CN101865289A - End face equal depth rectangular groove sealing ring - Google Patents

Abstract

The invention is a rotary sealing ring applied in a wet clutch. The traditional sealing ring is prone to severe wear and tear under high PV conditions, which leads to the failure of the sealing ring, and then makes the wet clutch lose its engaging function. The invention adopts the method of opening equal-depth rectangular grooves on the end surface of the sealing ring to provide sufficient lubricating medium for the frictional working surface and generate dynamic pressure lubrication, thereby greatly improving the working performance of the sealing ring. The method is simple, effective and easy to popularize, and solves a key technical problem for the design of high-speed and high-pressure wet clutches.

Description

End face equal depth rectangular groove sealing ring

technical field

The invention belongs to a liquid rotary sealing part, more specifically a rotary sealing ring applied in a wet clutch.

Background technique

The allowable PV value of the rotary seal ring used in the current wet clutch is relatively low. When the PV value rises, the sealing end face of the rotating sealing ring will experience rapid wear and thermal cracking, resulting in failure of the rotating sealing ring, and indirectly causing the wet clutch to lose its bonding function. Therefore, without changing the size of the rotating sealing ring, if the working PV value of the rotating sealing ring can be increased, the working oil pressure and working speed of the wet clutch will also be improved, so the wet clutch can be arranged on the high-speed shaft, Optimize the layout of the internal components of the mechanical transmission.

Contents of the invention

The purpose of the present invention is to address the above problems, adopt the method of opening a rectangular groove on the sealing end face, improve the allowable pressure and the upper limit of the rotating speed of the sealing ring, thereby improving its working PV value and working stability, and for high rotating speed, high control Pressure clutch design provides seal protection.

The technical solution adopted by the present invention to solve the technical problem is: by opening a rectangular groove on the end surface of the sealing ring, sufficient hydraulic oil is introduced into the sealing end surface to enhance the lubrication effect; the rectangular groove can generate a step effect in the flow field, making the fluid dynamic Pressure lubrication to improve the working performance of the sealing surface. In order to make the seal ring meet different usage requirements under different working conditions, the size and distribution of the seal ring have the following requirements: the length of the rectangular groove is between 0.1 and 0.9 times the difference between the inner and outer radii of the seal ring; The width of the rectangular groove is between 0.5mm and 5mm; the distribution of the rectangular grooves is evenly distributed in the circumferential direction, and the angle between the centerlines of two adjacent grooves is between 1° and 90°; the depth of all the rectangular grooves is equal, And the depth of each groove is constant, the depth of the rectangular groove is between 0.2 and 0.8 times the thickness of the sealing ring; the ratio of the thickness of the sealing ring to the difference between the inner and outer radii is between 0.5 and 1.5.

Beneficial effects of the present invention: the patent of the present invention can improve the performance of the seal ring without changing the general size of the existing rotary seal ring, which is simple, practical, and easy to implement, and is suitable for various wet clutches for vehicles and other rotary oils. Sealed occasions.

Description of drawings

Fig. 2 is a front view of a rotary sealing ring for a wet clutch of the present invention;

Fig. 1 is the A-A view of Fig. 2;

Fig. 3 is the B direction view of Fig. 2;

Fig. 4 is the installation state of the rotary sealing ring in the wet clutch.

In Figures 1 to 4: 1-equal-depth rectangular groove, 2-sealing ring joint, 3-oil inlet sleeve, 4-sealing ring, 5-sealing ring installation groove, 6-oil distribution sleeve, 7-friction end face, 8 -imported oil.

Parameter description in the figure: r ₀ is the inner diameter of the sealing ring, r ₁ is the outer diameter of the sealing ring, c is the length of the rectangular groove, a is the width of the rectangular groove, h is the depth of the rectangular groove, b is the thickness of the sealing ring, d is Lap interface gap, dr is diameter difference.

Detailed ways

See Figure 4, which shows the installation state of the rotary seal ring in the wet clutch. As shown in the figure, (8) in the figure is the oil inlet of the clutch. The oil inlet sleeve (3) is used to supply oil to the wet clutch, and the oil inlet sleeve is non-rotating; the oil distribution sleeve (6) is used to supply oil to the wet clutch. The piston cylinder of the clutch distributes oil, and the oil distribution sleeve rotates together with the clutch shaft; the outer circular surface of the oil distribution sleeve (6) has a sealing ring installation groove (5), and the rotating sealing ring is just installed in this groove. Before assembly, the oil inlet sleeve (3) and the oil distribution sleeve (6) need to be separated; then the rotating seal ring (4) should be stretched and inserted into the seal ring installation grooves on the outer circle of the oil distribution sleeve (6) (5), note that the side with the rectangular groove (1) on the seal ring (4) must face the friction end face (7) on the oil distribution sleeve; finally, place the The oil sleeve (6) is inserted into the oil sleeve (3) to complete the installation of the rotary seal ring.

When the sealing ring is working, the equal-depth rectangular groove (1) with a width between 0.5mm and 5mm introduces high-pressure control oil into the sealing end face (7); at the same time, the oil pressure of the control oil can provide certain static pressure support for the sealing ring; The rotation of the oil distribution sleeve (6) makes the oil around the equal-depth rectangular groove (1) move relative to the equal-depth rectangular groove (1). ) The dynamic pressure effect of the oil seal end face (7). The superposition of the above three effects can greatly improve the working performance of the sealing ring and prolong its service life at the same time.

Claims (5)

1. A rotary seal ring for a wet clutch, characterized in that: the end face of the seal ring is provided with rectangular grooves of equal depth uniformly distributed in the circumferential direction, and meets a certain width-to-diameter ratio requirement. 2. The rotary sealing ring for a wet clutch according to claim 1, characterized in that: a rectangular groove (1) is formed on the sealing end surface, and the length c of the rectangular groove is between 0.1 times and between 0.9 times, and the width a of the rectangular groove is between 0.5mm and 5mm. 3. The rotary seal ring for wet clutches according to claim 1, characterized in that: the rectangular grooves are evenly distributed in the circumferential direction, and the angle between the centerlines of two adjacent grooves is between 1° and 90°. 4. The rotary seal ring for wet clutches according to claim 1, characterized in that: the depths of all the rectangular grooves are equal, and the depth of each groove is constant, and the depth of the rectangular grooves is between 0.2 and 0.8 times the thickness b between. 5. The rotary seal ring for wet clutch according to claim 1, characterized in that the ratio of the thickness b of the seal ring to the diameter difference dr is between 0.5 and 1.5.

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