An adjustable skeleton oil seal sealing structure

Abstract

The present invention relates to an adjustable skeleton oil seal sealing structure, belonging to the field of vehicle transmission technology. The structure includes a small diameter end extending into an annular wheel hub and a planetary carrier, a positioning step in the wheel hub, a first skeleton oil seal outside and a second skeleton oil seal inside are installed in the radial gap between the planetary carrier and the wheel hub, at least the inner end of the second skeleton oil seal is equipped with a tightening adjustment bolt through a threaded hole, the end of the adjustment bolt abuts on the positioning step, and the first skeleton oil seal is positioned by the second skeleton oil seal. Since the relative position of the wheel hub and the planetary carrier remains unchanged after assembly, and the length of the adjustment bolt extending out of the inner end face of the second skeleton oil seal can be adjusted within a certain range as appropriate, the assembly position of the skeleton oil seal relative to the planetary carrier is adjustable, thereby achieving the purpose of staggering the wear groove of the planetary carrier, and ensuring that the seal can still be reliable after long-term operation. The use of the present invention can properly solve the sealing problem after the wear of the planetary carrier in a convenient and cost-effective manner.

Description

Technical Field

[0001] The invention relates to an oil seal sealing structure, in particular to an adjustable skeleton oil seal sealing structure suitable for an output end of a wheel-side reducer, belonging to the technical field of vehicle transmission. Background Art

[0002] The wheel reducer is fixed on the rear axle of the mining dump truck through the planetary carrier. It is one of the core components of the mining dump truck. After the power is input, it is decelerated and torque is increased, and finally the vehicle is driven through the wheel hub output. There is relative rotation between the wheel hub and the planetary carrier. In order to ensure the sealing of the lubricating oil inside the wheel reducer, a sealing structure must be set between the wheel hub and the planetary carrier.

[0003] According to the applicant, the existing sealing structure between the wheel hub and the planetary carrier is realized by a fixed-position skeleton oil seal. Although the worn skeleton oil seal can be replaced at any time after operation, the planetary carrier wears out due to long-term operation and causes grooves and seal oil leakage, which is indeed very difficult to solve. Because the planetary carrier is a large casting and forging, it is expensive and cumbersome to disassemble and assemble, and replacing or repairing the planetary carrier will result in large economic losses. Summary of the invention

[0004] The purpose of the present invention is to provide an adjustable skeleton oil seal sealing structure which can properly solve the problem of planet carrier wear and sealing by adjusting the skeleton oil seal.

[0005] In order to achieve the above purpose, the adjustable skeleton oil seal sealing structure of the present invention includes a small diameter end extending into an annular hub and a planetary carrier, a positioning step is provided in the hub, a first skeleton oil seal outside and a second skeleton oil seal inside are installed in the radial gap between the planetary carrier and the hub, at least the inner end of the second skeleton oil seal is equipped with a tightenable adjusting bolt through a threaded hole, the end of the adjusting bolt abuts against the positioning step, and the first skeleton oil seal is positioned by the second skeleton oil seal.

[0006] Since the relative position of the wheel hub and the planet carrier remains unchanged after assembly, and the length of the adjusting bolt extending from the inner end face of the second skeleton oil seal can be adjusted within a certain range, the assembly position of the second skeleton oil seal and the first skeleton oil seal relative to the planet carrier can be adjusted, thereby achieving the purpose of staggering the wear grooves of the planet carrier and ensuring reliable sealing after long-term operation. It can be seen that the present invention can be used in a convenient and cost-effective manner to properly solve the sealing problem after the planet carrier is worn.

[0007] One of the further improvements of the present invention is that: the outer end of the first skeleton oil seal and the inner end of the second skeleton oil seal are respectively equipped with eight circumferentially evenly distributed tightening bolts and adjusting bolts that can be tightened together; every two adjacent adjusting bolts are formed into a group, which are tightened and pressed on the corresponding adjusting gasket group and the arc-shaped adjusting pressure plate; every two adjacent tightening bolts are formed into a group, which are tightened and pressed on the corresponding tightening gasket group and the arc-shaped tightening pressure plate.

[0008] Further: a circular bolt head countersunk hole is provided on the clamping plate.

[0009] The second further improvement of the present invention is that the threaded holes of the first skeleton oil seal and the second skeleton oil seal are through-holes with the same threaded structure in corresponding positions, the adjusting bolt is composed of a large diameter section and a small diameter section with opposite thread rotation directions, and the clamping bolt is tubular with internal and external threads, and the internal thread matches the external thread of the small diameter section.

