CN109094600B - A kind of journal box spring is pre-assembled to be set - Google Patents
A kind of journal box spring is pre-assembled to be set Download PDFInfo
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- CN109094600B CN109094600B CN201810826895.2A CN201810826895A CN109094600B CN 109094600 B CN109094600 B CN 109094600B CN 201810826895 A CN201810826895 A CN 201810826895A CN 109094600 B CN109094600 B CN 109094600B
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- guide post
- spring
- journal box
- hole
- assembled
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
- B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
- B61F5/305—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating rubber springs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61F—RAIL VEHICLE SUSPENSIONS, e.g. UNDERFRAMES, BOGIES OR ARRANGEMENTS OF WHEEL AXLES; RAIL VEHICLES FOR USE ON TRACKS OF DIFFERENT WIDTH; PREVENTING DERAILING OF RAIL VEHICLES; WHEEL GUARDS, OBSTRUCTION REMOVERS OR THE LIKE FOR RAIL VEHICLES
- B61F5/00—Constructional details of bogies; Connections between bogies and vehicle underframes; Arrangements or devices for adjusting or allowing self-adjustment of wheel axles or bogies when rounding curves
- B61F5/26—Mounting or securing axle-boxes in vehicle or bogie underframes
- B61F5/30—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes
- B61F5/301—Axle-boxes mounted for movement under spring control in vehicle or bogie underframes incorporating metal springs
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Springs (AREA)
Abstract
The present invention relates to journal box springs to assemble field, discloses that a kind of journal box spring is pre-assembled to be set, including top board, lower platen, guide post, briquetting and sleeve；Be circumferentially with and the one-to-one threaded hole of the connecting hole of guide post plate of lower platen, the lower end of guide post are equipped with external screw thread and connect one to one with threaded hole, and guide post passes through connecting hole and realizes that guide post plate is mounted on lower platen；Top board is circumferentially with the through-hole for corresponding and passing through for the guide post, top board is equipped with matched first centre bore of guide post for one being rubber spring, briquetting is in the guide post inner hole of rubber spring for being placed on one, apply downward pressure to journal box spring by briquetting, journal box spring is compressed, be set in the guide post above top board after being compressed to setting height by sleeve and is locked by locking member.The present invention can satisfy phase requirements when journal box spring press fitting, while protecting one is the rubber part of rubber spring, avoids its stress.
Description
Technical field
The present invention relates to journal box spring package technique fields, set more particularly to a kind of journal box spring is pre-assembled.
Background technique
Common journal box spring is without phase requirements, mainly by steel spring inside and outside one group, upper lower clamp plate composition.It is common in press fitting
When journal box spring, it need to only exert a force to upper lower clamp plate, after journal box spring is compressed to specified altitude, mounting process bolt, then
Complete the press fitting of journal box spring.
The journal box spring of EMU, mainly by a steel spring and one be rubber spring, spring upper clamp plate and guide post board group at,
One is that there are stringent phase requirements between rubber spring and spring upper clamp plate, and cannot be to the rubber of rubber spring in press fitting
Glue part applies too big pressure, journal box spring point of the structure or so part, the structure mirror symmetry of left and right part.Existing axle box bullet
Spring organizes tooling in advance and has been unable to meet press fitting requirement.
Summary of the invention
(1) technical problems to be solved
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
It sets the object of the present invention is to provide a kind of journal box spring is pre-assembled, phase when can satisfy journal box spring press fitting is wanted
It asks, the rubber part stress that can also be rubber spring to avoid one.
(2) technical solution
It sets in order to solve the above technical problem, the present invention provides a kind of journal box spring is pre-assembled, the journal box spring includes
Guide post plate, spring upper clamp plate, one are rubber spring and steel spring, and the circumferentially-spaced of the guide post plate is equipped with multiple connecting holes, institute
That states guide post plate is axially arranged with upper guide post and lower guide post, and the journal box spring is pre-assembled to be set including top board, lower platen, guiding
Column, briquetting and sleeve；Be circumferentially with and the one-to-one threaded hole of the connecting hole of the lower platen, the guide post
Lower end is equipped with external screw thread and connects one to one with the threaded hole, and the guide post passes through the connecting hole and realizes the guide post
Plate is mounted on the lower platen, and the lower guide post of the spring upper clamp plate and the guide post plate is interference fitted, and the steel spring is arranged
On the spring upper clamp plate, described one is that rubber spring is cooperatively connected with the spring upper clamp plate and abuts with the steel spring；
The top board is circumferentially with the through-hole for corresponding and passing through for the guide post, and it is rubber that the top board, which is equipped with described one,
Matched first centre bore of the guide post of glue spring, the briquetting for be placed on described one be in the guide post inner hole of rubber spring simultaneously
Apply downward pressure to compress the journal box spring, be set in after being compressed to setting height by the sleeve described
It is locked in the guide post above top board and by locking member.
