A tool and method for press-fitting a dustproof oil seal into a blind hole of a steering gear

Abstract

A tool and method for press-fitting a dustproof oil seal into a blind hole of a steering gear, wherein the tool comprises a vertically arranged pressure shaft, a connection plate is looped at the upper end of the pressure shaft, a sealing sleeve is looped and slidably matched at the lower end of the pressure shaft, and a sealing device is arranged on the lower end port of the sealing sleeve; a compression spring is looped in the middle of the pressure shaft, and the two ends of the compression spring abut against the pressure shaft and the sealing sleeve respectively, a guide device is fixed on the pressure shaft, and the guide device is located below the connection plate, and the pressure shaft and the sealing sleeve are linked with the guide device in the vertical direction; a receiving groove is opened in the lower end surface of the pressure shaft, and an exhaust channel connected to the receiving groove is arranged in the pressure shaft. The provided sealing sleeve cooperates with the pressure shaft, so that negative pressure is evacuated to the blind hole, and then the dustproof oil seal is installed in the blind hole, and the structure is simple and easy to operate; by using the present invention, the dustproof oil seal is pressed into the blind hole, which is convenient for press-fitting, not easy to produce deviation, and the dustproof oil seal does not rebound.

Description

Technical Field

[0001] The invention relates to the technical field of automobile power steering gears, and in particular to a tool and a method for press-fitting a dustproof oil seal into a blind hole of a steering gear. Background Art

[0002] In the recirculating ball steering gear structure, the dustproof oil seal plays the role of preventing foreign matter from entering the steering gear and causing corrosion to the sealing parts. In order to facilitate the detection of the leakage performance of the steering gear during the test, the dustproof oil seal is usually installed last after the steering gear has passed the test. At this time, the dustproof oil seal is assembled by blind hole press-fitting, which is easy to cause the dustproof oil seal to rebound, resulting in the problem of inadequate press-fitting, making the dustproof function ineffective. Summary of the invention

[0003] In view of the problems in the prior art, the present invention provides a tool and a method for press-fitting a dustproof oil seal into a blind hole of a steering gear.

[0004] A tool for press-fitting a dustproof oil seal into a blind hole of a steering gear, characterized in that it comprises a vertically arranged pressure shaft, a connecting plate is looped on the upper end of the pressure shaft, a sealing sleeve is looped and slidably fitted on the lower end of the pressure shaft, a sealing sleeve is sealed between the sealing sleeve and the pressure shaft, and a sealing device is provided on the lower end port of the sealing sleeve; a compression spring is looped on the middle part of the pressure shaft, the two ends of the compression spring respectively abut against the pressure shaft and the sealing sleeve, a guide device is fixed on the pressure shaft, the guide device is located below the connecting plate, the pressure shaft and the sealing sleeve are both linked to the guide device in the vertical direction; a accommodating groove is opened in the lower end surface of the pressure shaft, and an exhaust channel connected to the accommodating groove is provided in the pressure shaft.

[0005] The working principle of the present invention is as follows: the lower end of the sealing sleeve is used to cover the blind hole, the sealing device is sealed on the blind hole mouth, the blind hole and the accommodating groove form a closed space, a column is fixed in the blind hole, the column is located in the accommodating groove, a gap is formed between the column and the blind hole wall, and the dustproof oil seal needs to be pressed into the gap; after the vacuum channel is externally connected to a negative pressure pump, the sealed space is evacuated to form a negative pressure inside, and then the pressure shaft is pressed downward so that the pressure shaft presses against the dustproof oil seal and presses the dustproof oil seal into the gap between the blind hole and the column. At this time, the dustproof oil seal is sealed between the gap. Since the blind hole is in a negative pressure state, there is no air between the dustproof oil seal and the blind hole after it is pressed into the blind hole, and it does not rebound. Among them, the sealing sleeve is pressed against the blind hole by a compression spring.

