PTO tapered roller bearing clearance adjusting method
By adjusting the assembly and tightening steps of the threaded sleeve and bearing housing, the problem of axial clearance control for PTO tapered roller bearings was solved, achieving stable assembly and long-term reliability of the bearings, simplifying the operation process and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-30
- Publication Date
- 2026-04-14
AI Technical Summary
Existing technologies cannot effectively control the axial clearance of PTO tapered roller bearings, leading to high-temperature ablation of the bearings, gear shaft misalignment, and oil seal leakage. Furthermore, assembly is complex and costly.
By adjusting the steps of assembling the adjusting sleeve with the bearing housing, installing the tapered roller bearing, fixing the flywheel housing, assembling the bearing housing with the flywheel housing, and loosening and tightening the adjusting sleeve, we ensure that the outer ring of the bearing fits tightly with the adjusting sleeve, eliminate the influence of thread clearance, and prevent changes in bearing clearance.
This achieves a zero-clearance fit between the bearing outer ring and the bearing rollers, ensuring that the bearing clearance remains unchanged during long-term use, improving assembly efficiency and reliability, and reducing operational complexity and cost.
Smart Images
Figure CN121854530A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the PTO interface on an engine, and in particular to a method for adjusting the clearance of a PTO tapered roller bearing. Background Technology
[0002] Currently, more and more engines are being used in special-purpose vehicles. Some of these vehicles require engines with a PTO (Power Take-Off) interface for hydraulic pumps. Because hydraulic pumps require high torque, ordinary deep groove ball bearings cannot meet reliability requirements. While tapered roller bearings can meet these requirements, they require high precision in controlling axial clearance. Excessive axial interference can lead to high-temperature erosion of the bearing, while excessive axial clearance can cause axial and radial runout of the gear shaft, resulting in increased noise and oil seal leakage. To address these issues, control is typically achieved by adjusting the manufacturing precision of components or by adding shims during assembly based on actual measured axial clearance. However, this method suffers from difficulties in ensuring accuracy, high cost, complex operation, and low assembly efficiency. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a method for adjusting the clearance of PTO tapered roller bearings.
[0004] The objective of this invention is achieved through the following technical solution: a method for adjusting the clearance of a PTO tapered roller bearing, comprising the following steps: S1: Assemble the adjusting screw sleeve with the bearing housing. Pre-install the adjusting screw sleeve onto the bearing housing so that the rear end face of the adjusting screw sleeve fits against the stepped surface of the front end of the bearing housing. S2: Tapered roller bearing installation: Install the outer ring of the tapered roller bearing into the bearing housing in step S1, and make the front end face of the outer ring of the tapered roller bearing fit against the rear end face of the adjusting sleeve. Install the inner ring of the tapered roller bearing on the shaft of the output gear, and make the rear end face of the inner ring of the tapered roller bearing abut against the stepped end face on the output gear. Install the bearing rollers of the tapered roller bearing on the inner ring. S3: Flywheel housing installation. Install the flywheel housing onto the gear chamber and tighten it with the locking screw. S4: Assemble the bearing housing and flywheel housing. Install the bearing housing from step S2 onto the flywheel housing from step S3. At this time, after the outer ring of the tapered roller bearing is pressed against the bearing roller, there is an installation gap between the bearing housing and the flywheel housing. S5: Loosen the adjusting sleeve to create a loosening gap, which is greater than the installation gap. Then tighten the screws to make the rear end face of the bearing housing fit against the front end face of the flywheel housing. S6: Tighten the adjusting sleeve again so that the front end face of the outer ring of the tapered roller bearing is in contact with the rear end face of the adjusting sleeve, and lock the fastening screw on the adjusting sleeve to ensure the stability of the relative position between the bearing housing and the adjusting sleeve.
[0005] Optionally, in step S6, after the adjusting sleeve is tightened, there is a backlash gap between the front end face of the thread of the adjusting sleeve and the rear end face of the thread of the bearing seat. Then the adjusting sleeve is loosened, and the axial distance of the loosening of the adjusting sleeve is consistent with the backlash gap. Finally, the fastening screw is tightened.
[0006] Optionally, the callback interval is 1 / 6 of a pitch.
[0007] Optionally, the loosening gap can be greater than 1.2mm.
[0008] Optionally, the adjusting sleeve has twelve screw holes, which are evenly distributed on the same circumference.
