CN201836104U - Automobile water pump bearing sealing device with water thrower - Google Patents

Abstract

The utility model relates to a sealing device for an automobile water pump bearing. The sealing member is installed at the junction of the opening end of the space formed between the rotating shaft and the bearing, and is installed in a sealing groove on the outer ring of the bearing through pressure action. The seal is composed of a sealing body, a metal skeleton and a water throwing ring. The sealing body is a three-lip structure, and the sealing is realized through the elastic compression of the main lip, the second auxiliary lip and the water throwing ring 30 and the contact between the first auxiliary lip and the bearing; There is a rectangular drainage groove on the outer ring of the water throwing ring, and the centrifugal water throwing effect is generated during the rotation process, which can effectively prevent water vapor from infiltrating into the bearing. Grease leakage; at the same time, the sealing ring does not deform when it meets cold water, which can prevent the absorption of water vapor and dust outside the bearing caused by the sharp drop in the internal pressure of the bearing when the bearing temperature is cooled from high temperature to room temperature.

Description

Automobile water pump bearing sealing device with water throwing ring

technical field

The utility model relates to an automobile water pump bearing sealing device, in particular to an automobile water pump bearing sealing device with a three-lip structure and a water throwing ring.

Background technique

Commonly used automotive water pump bearing sealing devices are shown in Figure 1: the water pump bearing is evenly installed with multiple rolling elements 1b (ie steel balls) between the rotating shaft 3 and the bearing outer ring 1a, and its function is to bear the load; a cage 1c is used for Fix the above-mentioned rolling elements and space them apart. A seal 2 is composed of a rubber seal 2a and a metal skeleton 2b, wherein the rubber seal 2a is installed in the seal groove 1d of the bearing outer ring 1a to prevent the seal from moving; the lip of the rubber seal 2a is close to Shaft distribution, the main lip 2d is in interference fit with the surface of the rotating shaft 3 to prevent the leakage of grease and the infiltration of foreign matter from the outside; the "Z"-shaped metal skeleton 2b plays the role of support and reinforcement.

Although such a sealing structure can realize the sealing of the lubricating grease of the water pump bearing to a certain extent, since there are only two sealing lips, the sealing effect is not ideal enough. In addition, during the working process of the automobile water pump bearing, the right side of the seal 2 is directly in contact with water. Since the water is under pressure, it will penetrate into the bearing, resulting in a decrease in the lubrication effect of the bearing. In order to improve this phenomenon, there are water pump bearing seals with a water-slinging ring structure, such as the patent "Hydrogenated nitrile rubber seal for water pump bearing (GB2332714A)", "Water pump bearing sealing device (CN1485544A)", etc., these patents use The water throwing ring structure improves the sealing effect of the water pump bearing to a large extent, but the effect achieved by these structures is not optimal, such as: the patent "water pump bearing sealing device (CN1485544A)" has four sealing lips, the structure It is too complicated, and the sealing is realized by the nesting of two seals, wherein the second seal (that is, the water throwing structure) is in contact with the first seal through the elastic sealing lip bonded to it, when the water throwing ring rotates with the shaft At the same time, due to the centrifugal force, the sealing effect and the water rejection effect will be reduced. In addition, the outer ring of the water rejection ring is smooth and cylindrical, which cannot form an effective water rejection effect; the patent "Hydrogenated nitrile rubber seal for water pump bearing( GB2332714A)" is also a three-lip seal structure. The third lip of the seal body is in radial elastic contact with the outer surface of the outer ring of the water throwing ring. The outer ring of the water throwing ring is a smooth cylinder, which also cannot form an effective The problem of water throwing effect.

In recent years, as the performance of engines used in water pumps has improved, the requirements for sealing performance of bearing seals have also increased. The reliability and durability of the bearing seal will directly affect the performance of the bearing. Therefore, effectively improving the sealing performance of the sealed bearing is the premise and key to improving the bearing life.