[0006] Further, the guide device includes a vertical guide rod, which is distributed outside the compression spring, and the upper end of the guide rod is fixedly connected to the pressure shaft, and a fixed block is fixedly arranged on the pressure shaft at a position above the compression spring, and the guide rod is fixed to the fixed block; a slider is fixedly connected to the sealing sleeve at a position below the compression spring, and the slider is slidably connected to the guide rod, and the two ends of the compression spring are respectively abutted against the fixed block and the slider. The sealing sleeve and the pressure shaft are both slidably matched with the guide rod through the slider.

[0007] Further, a sealing ring is embedded on the pressing shaft at a position between the pressing shaft and the sealing sleeve.

[0008] Further, an annular notch is provided on the outer surface of the lower end of the pressing shaft, and a stop block is fixed on the inner side of the lower end port of the sealing sleeve, the stop block is stopped on the pressing shaft and is located in the annular notch. The annular notch forms a press-fitting head at the lower end of the pressing shaft, the press-fitting head presses against the dustproof oil seal and moves into the blind hole, and when the pressing shaft moves to the set position, it is blocked by the stop block, thereby limiting the press-fitting position of the dustproof oil seal and the moving position of the pressing shaft.

[0009] Further, one side of the connecting plate is fixedly connected to a first telescopic cylinder arranged vertically, the pressing shaft is fixedly connected to the lower side of a second telescopic cylinder arranged vertically, and a driving shaft of the second telescopic cylinder is close to the pressing shaft and arranged coaxially therewith, thereby realizing automatic operation of the pressing shaft and the sealing sleeve.

[0010] Furthermore, the sealing device includes a sealing ring, which is clamped in the lower end surface of the sealing sleeve.

[0011] A method for press-fitting a dustproof oil seal into a blind hole of a steering gear, characterized in that it comprises the following steps:

[0012] Step 1: Put the dustproof oil seal on the column set in the blind hole;

[0013] Step 2: sealing the blind hole and forming a sealed cavity in the blind hole;

[0014] Step 3: Applying negative pressure to the sealed cavity;

[0015] Step 4: Press-fit the dustproof oil seal.

[0016] Further: including the tooling, in the step 2, the sealing sleeve is covered on the blind hole and sealed with the blind hole through a sealing device, and the accommodating groove and the blind hole form the sealing cavity.

[0017] Further, in step 3, the air extraction channel is externally connected to a negative pressure pump, which reduces the air pressure in the sealed cavity after being started, and keeps the relative vacuum degree of the sealed cavity at -0.03Mpa to -0.08Mpa. The range of negative pressure in the sealed cavity is calculated according to the reduction in the volume of the space between the dustproof oil seal and the blind hole, to ensure that after the dustproof oil seal is pressed into place, the pressure between the dustproof oil seal and the blind hole is less than the atmospheric pressure.

[0018] Further: in step 4, the pressing shaft is pressed downward so that the pressing shaft presses against the dustproof oil seal and moves into the blind hole to complete the press fitting; after the press fitting is completed, the pressing shaft returns to its original position, the air pressure in the sealing chamber is restored, and the tooling is removed from the blind hole.

[0019] The beneficial effects of the present invention are as follows: the provided sealing sleeve cooperates with the pressing shaft to draw negative pressure into the blind hole, and then the dustproof oil seal is installed in the blind hole, the structure is simple, and the operation is convenient; the sealing sleeve is sealed with the blind hole by pressure and the sealing ring, and the blind hole is not easily damaged; the dustproof oil seal is press-fitted into the blind hole by the present invention, which is convenient for press-fitting, not prone to deviation, and the dustproof oil seal does not rebound. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0022] Figure 3 It is a schematic diagram of the assembly structure of the present invention and the blind hole;

[0023] Figure 4 for Figure 3 A in the middle is an enlarged view of the structure of the area.