Wherein, the distribution on the lower platen positioned at multiple connecting holes is circumferentially additionally provided with a lower pilot hole, described
Lower pilot hole and connecting hole described in one of them are close, for adapting to two kinds of journal box springs of left and right mirror symmetry setting simultaneously.
Wherein, the lower platen is equipped with the second centre bore passed through for the lower guide post of the guide post plate, the lower platen
Bottom surface, which is located at outside second centre bore, is additionally provided with cylinder.
Wherein, the distribution on the top board positioned at multiple through-holes is circumferentially additionally provided with a upper pilot hole, it is described on
Pilot hole and through-hole described in one of them are close, for adapting to two kinds of journal box springs of left and right mirror symmetry setting.
Wherein, described one is that the guide post outer peripheral surface of rubber spring is equipped with outerplanar, and the inner peripheral surface of first centre bore sets
There is the inner plane to match with the outerplanar.
Wherein, the upper end of the guide post also is provided with external screw thread, the locking member be equipped with in external screw thread cooperation
Threaded hole.
Wherein, the internal diameter of the sleeve and the outer diameter of the guide post match.
Wherein, described one be rubber spring guide post inner hole be threaded hole, screwed on after being removed for the briquetting and its
The service bolt being threadedly engaged；After locking journal box spring, briquetting is removed, is the guide post of rubber spring by service bolt connection one
With spring upper clamp plate, realizes the locking of axle spring, then remove sleeve, pre- group for completing journal box spring.
Wherein, pressure is applied to the briquetting by press ram.
Wherein, the bottom surface of the briquetting be axially arranged with for be inserted into described one be the guide post inner hole of rubber spring convex
It rises.
(3) beneficial effect
Compared with prior art, the invention has the following advantages that
A kind of journal box spring provided by the invention is pre-assembled to be set, including top board, lower platen, guide post, briquetting and set
Cylinder；It is used to fix the guide post plate of journal box spring by lower platen, guarantees the phase of guide post plate, top board can guarantee that one is rubber
The phase of spring is fixed the relative position of top board and lower platen by guide post；It is rubber spring to one by briquetting
Guide post applies pressure, and avoiding one is the rubber part stress of rubber spring, realizes the compression of journal box spring, and journal box spring is compressed to
Behind position, journal box spring, pre- group for completing journal box spring are lockked by sleeve, locking member.The present invention can satisfy press fitting axle box bullet
Phase requirements when spring.
The present invention increases a upper pilot hole on top board, makes by increasing a lower pilot hole on lower platen
Used time by the position of a piece guide post of change, just can be suitable for the left and right journal box spring of mirror symmetry simultaneously.
Detailed description of the invention
Fig. 1 is the axial schematic cross-sectional view of existing journal box spring；
Fig. 2 is the schematic front view of guide post plate；
Fig. 3 is the A-A cross-sectional view of Fig. 1；
Fig. 4 is the pre-assembled schematic front view for setting middle lower platen of journal box spring of the present invention；
Fig. 5 is the axial sectional view of Fig. 4；
Fig. 6 is the pre-assembled schematic front view for setting middle top board of journal box spring of the present invention；
Fig. 7 is the pre-assembled assembling process schematic diagram set of journal box spring of the present invention；
Fig. 8 is that pre-assembled set of journal box spring of the present invention applies stressed structural schematic diagram；
Fig. 9 is the pre-assembled structural schematic diagram set after the completion of pre- group of journal box spring of the present invention；
In figure: 1: guide post plate；11: connecting hole；12: upper guide post；13: lower guide post；2: spring upper clamp plate；Be rubber bullet at 3: one
Spring；31: guide post；32: outerplanar；33: vulcanized rubber；34: mandrel；4: steel spring；5: lower platen；51: threaded hole；52: lower guiding
Hole；53: cylinder；54: the second centre bores；6: top board；61: through-hole；62: upper pilot hole；63: the first centre bores；64: interior flat
Face；7: guide post；8: sleeve；9: briquetting；10: locking member；100: service bolt；200: press ram.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
In the description of the present invention, it should be noted that term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second ", " third " etc. are used for description purposes only, and should not be understood as instruction or
Imply relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, concrete condition can be regarded and understand that above-mentioned term exists
Concrete meaning in the present invention.
