CN105904406A - Precision press fitting device for spinning bushes at high strength - Google Patents
Precision press fitting device for spinning bushes at high strength Download PDFInfo
- Publication number
- CN105904406A CN105904406A CN201610506412.1A CN201610506412A CN105904406A CN 105904406 A CN105904406 A CN 105904406A CN 201610506412 A CN201610506412 A CN 201610506412A CN 105904406 A CN105904406 A CN 105904406A
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- CN
- China
- Prior art keywords
- lining
- hole
- pin
- rod
- nylon rod
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for
- B23P11/02—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits
- B23P11/025—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for by first expanding and then shrinking or vice versa, e.g. by using pressure fluids; by making force fits by using heat or cold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
- B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automatic Assembly (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention discloses a precision press fitting device for spinning bushes at high strength and a press fitting method. The precision press fitting device comprises a nylon rod and a press fitting table; the nylon rod comprises a handheld end, a bush sleeve and a limiting column, wherein the handheld end, the bush sleeve and the limiting column are coaxial, a connection screw, a spring and a dowel are arranged inside a through hole of the bush sleeve, and key grooves are formed in the outer wall of the limiting column; the press fitting table comprises a base, a locating ring and a supporting base, wherein the locating ring and the supporting base are fixed to the two ends of the base respectively, and guide pins are arranged on the inner wall of the supporting base; when a large end hole of a connecting rod to be pressed is arranged on the locating ring in a sleeving mode, a small end hole of the connecting rod to be pressed is located above the supporting base and the central axis of the large end hole and the central axis of the small end hole overlap, the central angle of the guide pins and the projection of an oil hole in the small end hole on one circle is equal to the central angle of the key grooves in the nylon rod and the projection of the through hole on one circle. According to the precision press fitting device, through the modular design, the connecting rod bushes can be manually assembled accurately without pressure, the assembly requirements of the bushes of existing various connecting rods can be met, the operation is convenient, simple and fast, and good social benefits and economic benefits are obtained.
Description
Technical field
The invention belongs to diesel engine connecting bar lining mounting technology field, relate to a kind of high intensity spinning lining precision and press-fit dress
Put.
Background technology
High-speed diesel engine small end of connecting rod end structure is connecting rob bushing and little stomidium elastic conjunction (magnitude of interference 0.067-
0.106mm), small end of connecting rod oilhole aligns through with connecting rob bushing upper oil hole, and in work, lining to bear and the biggest to break out pressure
And alternating download load forces.Connecting rob bushing and the assembling process of connecting rod are extremely important to the performance of whole electromotor and normal operation
Link, the quality of assembling quality, directly affect the normal work of electromotor.Matching requirements connecting rob bushing oilhole and small end of connecting rod
Oilhole aligns, it is ensured that having the lubricating oil of abundance to enter, lining can not protrude wrist-pin end of connecting rod, and lining and tie rod holes have reliable and stable
Fixing power, lining will not relatively rotate with little head bore in working order.Generally connecting rob bushing is adopted with connecting rod small end hole assembling
Use liquid nitrogen cooling bushing, lining is contained on principal axis of pressing machine, adjust bushing oil hole angle, then with forcing press by lining pressure
Enter connecting rod small end hole.Bar linkage structure is as shown in Figure 1.
Then generally lining assembling uses lining cooling by the method for forcing press assembling, owing to assembling is applied with bigger pressure
Power, even if even if causing the sleeve outer surface when assembling to have slight foreign material or burr, lining just putting, all can be at bigger pressure
Effect under load tie rod holes, but be so likely to result in sleeve outer surface scratch, scratch phenomenon, cause the assembling magnitude of interference not
Foot, fixing power reduces, but owing to having been charged in connecting rod, it is impossible to finding, there is great hidden danger of quality, the high speed at electromotor is transported
During Zhuaning, if the magnitude of interference is not enough, lining can produce rotation in tie rod holes, makes oilhole block, and causes for shortage of oil, starts
The serious consequences such as machine burning car, connecting rod cracking, lining come off from tie rod holes, damage whole electromotor.
Summary of the invention
(1) goal of the invention
It is an object of the invention to: use and manual carries out connecting rob bushing assembling without press-fiting the method joined, by grope lining and
The harmomegathus rule of connecting rod small end hole, designs press-loading apparatus accurate, reliable, it is achieved carry out connecting rob bushing joining without press-fiting, it is ensured that
Matching requirements, it is to avoid sleeve outer surface scratch occurs during assembling, scratches phenomenon, improve the fixing power of lining and connecting rod small end hole,
Eliminate hidden danger of quality, improve the reliability of high-speed diesel engine.
