed at the rear end of the PTO chamber, the inner ring of the oil seal making sealing contact with the outer circular surface of the PTO gear shaft to form a dynamic sealing structure; an oil return groove is provided between the second bearing and the oil seal in the PTO chamber to guide the lubricating oil backflow and prevent pressure accumulation in the sealing area; wherein, the oil seal is located on the outer side of the rear end of the PTO chamber to prevent external dust and impurities from entering the interior of the PTO chamber. Through the above structural combination, not only is the load-bearing performance of the assembly improved under high-disturbance impact conditions, but the circulation efficiency and sealing reliability of the lubrication system are also enhanced, making it suitable for stable power output under complex working conditions.

[0007] Furthermore, a gap is provided between the outer ring of the first bearing and the end face of the mounting hole of the PTO chamber bearing to allow for fine adjustment of the bearing to absorb dynamic load offset. This structure provides the roller bearing with adequate buffer space when subjected to external impact, reducing stress concentration within the bearing caused by rigid fit, thereby extending bearing life and improving structural stability.

[0008] Furthermore, the outer rings of the first and second bearings are interference-fitted with the PTO inner bore, and the inner rings are interference-fitted with the PTO gear shaft. A spacer is provided between the two bearings, and the spacer fits the bearing with a clearance fit. This combination of fits ensures overall assembly rigidity and transmission accuracy, and by setting the spacer clearance, it alleviates the axial stress transmission between the two bearings, which helps maintain the balance of the overall structure during long-term operation.

[0009] Furthermore, the PTO gear shaft is precision machined, with an outer cylindrical surface roughness of no more than Ra0.4, to improve the sealing performance with the oil seal. Controlling the surface finish within Ra0.4 not only enhances the tight fit between the oil seal lip and the shaft but also effectively reduces friction and wear, improving seal durability and the reliability of the PTO assembly operation.

[0010] Furthermore, the oil return groove is an obliquely arranged through channel extending from the second bearing mounting area to the oil seal mounting area. Due to the oblique layout of the oil return groove, the lubricating oil can smoothly flow back along the direction of gravity or centrifugal force, avoiding seal failure caused by oil accumulation. This is particularly suitable for bearing cavity structures operating at high speeds.

[0011] Furthermore, it also includes a transmission sleeve fixedly connected to the tail of the PTO gear shaft. The transmission sleeve is connected to the PTO gear shaft via an internal spline and locked by bolts. The locking process is achieved by the combined action of the washer and the bolt. This connection structure ensures that torque is stably transmitted from the PTO gear shaft to the transmission sleeve, the spline positioning ensures the fit accuracy, and the combination of bolts and washer provides axial preload, effectively preventing loosening of the connection and improving the overall transmission reliability.

[0012] Furthermore, the oil seal is made of an elastic material, possessing high temperature and high pressure resistance. An axial dynamic seal is formed between the oil seal and the PTO gear shaft, and the oil seal is located at the outdoor end of the PTO assembly to isolate it from dust and sediment in the external environment. This arrangement makes the oil seal the first line of defense between the assembly and the external environment, effectively delaying the erosion of the bearing system by environmental factors while ensuring internal sealing, thereby significantly improving the service life and maintenance cycle of the PTO assembly.

[0013] The beneficial effects of the PTO component assembly with shock-resistant structure described in this utility model include:

[0014] The front end uses double-row self-aligning roller bearings to effectively withstand axial impact loads, and combined with the flexible support of deep groove ball bearings at the rear end, it improves the overall stability of the machine under high-turbulence conditions.

[0015] The oil seal is located on the outermost side, forming the first environmental protection barrier to prevent external dust, mud and other impurities from entering the PTO chamber, thus fundamentally extending the service life of the bearing.

[0016] The inclined oil return groove allows lubricating oil to flow smoothly back to the oil chamber, effectively reducing local pressure at the oil seal, preventing the oil seal from bulging and deforming due to oil accumulation, and improving operational safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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 the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional view of a PTO component assembly with an anti-damage and shock structure.

[0019] Figure 2 A three-dimensional schematic diagram of a PTO component with an anti-damage and shock structure;

[0020] Figure 3 A three-dimensional schematic diagram of the oil hole in the PTO chamber;

[0021] Figure 4 A three-dimensional schematic diagram of a PTO gear spline;

[0022] Figure 5 A three-dimensional schematic diagram of the transmission sleeve spline and positioning holes;

[0023] Figure 6 A three-dimensional schematic diagram of the PTO chamber return oil tank;

[0024] Figure 7 This is an enlarged schematic diagram of the gap between the double-row self-aligning roller bearing and the end face of the PTO inner bore.