In addition, in the description of the present invention, unless otherwise indicated, " multiple ", " more ", " multiple groups " be meant that two or
It is more than two.
As shown in Figure 1-3, it is rubber spring 3 and steel spring that the journal box spring, which includes guide post plate 1, spring upper clamp plate 2, one,
4, the circumferentially-spaced of the guide post plate 1 is equipped with multiple connecting holes 11, and the guide post plate 1 is axially arranged with upper guide post 12 and lower guide post
13.Before guide post plate 1 is installed, first the lower guide post 13 of the spring upper clamp plate 2 and the guide post plate 1 is interference fitted and is connected,
Pass through the position of 1 fixed spring upper clamp plate 2 of guide post plate.One be 34 periphery of mandrel of rubber spring 3 is vulcanized rubber 33, is being carried out
Journal box spring cannot impose severe pressure to vulcanized rubber 33 when compressing.In addition, journal box spring divides tiled configuration, tiled configuration
Mirror symmetry.
As shown in figures 4-9, it sets the embodiment of the invention provides a kind of journal box spring is pre-assembled, the journal box spring is pre-assembled
It sets including top board 6, lower platen 5, guide post 7, briquetting 9 and sleeve 8；The lower platen 5 is circumferentially with and the connection
The one-to-one threaded hole 51 in hole 11, the lower end of the guide post 7, which is equipped with external screw thread and corresponds with the threaded hole 51, to be connected
It connects, so that guide post 7 is fixed on lower platen 5, the guide post 7 passes through the connecting hole 11 and realizes that the guide post plate 1 is pacified
On the lower platen 5, to guarantee the phase of the guide post plate 1, the steel spring 4 is set on the spring upper clamp plate 2, institute
State one be rubber spring 3 mandrel 34 be inserted into the axial bore of the spring upper clamp plate 2 and both realize and to be cooperatively connected, and one
It is that the inner face of rubber spring 3 is abutted with the steel spring 4；The one-to-one correspondence that is circumferentially with of the top board 6 supplies the guide post 7
The through-hole 61 passed through, the top board 6 be equipped with described one be rubber spring 3 matched first centre bore 63 of guide post 31, on
Pressing plate 6 passes through position positioning after guide post 7, and one is that rubber spring 3 with the first centre bore 63 matches connection, thus one system of guarantee
The phase of rubber spring 3；As shown in fig. 7, the briquetting 9 for be placed on described one be in the guide post inner hole of rubber spring 3 simultaneously
Apply downward pressure to compress the journal box spring, guide post 31 transfers the pressure on steel spring 4, avoids sulphur in this way
Change rubber 33 and bear biggish pressure, 6 top of top board is set in by the sleeve 8 after being compressed to setting height
It is locked in the guide post 7 and by locking member 10, by the decrement lock of journal box spring in required height, realizes and lock axle box
Then spring removes the briquetting 9, lock journal box spring by the service bolt 100, then remove 10 He of locking member
The sleeve 8 completes pre- group of journal box spring.
In the embodiment of the present invention, as illustrated in figures 4-5, the distribution of multiple connecting holes 11 is located on the lower platen 5
It circumferentially is additionally provided with a lower pilot hole 52, the lower pilot hole 52 and connecting hole 11 described in one of them are close, are used for while suitable
Should left and right mirror symmetry setting two kinds of journal box springs.By increasing a lower pilot hole 52, to pass through change when in use
The position of a piece guide post 7, so that it may which pre- group is carried out to two kinds of left and right journal box spring.
In the embodiment of the present invention, the lower platen 5 is equipped with the second centre bore 54 passed through for the lower guide post 13, described
The bottom surface of lower platen 5, which is located at outside second centre bore 54, is additionally provided with cylinder 53, to avoid 13 stress of lower guide post of guide post plate 1.
In the embodiment of the present invention, as shown in fig. 6, circumferential positioned at the distribution of multiple through-holes 61 on the top board 6
It is additionally provided with a upper pilot hole 62, the upper pilot hole 62 and through-hole 61 described in one of them are close, for adapting to left and right mirror image
Symmetrically arranged two kinds of journal box springs.Similarly with lower platen 5, top board 6 is by increasing a upper pilot hole 62, thus making
The position that used time passes through a piece guide post 7 of change, so that it may which pre- group is carried out to two kinds of left and right journal box springs.