(2) technical scheme
In order to solve above-mentioned technical problem, the present invention provides a kind of high intensity spinning lining precision press-loading apparatus, comprising:
Nylon rod and pressing platform；
Nylon rod from top to bottom includes coaxial handheld terminal 1, bushing sleeves 6 and limited post 7, the height of described bushing sleeves 6
Degree equal to the internal diameter of lining, bushing sleeves 6 is radially provided with through hole equal to the height of lining, the external diameter of bushing sleeves 6
8, through hole 8 is internal, and attachment screw 4 is fixed in one end, and middle part arranges the spring 3 being connected with attachment screw 4, and the other end is arranged and spring
3 pins 2 connected, when spring 3 is in free state, it is outside that pin 2 highlights through hole 8, and when spring 3 is compressed, pin 2 is retracted logical
Hole 8 is internal；Two symmetrical keyways 9 are in axial direction offered on limited post 8 outer wall；
Pressing platform includes base 10 and the centring ring 12 being fixed on base 10 two ends, supports seat 11, in described centring ring 12
The heart and the distance supported between seat 11 center are equal to the distance between crank bore center to be press-fited and little stomidium center, described
The external diameter of centring ring 12 is equal to the internal diameter of crank bore, and described support seat 11 is circular cylinder, and its internal diameter is equal to limited post 7
External diameter, its height, not less than the height of limited post 7, its inwall in axial direction offers two symmetrical guide fingers 14；
Crank bore to be press-fited is enclosed within centring ring 2, and little stomidium is positioned at above support seat 11 and both central axis weights
Closing, now, the central angle that guide finger 14 and little stomidium upper oil hole are projected on same circle is equal to keyway 9 and through hole on nylon rod
8 are projected in the central angle on same circle.
Wherein, arranging baffle plate 5 between described handheld terminal 1 and bushing sleeves 6, the diameter of baffle plate 5 is straight more than bushing sleeves 6
Footpath.
Wherein, described centring ring 12 is detachably mounted on base 10 by bolt 16 and nut 17, it is achieved centring ring 2
Can move left and right on base 10.
Wherein, described support seat 11 is fixed on base 10 by multiple fixing screws.
Wherein, described support seat 11 and base 10 offering coaxial aperture, hole is inserted into alignment pin 15, it is achieved to supporting seat 11
Location.
Present invention also offers a kind of bushing press-mounting method based on the described press-loading apparatus of any of the above-described item, it includes following
Step:
S1, cooling bushing, heat wrist-pin end of connecting rod；
S2, will heating after connecting rod be placed on base 10, make centring ring 12 embed crank bore, carry out connecting rod make a reservation for
Position；
S3, by lining take out, be enclosed within nylon rod bushing sleeves, rotary liner, utilize the effect of spring 3, make pin 2 push up
At oilhole center, lining is positioned；
S4, catch nylon rod handheld terminal, make guide finger 14 enter the keyway 9 of nylon rod bottom；
S5, fine setting wrist-pin end of connecting rod hole site so that it is align with the lining being contained on nylon rod, nylon rod is imposed simultaneously to
Under power, make lining load in wrist-pin hole；
After S6, nylon rod keep the several seconds in tie rod holes, lining raises external diameter with temperature and becomes big and wrist-pin hole change
For interference fit, upwards pull out nylon rod, make pin 2 overcome spring 3 to bounce back, make nylon rod disengage with lining and extract.
Wherein, in described step S1, lining is cleaned and puts into cooling in liquid nitrogen, until liquid nitrogen stops boiling；Wrist-pin end of connecting rod
It is placed in 80-90 DEG C of water, heats 5-10 minute.
(3) beneficial effect
The high intensity spinning lining precision press-loading apparatus that technique scheme is provided, compared with prior art, passes through mould
Massing designs, and not only can meet under manual passive state, carry out connecting rob bushing assembling exactly, and can meet existing multi items
The lining assembling of connecting rod, the most convenient and simple for operation, quick, achieve extraordinary Social benefit and economic benefit.
Accompanying drawing explanation
Fig. 1 is the structural representation of diesel engine connecting bar in prior art.
Fig. 2 is the structural representation of nylon rod in embodiment of the present invention press-loading apparatus, and wherein, a figure is front view, and b figure is
Side view, c figure is the A-A direction view of a figure.
Fig. 3 is the structural representation of pressing platform in embodiment of the present invention press-loading apparatus, and wherein, a figure is front view, and b figure is
Top view.
