CN108915814B - Cam shaft driving device of common rail diesel engine - Google Patents
Cam shaft driving device of common rail diesel engine Download PDFInfo
- Publication number
- CN108915814B CN108915814B CN201810987577.4A CN201810987577A CN108915814B CN 108915814 B CN108915814 B CN 108915814B CN 201810987577 A CN201810987577 A CN 201810987577A CN 108915814 B CN108915814 B CN 108915814B
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- Prior art keywords
- hub
- cylinder
- hole
- cam shaft
- thrust
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
- F01M9/10—Lubrication of valve gear or auxiliaries
Abstract
The invention belongs to the technical field of machinery, and provides a cam shaft driving device of a common rail diesel engine. The proposed common rail diesel engine camshaft driving device has a hub in the shape of a stepped shaft; the center of the hub is provided with a stepped through hole; the right end face of the hub is provided with a blind hole in interference fit with the cam shaft; the hub is provided with a radial oil hole communicated with the stepped through hole; the center of the cam shaft is provided with a pressure lubrication oil duct II communicated with the stepped through hole; the left end of the cam shaft is in interference fit with the hub, and the right end of the cam shaft extends out of the hub and is supported in the machine body through the cam shaft bushing; the front end cover is sleeved on the hub, and a bearing bush which is in clearance fit with the hub is arranged between the front end cover and the hub; the gap between the bearing bush and the hub is communicated with the radial oil hole; the hub is sleeved with a driving gear which is in clearance fit with the hub; the left end of the hub is fixed with a thrust device. The invention effectively avoids abnormal abrasion of the driving end cam shaft lining; the reliability of the camshaft drive device is improved.
Description
Technical Field
The invention belongs to the technical field of machinery, and particularly relates to a cam shaft driving device of a common rail diesel engine.
Background
The camshaft is an important part of the diesel engine, and controls the valve to be opened and closed quantitatively at fixed time by driving the rocker arm and the valve mechanism, so as to provide fresh air necessary for combustion in the cylinder for the diesel engine and ensure that the diesel engine outputs power to the outside.
The camshaft driving device is an important component of a diesel engine gas distribution system, provides power for the camshaft, drives the camshaft to rotate, and directly determines the working reliability of the camshaft according to a reasonable design method; meanwhile, due to the axial thrust action of the driving bevel gear, the camshaft can generate axial movement in the working process, which is disadvantageous to the normal operation of the camshaft, and a reasonable camshaft thrust device must be designed to eliminate the adverse effect; for many common rail diesel engines, the arrangement of the common rail pump gears and their idler gear mechanisms within the gear box is required, and in such a small space, it is very difficult to arrange the camshaft drive mechanism.
For high-speed high-power common rail diesel engines, a reasonably designed camshaft drive is a problem that many diesel engine design manufacturers must consider.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a common rail diesel engine camshaft driving device.