In the embodiment of the present invention, as shown in figure 3, described one be rubber spring 3 guide post outer peripheral surface be equipped with outerplanar 32,
As described in Figure 6, the inner peripheral surface of first centre bore 63 is equipped with the inner plane 64 to match with the outerplanar 32, to install
One when being rubber spring 3, only a kind of mounting means that docks with outerplanar 32 of inner plane 64, to more easily determine one
It is the phase of rubber spring 3.
In the embodiment of the present invention, as shown in figure 9, the upper end of the guide post 7 also is provided with external screw thread, the locking member 10
Equipped with the internal thread hole cooperated with the external screw thread, locking member can led for nut when journal box spring is compressed to setting value
Upper bush 8 is covered on column 7 and screws on nut, can realize locking.
Specifically, the internal diameter of the sleeve 8 and the outer diameter of the guide post 7 match, and the length of sleeve 8 needs to meet
Use demand, when nut is screwed on the upper external screw thread of guide post 7, nut is abutted with sleeve 8.
As shown in figure 9, described one be rubber spring 3 guide post inner hole be threaded hole, screwed on after being removed for the briquetting 9
The service bolt 100 being threadedly engaged with it, to complete pre- group of journal box spring.
For the ease of applying pressure, as shown in figure 8, applying downward pressure to the briquetting 9 by press ram 200
Power, in figure arrow direction be one be rubber spring 3 Impact direction.In addition, pressure when in order to guarantee to apply pressure to briquetting 9
Block 9 is not in offset, the bottom surface of the briquetting 9 be axially arranged with for be inserted into described one be rubber spring guide post inner hole determine
Position protrusion, by the positioning protrusion and guide post inner hole, plays positioning action to briquetting 9.
The specific pre- group of process of the embodiment of the present invention are as follows: the component after being first pressed guide post plate 1 with spring upper clamp plate 2 is put
On lower platen 5, realizing one is the phase requirements between rubber spring 3 and guide post plate 1, passes through more preferably three guide posts
7 fix the component；
It is that rubber spring 3 is placed in spring upper clamp plate 2 by one, one is in the mandrel 34 and spring upper clamp plate 2 of rubber spring 3
Hole cooperation, three guide posts 7 pass through the pilot hole of top board 6, and top board 6 is that the upper surface of rubber spring 3 is bonded with one, a system
The guide post of rubber spring 3 passes through the first centre bore 63 of top board 6.Then briquetting 9 is placed on one is in the guide post of rubber spring 3
Kong Zhong applies the compression that pressure carries out journal box spring to briquetting 9.In compression process, press ram 200 can be simultaneously to briquetting
9 and one be that 3 guide post of rubber spring applies pressure, and it is to avoid on 3 mandrel 34 of rubber spring that pressure is transmitted to steel spring 4 and one simultaneously
Vulcanized rubber 33 is by larger pressure；After journal box spring is compressed to specified altitude, by three 8 sets of sleeve in three guide posts 7,
Then nut is tightened in guide post 7, to lock journal box spring, then takes away briquetting 9, mounting process bolt 100 is final to realize
Pre- group of journal box spring.
As can be seen from the above embodiments, the present invention can satisfy the phase requirements of journal box spring, and can be avoided one
It is the larger pressure of 33 part of vulcanized rubber receiving of rubber spring 3.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
- Set 1. a kind of journal box spring is pre-assembled, the journal box spring include guide post plate, spring upper clamp plate, one be rubber spring and Steel spring, the circumferentially-spaced of the guide post plate are equipped with multiple connecting holes, and the guide post plate is axially arranged with upper guide post and lower guide post, It is characterized in that, the journal box spring is pre-assembled to be set including top board, lower platen, guide post, briquetting and sleeve；The lower platen Be circumferentially with the one-to-one threaded hole of the connecting hole, the lower end of the guide post be equipped with external screw thread and with the screw thread Hole connects one to one, and the guide post passes through the connecting hole and realizes that the guide post plate is mounted on the lower platen, described The lower guide post of spring upper clamp plate and the guide post plate is interference fitted, and the steel spring is set on the spring upper clamp plate, and described one It is that rubber spring is cooperatively connected with the spring upper clamp plate and abuts with the steel spring；The top board is circumferentially with an a pair The through-hole that should be passed through for the guide post, the top board is equipped with matched first center of guide post for described one being rubber spring Hole, the briquetting are in the guide post inner hole of rubber spring and to apply downward pressure to the axle box bullet for being placed on described one Spring is compressed, and is set in the guide post above the top board simultaneously after being compressed to setting height by the sleeve It is locked by locking member.