[0009] Optionally, there are nine fastening screws, and the nine fastening screws are installed in the corresponding screw holes, and the three screw holes at the bottom of the adjusting screw sleeve are oil return holes.
[0010] Optionally, the first bearing can be installed in the gear chamber before assembling the adjusting sleeve and bearing housing.
[0011] The present invention has the following advantages: The PTO tapered roller bearing clearance adjustment method of the present invention involves pre-installing the outer ring of the tapered roller bearing and the adjusting sleeve onto the bearing housing, then installing the bearing housing onto the flywheel housing. First, the adjusting sleeve is loosened, then the bearing housing bolts are tightened. After the bearing housing is in place, the adjusting sleeve is tightened to ensure a tight fit between the adjusting sleeve and the bearing outer ring. This ensures that the bearing outer ring and bearing rollers always have a zero-clearance fit. Furthermore, loosening the adjusting sleeve before using the fastening screws effectively eliminates the influence of thread clearance. After the fastening screws are installed, the adjusting sleeve will not rotate or loosen, ensuring that the bearing clearance does not change during product use and guaranteeing long-term product use. Attached Figure Description
[0012] Figure 1 This is an assembly diagram of the present invention; Figure 2 This is an assembly cross-sectional view of the present invention; In the diagram: 1-Gear chamber, 2-First bearing, 3-Flywheel housing, 4-Bearing housing, 5-Tap roller bearing, 6-Output gear, 7-Adjusting sleeve, 8-Fasting screw. Detailed Implementation
[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0014] Therefore, the following detailed description of the embodiments of the 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 invention without inventive effort are within the scope of protection of the invention.
[0015] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other.
[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0017] In the description of this invention, it should be noted that the terms "center," "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, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this invention 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, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0018] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 invention based on the specific circumstances.
[0019] like Figure 1 and Figure 2As shown, a method for adjusting the clearance of a PTO tapered roller bearing includes the following steps: before assembling the adjusting sleeve 7 with the bearing housing 4, the first bearing 2 is first installed in the gear chamber 1. S1: Assemble the adjusting screw sleeve 7 with the bearing housing 4, pre-install the adjusting screw sleeve 7 onto the bearing housing 4, so that the rear end face of the adjusting screw sleeve 7 fits against the stepped surface of the front end of the bearing housing 4; S2: Installation of tapered roller bearing 5: Install the outer ring of tapered roller bearing 5 into bearing housing 4 in step S1, and make the front end face of the outer ring of tapered roller bearing 5 fit against the rear end face of adjusting sleeve 7. Install the inner ring of tapered roller bearing 5 on the shaft of output gear 6, and make the rear end face of the inner ring of tapered roller bearing 5 abut against the stepped end face on output gear 6. Install the bearing rollers of tapered roller bearing 5 on the inner ring. S3: Flywheel housing 3 installation: Install the flywheel housing 3 on the gear chamber 1 and lock it in place with the locking screw; S4: The bearing housing 4 is assembled with the flywheel housing 3. The bearing housing 4 in step S2 is installed on the flywheel housing 3 in step S3. At this time, after the outer ring of the tapered roller bearing 5 is pressed against the bearing roller, there is an installation gap between the bearing housing 4 and the flywheel housing 3. In this embodiment, when the axial clearance of the tapered roller bearing 5 is 0, the protrusion of the outer ring of the tapered roller bearing 5 relative to the bearing housing 4 is 1.2mm. S5: Loosen the adjusting sleeve 7 to create a loosening gap, which is greater than the installation gap. That is, the adjusting sleeve 7 should be loosened by more than 1.2mm. After the adjusting sleeve 7 is loosened, the outer ring of the tapered roller bearing 5 will not interfere with the installation of the bearing housing 4. Therefore, the rear end face of the bearing housing 4 can be made to fit with the front end face of the flywheel housing 3 by tightening the screw. At this time, the outer ring of the tapered roller bearing 5 is loose and does not axially press the bearing rollers. S6: Tighten the adjusting sleeve 7 again, so that the front end face of the outer ring of the tapered roller bearing 5 is in contact with the rear end face of the adjusting sleeve 7, and lock the fastening screw 8 on the adjusting sleeve 7 to ensure the stability of the relative position between the bearing housing 4 and the adjusting sleeve 7. At this time, in the axial direction, the front end face of the outer ring of the tapered roller bearing 5 may be squeezed by the rear end face of the adjusting sleeve 7. After the outer ring is squeezed, the axial interference between the outer ring and the bearing roller may be too large, and the bearing is prone to high temperature erosion. Therefore, in step S6, after the adjusting sleeve 7 is tightened, the front end face of the thread of the adjusting sleeve 7 and the bearing... The rear end face of the thread of seat 4 has a backlash clearance. Then, the adjusting sleeve 7 is loosened, and the axial distance of the loosening of the adjusting sleeve 7 is consistent with the backlash clearance. Finally, the fastening screw 8 is tightened. In this embodiment, when the adjusting sleeve 7 is tightened, the thread of the adjusting sleeve 7 is M140X2. According to actual measurement, the thread clearance is about 0.3mm, while the thread width is 2mm. Therefore, preferably, the backlash clearance is 1 / 6 of the thread pitch. After the adjusting sleeve 7 is loosened, the adjusting sleeve 7 is then pressed and fixed with the fastening screw 8, thereby eliminating the influence of the thread clearance between the adjusting sleeve 7 and the bearing seat 4 on the tapered roller bearing 5.