[0024] In the figure, 1, connecting plate; 2, pressing shaft; 21, accommodating groove; 22, exhaust channel; 23, annular notch; 24, fixing block; 3, compression spring; 4, guiding device; 5, sealing sleeve; 51, sealing device; 52, sliding block; 53, limiting block; 61, first telescopic cylinder; 62, second telescopic cylinder; 63, mounting plate; 7, blind hole; 71, column; 8, dustproof oil seal. DETAILED DESCRIPTION

[0025] It should be noted that the terms such as left, center, right, top, bottom, etc. in the examples of the present invention are only relative concepts or are based on the normal use state of the product, and should not be considered as restrictive.

[0026] A tool for pressing a dustproof oil seal into a blind hole of a steering gear, combined with Figure 1 and Figure 2As shown, it includes a vertically arranged pressure shaft 2, a connecting plate 1 is looped at the upper end of the pressure shaft 2, a sealing sleeve 5 is looped and slidably matched at the lower end of the pressure shaft 2, the sealing sleeve 5 is sealed between the pressure shaft 2, and a sealing device 51 is provided on the lower end port of the sealing sleeve 5; a compression spring 3 is looped at the middle part of the pressure shaft 2, and the two ends of the compression spring 3 are respectively abutted on the pressure shaft 2 and the sealing sleeve 5, a guide device 4 is fixed on the pressure shaft 1, and the guide device 4 is located below the connecting plate 1, and the sealing sleeve 5 is linked with the guide device 4 in the vertical direction; a receiving groove 21 is opened in the lower end surface of the pressure shaft 2, and an exhaust channel 22 connected with the receiving groove 21 is provided in the pressure shaft 2.

[0027] The guide device 4 includes a vertical guide rod, which is distributed outside the compression spring 3. The upper end of the guide rod is fixedly connected to the pressure shaft 2. A fixed block 24 is fixedly provided at a position above the compression spring 3 on the pressure shaft 2. The guide rod is fixed to the fixed block 24. A slider 52 is fixedly connected to a position below the compression spring 3 on the sealing sleeve 5. The slider 52 is slidably connected to the guide rod. The two ends of the compression spring 3 abut against the fixed block 24 and the slider 52 respectively. A sealing ring is embedded in the pressure shaft 2 at a position between the pressure shaft 2 and the sealing sleeve 5. An annular notch 23 is provided on the outer surface of the lower end of the pressure shaft 2. A stop block 53 is fixedly provided on the inner side of the lower end port of the sealing sleeve 5. The stop block 53 is stopped on the pressure shaft 2 and is located in the annular notch 23. One side of the connecting plate 1 is fixedly connected to a first telescopic cylinder 61 arranged vertically, the pressing shaft 2 is located below a second telescopic cylinder 62 arranged vertically, the driving shaft of the second telescopic cylinder 62 is close to the pressing shaft 2 and is coaxially arranged therewith, the first telescopic cylinder 61 and the second telescopic cylinder 62 are both fixedly connected to a mounting plate 63; the sealing device 5 includes a sealing ring, which is clamped in the lower end face of the sealing sleeve 5.

[0028] A method for press-fitting a dustproof oil seal into a blind hole of a steering gear, combined with Figure 3 and Figure 4 As shown, the following steps are included:

[0029] Step 1: Put the dustproof oil seal 8 on the column 71 set in the blind hole 7;

[0030] Step 2: sealing the blind hole 7 to form a sealed cavity in the blind hole 7;

[0031] Step 3: Applying negative pressure to the sealed cavity;

[0032] Step 4: Press-fit the dustproof oil seal 8.

[0033] Among them, including the tooling, in the step 2, the sealing sleeve 5 is covered on the blind hole 7, and is sealed with the blind hole 7 through the sealing device 51, and the accommodating groove 21 and the blind hole 7 form the sealing cavity.

[0034] In step 3, the vacuum channel 22 is externally connected to a negative pressure pump, which reduces the air pressure in the sealed chamber after startup, and keeps the relative vacuum degree of the sealed chamber at -0.03Mpa to -0.08Mpa. The range of negative pressure in the sealed chamber is calculated according to the reduction in the volume of the space between the dustproof oil seal 8 and the blind hole 7, to ensure that after the dustproof oil seal 8 is pressed into place, the pressure between the dustproof oil seal 8 and the blind hole 7 is less than the atmospheric pressure.

