CN211500820U - Upper and lower box-closing type engine crankcase structure for motorcycle - Google Patents
Upper and lower box-closing type engine crankcase structure for motorcycle Download PDFInfo
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- CN211500820U CN211500820U CN201922495722.XU CN201922495722U CN211500820U CN 211500820 U CN211500820 U CN 211500820U CN 201922495722 U CN201922495722 U CN 201922495722U CN 211500820 U CN211500820 U CN 211500820U
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- box body
- crankshaft
- lower box
- type engine
- box
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Abstract
The utility model relates to a motorcycle is with closing box engine crankcase structure from top to bottom, including the last box and the lower box of upper and lower relative setting to and install the bent axle in last box and lower box, go up and be provided with a plurality of semicircular bent axle seats on the mould assembling face of box and lower box relatively, and the relative bent axle seat constitutes circular shape bent axle hole from top to bottom, and the bent axle passes through the bearing to be installed in the bent axle hole, is provided with semicircular footstep bearing between the crank of bent axle and the lateral wall of the internal bent axle seat of last box. The utility model discloses a mould assembling from top to bottom, the dismouting is simple, easy maintenance.
Description
Technical Field
The utility model belongs to the technical field of the motorcycle crankcase, concretely relates to motorcycle is with closing box engine crankcase structure from top to bottom.
Background
The crankcase of the traditional motorcycle transmitter adopts a left and right box closing structure, and the left and right box bodies have uneven strength. And the left and right box bodies form a whole after being assembled, when the interior of the box body breaks down and needs to be maintained, the whole engine needs to be completely disassembled, and the operation is very troublesome.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a motorcycle is with closing box engine crankcase structure from top to bottom to solve the trouble problem of crankcase later maintenance.
The utility model discloses a motorcycle is with closing box engine crankcase structure from top to bottom is realized like this:
an upper and lower combined box type engine crankcase structure for a motorcycle comprises an upper box body and a lower box body which are arranged oppositely from top to bottom, and a crankshaft arranged in the upper box body and the lower box body, wherein a plurality of semicircular crankshaft seats are oppositely arranged on the combined box surfaces of the upper box body and the lower box body, the upper and lower opposite crankshaft seats form a circular crankshaft hole, the crankshaft is arranged in the crankshaft hole through a bearing, and a semicircular thrust bearing is arranged between the crank of the crankshaft and the side wall of the crankshaft seat in the upper box body.
Furthermore, four crank seats are respectively arranged in the upper box body and the lower box body.
Further, thrust bearing mounting surfaces are arranged on opposite side surfaces of the two crankshaft seats positioned in the middle in the upper box body.
Furthermore, the bent axle includes main journal I to and set up respectively two pairs of cranks at I both ends of main journal, the articulate outer end is provided with main journal II, main journal I and main journal II install on the bent axle seat.
Furthermore, a chain wheel is installed on the main journal I.
Furthermore, both ends of the crankshaft seat are provided with mounting holes I, and the corresponding crankshaft seats on the upper box body and the lower box body are connected through bolts arranged in the mounting holes I.
Furthermore, a positioning hole is correspondingly arranged between the upper box body and the lower box body.
Furthermore, the upper box body and the lower box body are provided with mounting holes II for connecting the upper box body and the lower box body.
Further, oil duct nozzle mounting holes are respectively formed in the upper box body and the lower box body.
After the technical scheme is adopted, the utility model discloses the beneficial effect who has does:
(1) the crankcase of the utility model is assembled by adopting an upper and a lower box-closing mode, and the crankshaft hole is arranged on the box-closing surface of the upper box body and the lower box body, so that the lower box body only needs to be disassembled from the upper box body during later maintenance, and the operation is simple without disassembling the lower box body;
(2) the utility model discloses set up semicircular footstep bearing between bent axle and bent axle seat, can prevent to produce abnormal wear between bent axle and the box to only set up footstep bearing in last box, can reduce footstep bearing's installation quantity, reduce the processing cost.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a left side sectional view of a crankcase structure of an upper and lower box-type engine for a motorcycle according to a preferred embodiment of the present invention;
FIG. 2 is a partial sectional bottom view of the crankcase cover of the upper and lower box-type engine crankcase structure for motorcycle according to the preferred embodiment of the present invention;
FIG. 3 is a structural view of an upper case of a crankcase structure of an upper and lower box type engine for a motorcycle according to a preferred embodiment of the present invention;
FIG. 4 is a structural view of an upper case of a crankcase structure of an upper and lower box type engine for a motorcycle according to a preferred embodiment of the present invention;
FIG. 5 is a structural view of a lower case of a crankcase structure of an upper and lower box type engine for a motorcycle according to a preferred embodiment of the present invention;
FIG. 6 is a structural view of a lower case of a crankcase structure of an upper and lower box type engine for a motorcycle according to a preferred embodiment of the present invention;
FIG. 7 is a sectional view of a crankshaft of a crankcase structure of an upper and lower box type engine for a motorcycle according to a preferred embodiment of the present invention;
in the figure: the structure comprises an upper box body 1, a lower box body 2, a crankshaft 3, a main journal I31, a crank 32, a main journal II 33, a chain wheel 34, a crankshaft seat 4, a crankshaft hole 5, a thrust bearing 6, a main shaft hole 7, an auxiliary shaft hole 8, a balance shaft hole 9, a thrust bearing mounting surface 10, a mounting hole I11, a positioning hole 12, a mounting hole II 13 and an oil duct nozzle mounting hole 14.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in figures 1-7, the crankcase structure of the upper and lower combined box type engine for the motorcycle comprises an upper box body 1 and a lower box body 2 which are arranged oppositely up and down, and a crankshaft 3 arranged in the upper box body 1 and the lower box body 2, wherein a plurality of semicircular crankshaft seats 4 are oppositely arranged on the combined box surface of the upper box body 1 and the lower box body 2, the upper and lower opposite crankshaft seats 4 form a circular crankshaft hole 5, the crankshaft 3 is arranged in the crankshaft hole 5 through a bearing, and a semicircular thrust bearing 6 is arranged between a crank 32 of the crankshaft 3 and the side wall of the crankshaft seat 4 in the upper box body 1.
