CN203335265U - Left crank case of motorcycle engine - Google Patents
Left crank case of motorcycle engine Download PDFInfo
- Publication number
- CN203335265U CN203335265U CN2013203775934U CN201320377593U CN203335265U CN 203335265 U CN203335265 U CN 203335265U CN 2013203775934 U CN2013203775934 U CN 2013203775934U CN 201320377593 U CN201320377593 U CN 201320377593U CN 203335265 U CN203335265 U CN 203335265U
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- Prior art keywords
- oil
- gas separation
- mounting hole
- casing
- cavity
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Abstract
The utility model discloses a left crank case of a motorcycle engine. A crank installation hole (1) and a balance shaft installation hole (2) are formed in a case body, an isolation cavity semi-wrapping the left side of the balance shaft installation hole is formed in the inner side of the case body, and the isolation cavity stretches to the bottom of the case body from the top of the case body along the left side wall of the case body; partition plates (4) are arranged in the isolation cavity to partition the isolation cavity into an oil-gas separation front cavity (5), an oil-gas separation back cavity (6) and a return oil cavity (7) which are connected sequentially from top to bottom, an exhaust nozzle (8) communicated with the oil-gas separation back cavity is arranged on the top of the case body, a notch (4a) communicated with two adjacent cavities is formed in each partition plate, and a return oil opening (7a) is formed in the bottom of the return oil cavity; an eccentric distance e exists between the crank installation hole and a cylinder center line (9), and e > 0. The left crank case is matched with a right crank case arranged correspondingly, and solves the problems that pressure in the case body is overhigh when the engine works, oil-gas separation is not good, and piston side pressure is high.
Description
Technical field
The utility model relates to a kind of for the left crankcase structure on motor, belongs to the mechanical structure technical field.
Background technique
Left crankcase is one of requisite component on motor, and left crankcase and right crankcase are installed together the formation engine crankshaft box by the mould assembling bolt.Left crankcase is called inboard near a side of right crankcase, and a side of close left crankcase cover is called the outside.Be provided with crank mounting hole, trunnion shaft mounting hole etc. on left crankcase, usually, the trunnion shaft mounting hole site is in the upper left side of crank mounting hole.The subject matter existed is: often occur overpressure, unbalanced phenomenon in (1) casing, simultaneously, Oil-gas Separation is bad, causes the engine motor oil consumption large, and exhaust emission is large; (2) there is not eccentric structure in the relative cylinder centerline of crank mounting hole, causes side pressure of piston large, and engine reliability is low; (3) after left crankcase and right crankcase mould assembling, rigidity is inadequate, causes engine noise large.
The model utility content
After the utility model is intended to solve left crankcase and right crankcase mould assembling, during engine operation, the problem that the casing internal pressure is too high, Oil-gas Separation is bad and side pressure of piston is large.
For this reason, the technological scheme that the utility model adopts is: a kind of left crankcase of motorcycle engine, be provided with crank mounting hole (1) and trunnion shaft mounting hole (2) on casing, described trunnion shaft mounting hole (2) is positioned at the left side of crank mounting hole (1), bearing hole mold insert (3) is housed in crank mounting hole (1), key is: be provided with the separate cavities that partly wraps in trunnion shaft mounting hole (2) left side in the inboard of described casing, described separate cavities, from the top of casing, extends downwardly into bottom half along the left side wall of casing; Be provided with dividing plate (4) in described separate cavities, separate cavities is divided into from top to bottom to connected successively Oil-gas Separation ante-chamber (5), Oil-gas Separation back cavity (6) and oil back chamber (7), described casing top is provided with the exhaust nozzle (8) communicated with Oil-gas Separation back cavity (6), be provided with the breach (4a) that is communicated with adjacent two cavitys on each dividing plate (4), the bottom, right side of described oil back chamber (7) is provided with return opening (7a); Be provided with cylinder attachment face (13) at described casing top, between crank mounting hole (1) and cylinder centerline (9), have eccentric distance e, and e>0.
Set up Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber and exhaust nozzle on left crankcase.On right crankcase, correspondence is provided with Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber.Oil-gas Separation ante-chamber on left crankcase, Oil-gas Separation back cavity, oil back chamber are corresponding one by one with Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber position on right crankcase, and left and right crankcases snaps together and forms Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber totally three cavitys independently.Be provided with breach on the dividing plate of crankcase, make each independently cavity be interconnected again.Formed a complete respiratory system by inlet hole, Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber, exhaust nozzle, dividing plate between Oil-gas Separation ante-chamber and Oil-gas Separation back cavity plays the effect of Oil-gas Separation, gas after separation is discharged through exhaust nozzle, prevented the overpressure in crankcase body, machine oil after separation flows to oil back chamber through the Oil-gas Separation back cavity, the bottom, right side of oil back chamber is provided with return opening, flow in the oil sump in crankcase body by return opening, machine oil is carried out to recycling.Simultaneously, crank is designed to eccentric structure, to reduce the side pressure of piston, mentions the reliability of engine operation.
