Three-ring bearing special for printing machine
By designing a special three-ring bearing for printing presses, optimizing the clearance and structure of each part, the problem of increasing rotational torque or not rotating of the printer cylinder support when the temperature rises, achieving higher assembly accuracy and rotational stiffness.
Patent Information
- Application Number
- CN202422094342.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-28
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-08-28
AI Technical Summary
The existing printing press cylinder support structures lead to the risk of increased rotational torque or non-rotation when the temperature rises.
A three-ring bearing special for printing machines is designed, including bearing inner ring, short cylindrical roller, eccentric central ring, needle roller body and needle roller bearing outer ring. By optimizing the clearance and structure of each part, it ensures that appropriate clearance and rotational stiffness are maintained during temperature changes.
It improves assembly operation accuracy, reduces processing difficulty, reduces structural size, increases rolling stiffness, adapts to printing pressure requirements, and avoids the problem of increasing rotation torque or not rotating.
Smart Images
Figure CN222977251U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of printing press equipment and relates to a special three-ring bearing for a printing press. Background Art
[0002] The roller support of a printing press adopts a rolling bearing. Since the roller clutch is required, the outer race of the roller bearing needs to adopt an eccentric structure. As Figure 1 shown, in order to ensure the flexible rotation of the outer ring, there must be a certain gap between the outer ring and the frame. This structure increases the error and processing difficulty due to the fit between the bearing and the raceway, and a gap must be ensured between the raceway and the frame. When the temperature of the operating bearing rises, the gap between the raceway and the frame will inevitably become smaller, resulting in an increase in rotational torque or the risk of non-rotation. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a special three-ring bearing for a printing press, which solves the problem of increased rotational torque or non-rotation in the prior art.
[0004] The technical solution adopted by the utility model is that the special three-ring bearing for a printing press includes a bearing inner ring, short cylindrical rollers, an eccentric middle ring, needle bodies, and a needle bearing outer ring that are sleeved in sequence from the inside out. The eccentric middle ring is the outer race of the short cylindrical rollers and at the same time is the inner race of the needle bodies. The short cylindrical rollers are provided with a cage.
[0005] The characteristics of the present invention also lie in that
[0006] The bearing inner ring adopts a tapered hole shape with a taper of 1:30.
[0007] The radial clearance between the eccentric middle ring and the short cylindrical rollers is 0.010 mm to 0.020 mm.
[0008] The radial clearance between the eccentric middle ring and the needle bodies is 0 to 0.005 mm.
[0009] The size of the needle bearing outer ring is the standard size ±0.005 mm.
[0010] The cage is a copper material cage that meets the bearing standard.
[0011] The beneficial effects of the utility model are as follows:
[0012] The special three-ring bearing for a printing press of the utility model can improve the assembly and operation accuracy, reduce the processing difficulty, reduce the fit clearance (small interference) between the raceway and the frame, change the sliding bearing of the outer ring to a rolling bearing, reduce the structural size, can increase the size of the roller shaft head, increase the rolling stiffness, and is more beneficial to the printing pressure. Description of the Drawings
[0013] Figure 1It is a schematic structural diagram of a rolling bearing for supporting the cylinder of an existing printing press;
[0014] Figure 2 It is a schematic structural diagram of a special three-ring bearing for a printing press of the present utility model.
[0015] In the figure, 01. outer ring of needle roller bearing, 02. bearing inner ring, 04. short cylindrical roller, 06. cage, 24. needle body, 22. eccentric middle ring. Specific embodiments
[0016] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] Embodiment 1
[0018] This embodiment provides a special three-ring bearing for a printing press, which includes a bearing inner ring 02, a short cylindrical roller 04, an eccentric middle ring 22, a needle body 24, and an outer ring of needle roller bearing 01 that are sleeved in sequence from the inside to the outside. The eccentric middle ring 22 is the outer ring of the short cylindrical roller 04, and at the same time, the eccentric middle ring 22 is the inner ring of the needle body 24. The short cylindrical roller 04 is provided with a cage 06. This bearing is a combined bearing. The inner ring adopts the bearing structure of the short cylindrical roller 04, cancels the seat ring and the original bearing outer ring of the existing rolling bearing, and replaces them with the eccentric middle ring 22. The outer ring adopts the bearing structure of the needle body 24.
[0019] Embodiment 2
[0020] This embodiment provides a special three-ring bearing for a printing press, which includes a bearing inner ring 02, a short cylindrical roller 04, an eccentric middle ring 22, a needle body 24, and an outer ring of needle roller bearing 01 that are sleeved in sequence from the inside to the outside. The eccentric middle ring 22 is the outer ring of the short cylindrical roller 04, and at the same time, the eccentric middle ring 22 is the inner ring of the needle body 24. The eccentricity of the eccentric middle ring 22 has two specifications of 3.5 mm and 7 mm according to design requirements. The short cylindrical roller 04 is provided with a cage 06. On the basis of Embodiment 1, the bearing inner ring 02 adopts a tapered hole shape with a taper of 1:30, and the clearance of the short cylindrical roller 04 can be changed by changing the axial dimension in combination with the cylinder.