[0025] Figure 8 Enlarged schematic diagram of adding an oil return groove to the oil seal in the PTO chamber.

[0026] In the diagram, 1-PTO chamber; 2-sealing ring; 3-double row self-aligning roller bearing; 4-deep groove ball bearing; 5-spacer; 6-oil seal; 7-bearing retainer ring 1; 8-bearing retainer ring 2; 9-PTO gear shaft; 10-shield; 11-bolt; 12-transmission sleeve. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Example

[0029] like Figure 1-8 As shown, this embodiment provides a PTO assembly with an anti-impact structure, including a PTO chamber 1, a double-row self-aligning roller bearing 3 disposed at the front end of the PTO chamber 1, a deep groove ball bearing 4 disposed at the rear end of the PTO chamber 1, and a PTO gear shaft 9 fixed inside the PTO chamber 1.

[0030] Specifically, the front end of the PTO chamber 1 has a cylindrical through-hole structure, which houses a double-row self-aligning roller bearing 3. This bearing structure has strong resistance to axial impact loads in the horizontal direction as shown in the figure, and also has good freedom and flexibility in the vertical direction as shown in the figure, enabling it to adapt to high-turbulence working environments. The rear end of the PTO chamber 1 is equipped with a deep groove ball bearing 4, which has strong floating ability in the vertical direction, helping to enhance the dynamic response of the entire assembly.

[0031] The PTO gear shaft 9 passes through the two bearings mentioned above. Its front end is supported by the self-aligning roller bearing 3, and its rear end is positioned by the deep groove ball bearing 4. Finally, it maintains a stable fit with the inner hole of the PTO chamber 1 through the bearing positioning rings 7 and 8, and is connected to the transmission sleeve 12 at the tail end by the gasket 10 and the bolt 11 to form a stable power output structure.

[0032] The bearing arrangement in this embodiment is a combination of front roller bearings and rear ball bearings, which is beneficial for maintaining the precise positioning and low-wear operation of the PTO assembly under high engine temperature and high deflection load, and significantly improves its impact resistance and service life. Example

[0033] This embodiment is a further optimization based on Embodiment 1, specifically:

[0034] The PTO chamber 1 is equipped with an oil return groove extending from the bearing mounting position to the oil seal 6 to enhance the lubricating oil return capability of the PTO assembly under high-speed rotation conditions.

[0035] Specifically, such as Figure 2 As shown, the oil return groove is located in the upper region of the cylindrical through hole in the inner hole of the PTO chamber 1, and adopts an inclined channel structure, extending from the rear deep groove ball bearing 4 to the mounting surface of the oil seal 6. This design can effectively guide the lubricating oil thrown out by the deep groove ball bearing 4 during high-speed operation and prevent the lubricating oil from accumulating at the front end of the oil seal 6.

[0036] Under high temperature and high speed conditions, the flow rate of lubricating oil increases. If the oil return is not smooth, oil can easily accumulate at the front end of the oil seal, causing a sudden increase in oil pressure. Once the pressure exceeds the sealing limit of the oil seal, oil leakage will occur. This structure effectively reduces the pressure at the seal by setting a through-type oil return groove, extending the life of the oil seal and improving the sealing performance of the component.

[0037] In summary, this embodiment, by optimizing the oil return path and in conjunction with the bearing arrangement in Embodiment 1, further improves the stability and safety of the PTO assembly under high load and continuous operation scenarios. Example

[0038] This embodiment is a further optimization based on Embodiment 2, specifically:

[0039] The inner ring structure of oil seal 6 is in direct contact with the outer circle of PTO gear shaft 9, forming a high-precision dynamic sealing interface, which further improves the sealing effect and operational reliability.

[0040] Specifically, such as Figure 3 As shown, the shaft portion of the PTO gear shaft 9 is machined with high precision, and the surface finish of the outer diameter reaches Ra0.4, providing excellent contact sealing conditions. The oil seal 6 is assembled at the rear sealing position of the PTO chamber 1, and its inner ring directly fits against the outer diameter of the PTO gear shaft 9 to form a dynamic seal.

[0041] This structural design offers two advantages:

[0042] On the one hand, because the PTO gear shaft surface is smooth and has no mechanical runout, it can significantly improve the stability of the sealing contact and the service life of the oil seal, and reduce oil film loss; on the other hand, because the gear 9 shaft is jointly positioned by the bearings 3 and 4 at both ends, its axial and radial swing is minimal, and the sealing contact surface is minimally affected by disturbance during operation.