Except the periphery of casing is provided with outside mould assembling bolt hole (10), also be provided with interior mould assembling bolt hole (11) in casing, described interior mould assembling bolt hole (11) is arranged on the rib that casing extends internally.By increase interior mould assembling bolt around crankshaft cavity, thereby improve the rigidity of motor, reach the purpose that reduces engine noise.
Be preferably the eccentric distance e=3mm between described crank mounting hole (1) and cylinder centerline (9).
Further, described Oil-gas Separation ante-chamber (5) and Oil-gas Separation back cavity (6) are positioned at the top of trunnion shaft mounting hole (2), oil back chamber (7) is from the downside of Oil-gas Separation back cavity (6), left side wall along casing extends downwardly into bottom half, and described trunnion shaft mounting hole (2) is positioned on the same level line with the axis of crank mounting hole (1).Because Oil-gas Separation ante-chamber and Oil-gas Separation back cavity have taken the space of casing upper left quarter, therefore, the trunnion shaft mounting hole is moved down to layout, preferably and the crank mounting hole on the same level line.
The beneficial effects of the utility model:
(1) Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber and exhaust nozzle have been set up on left crankcase, Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber, inlet hole are set on right crankcase, left and right crankcases snaps together and forms a complete engine breathing system, avoided occurring in the casing phenomenon of overpressure, simultaneously, the energy separation oil and gas, the oil consumption of minimizing motor, reduce air pollution emission;
(2) there are eccentric distance in crank mounting hole and cylinder centerline, make the eccentric installation of crank, to reduce the side pressure of piston, improve engine reliability;
(3) by around crankshaft cavity, increasing interior mould assembling bolt, with outer mould assembling bolt, combine the rigidity that improves motor, reach the purpose that reduces engine noise.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model (from a side of right crankcase).
The rear view that Fig. 2 is Fig. 1.
The A-A sectional view that Fig. 3 is Fig. 1.
The B-B sectional view that Fig. 4 is Fig. 1.
The C-C sectional view that Fig. 5 is Fig. 1.
The D that Fig. 6 is Fig. 1 is to revolved view.
The structural representation that Fig. 7 is the right crankcase supporting with the utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail.
The left crankcase of motorcycle engine as shown in Figure 1, Figure 2, Figure 3 shows is provided with crank mounting hole 1 and trunnion shaft mounting hole 2 on casing.Trunnion shaft mounting hole 2 is positioned at the left side of crank mounting hole 1.Shown in Fig. 1, Fig. 4, bearing hole mold insert 3 is housed in crank mounting hole 1.Figure 1 shows that the inboard of left crankcase, i.e. a side of close right crankcase; Figure 2 shows that the outside of left crankcase, i.e. a side of close left crankcase cover.
Be provided with the separate cavities that partly wraps in trunnion shaft mounting hole 2 left sides in the inboard of casing.Separate cavities, from the top of casing, extends downwardly into bottom half along the left side wall of casing.For vacating space is arranged separate cavities, trunnion shaft mounting hole 2 relative conventional construction when arranging moves down.Be provided with two dividing plates 4 in separate cavities, separate cavities is divided into from top to bottom to connected successively Oil-gas Separation ante-chamber 5, Oil-gas Separation back cavity 6 and oil back chamber 7.The casing top is provided with the exhaust nozzle 8 communicated with Oil-gas Separation back cavity 6, is provided with the breach 4a that is communicated with adjacent two cavitys on each dividing plate 4, and the bottom, right side of oil back chamber 7 is provided with return opening 7a.Shown in Fig. 1, Fig. 6, also be provided with cylinder attachment face 13 on casing, there is eccentric distance e between crank mounting hole 1 and cylinder centerline 9, and e>0.Preferably, the eccentric distance e=3mm between crank mounting hole 1 and cylinder centerline 9.
In conjunction with Fig. 1, Fig. 2, except the periphery of casing is provided with outside several mould assembling bolts hole 10, also be provided with interior mould assembling bolt hole 11 in casing, interior mould assembling bolt hole 11 is arranged on the rib that casing extends internally.The quantity of interior mould assembling bolt hole 11 arranges as required, is preferably three, is looped around the distribution triangular in shape on every side of crankshaft cavity.As shown in Figure 5, be provided with oil leab 12 and plug 14 in casing.