The early damage of the bearing is often not caused by the material of the bearing, but due to the intrusion of dirt into the bearing, causing point-type peeling on the surface of the channel: that is, immersion of debris → channel indentation → stress concentration → flaky peeling → Bearing failure or water immersion into the bearing → Lubrication failure → Pitting and peeling → Bearing failure.

In view of the importance of water pump bearing seals and the fact that the current bearing seal structure is still not the best, it is necessary to develop a new type of automobile water pump bearing seal structure with better sealing effect and water rejection effect.

Contents of the invention

The invention provides a sealing device with a water throwing ring for sealing the bearing of an automobile water pump, aiming at solving the above problems. This device can greatly improve the function of preventing moisture, foreign particles, and mixtures thereof from intruding into the interior of the bearing, thereby improving the durability of the bearing.

The present invention is achieved through the following technical solutions:

An automobile water pump bearing sealing device, comprising: a bearing 10 mounted on a rotating shaft 40, a plurality of rolling elements 10b evenly installed between the rotating shaft 40 and the bearing outer ring 10a, and a predetermined Spaced cages 10c, a seal 20 is installed at the opening end junction of the space formed between the rotating shaft 40 and the bearing 10, the seal 20 includes a seal body 20a and is closely wedded with the seal body 20a The metal skeleton 20b is characterized in that the sealing body 20a extends a three-lip structure in the direction of the rotating shaft 40 in the radial direction, which are respectively the main lip 20e, the first auxiliary lip 20d, the second auxiliary lip 20c, and the sealing body One end of the metal skeleton 20a close to the bearing 10 is interference-fitted in the sealing groove 10d, one end of the metal skeleton 20b is inserted into the sealing body 20a, and the other end is bent and inserted into the junction of the main lip 20e and the second auxiliary lip 20c; The seal 20 also includes a water throwing ring 30, the water throwing ring 30 includes an inner ring 30c tightly installed on the surface of the rotating shaft 40, an outer ring 30a coaxial with the inner ring 30c and surrounding the inner ring 30c, and a connecting inner ring 30c. 1. The flange 30b of the outer ring, the outer ring 30a is provided with a boss 30e, the boss 30e and the sealing body 20a are in clearance fit, the inner surface of the outer ring 30a is elastically pressed against the second secondary lip 20c, the inner ring 30c The outer surface is elastically pressed against the main lip 20e, and the first auxiliary lip 20d and the rotating shaft 40 maintain a gap that meets the requirements of dynamic fit; on the outer surface of the boss 30e of the outer ring 30a of the water throwing ring, there are 2 or 2 The above rectangular grooves 30d are evenly distributed along the circumference of the boss 30e.

Further optimized technical solutions are:

The radial angle γ between the second auxiliary lip 20c and the metal skeleton 20b is 0°<γ<90°, the angle α between the first auxiliary lip 20d and the main lip 20e is 0°<α<180°, and the main lip The angle β between 20e and the second auxiliary lip 20c is 90°<β<180°.

Another preferred technical solution is:

The depth h of the drainage groove is greater than 0 and smaller than the thickness of the outer ring of the water throwing ring.

Beneficial effect

Compared with the prior art, the present invention can avoid direct contact between the main lip of the seal and the external environment, and at the same time fully remove the moisture around the seal during the shaft rotation, thereby effectively preventing the leakage of grease inside the bearing and external moisture, Intrusion of foreign matter, impurities, etc. At the same time, the invention can avoid the occurrence of the following phenomena: when the bearing runs to a high temperature, the internal pressure of the bearing increases, causing grease leakage; when the bearing stops running, the internal pressure of the bearing drops sharply when the bearing is cooled from high temperature to room temperature, absorbing external water vapor and dust.

During the rotation of the main shaft, the rectangular groove provided on the outer surface of the water throwing ring will produce a centrifugal effect to further throw off the cooling water, and its drainage effect is significantly improved compared with the prior art.