In figure: 1-handheld terminal；2-pin；3-spring；4-attachment screw；5-baffle plate；6-bushing sleeves；7-limited post；8-
Through hole；9-keyway；10-base；11-supports seat；12-centring ring；13-fixes screw；14-guide finger；15-alignment pin；16-spiral shell
Bolt；17-nut.
Detailed description of the invention
For making the purpose of the present invention, content and advantage clearer, below in conjunction with the accompanying drawings and embodiment, the tool to the present invention
Body embodiment is described in further detail.
In diesel engine connecting bar that the present embodiment press-loading apparatus is corresponding and connecting rob bushing structure, outside small end of connecting rod cylindrical and lining
Circle has two oilholes respectively, and between oilhole, angle is 60 degree.Liquid nitrogen cooling bushing back bush internal diameter situation of change is carried out
Data analysis, determining the relative dimensions of pressing sleeve device.First conceptual design ensures that connecting rob bushing can be accurately positioned, and ensures
During assembling, bushing oil hole is convenient with connecting rod oilhole aligns accurately, it is ensured that lining does not highlight connecting rod end face, and next requires that frock is tied
Structure is simple, and easy to operate, quick, meanwhile, device answers modularity, can conveniently apply in the lining assembling of other model connecting rod.
With reference to shown in Fig. 2 and Fig. 3, the present embodiment press-loading apparatus includes nylon rod and pressing platform two parts, nylon rod and pressure
Dress platform matches, and completes the installation of connecting rob bushing.Nylon rod from top to bottom includes coaxial handheld terminal 1, bushing sleeves 6 and spacing
Post 7, the height of described bushing sleeves 6 is equal to the height of lining, and the external diameter of bushing sleeves 6 is equal to the internal diameter of lining, bushing sleeves 6
On be radially provided with through hole 8, through hole 8 is internal, and attachment screw 4 is fixed in one end, and middle part arranges the bullet being connected with attachment screw 4
Spring 3, the other end arranges the pin 2 being connected with spring 3, and when spring 3 is in free state, it is outside that pin 2 highlights through hole 8, spring 3
When being compressed, pin 2 is retracted inside through hole 8；Two symmetrical keyways 9 are in axial direction offered on limited post 8 outer wall.Press-fit
Platform includes base 10 and the centring ring 12 being fixed on base 10 two ends, supports seat 11, described centring ring 12 center and support seat 11
Distance between center is equal to the distance between crank bore center to be press-fited and little stomidium center, outside described centring ring 12
Footpath is equal to the internal diameter of crank bore, and described support seat 11 is circular cylinder, and its internal diameter is equal to the external diameter of limited post 7, and it is highly
Not less than the height of limited post 7, its inwall in axial direction offers two symmetrical guide fingers 14；Connecting rod tip to be press-fited
Borehole jack is on centring ring 2, and little stomidium is positioned at above support seat 11 and both central axes, now, and guide finger 14 and small end
The central angle that hole upper oil hole is projected on same circle is projected in the circle on same circle equal to keyway on nylon rod 9 and through hole 8
Heart angle.
On nylon rod, when lining is set on bushing sleeves 6, in order to realize that lining is accurately positioned, at handheld terminal 1
And baffle plate 5 is set between bushing sleeves 6, the diameter of baffle plate 5 is more than the diameter of bushing sleeves 6.
On pressing platform, centring ring 12 is detachably mounted on base 10 by bolt 16 and nut 17, it is achieved centring ring 2
Can move left and right on base 10, with the assembling lining demand of satisfied different centre-to-centre spacing connecting rods.
Support seat 11 to be fixed on base 10 by multiple fixing screws, and open on support seat 11 and base 10 further
If coaxial aperture, hole is inserted into alignment pin 15, it is achieved to the location supporting seat 11, it is to avoid when support seat 11 occurs position to offset, limit
Keyway 9 on the post 7 of position is difficult to be directed at guide finger 14.
In fig. 2, by controlling distance D of through hole 8 and seal face, it is ensured that wrist-pin end of connecting rod end will not be protruded during lining assembling
Face, controls lining position on nylon rod by pin 2, is led with Fig. 3 by angle, the keyway 9 of control keyway 9 with pin 2
To the fit clearance of pin 14, control bushing oil hole and align with wrist-pin end of connecting rod oilhole angle, flexible operation during assembling.