The invention adopts the following technical scheme to complete the tasks:
a common rail diesel engine camshaft driving device is provided with a hub; the hub is of a stepped shaft-shaped structure formed by a plurality of sections of cylinders with different diameters; the cylinders with different diameters are a first cylinder, a second cylinder, a third cylinder and a fourth cylinder from left to right in sequence, and a circular boss protruding leftwards is arranged at the center of the first cylinder; the diameter of the second cylinder is smaller than that of the first cylinder, the diameter of the first cylinder is smaller than that of the third cylinder, and the diameter of the third cylinder is smaller than that of the fourth cylinder; the center of the hub is provided with a stepped through hole; the stepped through hole is provided with a threaded hole, an orifice, a pressure lubrication oil duct I and an oil groove in sequence from left to right; the diameter of the throttle hole is smaller than that of the threaded hole; the diameter of the threaded hole is the same as that of the pressure lubrication oil duct I; the right end face of the hub is provided with a blind hole in interference fit with a cam shaft; the center of the bottom surface of the blind hole is provided with a notch communicated with a pressure lubrication oil duct I; the groove is communicated with the pressure lubrication oil duct I and the oil groove; the hub is provided with a radial oil hole communicated with the pressure lubrication oil duct I; the center of the cam shaft is provided with a pressure lubrication oil duct II communicated with the pressure lubrication oil duct I; the left end of the cam shaft is in interference fit with the hub, and the right end of the cam shaft extends out of the hub and is supported in the machine body through a cam shaft bushing; a front end cover is sleeved on the first cylinder of the hub, and a bearing bush which is in clearance fit with the first cylinder is arranged between the front end cover and the first cylinder of the hub; the outer ring of the bearing bush is in interference fit with the front end cover, and the inner ring is in clearance fit with the outer circle of the first cylinder to form a floating support of the hub; the gap between the bearing bush and the first cylinder is communicated with the radial oil hole; one end of the hub is in interference connection with the cam shaft, the other end of the hub is floatingly arranged in the bearing bush of the front end cover, an oil film is established between the bearing bush and the hub when the diesel engine works, the oil film bears the gravity of each accessory at the driving end of the cam shaft, and abnormal abrasion of the cam shaft bush at the driving end is effectively avoided; a driving gear in clearance fit with the third cylinder of the hub is sleeved on the third cylinder; the driving gear sleeved on the third cylinder is fixedly connected with a fourth cylinder of the hub; a thrust device is fixed at the left end of the hub; the thrust device is provided with a connecting flange sleeved on the circular boss at the left end of the hub; the connecting flange is in clearance fit with the circular boss; the connecting flange is fixedly connected with the hub; a thrust ring is arranged between the connecting flange and the bearing bush; the thrust ring is sleeved on the first cylinder and fixedly connected with the front end cover; the thrust device also comprises a thrust disc; the thrust disc is positioned at the left side of the thrust ring and fixedly connected with the front end cover; the front end cover is sealed with the outer circle of the thrust disc through a sealing ring; the thrust disc is of a stepped shaft-shaped structure formed by a large-diameter shaft and a small-diameter shaft; the large-diameter shaft is positioned at the left side of the small-diameter shaft; a gap of 0.1mm is formed between the right end face of the thrust disc and the left end face of the connecting flange; the center of the right end face of the thrust plate is provided with a groove which is concave inwards; the groove is communicated with the threaded hole in the center of the hub to form a lubricating oil groove for lubricating the gap between the thrust cover and the connecting flange.
The center of the driving gear is provided with a through hole which is in clearance fit with the hub; a plurality of helical teeth for matching with the driving helical gear of the common rail diesel engine are uniformly distributed on the outer circle of the driving gear; the driving gear is provided with a connecting through hole for fixedly connecting with the hub; the connecting through holes are uniformly distributed along the axis of the through holes; the driving gear is also provided with a positioning pin hole which is fixedly connected with the hub.
The fourth cylinder of the hub is provided with a plurality of connecting holes and a pin hole for fixedly connecting with the driving gear.
The connecting flange is a disc with a through hole in the center, and the through hole in the center of the connecting flange is in clearance fit with the circular boss on the hub.
The common rail diesel engine camshaft driving device provided by the invention has the following beneficial effects by adopting the technical scheme:
1) One end of the hub is in interference connection with the cam shaft, the other end of the hub is arranged in the inner hole of the bearing bush of the front end cover in a floating mode, an oil film is established between the bearing bush and the hub when the diesel engine works, the oil film bears the gravity of each accessory at the driving end of the cam shaft, and abnormal abrasion of the cam shaft bush at the driving end is effectively avoided; the reliability of the camshaft driving device is improved;
2) For many common rail diesel engines, it is necessary to arrange the common rail pump gears and their idler mechanisms within the gear box, which requires the camshaft drive to prevent interference in the area overlapping with it; in the technical scheme, one end of the hub is in interference connection with the cam shaft, so that a screw is not required to be arranged on the hub to be connected with the cam shaft, the diameter of the outer circle of the third stepped shaft on the right side of the hub is greatly reduced, and the problem that a driving device interferes with other gear parts is solved;
3) When the diesel engine works, the camshaft driving gear 3 plays a role in the axial thrust of the driving helical gear and axially moves along the camshaft, and if the movement is not controlled, the abrasion of parts such as a camshaft bushing, a cam, a tappet and the like can be increased; according to the technical scheme, the thrust device is arranged, and reasonable gaps are designed between the thrust disc and the connecting flange and between the connecting flange and the thrust ring, so that the movement amount of the camshaft is controllable when the camshaft moves leftwards or rightwards along the axial direction.
4) In order to avoid abnormal abrasion between the bearing bush and the hub and between the thrust components, the technical scheme designs a pressure lubrication channel, namely engine oil with certain pressure flows through a central hole of the hub from an oil hole in the middle of the cam shaft, then one part of engine oil enters between the bearing bush and a working journal of the hub through a radial oil hole on the hub to realize pressure lubrication, and the other part of engine oil enters a cavity of the thrust disc through an orifice and flows into a space between the thrust disc and the connecting flange and between the connecting flange and the thrust ring to realize pressure lubrication.
5) The thrust ring, the connecting flange and the thrust disc are all consumable parts, and have a certain life cycle and need to be regularly overhauled or replaced; the convex wheel shaft thrust assembly is designed on the outer side of the front end cover, and when the convex wheel shaft thrust assembly is dismounted, the dismounting of the thrust assembly is completed only by sequentially dismounting the fastening bolt II, the thrust disc, the fastening bolt I, the connecting flange and the thrust ring, and the mounting method is opposite to the steps of the dismounting, and the front end cover and other complex parts are not required to be dismounted in the whole dismounting or mounting process.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of a hub according to the present invention.
In the figure: 1. a hub; 1-1 parts of a first cylinder, 1-2 parts of a second cylinder, 1-3 parts of a third cylinder, 1-4 parts of a fourth cylinder, 1-5 parts of a circular boss, 1-6 parts of a threaded hole, 1-7 parts of an orifice, 1-8 parts of a pressure lubrication oil duct I, 1-9 parts of a radial oil hole, 2 parts of a clamping pin; 3. a drive gear; 4. a fastening bolt I; 5. a bearing bush; 6. a positioning pin; 7. a thrust collar; 8. a connecting flange; 9. fastening a bolt II; 10. a thrust plate; 11. the device comprises a sealing ring, 12 parts of a cam shaft, 12-1 parts of a pressure lubrication oil duct II, 13 parts of a cam shaft bushing, 14 parts of a machine body, 15 parts of a machine body and a front end cover.
Detailed Description
The following describes the embodiments of the present invention further with reference to the accompanying drawings:
as shown in fig. 1, a common rail diesel engine camshaft drive device has a hub 1; referring to fig. 2, the hub 1 is a stepped shaft structure formed by a plurality of sections of cylinders with different diameters; the cylinders with different diameters are a first cylinder 1-1, a second cylinder 1-2, a third cylinder 1-3 and a fourth cylinder 1-4 in sequence from left to right, and a circular boss 1-5 protruding leftwards is arranged at the center of the first cylinder 1-1; the diameter of the second cylinder 1-2 is smaller than that of the first cylinder 1-1, the diameter of the first cylinder 1-1 is smaller than that of the third cylinder 1-3, and the diameter of the third cylinder 1-3 is smaller than that of the fourth cylinder 1-4; the center of the hub 1 is provided with a stepped through hole; the stepped through hole is provided with a threaded hole 1-6, an orifice 1-7, a pressure lubrication oil duct I1-8 and an oil groove in sequence from left to right; the diameter of the throttle hole 1-7 is smaller than that of the threaded hole 1-6; the diameter of the threaded hole 1-6 is the same as that of the pressure lubrication oil duct I1-8; the right end face of the hub 1 is provided with a blind hole in interference fit with a cam shaft; the center of the bottom surface of the blind hole is provided with a notch communicated with the pressure lubrication oil duct I1-8; the groove is communicated with the pressure lubrication oil channels I1-8 and the oil groove; the hub 1 is provided with radial oil holes 1-9 communicated with the pressure lubrication oil duct I; the center of the camshaft 12 is provided with a pressure lubrication oil duct II 12-1 communicated with the pressure lubrication oil duct I1-9; the left end of the cam shaft 12 is in interference fit with the hub 1, and the right end of the cam shaft 12 extends out of the hub 1 and is supported in the machine body 14 through a cam shaft bushing 13; a front end cover 15 is sleeved on the first cylinder 1-1 of the hub, and a bearing bush 5 which is in clearance fit with the first cylinder is arranged between the front end cover 15 and the first cylinder of the hub; the outer ring of the bearing bush 5 is in interference fit with the front end cover 15, and the inner ring is in clearance fit with the outer circle of the first cylinder to form a floating support of the hub; the gap between the bearing bush 5 and the first cylinder is communicated with the radial oil holes 1-9; one end of the hub 1 is in interference connection with the cam shaft 12, the other end of the hub is floatingly arranged in the bearing bush 5 of the front end cover, an oil film is established between the bearing bush and the hub when the diesel engine works, the oil film bears the gravity of accessories at the driving end of the cam shaft, and abnormal abrasion of the cam shaft bush at the driving end is effectively avoided; a driving gear 3 in clearance fit with the third cylinder 1-3 of the hub is sleeved on the third cylinder; the driving gear 3 sleeved on the third cylinder is fixedly connected with the fourth cylinder 1-4 of the hub through a fastening bolt I4 and a clamping pin 2; ten fastening bolts I4 are arranged; the clamping pin 2 is one; a thrust device is fixed at the left end of the hub 1; the thrust device is provided with a connecting flange 8 sleeved on the circular boss 1-5 at the left end of the hub; the connecting flange is a disc with a through hole in the center, and the through hole in the center of the connecting flange is in clearance fit with the circular boss 1-5 on the hub; the connecting flange 8 is fixedly connected with the hub 1; a thrust ring 7 is arranged between the connecting flange 8 and the bearing bush 5; the thrust ring 7 is sleeved on the first cylinder 1-1 and fixedly connected with the front end cover 15 through a locating pin 6; the thrust device also comprises a thrust disc 10; the thrust disc 10 is positioned at the left side of the thrust ring 7 and fixedly connected with the front end cover 15; the front end cover 15 is sealed with the outer circle of the thrust disc through a sealing ring 11; the thrust disc 10 is of a stepped shaft-shaped structure formed by a large-diameter shaft and a small-diameter shaft; the large-diameter shaft is positioned at the left side of the small-diameter shaft; a gap of 0.1mm is formed between the right end face of the thrust disc and the left end face of the connecting flange; the center of the right end face of the thrust plate is provided with a groove which is concave inwards; the groove is communicated with the threaded hole in the center of the hub to form a lubricating oil groove for lubricating the gap between the thrust cover and the connecting flange.
The center of the driving gear is provided with a through hole which is in clearance fit with the hub; a plurality of helical teeth for matching with the driving helical gear of the common rail diesel engine are uniformly distributed on the outer circle of the driving gear; the driving gear is provided with a connecting through hole for fixedly connecting with the hub; the connecting through holes are uniformly distributed along the axis of the through holes; the driving gear is also provided with a positioning pin hole which is fixedly connected with the hub.
The fourth cylinder of the hub is provided with a plurality of connecting holes and a pin hole for fixedly connecting with the driving gear.
In order to avoid abnormal wear between the bearing bush 5 and the hub 1 and between the thrust components, when the anti-friction device is used, engine oil with certain pressure flows through the pressure lubrication oil duct I of the hub 1 from the pressure lubrication oil duct II in the middle of the cam shaft, then part of the engine oil enters between the bearing bush 5 and the working journal of the hub 1 through the radial oil hole on the hub to realize pressure lubrication, and the other part of the engine oil enters into the groove of the thrust disc through the orifice and flows into the space between the thrust disc 10 and the connecting flange 8 and between the connecting flange 8 and the thrust ring 7 to realize pressure lubrication.
Claims (4)
1. A common rail diesel engine camshaft driving device is provided with a hub; the method is characterized in that; the hub is of a stepped shaft-shaped structure formed by a plurality of sections of cylinders with different diameters; the cylinders with different diameters are a first cylinder, a second cylinder, a third cylinder and a fourth cylinder from left to right in sequence, and a circular boss protruding leftwards is arranged at the center of the first cylinder; the diameter of the second cylinder is smaller than that of the first cylinder, the diameter of the first cylinder is smaller than that of the third cylinder, and the diameter of the third cylinder is smaller than that of the fourth cylinder; the center of the hub is provided with a stepped through hole; the stepped through hole is provided with a threaded hole, an orifice, a pressure lubrication oil duct I and an oil groove in sequence from left to right; the diameter of the throttle hole is smaller than that of the threaded hole; the diameter of the threaded hole is the same as that of the pressure lubrication oil duct I; the right end face of the hub is provided with a blind hole in interference fit with a cam shaft; the center of the bottom surface of the blind hole is provided with a notch communicated with a pressure lubrication oil duct I; the groove is communicated with the pressure lubrication oil duct I and the oil groove; the hub is provided with a radial oil hole communicated with the pressure lubrication oil duct I; the center of the cam shaft is provided with a pressure lubrication oil duct II communicated with the pressure lubrication oil duct I; the left end of the cam shaft is in interference fit with the hub, and the right end of the cam shaft extends out of the hub and is supported in the machine body through a cam shaft bushing; a front end cover is sleeved on the first cylinder of the hub, and a bearing bush which is in clearance fit with the first cylinder is arranged between the front end cover and the first cylinder of the hub; the outer ring of the bearing bush is in interference fit with the front end cover, and the inner ring is in clearance fit with the outer circle of the first cylinder to form a floating support of the hub; the gap between the bearing bush and the first cylinder is communicated with the radial oil hole; one end of the hub is in interference connection with the cam shaft, the other end of the hub is floatingly arranged in the bearing bush of the front end cover, an oil film is established between the bearing bush and the hub when the diesel engine works, the oil film bears the gravity of each accessory at the driving end of the cam shaft, and abnormal abrasion of the cam shaft bush at the driving end is effectively avoided; a driving gear in clearance fit with the third cylinder of the hub is sleeved on the third cylinder; the driving gear sleeved on the third cylinder is fixedly connected with a fourth cylinder of the hub; a thrust device is fixed at the left end of the hub; the thrust device is provided with a connecting flange sleeved on the circular boss at the left end of the hub; the connecting flange is in clearance fit with the circular boss; the connecting flange is fixedly connected with the hub; a thrust ring is arranged between the connecting flange and the bearing bush; the thrust ring is sleeved on the first cylinder and fixedly connected with the front end cover; the thrust device also comprises a thrust disc; the thrust disc is positioned at the left side of the thrust ring and fixedly connected with the front end cover; the front end cover is sealed with the outer circle of the thrust disc through a sealing ring; the thrust disc is of a stepped shaft-shaped structure formed by a large-diameter shaft and a small-diameter shaft; the large-diameter shaft is positioned at the left side of the small-diameter shaft; a gap of 0.1mm is formed between the right end face of the thrust disc and the left end face of the connecting flange; the center of the right end face of the thrust plate is provided with a groove which is concave inwards; the groove is communicated with the threaded hole in the center of the hub to form a lubricating oil groove for lubricating the gap between the thrust cover and the connecting flange.
2. The common rail diesel engine camshaft drive device according to claim 1, wherein; the center of the driving gear is provided with a through hole which is in clearance fit with the hub; a plurality of helical teeth for matching with the driving helical gear of the common rail diesel engine are uniformly distributed on the outer circle of the driving gear; the driving gear is provided with a connecting through hole for fixedly connecting with the hub; the connecting through holes are uniformly distributed along the axis of the through holes; the driving gear is also provided with a positioning pin hole which is fixedly connected with the hub.
3. The common rail diesel engine camshaft drive device according to claim 1, wherein; the fourth cylinder of the hub is provided with a plurality of connecting holes and a pin hole for fixedly connecting with the driving gear.
4. The common rail diesel engine camshaft drive device according to claim 1, wherein; the connecting flange is a disc with a through hole in the center, and the through hole in the center of the connecting flange is in clearance fit with the circular boss on the hub.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987577.4A CN108915814B (en) | 2018-08-28 | 2018-08-28 | Cam shaft driving device of common rail diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987577.4A CN108915814B (en) | 2018-08-28 | 2018-08-28 | Cam shaft driving device of common rail diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108915814A CN108915814A (en) | 2018-11-30 |
| CN108915814B true CN108915814B (en) | 2023-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810987577.4A Active CN108915814B (en) | 2018-08-28 | 2018-08-28 | Cam shaft driving device of common rail diesel engine |
Country Status (1)
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| CN (1) | CN108915814B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS648508U (en) * | 1987-07-07 | 1989-01-18 | ||
| US5111780A (en) * | 1988-07-15 | 1992-05-12 | Audi Ag | Drive arrangement for a camshaft in an internal combustion engine |
| JPH10196322A (en) * | 1997-01-17 | 1998-07-28 | Mitsubishi Motors Corp | Cam control device for engine |
| DE10141213A1 (en) * | 2001-08-23 | 2003-03-06 | Bayerische Motoren Werke Ag | Arrangement of a camshaft in the cylinder head of an internal combustion engine |
| CN2908795Y (en) * | 2006-02-27 | 2007-06-06 | 运城常运动力机械有限公司 | Anti-running mechanism of camshaft |
| CN105298571A (en) * | 2015-11-29 | 2016-02-03 | 重庆元创汽车整线集成有限公司 | Axial limiting structure for cam shaft |
| CN106133313A (en) * | 2014-02-03 | 2016-11-16 | 康明斯公司 | The camshaft thrust guaranteed by travelling gear is controlled |
| CN106640249A (en) * | 2016-11-17 | 2017-05-10 | 河南柴油机重工有限责任公司 | Engine camshaft duplex bevel gear transmission device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208950659U (en) * | 2018-08-28 | 2019-06-07 | 河南柴油机重工有限责任公司 | A kind of common rail diesel engine camshaft drive |
-
2018
- 2018-08-28 CN CN201810987577.4A patent/CN108915814B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS648508U (en) * | 1987-07-07 | 1989-01-18 | ||
| US5111780A (en) * | 1988-07-15 | 1992-05-12 | Audi Ag | Drive arrangement for a camshaft in an internal combustion engine |
| JPH10196322A (en) * | 1997-01-17 | 1998-07-28 | Mitsubishi Motors Corp | Cam control device for engine |
| DE10141213A1 (en) * | 2001-08-23 | 2003-03-06 | Bayerische Motoren Werke Ag | Arrangement of a camshaft in the cylinder head of an internal combustion engine |
| CN2908795Y (en) * | 2006-02-27 | 2007-06-06 | 运城常运动力机械有限公司 | Anti-running mechanism of camshaft |
| CN106133313A (en) * | 2014-02-03 | 2016-11-16 | 康明斯公司 | The camshaft thrust guaranteed by travelling gear is controlled |
| CN105298571A (en) * | 2015-11-29 | 2016-02-03 | 重庆元创汽车整线集成有限公司 | Axial limiting structure for cam shaft |
| CN106640249A (en) * | 2016-11-17 | 2017-05-10 | 河南柴油机重工有限责任公司 | Engine camshaft duplex bevel gear transmission device |
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| Publication number | Publication date |
|---|---|
| CN108915814A (en) | 2018-11-30 |
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