Description of drawings

Fig. 1 is a cross-sectional view of a water pump bearing sealing device in the prior art, and the device is axisymmetrically distributed. Among them, 1 is the bearing, 1a is the outer ring of the bearing, 1b is the rolling body, 1c is the cage, 1d is the sealing groove, 2 is the seal, 2a is the sealing body, 2b is the metal skeleton, 2d is the main lip, 2c is the auxiliary lip, 4 is the axis of rotation;

Fig. 2 is a sectional view of the device of the present invention, which is axisymmetrically distributed. Among them, 10 is the bearing, 10a is the outer ring of the bearing, 10b is the rolling body, 10c is the cage, 10d is the sealing groove, 20 is the seal, 20a is the sealing body, 20b is the metal skeleton, 20e is the main lip, 20d is the second A pair of lips, 20c is the second pair of lips, 30 is the water throwing ring, 30a is the outer ring of the water throwing ring, 30c is the inner ring of the water throwing ring, 30b is the flange connecting the inner and outer rings, 30d is the drainage groove, 30e is the boss on the outer ring 30a of the water rejection ring 30, 30f is the installation gap between the water rejection ring 30 and the seal 20, 40 is the rotating shaft, and 50 is formed by the second secondary lip 20c and the outer ring 30a of the water rejection ring 30 60 is the cavity formed by the main lip 20e, the second auxiliary lip 20c and the flange 30b of the water throwing ring 30, and 70 is the cavity formed by the main lip 20e, the first auxiliary lip 20d and the inner ring 30c of the water throwing ring 30 α is the axial angle between the first auxiliary lip 20d and the rotating shaft 40, β is the axial angle between the main lip 20e and the rotating shaft 40, and γ is the radial angle between the second auxiliary lip 20c and the metal skeleton 20b ;

Fig. 3 is a schematic diagram of the distribution of drainage grooves on the boss of the outer ring of the water rejection ring, wherein 30d is a rectangular drainage groove, which is evenly distributed along the boss 30e of the outer ring 30a of the water rejection ring 30;

Fig. 4 is a schematic diagram of the structure of the drainage groove on the boss of the outer ring of the water throwing ring, wherein 30d is the drainage groove, which is rectangular.

Detailed ways

The present invention will be described in further detail below in conjunction with accompanying drawing and specific embodiment:

According to the design of the present invention, the axial cross-section of the sealing ring 20 of the automobile water pump bearing is shown in FIG. 2 . The inside of the bearing is filled with grease, and the bearing body is composed of an outer ring 10a, rollers 10b installed between the bearing outer ring 10a and the rotating shaft 40, and cages 10c that support and evenly space the rollers 10b. The bearing sealing ring is composed of a sealing member 20 and a water throwing ring 30 . The seal 20 is fixed on the seal groove 10d of the bearing outer ring 10a. The seal 20 includes two parts, a metal skeleton 20b and an elastic sealing body 20a, wherein the elastic sealing body 20a has a three-lip structure: a main lip 20e, a first auxiliary lip 20d and a second auxiliary lip 20c, and a cross-sectional view of the metal skeleton 20b after being fixed It is an improved "Z" shape, which is an annular thin plate, whose outer surface is closely bonded to the sealing body 20a, and the tail extends into the junction of the main lip 20e and the second auxiliary lip 20c, which increases the strength of the entire sealing ring and avoids Press-fitting deformation of the sealing ring.

The elastic sealing body 20a is made of fluorine rubber, and its cross section is trifurcated (as shown in FIG. 2 ). In the figure, the angle between the main lip 20e and the bearing axis α (0°<α<90°); the angle between the first auxiliary lip 20d and the bearing axis β (90°<β<180°); the second auxiliary lip 20c and the metal skeleton Angle γ (0°<γ<90°).

