CN104165072A - Engine - Google Patents
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- CN104165072A CN104165072A CN201310181845.0A CN201310181845A CN104165072A CN 104165072 A CN104165072 A CN 104165072A CN 201310181845 A CN201310181845 A CN 201310181845A CN 104165072 A CN104165072 A CN 104165072A
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- China
- Prior art keywords
- rocker arm
- motor
- distribution device
- push rod
- bearing
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- 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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Abstract
The invention discloses an engine. The engine comprises a cylinder head, a rocker arm bracket and an air distribution mechanism. The engine is characterized in that the cylinder head and the rocker arm bracket are in an integrated structure. According to the engine provided by the invention, the rocker arm bracket and the cylinder head are in the integrated structure, so that the structure rigidity of the engine is enhanced, the whole structure of the engine in the working process is less in heating deformation, the stress deformation of the rocker arm bracket under the effect of external force is reduced, the fitting precision of the cylinder head and the rocker arm bracket is guaranteed, the fitting precision of the whole structure of the engine is further guaranteed, and the noise of the cylinder head caused by the structure deformation in the working process of the engine is reduced.
Description
Technical field
The present invention relates to engine structure design field, particularly a kind of motor.
Background technique
Motor be a kind of can other forms of can change into another kind of can machine, normally chemical energy is changed into mechanical energy, motor had both been applicable to power generating apparatus, also can comprise the whole machine of power plant.
The function of engine valve actuating mechanism is according to the work cycle of carrying out in each cylinder of motor and the requirement of ignition order, time opening and the inlet and outlet door of closing each cylinder, make fresh charge be entered in time cylinder, waste gas is able to discharge from cylinder in time, in compression and expansion stroke, ensure the sealing of firing chamber, fresh charge is gas-air mixture for petrol engine, is pure air for diesel engine.
CG(ejector pin type distribution mechanism of the prior art) motor comprises cylinder head, rocker arm support and distribution device, and distribution device is arranged on rocker arm support, and rocker arm support and cylinder head are the separate type being bolted.
As shown in Figure 1, Fig. 1 is the distribution device of CG motor of the prior art.
Wherein, the distribution device of CG motor of the prior art comprises: cam 01; Being arranged at the first lower shake-changing arm 02 on bottom rocker shaft 011 and the second lower shake-changing arm 07, the first lower shake-changing arm 02 and the second lower shake-changing arm 07 is driven by cam 01; The protruding sphere that is connected in the first push rod 03, the first push rod 03 of the first lower shake-changing arm 02 matches with the concave spherical surface of the first lower shake-changing arm 02 and exhaust rocker arm assembly 05 respectively, drives exhaust valve 04 by exhaust rocker arm assembly 05; Be connected in the second push rod 08 of the second lower shake-changing arm 07, the protruding sphere of the second push rod 08 matches with the concave spherical surface of the second lower shake-changing arm 07 and intake rocker assembly 010 respectively, drive into valve 09 by intake rocker assembly 010, the first push rod 03 and all unsettled being obliquely installed of the second push rod 08, exhaust valve 04 and intake valve 09 are each other angle and arrange; Exhaust rocker arm assembly 05 is arranged on rocker arm support by the first upper rocker arm axle 061, and intake rocker assembly 010 is arranged on rocker arm support by the second upper rocker arm axle 062.
The working principle of the distribution device of CG motor of the prior art is specially, and please refer to Fig. 1:
Exhaust process: in the time that cam 01 is rotated counterclockwise, cam 01 lift promotes the first lower shake-changing arm 02 and rotates, thereby the first lower shake-changing arm 02 is rotated around bottom rocker shaft 011, so just promoting the first push rod 03 moves up, the first push rod 03 moves upward and just promotes exhaust rocker arm assembly 05 and rotate around the first upper rocker arm axle 061, finally making exhaust rocker arm assembly 05 promote exhaust valve 04 moves downward, at this moment exhaust valve 04 is opened, waste gas starts to discharge from firing chamber, in the time that cam 01 reaches maximum lift, exhaust valve 04 also reaches maximum lift simultaneously, cam 01 is to counterclockwise continuing rotation, the lift of cam 01 reduces thereupon, the lift of exhaust valve 04 is also along with reducing simultaneously, finally make exhaust valve 04 close, exhaust process completes.