Using the press-loading apparatus of the present embodiment, specifically assembling lining operating procedure is:
1, lining is cleaned put in liquid nitrogen cool down, until liquid nitrogen stop boiling, wrist-pin end of connecting rod is placed in 80-90 DEG C of water,
Heat 5-10 minute.
2, the connecting rod after heating is placed on base 10, makes centring ring 12 enter crank bore, carry out connecting rod and make a reservation for
Position.
3, lining is taken out, be enclosed within the nylon rod of Fig. 2, rotary liner, utilize the effect of spring 3, make round end pin 2 push up
At oilhole center, lining is positioned.
4, catch nylon rod top, make guide finger 14 enter the keyway 9 of nylon rod bottom.
5, fine setting wrist-pin end of connecting rod hole site so that it is align with the lining being contained on nylon rod, nylon rod is imposed gently simultaneously
Micro-downward power, makes lining load in wrist-pin hole.
6, after nylon rod keeps the several seconds in tie rod holes, lining raises external diameter change with temperature and becomes with wrist-pin hole greatly
Interference fit, upwards pulls out nylon rod, makes pin 2 overcome spring 3 to bounce back, and makes nylon rod disengage with lining and extracts.
By technique scheme it can be seen that the invention have the characteristics that:
1, realize connecting rob bushing to join without press-fiting, it is ensured that the assembling quality of each kind connecting rod, improve assembly reliability and
Stable, the reliability of electromotor work, eliminates hidden danger of quality.
2, assembling is simple, quick, and efficiency of assembling also improves nearly 30%.
3, lining percent defective reduces about 10%, almost nil.This device is used to assemble each kind connecting rob bushing altogether
8000 more than one piece, reduce loss due to spoiled work expense about 25.6 ten thousand yuan (8000 × 320 (lining price) × 10%).
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For Yuan, on the premise of without departing from the technology of the present invention principle, it is also possible to make some improvement and deformation, these improve and deformation
Also should be regarded as protection scope of the present invention.
Claims (7)
1. a high intensity spinning lining precision press-loading apparatus, it is characterised in that including: nylon rod and pressing platform；
Nylon rod from top to bottom includes coaxial handheld terminal (1), bushing sleeves (6) and limited post (7), described bushing sleeves (6)
Height equal to the height of lining, the external diameter of bushing sleeves (6) is equal to the internal diameter of lining, and bushing sleeves radially sets on (6)
Being equipped with through hole (8), through hole (8) is internal, and attachment screw (4) is fixed in one end, and middle part arranges the spring being connected with attachment screw (4)
(3), the other end arranges the pin (2) being connected with spring (3), and when spring (3) is in free state, pin (2) highlights through hole (8)
Outside, when spring (3) is compressed, pin (2) retraction through hole (8) is internal；Two are in axial direction offered on limited post (8) outer wall
The keyway (9) of individual symmetry；
Pressing platform includes base (10) and the centring ring (12) being fixed on base (10) two ends, supports seat (11), described centring ring
(12) center and the distance supported between seat (11) center are equal between crank bore center to be press-fited and little stomidium center
Distance, the external diameter of described centring ring (12) is equal to the internal diameter of crank bore, and described support seat (11) is circular cylinder, its internal diameter
Equal to the external diameter of limited post (7), its height, not less than the height of limited post (7), its inwall in axial direction offers two
Symmetrical guide finger (140；
Crank bore to be press-fited is enclosed within centring ring (2), and little stomidium is positioned at support seat (11) top and both central axis weights
Close, now, the central angle that guide finger (14) and little stomidium upper oil hole are projected on same circle equal to keyway (9) on nylon rod with
Through hole (8) is projected in the central angle on same circle.
2. high intensity spinning lining precision press-loading apparatus as claimed in claim 1, it is characterised in that described handheld terminal (1) and
Arranging baffle plate (5) between bushing sleeves (6), the diameter of baffle plate (5) is more than the diameter of bushing sleeves (6).
3. high intensity spinning lining precision press-loading apparatus as claimed in claim 1, it is characterised in that described centring ring (12) leads to
Cross bolt (16) and nut (17) is detachably mounted on base (10), it is achieved centring ring (2) can be in the upper left and right of base (10)
Mobile.
4. high intensity spinning lining precision press-loading apparatus as claimed in claim 1, it is characterised in that described support seat (11) is led to
Cross multiple fixing screw to be fixed on base (10).
5. high intensity spinning lining precision press-loading apparatus as claimed in claim 1, it is characterised in that described support seat (11) and
Base offers coaxial aperture on (10), and hole is inserted into alignment pin (15), it is achieved to the location supporting seat (11).