In order to fix the crankshaft 3, four crankshaft seats 4 are respectively arranged in the upper box body 1 and the lower box body 2.
In addition, a main shaft hole 7, an auxiliary shaft hole 8 and a balance shaft hole 9 are further formed in the box closing surface of the upper box body 1 and the lower box body 2, the whole assembly is convenient, whether parts are assembled in place or not can be conveniently checked, and misloading and neglected loading are avoided.
In order to facilitate the installation of the semicircular thrust bearing 6, thrust bearing installation surfaces 10 are arranged on the opposite side surfaces of the two crank seats 4 positioned in the middle in the upper box body 1.
Because the crankcase is assembled by adopting an upper and lower box-closing mode, the installation mode of the traditional thrust bearing 6 needs to respectively process the thrust bearing installation surfaces 10 on the side walls of the crankshaft 4 seats corresponding to the upper box body 1 and the lower box body 2, and semi-circular thrust bearings 6 need to be respectively assembled in the upper box body 1 and the lower box body 2 during the assembly, thereby forming a complete circular thrust bearing 6 structure and preventing the abrasion between the crankshaft 3 and the box bodies.
However, according to this kind of mode, not only increased the processing cost of footstep bearing installation face 10, the installation is also more loaded down with trivial details moreover, consequently the utility model discloses in only set up semicircular footstep bearing 6 in last box 1, process footstep bearing installation face 10 at the opposite flank of two bent axle seats 4 of last box 1 promptly, the relative position of box 2 then need not to process footstep bearing installation face 10 down, directly adopt down the blank original state of box 2 can to processing time and processing cost have been reduced, also correspondingly reduced the quantity and the time of footstep bearing 6 installation, machining efficiency has been improved.
The crankshaft 3 comprises a main journal I31 and two pairs of cranks 32 respectively arranged at two ends of the main journal I31, a main journal II 33 is arranged at the outer end of each crank 32, and the main journal I31 and the main journal II 33 are arranged on the crankshaft seat 4.
Specifically, two cranks 32 located on the same side of a main journal i 31 are connected through a connecting rod shaft diameter, the main journal i 31 is mounted on two crank bases 4 located in the middle, and the main journals ii 33 are respectively mounted on two crank bases 4 located on two sides.
To achieve power transmission, a sprocket 34 is mounted on the main journal i 31.
The sprocket is located the intermediate position of main journal I31, can balance the atress at 3 both ends of bent axle when power transmission, avoids appearing 3 both ends degree of wear inequality of bent axle and causes the problem of engine trouble.
In order to fix the crankshaft 3 on the crankshaft seat 4, mounting holes I11 are arranged at two ends of the crankshaft seat 4, and the corresponding crankshaft seats 4 on the upper box body 1 and the lower box body 2 are connected through bolts arranged in the mounting holes I11.
In order to increase the positioning accuracy when assembling the upper box body 1 and the lower box body 2, a positioning hole 12 is correspondingly arranged between the upper box body 1 and the lower box body 2.
Specifically, when the box closing is carried out, positioning pins can be arranged in the corresponding positioning holes 12 of the upper box body 1 and the lower box body 2 for positioning, and the precision of the box closing is ensured.
In order to realize the installation of the upper box body 1 and the lower box body 2, the upper box body 1 and the lower box body 2 are provided with installation holes II 13 for connecting the upper box body and the lower box body.
And a bolt is arranged in the mounting hole II 13, and the upper box body 1 and the lower box body 2 are fixed through the matching of the bolt and the nut.