Intake process: after exhaust valve 04 cuts out, cam 01 also needs to continue to counterclockwise rotation, when promoting the second lower shake-changing arm 07, the lift of cam 01 rotates, thereby the second lower shake-changing arm 07 is rotated around bottom rocker shaft 011, so just promoting the second push rod 08 moves up, the second push rod 08 moves upward and just promotes intake rocker assembly 010 and rotate around the first upper rocker arm axle 061, finally making intake rocker assembly 010 promote intake valve 09 moves downward, at this moment intake valve 09 is opened, and incoming mixture starts to enter firing chamber from admission line.In the time that cam 01 reaches maximum lift, intake valve 09 also reaches maximum lift simultaneously, and cam 01 is to counterclockwise continuing rotation, the lift of cam 01 reduces thereupon, the lift of intake valve 09, also along with reducing, finally makes intake valve 09 close simultaneously, and intake process completes.
CG motor of the prior art; rocker arm support and cylinder head are separate type; rigidity is lower, easily can deform when rocker arm support is stressed in the course of the work, can produce heat in engine working process simultaneously; and rocker arm support and cylinder head are unlike material; expanded by heating coefficient difference, amount of deformation difference after causing being heated, due to integrally-built deformation; the quality of fit between rocker arm support and cylinder head will reduce, and then cylinder head noise is large in the course of the work to cause motor.
In sum, how to reduce motor cylinder head noise in the course of the work, become those skilled in the art's technical problem urgently to be resolved hurrily.
Summary of the invention
The object of this invention is to provide a kind of motor, can reduce motor cylinder head noise in the course of the work.
For solving the problems of the technologies described above, the invention provides following technological scheme:
A kind of motor, comprises cylinder head, rocker arm support and distribution device, and described cylinder head and described rocker arm support are integral type structure.
Preferably, in above-mentioned motor, described rocker arm support comprises three boss that separate and set gradually, and between two adjacent described boss, forms respectively the first gap and the second gap.
Preferably, in above-mentioned motor, described distribution device comprises upper rocker arm axle, and described upper rocker arm axle is on described three described boss that separate and set gradually.
Preferably, in above-mentioned motor, the first push rod of described distribution device and the second push rod are all vertically arranged at a side of described upper rocker arm axle.
Preferably, in above-mentioned motor, the exhaust valve of described distribution device and intake valve are all vertically arranged at the opposite side of described upper rocker arm axle.
Preferably, in above-mentioned motor, the exhaust rocker arm assembly of described distribution device is arranged on the described upper rocker arm axle in described the first gap, described exhaust valve is fixedly connected with described exhaust rocker arm assembly, and described the first push rod is for promoting described exhaust valve by the clutch shaft bearing on described exhaust rocker arm assembly.
Preferably, in above-mentioned motor, the intake rocker assembly of described distribution device is arranged on the described upper rocker arm axle in described the second gap, described intake valve is fixedly connected with described intake rocker assembly, and described the second push rod is for promoting described intake valve by the 3rd bearing on described intake rocker assembly.
Preferably, in above-mentioned motor, on the first lower shake-changing arm of described distribution device, be provided with the second bearing, described the second bearing is for supporting and promote described the first push rod.
Preferably, in above-mentioned motor, be provided with the 4th bearing on the second lower shake-changing arm of described distribution device, described the 4th bearing is for supporting and promote described the second push rod.
Preferably, in above-mentioned motor, the contact jaw of the first lower shake-changing arm of described distribution device and the cam of described distribution device is provided with the 5th bearing, and the contact jaw of the second lower shake-changing arm of described distribution device and the cam of described distribution device is provided with the 6th bearing.