[0010] Furthermore, the outer end of the clamping bolt and the large diameter section and small diameter section of the adjusting bolt are respectively provided with corresponding tightening nuts, thereby forming tightenable structures of the clamping bolt and the adjusting bolt respectively.

[0011] A further improvement of the present invention is that a detachable annular baffle is fixedly installed in one end of the wheel hub adjacent to the planet carrier.

[0012] A further improvement of the present invention is that: the first skeleton oil seal is a double-lip structure, and the second skeleton oil seal is a single-lip structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described in detail below with reference to the embodiments given in the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention.

[0015] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional exploded structure of an embodiment.

[0016] Figure 3 yes Figure 1 Schematic diagram of the local enlarged structure.

[0017] Figure 4 It is a partial enlarged structural schematic diagram of the second embodiment of the present invention. DETAILED DESCRIPTION

[0018] Embodiment 1

[0019] The adjustable skeleton oil seal sealing structure of this embodiment is as follows Figure 1 , 2As shown in Figures 3 and 4, the small diameter end of the planet carrier 1 extends into the annular hub 11, and a positioning step is provided inside the hub 11. The radial gap between the planet carrier 1 and the hub 11 is provided with a first skeleton oil seal 5 outside and a second skeleton oil seal 7 inside. The first skeleton oil seal 5 of this embodiment is a double-lip structure, with the left lip preventing dust and the right lip sealing lubricating oil, and the second skeleton oil seal 7 is a single-lip structure.

[0020] The inner end of the second skeleton oil seal 7 is equipped with eight circumferentially evenly distributed and tightenable adjusting bolts 10 through threaded holes, and the outer end of the first skeleton oil seal 5 is equipped with eight circumferentially evenly distributed and tightenable clamping bolts 6 through threaded holes. The end of the adjusting bolt 10 abuts against the positioning step, and the first skeleton oil seal 5 is positioned by abutting the inner end against the outer end of the second skeleton oil seal 7.

[0021] Every two adjusting bolts 10 form a group, and after tightening, they are pressed on the adjusting gasket group 8 composed of arc-shaped gaskets 8.1, 8.2, 8.3, 8.4, and 8.5 and the arc-shaped adjusting pressure plate 9, so that after tightening, the adjusting bolts 10 are in a tightened state to eliminate the thread gap. Every two clamping bolts 6, after tightening, are pressed on the compression gasket group 4 composed of arc-shaped gaskets 4.1, 4.2, 4.3, 4.4, and 4.5 and the arc-shaped compression pressure plate 3 to form a tightenable structure. The compression pressure plate 3 is provided with a circular bolt head countersunk hole. A removable annular baffle 2 is fixedly installed in one end of the hub 11 adjacent to the planetary carrier 1, which can block mud, sand, and water pollution, and assist in the axial limit of the skeleton oil seal.

[0022] When the planetary carrier is worn and grooves appear and need to be repaired, the clamping bolts and the adjusting bolts can be removed one by one respectively, and several pieces of the clamping gasket group can be taken out as appropriate and added to the adjusting gasket group; or several pieces of the adjusting gasket group can be taken out and added to the clamping gasket group, thereby changing the contact position of the first skeleton oil seal lip and the second skeleton oil seal lip with the planetary carrier, so that the planetary carrier can still be reliably sealed and continue to be used.

[0023] Experiments have shown that after adopting this embodiment, without adding or replacing parts, the planetary carrier can be used normally for a long time by adjusting the extended length of the limit bolts and locking them tightly with the help of an appropriate number of gaskets, thereby significantly improving the convenience and economy of repair and maintenance of the wheel-side reducer.

[0024] Embodiment 2

[0025] The adjustable skeleton oil seal sealing structure of this embodiment is as follows Figure 4As shown, the basic structure is the same as that of the first embodiment, except that the threaded holes of the first skeleton oil seal 5 and the second skeleton oil seal 7 are through holes with the same thread structure in corresponding positions, the adjusting bolt 10 is composed of a large diameter section 10-2 and a small diameter section 10-1 with opposite thread directions, and the clamping bolt 6 is in a tubular shape with internal and external threads, and its internal thread matches the small diameter section. The outer end of the clamping bolt 6 and the large diameter section 10-2 and the small diameter section 10-1 of the adjusting bolt 10 are respectively provided with respective tightening nuts 12, thereby forming a tightenable structure of the clamping bolt 6 and the adjusting bolt 10.

[0026] When the contact positions of the oil seal lips of the first skeleton oil seal 5 and the second skeleton oil seal 7 with the planet carrier 1 need to be changed, there are two ways: same-direction adjustment and reverse adjustment.