[0020] In this embodiment, as Figure 1 and Figure 2 As shown, the adjusting sleeve 7 has twelve screw holes, which are evenly distributed on the same circumference. Preferably, there are nine fastening screws 8, and the nine fastening screws 8 are installed in the corresponding screw holes. The three screw holes at the bottom of the adjusting sleeve 7 are oil return holes.
[0021] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.
Claims
1. A method for adjusting the clearance of a PTO tapered roller bearing, characterized in that: Includes the following steps: S1: Assemble the adjusting screw sleeve with the bearing housing, pre-install the adjusting screw sleeve onto the bearing housing, so that the rear end face of the adjusting screw sleeve fits against the stepped surface of the front end of the bearing housing; S2: Tapered roller bearing installation: Install the outer ring of the tapered roller bearing into the bearing housing in step S1, and make the front end face of the outer ring of the tapered roller bearing fit against the rear end face of the adjusting sleeve. Install the inner ring of the tapered roller bearing on the shaft of the output gear, and make the rear end face of the inner ring of the tapered roller bearing abut against the stepped end face on the output gear. Install the bearing rollers of the tapered roller bearing on the inner ring. S3: Flywheel housing installation. Install the flywheel housing onto the gear chamber and tighten it with the locking screw. S4: Assemble the bearing housing and flywheel housing. Install the bearing housing from step S2 onto the flywheel housing from step S3. At this time, after the outer ring of the tapered roller bearing is pressed against the bearing roller, there is an installation gap between the bearing housing and the flywheel housing. S5: Loosen the adjusting screw sleeve to form a loosening gap, which is greater than the installation gap. Then tighten the screw to make the rear end face of the bearing housing fit with the front end face of the flywheel housing. S6: Tighten the adjusting sleeve again so that the front end face of the outer ring of the tapered roller bearing is in contact with the rear end face of the adjusting sleeve, and lock the fastening screw on the adjusting sleeve to ensure the stability of the relative position between the bearing housing and the adjusting sleeve.
2. The method for adjusting the clearance of a PTO tapered roller bearing according to claim 1, characterized in that: In step S6, after the adjusting sleeve is tightened, there is a backlash gap between the front end face of the thread of the adjusting sleeve and the rear end face of the thread of the bearing seat. Then the adjusting sleeve is loosened, and the axial distance of the loosening of the adjusting sleeve is consistent with the backlash gap. Finally, the fastening screw is tightened.
3. The method for adjusting the clearance of a PTO tapered roller bearing according to claim 2, characterized in that: The callback gap is 1 / 6 of a screw pitch.
4. The method for adjusting the clearance of a PTO tapered roller bearing according to claim 2, characterized in that: The rewind spacing is greater than 1.2 mm.
5. A method for adjusting the clearance of a PTO tapered roller bearing according to claim 2, characterized in that: The adjusting sleeve has twelve screw holes, which are evenly distributed on the same circumference.
6. The method for adjusting the clearance of a PTO tapered roller bearing according to claim 5, characterized in that: There are nine fastening screws, and the nine fastening screws are installed in corresponding screw holes, and the three screw holes at the bottom of the adjusting screw sleeve are oil return holes.
7. A method for adjusting the clearance of a PTO tapered roller bearing according to any one of claims 1-6, characterized in that: Before adjusting the assembly of the sleeve and bearing housing, first install the first bearing in the gear chamber.