Above-mentioned background technology relatively, motor provided by the present invention; rocker arm support and cylinder head are integral type structure; strengthened the structural rigidity of motor, integrally-built temperature distortion is little in the course of the work to make motor, simultaneously; reduced rocker arm support stress deformation under external force; ensured the quality of fit of cylinder head and rocker arm support, has further ensured the integrally-built quality of fit of motor, has reduced the cylinder head noise causing because of malformation in engine working process.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the distribution device of CG motor of the prior art;
Fig. 2 is the plan view of the distribution device of CG motor provided by the present invention;
Fig. 3 is the right elevation of the distribution device of CG motor provided by the present invention;
Fig. 4 is the plan view of the distribution device of CG motor provided by the present invention.
Embodiment
Core of the present invention is to provide a kind of motor, can reduce motor cylinder head noise in the course of the work.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technological scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment who obtains under creative work prerequisite, belong to the scope of protection of the invention.
Incorporated by reference to Fig. 2, Fig. 3 and Fig. 4, Fig. 2 is the plan view of the distribution device of CG motor provided by the present invention; Fig. 3 is the right elevation of the distribution device of CG motor provided by the present invention; Fig. 4 is the plan view of the distribution device of CG motor provided by the present invention.
The motor that the embodiment of the present invention provides, comprises cylinder head, rocker arm support 1 and distribution device.
Cylinder head is used for forming with the cylinder body of motor the firing chamber of motor, distribution device is arranged on cylinder head by rocker arm support, and distribution device, for the exchange of the indoor gas that burns, ensures the normal work of motor, wherein, cylinder head and rocker arm support 1 are integral type structure.
The motor that the embodiment of the present invention provides, rocker arm support 1 is integral type structure with cylinder head, rocker arm support 1 is commaterial with cylinder head, strengthen the structural rigidity of motor, while having avoided rocker arm support 1 and cylinder head to be different materials, integrally-built temperature distortion is large in the course of the work for the motor causing due to thermal expansion coefficient difference, simultaneously, reduce rocker arm support 1 stress deformation under external force, ensure the quality of fit of cylinder head and rocker arm support 1, further ensure the integrally-built quality of fit of motor, reduce in engine working process because motor overall structure is out of shape the cylinder head noise causing.
In a specific embodiment of the present invention, the rocker arm support 1 of motor comprises that three separate the boss arranging, and distribution device comprises upper rocker arm axle 2.
Three boss that separate setting of rocker arm support 1 are all integral type structure with cylinder head, be arranged in order at cylinder head top, between two adjacent boss, there is certain gap, form the first gap and the second gap, the first gap in the embodiment of the present invention is specially gap, right side as shown in Figure 2, the second gap is specially gap, left side as shown in Figure 2, and preferred, the distance in the first gap and the second gap equates.
Upper rocker arm axle 2 is an integral shaft, and on the boss arranging through three separation by the mounting hole being arranged on boss, upper rocker arm axle 2 is for being connected between distribution device and rocker arm support 1.
The motor that the embodiment of the present invention provides, rocker arm support 1 is designed to symplex structure, and with cylinder head be integral type, strengthen on the one hand the structural rigidity of rocker arm support 1, reduced on the other hand rocker arm support 1 be heated or stressed after irregular deformation, and upper rocker arm axle 2 is an integral shaft, further reduced the integrally-built irregular deformation of motor, ensure the integrally-built quality of fit of motor, reduced the cylinder head noise in engine working process.
For further optimisation technique scheme, in a specific embodiment of the present invention, the first push rod 31 of the distribution device of motor and the second push rod 32 are all vertically arranged at a side of upper rocker arm axle 2.
The motor that the embodiment of the present invention provides, the first push rod 31 and the second push rod 32 are vertically arranged, move up and down by the pilot hole being arranged on cylinder head and the cylinder body of motor, relatively in prior art, as shown in Figure 1, when the unsettled inclination of the first push rod 03 and the second push rod 08 is installed, motor in the course of the work the first push rod 03 and the second push rod 08 is not only subject to axial compression power but also be subject to radial shear power, in the embodiment of the present invention, when the first push rod 31 and the second push rod 32 vertically arrange, only be subject to axial compression power, structure stress distortion relatively of the prior art is little, ensure preferably the integrally-built quality of fit of motor, reduce the cylinder head noise of motor.