Figure 7 shows that the right crankcase of setting corresponding to the utility model, on right crankcase, be provided with Oil-gas Separation ante-chamber 5 ', Oil-gas Separation back cavity 6 ' and oil back chamber 7 ' and inlet hole 15.Oil-gas Separation ante-chamber 5 ' corresponding with the Oil-gas Separation ante-chamber 5 on left crankcase, Oil-gas Separation back cavity 6 ' corresponding with the Oil-gas Separation back cavity 6 on left crankcase, oil back chamber 7 ' corresponding with the oil back chamber 7 on left crankcase.Adjacent cavity separates by dividing plate 4, Oil-gas Separation back cavity 6 ' and oil back chamber 7 ' between dividing plate on be provided with breach 4a '.
Left and right crankcases snaps together and forms Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber totally three cavitys independently.Formed a complete respiratory system by inlet hole, Oil-gas Separation ante-chamber, Oil-gas Separation back cavity, oil back chamber, exhaust nozzle, dividing plate between Oil-gas Separation ante-chamber and Oil-gas Separation back cavity plays the effect of Oil-gas Separation, gas after separation is discharged through exhaust nozzle, prevented the overpressure in crankcase body, machine oil after separation flows to oil back chamber through the Oil-gas Separation back cavity, by return opening, flows in the oil sump in crankcase body.Inlet hole is communicated with crankcase, and exhaust nozzle is communicated with atmosphere, and oil back chamber directly is communicated with oil sump and return opening is positioned at below the oil sump pasta, can effectively prevent that the oil gas in crankcase from reentering engine breathing system through return opening.
Claims (4)
1. the left crankcase of a motorcycle engine, be provided with crank mounting hole (1) and trunnion shaft mounting hole (2) on casing, described trunnion shaft mounting hole (2) is positioned at the left side of crank mounting hole (1), bearing hole mold insert (3) is housed in crank mounting hole (1), it is characterized in that: be provided with the separate cavities that partly wraps in trunnion shaft mounting hole (2) left side in the inboard of described casing, described separate cavities, from the top of casing, extends downwardly into bottom half along the left side wall of casing; Be provided with dividing plate (4) in described separate cavities, separate cavities is divided into from top to bottom to connected successively Oil-gas Separation ante-chamber (5), Oil-gas Separation back cavity (6) and oil back chamber (7), described casing top is provided with the exhaust nozzle (8) communicated with Oil-gas Separation back cavity (6), be provided with the breach (4a) that is communicated with adjacent two cavitys on each dividing plate (4), the bottom, right side of described oil back chamber (7) is provided with return opening (7a); Be provided with cylinder attachment face (13) at described casing top, between crank mounting hole (1) and cylinder centerline (9), have eccentric distance e, and e>0.
2. according to the left crankcase of motorcycle engine claimed in claim 1, it is characterized in that: except the periphery of casing is provided with outside mould assembling bolt hole (10), also be provided with interior mould assembling bolt hole (11) in casing, described interior mould assembling bolt hole (11) is arranged on the rib that casing extends internally.
3. according to the left crankcase of motorcycle engine claimed in claim 1, it is characterized in that: the eccentric distance e=3mm between described crank mounting hole (1) and cylinder centerline (9).
4. according to the left crankcase of claim 1 or 2 described motorcycle engine, it is characterized in that: described Oil-gas Separation ante-chamber (5) and Oil-gas Separation back cavity (6) are positioned at the top of trunnion shaft mounting hole (2), oil back chamber (7) is from the downside of Oil-gas Separation back cavity (6), left side wall along casing extends downwardly into bottom half, and described trunnion shaft mounting hole (2) is positioned on the same level line with the axis of crank mounting hole (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203775934U CN203335265U (en) | 2013-06-28 | 2013-06-28 | Left crank case of motorcycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203775934U CN203335265U (en) | 2013-06-28 | 2013-06-28 | Left crank case of motorcycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203335265U true CN203335265U (en) | 2013-12-11 |
Family
ID=49703942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203775934U Withdrawn - After Issue CN203335265U (en) | 2013-06-28 | 2013-06-28 | Left crank case of motorcycle engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203335265U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321771A (en) * | 2013-06-28 | 2013-09-25 | 力帆实业(集团)股份有限公司 | Left crankcase for engines |
| CN105221215A (en) * | 2015-11-17 | 2016-01-06 | 浙江钱江摩托股份有限公司 | Deaerator on a kind of engine case of motorcycle |
-
2013
- 2013-06-28 CN CN2013203775934U patent/CN203335265U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103321771A (en) * | 2013-06-28 | 2013-09-25 | 力帆实业(集团)股份有限公司 | Left crankcase for engines |
| CN105221215A (en) * | 2015-11-17 | 2016-01-06 | 浙江钱江摩托股份有限公司 | Deaerator on a kind of engine case of motorcycle |
| CN105221215B (en) * | 2015-11-17 | 2018-06-01 | 浙江钱江摩托股份有限公司 | A kind of gs-oil separator on engine case of motorcycle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131211 Effective date of abandoning: 20150701 |
|
| RGAV | Abandon patent right to avoid regrant |