CN202209221U - Left crank case body of motorcycle - Google Patents
Left crank case body of motorcycle Download PDFInfo
- Publication number
- CN202209221U CN202209221U CN2011203352837U CN201120335283U CN202209221U CN 202209221 U CN202209221 U CN 202209221U CN 2011203352837 U CN2011203352837 U CN 2011203352837U CN 201120335283 U CN201120335283 U CN 201120335283U CN 202209221 U CN202209221 U CN 202209221U
- Authority
- CN
- China
- Prior art keywords
- boss
- lug boss
- hole
- case body
- pedal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The utility model discloses a left crank case body of a motorcycle, which comprises a case body, wherein a starting shaft spacing hole convex pillar and a B side screw hole lug boss are formed on the inner wall of the case body, and are connected with each other; a starting shaft spacing hole is formed on the starting shaft spacing hole convex pillar; a B side screw hole is formed on the B side screw hole lug boss; a lug boss is arranged on the outer side wall of the case body; a pedal hole lug boss is formed on the inner side wall of the case body in a position opposite to the lug boss; a pedal hole is formed from the lug boss to the pedal hole lug boss; and clearances are formed between the pedal hole lug boss, the B side screw hole lug boss and the starting shaft spacing hole convex pillar. The utility model has the advantage that shrinkage holes cannot be formed in the pedal hole lug boss and the B side screw hole lug boss during the die casting of a left crank case body blank, so that defects of oil leakage and air leakage when the B side screw hole lug boss and the pedal hole lug boss are machined on the left crank case body blank can be avoided. Therefore, the defects of a left crank case body adopting the conventional structure can be overcome better; and the left crank case body provided by the utility model has a simple process, is easy to apply, and is suitable for large-scale popularization and application.
Description
Technical field
The utility model relates to a kind of motorcycle crankcase parts, relates in particular to the left crankcase of motorcycle.
Background technique
As shown in Figure 1; Traditional motorcycle left crankcase comprises body 1, on the inwall of this body, is provided with to start axle spacing hole projection 2 and B face screw boss 3; Wherein have a startup axle spacing hole 4 on the startup axle spacing hole projection 2, have B face screw 5 on the B face screw boss 3; On the outer side wall of said body 1, be provided with boss 6; Be provided with pedal hole boss 7 with these boss 6 relative body madial walls; Have pedal hole 8 in boss 6 upper edge side direction; The boss 7 to said pedal hole is opened in this pedal hole 8, and pedal hole boss 7 is connected as one with B face screw boss 3 threes with said startup axle spacing hole projection 2.
Generally produce motorcycle left crankcase blank at present through die casting; And pedal hole boss 7 is connected as one with B face screw boss 3 threes with said startup axle spacing hole projection 2; Make their entire area bigger like this; Very easily the inside of boss 7 and B face screw boss 3 forms shrinkage cavity in the pedal hole during die casting, and when machine added above-mentioned B face screw 5 with pedal hole 8 then, inner shrinkage cavity will come out; Thereby cause B face screw 5 and 8 leakage of oils of pedal hole, gas leakage, be badly in need of solving the problems of the technologies described above for this reason.
The model utility content
The utility model technical problem to be solved is to provide a kind of motorcycle left crankcase that can effectively avoid producing in inside shrinkage cavity.
The technological scheme of the utility model is following: a kind of motorcycle left crankcase; Comprise body (1); On the inwall of this body, be provided with and start axle spacing hole projection (2) and B face screw boss (3); Wherein start axle spacing hole projection (2) and link to each other, and have startup axle spacing hole (4) on the startup axle spacing hole projection (2), have B face screw (5) on the B face screw boss (3) with B face screw boss (3); On the outer side wall of said body (1), be provided with boss (6); Body (1) madial wall relative with this boss is provided with pedal hole boss (7); Side direction has pedal hole (8) in boss (6) upper edge; Open to said pedal hole boss (7) in this pedal hole, it is characterized in that: all have the gap between said pedal hole boss (7) and B face screw boss (3), the startup axle spacing hole projection (2).