In a specific embodiment of the present invention, the exhaust valve 41 of the distribution device of motor and intake valve 42 are all vertically arranged at the opposite side of upper rocker arm axle 2.
The motor that the embodiment of the present invention provides, exhaust valve 41 and intake valve 42 all vertically arrange, be arranged at accordingly that the valve guide bushing of exhaust valve 41 on cylinder head and intake valve 42 is same vertically to be arranged, relatively in prior art, as shown in Figure 1, between exhaust valve 04 and intake valve 09, be the structure that angle arranges, the motor in the embodiment of the present invention, kinetic friction between exhaust valve 41 and intake valve 42 and valve guide bushing is relatively low, has reduced the frictional loss in engine working process.
In a specific embodiment of the present invention, in motor, the exhaust rocker arm assembly 51 of distribution device is arranged on the upper rocker arm axle 2 in the first gap, exhaust valve 41 is fixedly connected with exhaust rocker arm assembly 51, and the first push rod 31 promotes exhaust valve 41 for the clutch shaft bearing 71 by exhaust rocker arm assembly 51.
In motor, the intake rocker assembly 52 of distribution device is arranged on the upper rocker arm axle 2 in the second gap, and intake valve 42 is fixedly connected with intake rocker assembly 52, and the second push rod 32 is for promoting intake valve 42 by the 3rd bearing 73 on intake rocker assembly 52.
In motor, on the first lower shake-changing arm 61 of distribution device, be provided with the second bearing 72, the second bearings 72 for supporting and promote the first push rod 31.
In motor, on the second lower shake-changing arm 62 of distribution device, be provided with the 4th bearing 74, the four bearings 74 for supporting and promote the second push rod 32.
Exhaust process in engine working process, be specially, the cam 8 of distribution device rotates counterclockwise, cam 8 lifts promote the first lower shake-changing arm 61 and rotate, the rotation of the first lower shake-changing arm 61 just drives the second bearing 72 on the first lower shake-changing arm 61 to promote the first push rod 31 and moves up, and then promote the clutch shaft bearing 71 on exhaust rocker arm assembly 51, exhaust rocker arm assembly 51 rotates around upper rocker arm axle 2, promote exhaust valve 41 moves downward simultaneously, at this moment exhaust valve 41 is opened, waste gas starts to discharge from the firing chamber of motor, in the time that cam 8 reaches maximum lift, exhaust valve 41 also reaches maximum lift simultaneously, cam 8 is to counterclockwise continuing rotation, the lift of cam 8 reduces thereupon, the lift of exhaust valve 41 is also along with reducing simultaneously, last exhaust valve 41 cuts out, exhaust process completes.
Intake process in engine working process, be specially, after exhaust valve 41 cuts out, cam 8 also will continue to rotate counterclockwise, the lift of cam 8 promotes the second lower shake-changing arm 62 and rotates, the rotation of the second lower shake-changing arm 62 just drives the 4th bearing 74 on the second lower shake-changing arm 62 to promote the second push rod 32 and moves up, and then promote the 3rd bearing 73 on intake rocker assembly 52, intake rocker assembly 52 rotates around upper rocker arm axle 2, promote intake valve 42 moves downward simultaneously, at this moment intake valve 42 is opened, incoming mixture starts to enter tracheae and enters firing chamber, in the time that cam 8 reaches maximum lift, intake valve 42 also reaches maximum lift simultaneously, cam 8 is to counterclockwise continuing rotation, cam 8 lifts reduce thereupon, the lift of intake valve 42 is also along with reducing simultaneously, finally make intake valve 42 close, intake process completes.