The traditional crankcase assembled by the left and right cases has the advantages that the lubrication can only be designed at the joint surfaces of the left and right cases and the outer covers, the oil pressure in the oil duct is high, and the problem of oil leakage is often caused by the collision of the left and right cases after the machining quality. The utility model discloses an upper and lower mode of closing the case then can set up the oil duct inside the box, and upper and lower box assembly forms a whole, and the oil duct in upper box 1 and the lower box 2 forms a complete and communicating oil duct, can avoid appearing the condition of oil leak. In order to supply lubricating oil to each part in the box body, oil passage nozzle mounting holes 14 are respectively formed in the upper box body 1 and the lower box body 2.
In order to realize the inlet and outlet of lubricating oil in the oil duct, the bottom of the lower box body is provided with an oil inlet hole 15 and an oil outlet hole 16, and the oil inlet hole 15 is connected with an oil pump.
The utility model discloses a mode of upper and lower mould assembling is adopted to the crankcase, simple structure, and processing is convenient to can solve the condition of the oil duct oil leak that left and right mould assembling exists. When the interior of the engine is produced or maintained, parts such as the crankshaft, the balance shaft, the main shaft, the auxiliary shaft and the like can be maintained or replaced only by detaching the lower box body 2, the box does not need to be opened for maintenance, the maintenance is convenient and efficient, the vertical beam for replacing the sealing element is reduced, and the maintenance cost is reduced. Additionally, the utility model discloses only can realize the problem of wearing and tearing between bent axle 3 and the box through the semicircular footstep bearing 7 of installation in last box 1, reduce the step of box processing and footstep bearing 7's installation quantity, improve machining efficiency.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (9)
1. The upper and lower combined box type engine crankcase structure for the motorcycle is characterized by comprising an upper box body (1) and a lower box body (2) which are arranged in an upper-lower mode, and a crankshaft (3) installed in the upper box body (1) and the lower box body (2), wherein a plurality of semicircular crankshaft seats (4) are oppositely arranged on the combined box surfaces of the upper box body (1) and the lower box body (2), the upper and lower opposite crankshaft seats (4) form a circular crankshaft hole (5), the crankshaft (3) is installed in the crankshaft hole (5) through a bearing, and a semicircular thrust bearing (6) is arranged between a crank (32) of the crankshaft (3) and the side wall of the crankshaft seat (4) in the upper box body (1).
2. The upper and lower box-combined type engine crankcase structure for motorcycle according to claim 1, wherein four crank seats (4) are respectively provided in the upper box body (1) and the lower box body (2).
3. The upper and lower combiner box type engine crankcase structure for motorcycle according to claim 2, characterized in that the opposite sides of the two crank seats (4) located at the middle in the upper box body (1) are provided with thrust bearing mounting surfaces (10).
4. The crankcase structure of the upper and lower combined box type engine for motorcycle according to claim 1, wherein the crankshaft (3) comprises a main journal I (31) and two pairs of cranks (32) respectively arranged at two ends of the main journal I (31), the outer end of the crank (32) is provided with a main journal II (33), and the main journal I (31) and the main journal II (33) are arranged on the crankshaft seat (4).
5. The crankcase structure of upper and lower box-type engines for motorcycles as claimed in claim 4, wherein a sprocket (34) is mounted on said main journal i (31).
6. The upper and lower box-combined type engine crankcase structure for the motorcycle according to claim 1, wherein mounting holes I (11) are formed at two ends of the crankshaft seat (4), and the corresponding crankshaft seats (4) on the upper box body (1) and the lower box body (2) are connected through bolts arranged in the mounting holes I (11).
7. The crankcase structure of the upper and lower box-combined type engine for the motorcycle according to claim 1, wherein a positioning hole (12) is correspondingly arranged between the upper box body (1) and the lower box body (2).
8. The crankcase structure of upper and lower box-combined type engine for motorcycle according to claim 1, wherein the upper box body (1) and the lower box body (2) are provided with mounting holes II (13) for connecting the two.
9. The crankcase structure of upper and lower combined box type engine for motorcycle according to claim 1, wherein the upper box body (1) and the lower box body (2) are respectively provided with oil duct nozzle mounting holes (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495722.XU CN211500820U (en) | 2019-12-31 | 2019-12-31 | Upper and lower box-closing type engine crankcase structure for motorcycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495722.XU CN211500820U (en) | 2019-12-31 | 2019-12-31 | Upper and lower box-closing type engine crankcase structure for motorcycle |
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| Publication Number | Publication Date |
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| CN211500820U true CN211500820U (en) | 2020-09-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922495722.XU Active CN211500820U (en) | 2019-12-31 | 2019-12-31 | Upper and lower box-closing type engine crankcase structure for motorcycle |
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| CN (1) | CN211500820U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832920A (en) * | 2020-12-31 | 2021-05-25 | 浙江春风动力股份有限公司 | Engine crankcase and manufacturing method thereof |
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2019
- 2019-12-31 CN CN201922495722.XU patent/CN211500820U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112832920A (en) * | 2020-12-31 | 2021-05-25 | 浙江春风动力股份有限公司 | Engine crankcase and manufacturing method thereof |
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