[0035] In step 4, the pressing shaft 2 is pressed downward so that the pressing shaft 2 moves against the dustproof oil seal 8 into the blind hole 7 and the press-fitting is completed; after the press-fitting is completed, the pressing shaft 2 returns to its original position, the air pressure in the sealing chamber is restored, and the tooling is removed from the blind hole 7.

[0036] The working principle of the present invention is as follows: the lower end of the sealing sleeve is used to cover the blind hole, the sealing device is sealed on the blind hole mouth, the blind hole and the accommodating groove form a closed space, a column is fixed in the blind hole, the column is located in the accommodating groove, a gap is formed between the column and the blind hole wall, and the dustproof oil seal needs to be pressed into the gap; after the vacuum channel is externally connected to a negative pressure pump, the sealed space is evacuated to form a negative pressure inside, and then the pressure shaft is pressed downward so that the pressure shaft presses against the dustproof oil seal and presses the dustproof oil seal into the gap between the blind hole and the column. At this time, the dustproof oil seal is sealed between the gap. Since the blind hole is in a negative pressure state, there is no air between the dustproof oil seal and the blind hole after it is pressed into the blind hole, and it does not rebound. Among them, the sealing sleeve is pressed against the blind hole by a compression spring.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A method for press-fitting a dustproof oil seal into a blind hole of a steering gear, characterized in that: The cam is an axially traversable device for camming a plurality of sealing members, each of which is adapted to move relative to the sealing member and to move relative to the sealing member, wherein the plurality of sealing members are axially traversable and are adapted to move relative to the sealing member. A receiving groove is provided, and an exhaust passage communicating with the receiving groove is provided in the pressure shaft; one side of the connecting plate is fixedly connected to a first telescopic cylinder arranged vertically, and the pressure shaft is fixedly connected to the bottom of a second telescopic cylinder arranged vertically, and a driving shaft of the second telescopic cylinder is close to the pressure shaft and arranged coaxially therewith; wherein the guiding device comprises a vertical guide rod, and the guide rod is distributed on the outside of the compression spring, and the upper end of the guide rod is fixedly connected to the pressure shaft, and a fixed block is fixedly provided at a position above the compression spring on the pressure shaft, and the guide rod is fixed to the fixed block; a slider is fixedly connected to a position below the compression spring on the sealing sleeve, and the slider is slidably connected to the guide rod, and the two ends of the compression spring are respectively abutted against the fixed block and the slider; The following steps are also included: Step 1: Put the dustproof oil seal on the column set in the blind hole; Step 2: sealing the blind hole to form a sealed cavity in the blind hole, covering the sealing sleeve on the blind hole and sealing the blind hole with a sealing device, so that the containing groove and the blind hole form the sealed cavity; Step 3: The sealed cavity is subjected to negative pressure pumping operation. The vacuum channel is externally connected to a negative pressure pump. After the negative pressure pump is started, the air pressure in the sealed cavity is reduced and the relative vacuum degree of the sealed cavity is maintained at -0.03Mpa to -0.08Mpa; Step 4: Press-fit the dustproof oil seal.

2. A method for press-fitting a dustproof oil seal into a blind hole of a steering gear according to claim 1, characterized in that: An annular notch is provided on the outer surface of the lower end of the pressing shaft, and a limit block is fixedly provided on the inner side of the lower end port of the sealing sleeve. The limit block is stopped on the pressing shaft and is located in the annular notch.

3. A method for press-fitting a dustproof oil seal into a blind hole of a steering gear according to claim 1, characterized in that: In step 4, the pressing shaft is pressed downward so that the pressing shaft moves against the dustproof oil seal into the blind hole and the press-fitting is completed; after the press-fitting is completed, the pressing shaft returns to its original position, the air pressure in the sealing chamber is restored, and the tooling is removed from the blind hole.

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