[0021] Embodiment 3
[0022] This embodiment provides a special three-ring bearing for a printing press, which includes a bearing inner ring 02, short cylindrical rollers 04, eccentric middle rings 22, needle bodies 24, and needle bearing outer rings 01 that are sleeved in sequence from the inside out. The eccentric middle ring 22 is the outer ring of the short cylindrical roller 04, and at the same time, the eccentric middle ring 22 is the inner ring of the needle body 24. The short cylindrical roller 04 is provided with a cage 06. On the basis of Embodiment 1, the radial clearance between the eccentric middle ring 22 and the short cylindrical roller 04 is 0.010 mm to 0.020 mm, the radial clearance between the eccentric middle ring 22 and the needle body 24 is 0 to 0.005 mm, and the size of the needle bearing outer ring 01 is the standard size ±0.005 mm.
[0023] Embodiment 4
[0024] This embodiment provides a special three-ring bearing for a printing press, which includes a bearing inner ring 02, short cylindrical rollers 04, eccentric middle rings 22, needle bodies 24, and needle bearing outer rings 01 that are sleeved in sequence from the inside out. The eccentric middle ring 22 is the outer ring of the short cylindrical roller 04, and at the same time, the eccentric middle ring 22 is the inner ring of the needle body 24. The short cylindrical roller 04 is provided with a cage 06. On the basis of Embodiment 1, the above components are all made of bearing steel materials, and it is ensured that the hardness and heat treatment meet the national standards for rolling bearings, reaching 58 - 63 HRC. The cage 06 is a copper material cage that meets the bearing standards.
[0025] For the special three-ring bearing of the printing press of the present utility model, the inner ring uses a tapered ring, that is, the bearing inner ring 02 is tightened to eliminate the inner ring bearing clearance, and the bearing clearance is ensured by axially pressing the tapered ring. The life of the bearing usually ensures that the clearance is between 0 and -0.02 mm. Considering the temperature rise during operation of this bearing, the clearance after assembly is designed to be -0.005 mm to 0 mm. After stable operation, the temperature rise of the bearing gradually decays from the inside out. Therefore, the actual clearance of the inner ring bearing after normal operation is -0.015 mm to -0.005 mm; the outer ring bearing is a needle bearing, and an interference fit of 0.01 mm needs to be ensured with the machine frame during assembly. Since the interference will be transmitted inward, the outer ring will become smaller by about 0.007 mm, and at the same time, the inner ring will expand by about 0.003 mm. Therefore, the actual clearance of the outer ring bearing after normal operation is -0.015 mm to -0.005 mm.
[0026] The combined bearing of the present utility model ensures the assembly accuracy through the above assembly clearances. During operation, the inner ring rotates at a high speed, with a speed of 700 revolutions per minute. When the outer ring bearing needs to be disengaged and engaged during operation, it rotates at an angle not greater than 30°, and the action frequency is about 20 times per day.
[0027] From the above content, it can be seen that the special three-ring bearing for the printing press of the present utility model meets the usage requirements of the printing press and improves the printing accuracy.
Claims
1. Three-ring bearing for printing press, characterized by: The invention comprises a bearing inner ring (02), a short cylindrical roller (04), an eccentric middle ring (22), a needle roller body (24), and a needle roller bearing outer ring (01) which are sleeved in sequence from the inside to the outside. The eccentric middle ring (22) is the outer ring of the short cylindrical roller (04), and the eccentric middle ring (22) is the inner ring of the needle roller body (24). The short cylindrical roller (04) is provided with a retaining frame (06).
2. The three-ring bearing for printing press according to claim 1, characterized in that: The bearing inner ring (02) adopts a tapered hole shape with a taper of 1:
30.
3. The three-ring bearing for printing press according to claim 1, characterized in that: The radial clearance between the eccentric middle ring (22) and the short cylindrical roller (04) is 0.010 mm to 0.020 mm.
4. The three-ring bearing for printing press according to claim 1, characterized in that: The radial clearance between the eccentric middle ring (22) and the needle roller (24) is 0 to 0.005 mm.
5. The three-ring bearing for printing press according to claim 1, characterized in that: The size of the needle roller bearing outer ring (01) is standard size ±0.005 mm.
6. The three-ring bearing for printing press according to claim 1, characterized in that: The retaining frame (06) is a copper material retaining frame that meets the bearing standards.