[0043] This embodiment is particularly suitable for dynamic sealing requirements in high-turbulence scenarios. Combined with the aforementioned oil return groove structure, it can maintain stable oil seal without leakage for a long time without affecting lubrication, thereby improving the overall sealing level and durability of the PTO assembly. Example

[0044] This embodiment is a further optimization based on Embodiment 3, specifically:

[0045] Oil seal 6 is installed at the rear end of PTO chamber 1 to form an effective isolation structure from the external environment, thereby improving the dust and pollution resistance of the PTO module.

[0046] Specifically, such as Figure 4 As shown, the oil seal 6 is located at the outermost end of the PTO assembly, at the tail outlet of the PTO chamber 1. This oil seal not only serves as a lubricant and sealant but also acts as a physical barrier to prevent dust, sand, and other particles from the outside air from entering the PTO chamber 1.

[0047] In outdoor or harsh operating conditions, the engine exhaust is often exposed to complex environments such as dust, rain, and mud. The sealing structure of traditional PTO components is mostly located inside, making it difficult to prevent the intrusion of external particulate impurities. This can easily cause contamination and wear of bearings 3 and 4, leading to shortened lifespan or even failure.

[0048] This embodiment places the oil seal 6 on the outermost layer of the entire structure, upgrading the sealing structure from "internal protection" to "front-end protection," achieving a triple barrier function of dustproof, mudproof, and waterproof, and significantly improving the service life and stability of the PTO component in extreme environments.

[0049] The above embodiments describe the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Modifications and variations made by those skilled in the art without departing from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A PTO component assembly with an anti-shock structure, characterized in that, The device includes a PTO chamber (1) with a bearing mounting hole running through it in the front-to-back direction; a first bearing located at the front end of the bearing mounting hole, which is a double-row self-aligning roller bearing (3), used to enhance the axial impact load bearing capacity; a second bearing located at the rear end of the bearing mounting hole, which is a deep groove ball bearing (4), used to provide radial support and operational flexibility; a PTO gear shaft (9) running through the first bearing and the second bearing and supported thereon; an oil seal (6) installed at the rear end of the PTO chamber (1), the inner ring of the oil seal (6) making sealing contact with the outer circular surface of the PTO gear shaft (9) to form a dynamic sealing structure; an oil return groove is provided between the second bearing and the oil seal (6) in the PTO chamber (1) to guide the lubricating oil backflow and prevent pressure accumulation in the sealing area; wherein, the oil seal (6) is located on the outer side of the rear end of the PTO chamber (1) to prevent external dust and impurities from entering the interior of the PTO chamber (1).

2. The PTO component assembly with shock-resistant structure according to claim 1, characterized in that, A gap is provided between the outer ring of the first bearing and the end face of the bearing mounting hole of the PTO chamber (1) to allow the bearing to be finely adjusted to absorb dynamic load offset.

3. A PTO component assembly with an anti-impact structure according to claim 1, characterized in that, The outer rings of the first and second bearings are interference-fitted with the inner hole of the PTO chamber (1), and the inner rings are interference-fitted with the PTO gear shaft (9). A spacer (5) is provided between the two bearings, and the spacer (5) is clearance-fitted with the bearing.

4. A PTO component assembly with an anti-impact structure according to claim 1, characterized in that, The PTO gear shaft (9) is precision machined, and the surface roughness of the outer cylindrical surface is no greater than Ra0.4, so as to improve the sealing performance with the oil seal (6).

5. A PTO component assembly with an anti-impact structure according to claim 1, characterized in that, The oil return groove is an obliquely arranged through channel that extends from the second bearing installation area to the oil seal (6) installation area.

6. A PTO component assembly with an anti-shock structure according to claim 1, characterized in that, It also includes a transmission sleeve (12) fixedly connected to the tail of the PTO gear shaft (9). The transmission sleeve (12) is connected to the PTO gear shaft (9) through an internal spline and locked by a bolt (11). The locking process is achieved by the combined action of the washer (10) and the bolt (11).

7. A PTO component assembly with an anti-impact structure according to claim 1, characterized in that, The oil seal (6) is made of elastic material and has high temperature resistance and high pressure resistance. The oil seal (6) forms an axial dynamic seal with the PTO gear shaft (9). The oil seal (6) is located at the outer end of the PTO chamber (1) to isolate dust and sand from the external environment.

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