The utility model makes between said pedal hole boss (7) and B face screw boss (3), the startup axle spacing hole projection (2) all to have the gap on the basis of conventional construction.Adopt above technological scheme; The pedal hole boss that the utility model will be connected as a single entity before will improving, startup axle spacing hole projection and B face screw boss are divided into two parts; Specifically a part is continuous startup axle spacing hole projection and B face screw boss, and another part is independent pedal hole boss, and this pedal hole boss all has the gap with startup axle spacing hole projection and B face screw boss; So just can effectively reduce the entire area of each part; Thereby the inside of pedal hole boss and B face screw boss forms shrinkage cavity when effectively avoiding die casting crankcase body blank, thereby prevents leakage of oil after machine on the blank adds B face screw and pedal hole, gas leakage, has overcome the defective of conventional construction preferably; Technology is simple, easy to implement, is suitable for the large-scale promotion utilization.
As optimization, said B face screw boss (3) is an arcuate segment near the position of pedal hole boss (7), and this arcuate segment is the center of circle with the center of said B face screw (5), and radius (R) is 5.5mm.
Beneficial effect: the inside of pedal hole boss and B face screw boss formed shrinkage cavity when the utility model can effectively be avoided die casting left crankcase blank; Thereby prevent after machine on the blank adds B face screw and pedal hole, to occur leakage of oil, gas leakage defective; Overcome the defective of conventional construction preferably; Technology is simple, easy to implement, is suitable for the large-scale promotion utilization.
Description of drawings
Fig. 1 is the partial schematic diagram of conventional construction;
Fig. 2 is the structural representation of the utility model;
Fig. 3 is the partial enlarged drawing of A part among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
Like Fig. 2, shown in 3; A kind of motorcycle left crankcase; Comprise body 1, a startup axle spacing hole projection 2 and a B face screw boss 3 are set on the inwall of this body 1, wherein start an axle spacing hole projection 2 and link to each other with B face screw boss 3; And have a startup axle spacing hole 4 on the startup axle spacing hole projection 2, have B face screw 5 on the B face screw boss 3.On the outer side wall of said body 1, be provided with boss 6, body 1 madial wall relative with this boss is provided with pedal hole boss 7, has pedal hole 8 in boss 6 upper edge side direction, and the boss 7 to said pedal hole is opened in this pedal hole 8.As the improvement of the utility model, all has the gap between said pedal hole boss 7 and B face screw boss 3, the startup axle spacing hole projection 2.The spacing C in gap is 1.8～2.2mm between said pedal hole boss 7 and the startup axle spacing hole projection 2.The spacing C in gap is 2mm between said pedal hole boss 7 and the startup axle spacing hole projection 2.Said B face screw boss 3 positions near pedal hole boss 7 are arcuate segment, and this arcuate segment is the center of circle with the center of said B face screw 5, and radius R is 5.5mm.
The above is merely the preferred embodiment of the utility model; It is not restriction with the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection domain of the utility model.
Claims (2)
1. motorcycle left crankcase; Comprise body (1); On the inwall of this body, be provided with and start axle spacing hole projection (2) and B face screw boss (3); Wherein start axle spacing hole projection (2) and link to each other, and have startup axle spacing hole (4) on the startup axle spacing hole projection (2), have B face screw (5) on the B face screw boss (3) with B face screw boss (3); On the outer side wall of said body (1), be provided with boss (6); Body (1) madial wall relative with this boss is provided with pedal hole boss (7); Side direction has pedal hole (8) in boss (6) upper edge; Open to said pedal hole boss (7) in this pedal hole, it is characterized in that: all have the gap between said pedal hole boss (7) and B face screw boss (3), the startup axle spacing hole projection (2).
2. motorcycle left crankcase according to claim 1 is characterized in that: said B face screw boss (3) is an arcuate segment near the position of pedal hole boss (7), and this arcuate segment is the center of circle with the center of said B face screw (5), and radius (R) is 5.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203352837U CN202209221U (en) | 2011-09-08 | 2011-09-08 | Left crank case body of motorcycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203352837U CN202209221U (en) | 2011-09-08 | 2011-09-08 | Left crank case body of motorcycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202209221U true CN202209221U (en) | 2012-05-02 |
Family
ID=45988772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203352837U Expired - Fee Related CN202209221U (en) | 2011-09-08 | 2011-09-08 | Left crank case body of motorcycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202209221U (en) |
-
2011
- 2011-09-08 CN CN2011203352837U patent/CN202209221U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120502 Termination date: 20170908 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |