CN218377570U - Arrangement structure of novel transmission ratio gear and chain transmission driving camshaft - Google Patents
Arrangement structure of novel transmission ratio gear and chain transmission driving camshaft Download PDFInfo
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- CN218377570U CN218377570U CN202222751770.2U CN202222751770U CN218377570U CN 218377570 U CN218377570 U CN 218377570U CN 202222751770 U CN202222751770 U CN 202222751770U CN 218377570 U CN218377570 U CN 218377570U
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Abstract
The utility model discloses a novel arrangement structure of gear and chain drive camshaft of drive ratio, include: the chain transmission device comprises a crankshaft gear, a camshaft chain wheel, an idle gear assembly and a chain transmission system, wherein the crankshaft gear is fixedly connected with a crankshaft; the camshaft chain wheel is used for being fixedly connected with a camshaft; the idler gear assembly comprises an idler gear, a driving chain wheel and an idler shaft, wherein the idler gear is fixedly connected with the driving chain wheel, fixedly connected with the idler shaft and in transmission connection with the crankshaft gear; the chain drive system comprises a chain in driving connection with a camshaft sprocket and a drive sprocket, and a chain tensioning assembly for adjusting the tension of the chain. The utility model discloses a drive mode that gear and chain drive combined together has solved the camshaft and has kept away from the bent axle distance, can greatly increased gear quantity, makes the gear train structure complicated, the technical problem of incremental cost.
Description
Technical Field
The utility model relates to an engine cooling and lubrication system field, concretely relates to novel gear of drive ratio and arrangement structure of chain drive camshaft.
Background
The chain transmission system of the automobile engine is a complex and important mechanical transmission system with multi-disciplinary integration of mechanical, electrical, hydraulic and control in the field of mechanical transmission, is a leading research field formed on the basis of crossing over the conventional mechanical transmission technology, and particularly under the working conditions of high speed, heavy load, low noise and large center distance, the transmission performance of the chain transmission system is superior to that of toothed belt transmission and gear transmission, and the chain transmission system becomes one of the preferred transmission types of the transmission system of the high-grade automobile engine.
Gear transmission is widely used for engine power transmission as one of the most widely used mechanical transmissions. Compared with other transmission modes, the gear transmission has the advantages of accurate transmission, high efficiency, compact structure, reliable work, long service life and the like. For the engine of the valve actuating mechanism with the overhead camshaft, because the distance between the camshaft and the crankshaft is far, if the camshaft is driven by the gear, the number of the gears is greatly increased, the structure of a gear train is complicated, the cost is increased, and the defect of selecting the gear for driving is greater than the defect of benefiting. Therefore, a new drive scheme is needed to integrate the advantages of both gear drive and chain drive.
SUMMERY OF THE UTILITY MODEL
Not enough to exist among the prior art, the utility model aims at designing the arrangement structure of the gear of a novel drive ratio and chain drive camshaft, the utility model discloses a drive mode that gear and chain drive combined together has solved the camshaft and has kept away from the bent axle distance, can greatly increased gear quantity, makes the gear train structure complicated, the technical problem of incremental cost.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
an arrangement for a new ratio gear and chain drive camshaft comprising:
the crankshaft gear is used for being fixedly connected with a crankshaft;
the camshaft chain wheel is used for being fixedly connected with a camshaft;
the idler gear assembly comprises an idler gear, a driving chain wheel and an idler shaft, wherein the idler gear is fixedly connected with the driving chain wheel, fixedly connected with the idler shaft and in transmission connection with the crankshaft gear;
and a chain drive system comprising a chain in driving connection with the camshaft sprocket and the drive sprocket and a chain tensioning assembly for adjusting the tension of the chain.
Preferably, the idler gear assembly further comprises a bushing and an annular locating pin for locating the relative positions of the idler shaft and the cylinder block; an oil passage is arranged in the idler shaft, and an oil passage corresponding to the oil passage of the idler shaft is arranged in the lining.
Preferably, the chain tensioning assembly comprises a fixed rail, a movable rail and a tensioner, wherein the fixed rail and the movable rail are respectively positioned on two sides of the chain and are in interference fit with the chain; one end of the movable rail is rotationally connected with the cylinder body, and the other end of the movable rail is in driving connection with the tensioner; the tensioner is used for driving the movable rail to rotate towards the fixed rail direction so as to press the chain to be tensioned.
Preferably, the gear ratio of the crankshaft gear to the idler gear is 1.6.
Further, the center distance between the crankshaft gear and the idle gear is 117mm, and the tolerance is 0.05mm; the number of the crankshaft gears is 30, and the number of the idle gears is 48; the diameter of the base circle of the crankshaft gear is 90mm, and the diameter of the base circle of the idler gear is 144mm.
Preferably, the drive ratio of the drive sprocket and the camshaft sprocket is 1.25.
Further, the center distance between the driving chain wheel and the camshaft chain wheel is 311mm, and the tolerance is 0.12mm; the number of the drive chain wheel teeth is 32, and the number of the cam shaft chain wheel teeth is 40; the radius of the base circle of the driving chain wheel is 97.177mm, and the radius of the base circle of the camshaft chain wheel is 121.4mm.
Preferably, the crankshaft gear can simultaneously drive two sets of idle gear assemblies, and each set of idle gear assemblies is correspondingly provided with one set of chain transmission system and the camshaft chain wheel.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model relates to a novel gear of drive ratio and arrangement structure of chain drive camshaft, its simple structure is compact, reasonable in design, and the transmission is reliable, through chain drive camshaft, but the greatly reduced drive gear's quantity, reduce cost.
The utility model discloses set up crankshaft gear, idler gear, drive sprocket, camshaft sprocket, can make gear and sprocket reach certain transmission speed ratio respectively through tooth number, centre-to-centre spacing, the design of base circle radius of gear and sprocket.
The utility model discloses set up chain tensioning subassembly, can be through the cooperation of fixed rail, movable rail and tensioning ware, tensioning ware can drive the movable rail rotatory to the fixed rail direction to oppress the chain and make its tensioning.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an exploded view of the idler gear assembly of the present invention.
Reference numerals: 1. a crankshaft gear; 2. a camshaft sprocket; 3. an idler gear assembly; 31. an idler gear; 32. a drive sprocket; 33. an idler shaft; 34. a bushing; 35. an annular locating pin; 4. a chain drive system; 41. a chain; 42. a chain tensioning assembly; 421. fixing a rail; 422. moving the rail; 423. a tensioner.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the present embodiments, certain elements of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
As shown in fig. 1-2, the present invention provides an arrangement structure of a gear and chain transmission driving camshaft with a novel transmission ratio, a crankshaft gear 1, a camshaft sprocket 2, an idle gear assembly 3 and a chain transmission system 4. A crank gear 1 is operatively coupled to the engine, the crank gear 1 having a crank gear 1 centerline; the drive sprocket 32 is operatively connected to the camshaft. And a camshaft sprocket 2 fixed to the camshaft to transmit power to the camshaft.
The idler gear assembly 3 includes an idler shaft 33, an annular positioning pin 35, a bushing 34, an idler gear 31, and a drive sprocket 32 and mounting bolts. Wherein, the idler gear 31 is fixedly connected with the driving chain wheel 32, fixedly connected with the idler shaft 33 and in transmission connection with the crankshaft gear 1;
the idler shaft 33 is used for fixing the idler gear 31, positioning the position of the idler gear 31, positioning the idler gear 31 and the cylinder body by using an annular positioning pin 35, and is fixed by using bolts. The idler gear 31 fixes the driving sprocket 32 and transmits the rotation speed to the driving sprocket 32. And a driving sprocket 32 fixed to the idle gear 31 for transmitting the rotation speed of the idle gear 31 to the camshaft sprocket 2 through a chain 41. An oil passage is arranged in the idler shaft 33, and an oil passage corresponding to the oil passage of the idler shaft 33 is arranged in the bushing 34 to provide lubrication for the bushing 34. There is a center distance constraint between the annular locating pin 35 and the centerline of the crank gear 1, and the annular locating pin 35 is used to locate the relative positions of the idler shaft 33 and the cylinder block.
The chain transmission system 4 includes a chain 41 and a chain tensioner assembly 42, the chain 41 is in driving connection with the camshaft sprocket 2 and the drive sprocket 32, the chain 41 transmits the rotational speed of the drive sprocket 32 to the camshaft sprocket 2, and the chain tensioner assembly 42 is used for adjusting the tension of the chain 41. Specifically, the chain tensioning assembly 42 includes a fixed rail 421, a movable rail 422 and a tensioner 423, the movable rail 422 and the fixed rail 421 function to fix the chain 41, and the chain tensioning assembly 42 functions to tension the chain 41. The fixed rail 421 and the movable rail 422 are respectively located at two sides of the chain 41 and are both abutted against the chain 41 to form a sliding fit relationship; one end of the movable rail 422 is rotationally connected with the cylinder body, and the other end of the movable rail 422 is in driving connection with the tensioner 423; the tensioner 423 drives the movable rail 422 to rotate in the direction of the fixed rail 421, so as to press and tension the chain 41.
The transmission ratio of the crankshaft gear 1 to the idler gear 31 is i 1 ＝Z 2 /Z 1 =48:30=1.6, wherein Z 1 And Z 2 Respectively, the numbers of teeth of the crank gear 1 and the idle gear 31. Further, the center distance between the crank gear 1 and the idle gear 31 is 117mm, and the tolerance is 0.05mm; the number of teeth of the crankshaft gear 1 is 30, and the number of teeth of the idle gear 31 is 48; the diameter of the base circle of the crankshaft gear 1 is 90mm, and the diameter of the base circle of the idle gear 31 is 144mm.
Drive ratio i of drive sprocket 32 and camshaft sprocket 2 2 ＝Z 2 /Z 1 =40:32=1.25, wherein Z 1 And Z 2 Respectively, represent the number of teeth of the drive sprocket 32 and the camshaft sprocket 2. Further, the center distance between the drive sprocket 32 and the camshaft sprocket 2 is 311mm, and the tolerance is 0.12mm; the number of teeth of the driving chain wheel 32 is 32, and the number of teeth of the camshaft chain wheel 2 is 40; the base radius of the drive sprocket 32 is 97.177mm, and the base radius of the camshaft sprocket 2 is 121.4mm.
In one embodiment, the crankshaft gear 1 can drive two sets of idler gear assemblies 3 simultaneously, and each set of idler gear assemblies 3 is provided with a set of chain transmission system 4 and camshaft sprocket 2.
The utility model relates to a novel gear of drive ratio and arrangement structure of chain drive camshaft, its simple structure is compact, reasonable in design, and the transmission is reliable, through chain drive camshaft, but the greatly reduced drive gear's quantity, reduce cost.
According to the description and the drawings of the present invention, the person skilled in the art can easily make or use the arrangement of the gear and chain drive camshaft of a new transmission ratio, and can produce the positive effects described in the present invention.
Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship indicated on the drawings, it is only for convenience of describing the present invention and simplifying the description, but it does not indicate or imply that the device or element to be referred must have a specific orientation, be constructed in a specific orientation and be operated, therefore, the terms describing the orientation or positional relationship in the present invention are only used for illustrative purposes and are not to be construed as limiting the present patent, and those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances with reference to the drawings.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass both fixed and removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (8)
1. An arrangement for a novel ratio gear and chain drive camshaft comprising:
the crankshaft gear (1), the said crankshaft gear (1) is used for fixedly connecting with crankshaft;
the camshaft chain wheel (2), the camshaft chain wheel (2) is used for being fixedly connected with a camshaft;
the idler gear assembly (3), the idler gear assembly (3) comprises an idler gear (31), a driving chain wheel (32) and an idler shaft (33), wherein the idler gear (31) is fixedly connected with the driving chain wheel (32), fixedly connected with the idler shaft (33) and in transmission connection with the crankshaft gear (1);
and a chain transmission system (4), the chain transmission system (4) comprising a chain (41) and a chain tensioning assembly (42), wherein the chain (41) is in driving connection with the camshaft sprocket (2) and the drive sprocket (32), the chain tensioning assembly (42) being for adjusting the tension of the chain (41).
2. The novel ratio gear and chain drive camshaft arrangement of claim 1, wherein: the idler gear assembly (3) further comprises a bushing (34) and an annular positioning pin (35), wherein the annular positioning pin (35) is used for positioning the relative position of the idler shaft (33) and the cylinder body; an oil passage is arranged in the idler shaft (33), and an oil passage corresponding to the oil passage of the idler shaft (33) is arranged in the bushing (34).
3. The novel ratio gear and chain drive camshaft arrangement of claim 1, wherein: the chain tensioning assembly (42) comprises a fixed rail (421), a movable rail (422) and a tensioner (423), wherein the fixed rail (421) and the movable rail (422) are respectively positioned on two sides of the chain (41) and are abutted against the chain (41) to form a sliding fit relation; one end of the movable rail (422) is rotationally connected with the cylinder body, and the other end of the movable rail is in driving connection with the tensioner (423); the tensioner (423) is used for driving the movable rail (422) to rotate towards the fixed rail (421) so as to press the chain (41) to be tensioned.
4. The gear and chain drive camshaft arrangement of new gear ratio as set forth in claim 1, wherein: the transmission ratio of the crankshaft gear (1) to the idle gear (31) is 1.6.
5. The novel gear ratio gear and chain drive camshaft arrangement of claim 4, wherein: the center distance between the crankshaft gear (1) and the idle gear (31) is 117mm, and the tolerance is 0.05mm; the number of teeth of the crankshaft gear (1) is 30, and the number of teeth of the idle gear (31) is 48; the diameter of the base circle of the crankshaft gear (1) is 90mm, and the diameter of the base circle of the idle gear (31) is 144mm.
6. The novel ratio gear and chain drive camshaft arrangement of claim 1, wherein: the drive ratio of the drive sprocket (32) to the camshaft sprocket (2) is 1.25.
7. The novel ratio gear and chain drive camshaft arrangement of claim 6, wherein: the center distance between the driving chain wheel (32) and the camshaft chain wheel (2) is 311mm, and the tolerance is 0.12mm; the number of teeth of the driving chain wheel (32) is 32, and the number of teeth of the camshaft chain wheel (2) is 40; the base circle radius of the driving chain wheel (32) is 97.177mm, and the base circle radius of the camshaft chain wheel (2) is 121.4mm.
8. The novel ratio gear and chain drive camshaft arrangement of claim 1, wherein: the crankshaft gear (1) can drive two groups of idle gear assemblies (3) at the same time, and each group of idle gear assemblies (3) is correspondingly provided with one group of chain transmission system (4) and the camshaft chain wheel (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222751770.2U CN218377570U (en) | 2022-10-19 | 2022-10-19 | Arrangement structure of novel transmission ratio gear and chain transmission driving camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222751770.2U CN218377570U (en) | 2022-10-19 | 2022-10-19 | Arrangement structure of novel transmission ratio gear and chain transmission driving camshaft |
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| Publication Number | Publication Date |
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| CN218377570U true CN218377570U (en) | 2023-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222751770.2U Active CN218377570U (en) | 2022-10-19 | 2022-10-19 | Arrangement structure of novel transmission ratio gear and chain transmission driving camshaft |
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| CN (1) | CN218377570U (en) |
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- 2022-10-19 CN CN202222751770.2U patent/CN218377570U/en active Active
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