6. bushing press-mounting method based on press-loading apparatus according to any one of claim 1-5, it is characterised in that include following step
Rapid:
S1, cooling bushing, heat wrist-pin end of connecting rod；
S2, will heating after connecting rod be placed on base (10), make centring ring (12) embed crank bore, carry out connecting rod make a reservation for
Position；
S3, by lining take out, be enclosed within nylon rod bushing sleeves, rotary liner, utilize the effect of spring (3), make pin (2) push up
At oilhole center, lining is positioned；
S4, catch nylon rod handheld terminal, make guide finger (14) enter the keyway (9) of nylon rod bottom；
S5, fine setting wrist-pin end of connecting rod hole site so that it is align with the lining being contained on nylon rod, nylon rod is imposed downward simultaneously
Power, makes lining load in wrist-pin hole；
After S6, nylon rod keep the several seconds in tie rod holes, lining raises external diameter change with temperature and became with wrist-pin hole greatly
It is full of cooperation, upwards pulls out nylon rod, make pin (2) overcome spring (3) to bounce back, make nylon rod disengage with lining and extract.
7. pressing method as claimed in claim 6, it is characterised in that in described step S1, lining is cleaned and puts in liquid nitrogen
Cooling, until liquid nitrogen stops boiling；Wrist-pin end of connecting rod is placed in 80-90 DEG C of water, heats 5-10 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610506412.1A CN105904406B (en) | 2016-06-30 | 2016-06-30 | Bushing press-mounting method based on high intensity spinning bushing precision press-loading apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610506412.1A CN105904406B (en) | 2016-06-30 | 2016-06-30 | Bushing press-mounting method based on high intensity spinning bushing precision press-loading apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105904406A true CN105904406A (en) | 2016-08-31 |
| CN105904406B CN105904406B (en) | 2017-12-22 |
Family
ID=56753844
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610506412.1A Active CN105904406B (en) | 2016-06-30 | 2016-06-30 | Bushing press-mounting method based on high intensity spinning bushing precision press-loading apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105904406B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106737383A (en) * | 2016-11-23 | 2017-05-31 | 沈阳黎明航空发动机(集团)有限责任公司 | The big magnitude of interference coordinates dish axle assembly method in a kind of non-dismountable rotor |
| CN109732501A (en) * | 2018-12-29 | 2019-05-10 | 哈电集团（秦皇岛）重型装备有限公司 | A kind of adapter tube cold fitting method |
| CN113878313A (en) * | 2021-11-01 | 2022-01-04 | 无锡亿臻机械有限公司 | Manufacturing method of novel connecting rod supporting structure for high-speed loom |
| CN115122072A (en) * | 2022-06-20 | 2022-09-30 | 河南柴油机重工有限责任公司 | Connecting rod bushing press-fitting device and using method |
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| CN103495956A (en) * | 2013-10-10 | 2014-01-08 | 河南柴油机重工有限责任公司 | Steel cable baffle ring press fitting tool and method for axial locating |
| CN203401425U (en) * | 2013-07-16 | 2014-01-22 | 承德苏垦银河连杆股份有限公司 | Clamp special for connecting rod bush pressing and pressing machine comprising same |
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| CN101428385A (en) * | 2007-11-06 | 2009-05-13 | 贵州红林机械有限公司 | Non-pressure sleeve pressing process |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106737383A (en) * | 2016-11-23 | 2017-05-31 | 沈阳黎明航空发动机(集团)有限责任公司 | The big magnitude of interference coordinates dish axle assembly method in a kind of non-dismountable rotor |
| CN109732501A (en) * | 2018-12-29 | 2019-05-10 | 哈电集团（秦皇岛）重型装备有限公司 | A kind of adapter tube cold fitting method |
| CN113878313A (en) * | 2021-11-01 | 2022-01-04 | 无锡亿臻机械有限公司 | Manufacturing method of novel connecting rod supporting structure for high-speed loom |
| CN113878313B (en) * | 2021-11-01 | 2024-05-17 | 无锡亿臻机械有限公司 | Manufacturing method of novel connecting rod supporting structure for high-speed loom |
| CN115122072A (en) * | 2022-06-20 | 2022-09-30 | 河南柴油机重工有限责任公司 | Connecting rod bushing press-fitting device and using method |
| CN115122072B (en) * | 2022-06-20 | 2024-03-22 | 河南柴油机重工有限责任公司 | Connecting rod bushing press-fitting device and use method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105904406B (en) | 2017-12-22 |
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