- It is set 2. journal box spring according to claim 1 is pre-assembled, which is characterized in that be located on the lower platen multiple described The distribution of connecting hole is circumferentially additionally provided with a lower pilot hole, and the lower pilot hole and connecting hole described in one of them are close, is used for Two kinds of journal box springs of left and right mirror symmetry setting are adapted to simultaneously.
- It is set 3. journal box spring according to claim 1 is pre-assembled, which is characterized in that the lower platen, which is equipped with, supplies the guide post The second centre bore that the lower guide post of plate passes through, the bottom surface of the lower platen, which is located at outside second centre bore, is additionally provided with cylinder.
- It is set 4. journal box spring according to claim 1 is pre-assembled, which is characterized in that be located on the top board multiple described The distribution of through-hole is circumferentially additionally provided with a upper pilot hole, and the upper pilot hole and through-hole described in one of them are close, for adapting to Two kinds of journal box springs of left and right mirror symmetry setting.
- It is set 5. journal box spring according to claim 1 is pre-assembled, which is characterized in that described one is outside the guide post of rubber spring Circumferential surface is equipped with outerplanar, and the inner peripheral surface of first centre bore is equipped with the inner plane to match with the outerplanar.
- It is set 6. journal box spring according to claim 1 is pre-assembled, which is characterized in that the upper end of the guide post also is provided with outer Screw thread, the locking member are equipped with the internal thread hole cooperated with the external screw thread.
- It is set 7. journal box spring according to claim 1 is pre-assembled, which is characterized in that the internal diameter of the sleeve and the guiding The outer diameter of column matches.
- It is set 8. journal box spring according to claim 1 is pre-assembled, which is characterized in that described one is in the guide post of rubber spring Hole is threaded hole, and the service bolt being threadedly engaged with it is screwed on after removing for the briquetting.
- It is set 9. journal box spring according to claim 1 is pre-assembled, which is characterized in that by press ram to the briquetting Apply pressure.
- It is set 10. journal box spring according to claim 1 is pre-assembled, which is characterized in that the bottom surface of the briquetting is axially arranged with For be inserted into described one be the guide post inner hole of rubber spring positioning protrusion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810826895.2A CN109094600B (en) | 2018-07-25 | 2018-07-25 | A kind of journal box spring is pre-assembled to be set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810826895.2A CN109094600B (en) | 2018-07-25 | 2018-07-25 | A kind of journal box spring is pre-assembled to be set |
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| Publication Number | Publication Date |
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| CN109094600A CN109094600A (en) | 2018-12-28 |
| CN109094600B true CN109094600B (en) | 2019-11-08 |
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| CN201810826895.2A Active CN109094600B (en) | 2018-07-25 | 2018-07-25 | A kind of journal box spring is pre-assembled to be set |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110102998A (en) * | 2019-05-30 | 2019-08-09 | 中车广东轨道交通车辆有限公司 | A kind of EMU journal box spring assembling device |
| CN110284899A (en) * | 2019-07-24 | 2019-09-27 | 天津宏轩达科技有限公司 | A kind of flexible cutterhead of complete-section tunnel boring machine |
| CN110509230A (en) * | 2019-08-15 | 2019-11-29 | 成都中车四方轨道车辆有限公司 | A kind of journal box spring group pre-compression device |
| CN110562283A (en) * | 2019-10-21 | 2019-12-13 | 江苏凯宫隧道机械有限公司 | Spring assembly for bearing bogie of muck truck and assembling and disassembling method thereof |
| CN111069894A (en) * | 2019-11-29 | 2020-04-28 | 中车青岛四方机车车辆股份有限公司 | Variable-gauge wheel set axle box assembling method and assembling tool |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6148734A (en) * | 1998-05-19 | 2000-11-21 | Lord Corporation | Elastomeric bearing with softening spring rate |
| CN102673596A (en) * | 2011-03-10 | 2012-09-19 | 南车青岛四方机车车辆股份有限公司 | Composite axle box positioning device and processing and assembling method thereof |
| CN104163180B (en) * | 2014-06-26 | 2017-01-18 | 中车长江车辆有限公司 | Rail wagon bogie single-stage shaft housing hanging and positioning device |
| FR3051721B1 (en) * | 2016-05-26 | 2018-06-29 | Peugeot Citroen Automobiles Sa | METHOD FOR ASSEMBLING A SUSPENSION SYSTEM FOR A MOTOR VEHICLE |
| CN106122330B (en) * | 2016-07-11 | 2018-11-13 | 株洲时代新材料科技股份有限公司 | Adjust a method and products thereof for being rubber spring rigidity and radial precompressed amount |
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