The motor that the embodiment of the present invention provides, the first push rod 31 and exhaust rocker arm assembly 51, the first lower shake-changing arm 61, the place of being in transmission connection of the second push rod 32 and intake rocker assembly 52, the second lower shake-changing arm 62 is provided with rolling bearing, kinetic friction mode between the first push rod 31 and the second push rod 32 and connected element is the rolling friction between push rod end face and bearing circumferential surface, has further lowered the frictional loss in engine working process.
In order further to reduce the frictional loss in engine working process, in a specific embodiment of the present invention, in motor, the first lower shake-changing arm 61 of distribution device is provided with the 5th bearing 75 with the contact jaw of the cam 8 of distribution device, and the second lower shake-changing arm 62 and the contact jaw of the cam 8 of distribution device of distribution device are provided with the 6th bearing 76.
Cam 8 is rolling friction in rotation process and between the 5th bearing 75 and the 6th bearing 76, has reduced the frictional loss in engine working process.
Above a kind of motor provided by the present invention is described in detail.Applied specific case herein principle of the present invention and mode of execution are set forth, above embodiment's explanation is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Claims (10)
1. a motor, comprises cylinder head, rocker arm support (1) and distribution device, it is characterized in that, described cylinder head and described rocker arm support (1) are integral type structure.
2. motor as claimed in claim 1, is characterized in that, described rocker arm support (1) comprises three boss that separate and set gradually, and between two adjacent described boss, forms respectively the first gap and the second gap.
3. motor as claimed in claim 2, is characterized in that, described distribution device comprises upper rocker arm axle (2), and described upper rocker arm axle (2) is on three described boss that separate and set gradually.
4. motor as claimed in claim 3, is characterized in that, first push rod (31) of described distribution device and the second push rod (32) are all vertically arranged at a side of described upper rocker arm axle (2).
5. motor as claimed in claim 4, is characterized in that, the exhaust valve (41) of described distribution device and intake valve (42) are all vertically arranged at the opposite side of described upper rocker arm axle (2).
6. motor as claimed in claim 5, it is characterized in that, the exhaust rocker arm assembly (51) of described distribution device is arranged on the described upper rocker arm axle (2) in described the first gap, described exhaust valve (41) is fixedly connected with described exhaust rocker arm assembly (51), and described the first push rod (31) promotes described exhaust valve (41) for the clutch shaft bearing (71) by described exhaust rocker arm assembly (51).
7. motor as claimed in claim 5, it is characterized in that, the intake rocker assembly (52) of described distribution device is arranged on the described upper rocker arm axle (2) in described the second gap, described intake valve (42) is fixedly connected with described intake rocker assembly (52), and described the second push rod (32) is for promoting described intake valve (42) by the 3rd bearing (73) on described intake rocker assembly (52).
8. the motor of stating as claim 4, is characterized in that, on first lower shake-changing arm (61) of described distribution device, is provided with the second bearing (72), and described the second bearing (72) is for supporting and promote described the first push rod (31).
9. motor as claimed in claim 4, is characterized in that, is provided with the 4th bearing (74) on second lower shake-changing arm (62) of described distribution device, and described the 4th bearing (74) is for supporting and promote described the second push rod (32).