The water throwing ring 30 is made of stainless steel, and is installed on the rotating shaft 40 near the impeller side. The water throwing ring 30 consists of an inner ring 30c that is tightly installed on the surface of the rotating shaft 40, an outer ring 30a and a boss 30e that are coaxial with the inner ring 30c and surround the inner ring, and connect the flange 30b and the outer ring of the inner and outer rings. The boss 30e of 30a is composed of rectangular grooves 30d uniformly distributed along the circumferential direction.

Structurally, the second auxiliary lip 20c of the elastic sealing body 20a is in elastic interference contact with the inner surface of the outer ring 30a of the water throwing ring 30, the main lip 20e is in elastic interference contact with the outer surface of the inner ring 30c, and the first auxiliary lip 20d is in contact with the outer surface of the rotating shaft 40, wherein each contact constitutes a sealing structure.

The present invention has been applied in the WR3258152 type automobile water pump bearing produced by Jiangsu Rongtianle Company. Its working method is: the cooling water or water vapor sprayed into the inside of the bearing sealing ring will be blocked by the outer surface of the water throwing ring 30, along with the shaft Rotation, the groove 30d on the boss 30e of the water throwing ring 30 will produce centrifugal action to further throw off the cooling water, and make a slight negative pressure in the cavity 50 formed by the second secondary lip 20c and the water throwing ring 30, so that Water vapor and foreign matter cannot enter the cavities 60, 70 formed by the sealing lips and the water throwing ring, thereby preventing sealing failure caused by aging or expansion of the sealing member 20 (especially the main lip 20e and the second auxiliary lip 20c).

The first auxiliary lip 20d of the seal 20 seals the grease inside the bearing 10 , while the main lip 20e and the second auxiliary lip 20c further prevent the grease from leaking out under high-speed rotation.

Claims (3)

1. auto pump associated sealing arrangement for bearings, comprise: a bearing (10) that is installed on the running shaft (40), a plurality of rolling elements (10b) that evenly are installed between running shaft (40) and the bearing outer ring (10a), a retainer (10c) that between each rolling element, keeps predetermined interval, a Sealing (20) is installed on the open end junction point in the space that forms between running shaft (40) and the bearing (10), described Sealing (20) comprises seal (20a) and closely carves the metal frame (20b) that closes bonding with seal (20a), it is characterized in that, described seal (20a) radially extends one three procheilon structure towards bearing (40) direction, be respectively main lip (20e), the first secondary lip (20d), the second secondary lip (20c), seal (20a) is installed in the seal groove (10d) near an end interference of bearing (10), seal (20a) is inserted in an end of metal frame (20b), and the other end embeds the junction point of the main lip (20e) and the second secondary lip (20c) agley; Described Sealing (20) also comprises a slinger ring (30), slinger ring (30) comprises the inner ring (30c) of a close installation in running shaft (40) surface, one coaxial and around the outer ring (30a) of inner ring (30c) with inner ring (30c), in being connected, the flange of outer ring (30b), outer ring (30a) is provided with boss (30e), Spielpassung between boss (30e) and the seal (20a), the internal surface of outer ring (30a) and second secondary lip (20c) elastic compression, the outer surface of inner ring (30c) and main lip (20e) elastic compression, the first secondary lip (20d) keeps meeting the gap that requires movingly with running shaft (40); On the outer surface of slinger ring outer ring boss (30e), have 2 or 2 with outer ring, upper edge (30e)) circumferential uniform rectangular recess (30d).

2. auto pump associated sealing arrangement for bearings as claimed in claim 1, it is characterized in that, between the described second secondary lip (20c) and the metal frame (20b) an angle γ radially arranged, γ is 0 °＜γ＜90 °, between the described first secondary lip (20d) and the main lip (20e) an angle α is arranged, α is 0 °＜α＜180 °, between the described main lip (20e) and the second secondary lip (20c) angle β is arranged, and β is 90 °＜β＜180 °.

3. auto pump associated sealing arrangement for bearings as claimed in claim 1 is characterized in that, the degree of depth h of described rectangular recess (30d) is greater than 0 thickness less than the slinger ring outer ring.

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