[0027] Same direction adjustment - that is, the first skeleton oil seal 5 and the second skeleton oil seal 7 are displaced in the same direction relative to the planet carrier 1. At this time, loosen the clamping bolt 6 and the tightening nut of the large diameter section 10-2 of the adjusting bolt 10, screw in the clamping bolt 6, and its inner end fits with the end surface of the large diameter section 10-2 ( Figure 4 As shown in the figure, the adjusting bolts 10 with the same thread structure in the large diameter section rotate synchronously. Since the end of the adjusting bolt 10 abuts against the positioning step and cannot be axially displaced in the screwing direction of the screw-in clamping bolt 6, under the action of the spiral pair, the first skeleton oil seal 5 and the second skeleton oil seal 7 will be axially displaced in the same direction opposite to the screwing-in clamping bolt 6, and the distance between the two skeleton oil seals remains unchanged. After adjustment, tighten the nut.

[0028] Reverse adjustment - that is, the first skeleton oil seal 5 and the second skeleton oil seal 7 are displaced in different directions relative to the planetary carrier 1. At this time, the small diameter section 10-1 of the adjusting bolt 10 and the tightening nut of the large diameter section 10-2 are loosened, and the hexagonal hole at the end of the small diameter section is still screwed in the direction of screwing in the clamping bolt 6 as mentioned above. Because it is coaxial with the large diameter section 10-2, the large diameter section of the adjusting bolt 10 will rotate together. Since the end of the adjusting bolt 10 abuts against the positioning step and cannot be axially displaced, under the action of the spiral pair, the second skeleton oil seal 7 will be axially displaced in the direction close to the first skeleton oil seal 5; at the same time, under the action of the reverse spiral pair of the small diameter section 10-1 and the inner hole of the clamping bolt 6, the clamping bolt 6 will be displaced in the direction close to the second skeleton oil seal 7, and the clamping bolt 6 is fixedly connected to the first skeleton oil seal 5 due to the action of its tightening nut, thereby realizing the displacement of the first skeleton oil seal 5 and the second skeleton oil seal 7 in different directions close to each other, and the distance between the two skeleton oil seals is changed. After adjustment, tighten the tightening nut.

[0029] By adopting this embodiment, there is no need to add or replace parts. The relative position of the skeleton oil seal and the planetary carrier can be changed completely by adjusting the bolts, so that the planetary carrier can be used normally for a long time, and the number of parts is small. The two skeleton oil seals can be shifted in the same direction by adjusting the same threaded part of the clamping bolt and the adjusting bolt, and can also be shifted in the opposite direction by adjusting the reverse threaded part of the clamping bolt and the adjusting bolt. Therefore, it can be selected as appropriate, which is more flexible.

[0030] In addition to the above embodiments, the present invention may also have other implementations. For example, the tightening structure may also be a bolt or spring washer with a self-locking function. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. An adjustable skeleton oil seal sealing structure suitable for the output end of a wheel-side reducer, comprising a small-diameter end extending into an annular wheel hub and a planet carrier, the wheel hub having a positioning step, a first skeleton oil seal outside and a second skeleton oil seal inside the radial gap between the planet carrier and the wheel hub, characterized in that : The inner end of the second skeleton oil seal is equipped with a tightenable adjusting bolt through a threaded hole, and the outer end of the first skeleton oil seal is equipped with a tightening bolt, the end of the adjusting bolt abuts against the positioning step, and the first skeleton oil seal is positioned by the second skeleton oil seal; the threaded holes of the first skeleton oil seal and the second skeleton oil seal are through-holes with the same threaded structure corresponding to the position, the adjusting bolt is composed of a large diameter section and a small diameter section with opposite thread rotation directions, and the tightening bolt is in a tubular shape with internal and external threads, and the internal threads match the external threads of the small diameter section; the outer end of the tightening bolt and the large diameter section and small diameter section of the adjusting bolt are respectively provided with corresponding tightening nuts, thereby forming a tightenable structure of the tightening bolt and the adjusting bolt, respectively.

2. The adjustable skeleton oil seal sealing structure suitable for the output end of the wheel reducer according to claim 1 is characterized in that A removable annular baffle is fixedly installed in one end of the hub adjacent to the planetary frame.

3. The adjustable skeleton oil seal sealing structure suitable for the output end of the wheel reducer according to claim 1 is characterized in that The first skeleton oil seal has a double lip structure, and the second skeleton oil seal has a single lip structure.

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