10. motor as claimed in claim 1, it is characterized in that, first lower shake-changing arm (61) of described distribution device is provided with the 5th bearing (75) with the contact jaw of the cam (8) of described distribution device, and second lower shake-changing arm (62) of described distribution device is provided with the 6th bearing (76) with the contact jaw of the cam (8) of described distribution device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310181845.0A CN104165072A (en) | 2013-05-16 | 2013-05-16 | Engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310181845.0A CN104165072A (en) | 2013-05-16 | 2013-05-16 | Engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104165072A true CN104165072A (en) | 2014-11-26 |
Family
ID=51909035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310181845.0A Pending CN104165072A (en) | 2013-05-16 | 2013-05-16 | Engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104165072A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221200A (en) * | 2015-11-05 | 2016-01-06 | 重庆驰龙摩托车配件有限公司 | A kind of motorcycle engine double-cam distribution device |
| CN109655361A (en) * | 2019-01-23 | 2019-04-19 | 安庆帝伯粉末冶金有限公司 | A kind of pipe friction testing machine |
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| JP2000080906A (en) * | 1998-09-08 | 2000-03-21 | Kubota Corp | Spindle device for rocker arm |
| CN2748644Y (en) * | 2004-02-06 | 2005-12-28 | 余小玲 | Bearing type lower rocker of CG series engine for motorcycle |
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| CN201090254Y (en) * | 2007-09-28 | 2008-07-23 | 陈吉明 | Mechanical type engine |
| CN201090306Y (en) * | 2007-05-18 | 2008-07-23 | 重庆嘉泰精密机械有限公司 | Supporting stand rocker junk head of all-purpose gasoline |
| CN101280698A (en) * | 2008-05-19 | 2008-10-08 | 无锡浜马通用机械制造有限公司 | Rocker-arm support of engine compression casting air cylinder head for booster vehicle as well as light motorcycle |
| CN201202540Y (en) * | 2008-06-05 | 2009-03-04 | 伍永亮 | Power-variable multi-cylinder diesel with pressure relief cam axle apparatus |
| CN201347806Y (en) * | 2008-12-11 | 2009-11-18 | 重庆宗申发动机制造有限公司 | Motorcycle engine cylinder head |
| CN102032008A (en) * | 2010-11-05 | 2011-04-27 | 长春市长铃技术开发有限公司 | Gas distribution mechanism of gasoline engine |
| CN102337941A (en) * | 2011-09-27 | 2012-02-01 | 上海北星实业有限公司 | Valve actuating mechanism on engine |
| CN202560338U (en) * | 2012-04-06 | 2012-11-28 | 五羊—本田摩托（广州）有限公司 | Low-wear distribution mechanism of overhead valve (OHV) engine of motor bicycle |
| CN203248263U (en) * | 2013-05-16 | 2013-10-23 | 重庆精通力阳摩托车制造有限责任公司 | Engine |
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2013
- 2013-05-16 CN CN201310181845.0A patent/CN104165072A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080906A (en) * | 1998-09-08 | 2000-03-21 | Kubota Corp | Spindle device for rocker arm |
| CN2748644Y (en) * | 2004-02-06 | 2005-12-28 | 余小玲 | Bearing type lower rocker of CG series engine for motorcycle |
| JP2007064051A (en) * | 2005-08-30 | 2007-03-15 | Honda Motor Co Ltd | Valve train support structure for internal combustion engine |
| CN201090306Y (en) * | 2007-05-18 | 2008-07-23 | 重庆嘉泰精密机械有限公司 | Supporting stand rocker junk head of all-purpose gasoline |
| CN201090254Y (en) * | 2007-09-28 | 2008-07-23 | 陈吉明 | Mechanical type engine |
| CN101280698A (en) * | 2008-05-19 | 2008-10-08 | 无锡浜马通用机械制造有限公司 | Rocker-arm support of engine compression casting air cylinder head for booster vehicle as well as light motorcycle |
| CN201202540Y (en) * | 2008-06-05 | 2009-03-04 | 伍永亮 | Power-variable multi-cylinder diesel with pressure relief cam axle apparatus |
| CN201347806Y (en) * | 2008-12-11 | 2009-11-18 | 重庆宗申发动机制造有限公司 | Motorcycle engine cylinder head |
| CN102032008A (en) * | 2010-11-05 | 2011-04-27 | 长春市长铃技术开发有限公司 | Gas distribution mechanism of gasoline engine |
| CN102337941A (en) * | 2011-09-27 | 2012-02-01 | 上海北星实业有限公司 | Valve actuating mechanism on engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105221200A (en) * | 2015-11-05 | 2016-01-06 | 重庆驰龙摩托车配件有限公司 | A kind of motorcycle engine double-cam distribution device |
| CN109655361A (en) * | 2019-01-23 | 2019-04-19 | 安庆帝伯粉末冶金有限公司 | A kind of pipe friction testing machine |
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Application publication date: 20141126 |