CN102121430B

CN102121430B - Left crankcase body of motorcycle engine

Info

Publication number: CN102121430B
Application number: CN2011100789466A
Authority: CN
Inventors: 田亚平
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2011-03-31
Filing date: 2011-03-31
Publication date: 2012-07-04
Anticipated expiration: 2031-03-31
Also published as: CN102121430A

Abstract

The invention discloses a left crankcase body of a motorcycle engine. The left crankcase body comprises a left crankcase main body with a crankshaft hole, wherein the front end of the left crankcase main body is provided with an upper hanging hole and a lower hanging hole; a first boss is arranged between the upper hanging hole and the lower hanging hole; the height of the first boss is between 43.5 millimeters and 47.5 millimeters; the diameter of an inner hole of the first boss is between 36 millimeters and 38 millimeters; the depth of the inner hole of the first boss is between 37 millimeters and 40 millimeters; the center of the crankshaft hole is taken as the original point of rectangular coordinates; the position coordinates of the first boss are that: X is equal to 64 to 67 and Y is equal to -18 to -21; the periphery of the first boss is provided with a second boss; and the height of the second boss is between 38 millimeters and 42 millimeters. The left crankcase body can be manufactured by die repairing on the basis of the original structure without die sinking, has small reformation and low reformation cost, is easy to reform, does not need to change the assembling position of the crankcase on an entire motorcycle, and has the characteristics of simple structure, easiness in implementing, high generality and the like.

Description

The motorcycle engine left crankcase

Technical field

The invention belongs to the motorcycle engine technical field, specifically, the particularly left crankcase of motorcycle engine.

Background technique

In order to solve the big difficult problem of motorcycle engine vibration; The reciprocal inertia force that produces in the time of generally need on motorcycle engine, adopting balanced controls to come the running of balanced crank linkage mechanism; To reduce the influence of engine luggine, ensure the travelling comfort of driving to Finished Motorcycle of motorcycle.At present, on the motor that does not have trunnion shaft originally, increase balanced controls, conventional way is to design crankcase body and case lid again; Adjust crankcase simultaneously and on vehicle frame, mount the position; So not only transform complicacy, and need die sinking again, the cost of transformation is quite big.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of transformation to be easy to the motorcycle engine left crankcase.

Technological scheme of the present invention is following: a kind of motorcycle engine left crankcase; Left crankcase body (1) with band crankshaft hole (1b); A side of this left crankcase body (1) is mould assembling face (1a); Top at left crankcase body (1) front end has on-hook hole (2), and below of on-hook hole (2) is provided with first pilot hole (3) on this, and the back upper place in last on-hook hole (2) is provided with second pilot hole (4); Have on-hook hole (5) down in the bottom of said left crankcase body (1) front end; The rear in this time on-hook hole (5) is provided with the 3rd pilot hole (6); Its key is: be provided with first boss (7) between on-hook hole (2) and the following on-hook hole (3) on said, this first boss (7) is positioned at the rear side of on-hook hole (2) and following on-hook hole (3) line of centres, and said first boss (7) is a circle; The height (H7) of first boss (7) is 43.5～47.5mm; The diameter (D7) of the endoporus of first boss (7) is 36～38mm, and the degree of depth (L7) of the endoporus of first boss (7) is 37～40mm, is the right angled coordinates initial point with the center of crankshaft hole (1b); The position coordinate of said first boss (7) is X=64～67, Y=-18～-21; Be provided with second boss (8) in the periphery of said first boss (7), the height (H8) of this second boss (8) is 38～42mm.

The present invention is on the basis of conventional construction; Between on-hook hole on the left crankcase body and following on-hook hole, two boss are set; The endoporus of this boss is communicated with the inner chamber of left crankcase body, and the inside of boss is as the space of ccontaining balanced controls, and right crankcase is done adaptation like this; After the crankcase body mould assembling of the left and right sides, the pairing inner space of boss promptly can be used for installing balanced controls.The present invention just can realize through repairing a die on the basis of original crankcase body, and need not change the structure of crankcase cover, not only changes for a short time, and transforms easily, and reforming cost is lower.

The said position coordinate of going up on-hook hole (2) is X=93～97, Y=30～34; The position coordinate of said first pilot hole (3) is X=100～104, Y=8～12; The position coordinate of said second pilot hole (4) is X=58～61, Y=61～64; The said position coordinate in on-hook hole (5) down is X=71～74, Y=-77～-80; The position coordinate of said the 3rd pilot hole (6) is X=48～52, Y=-78～-82.The present invention is through the position in each hole of adjustment; Helping mould assembling on the one hand fixes; On the other hand, the crankcase after the improvement is mounted on the original rigging position of Finished Motorcycle of motorcycle easily, has saved the trouble of on frame of motorcycle, changing the motor rigging position.

Be provided with the 4th pilot hole (9) in the said front upper place in on-hook hole (5) down, the position coordinate of the 4th pilot hole (9) is X=90～94, Y=-55～-59.Increasing a pilot hole up and down between the on-hook hole, can further strengthen the fixing that the left crankcase body is connected with right crankcase, and can prevent leakage of oil.

Beneficial effect: the present invention can be without die sinking; On the basis of original structure, just can accomplish through repairing a die, not only change little, transform easily, reforming cost is low, and needn't change the rigging position of crankcase on Finished Motorcycle of motorcycle; Have simple in structure, characteristics such as enforcement is easy, highly versatile; Can be used for transforming the motorcycle engine of 5 discharge capacities such as 125ml, 150 ml, 158 ml, 175 ml, 200 ml, enable to increase balanced controls, so that improve the travelling comfort of driving.

Description of drawings

Fig. 1 is a structural representation of the present invention.

Fig. 2 is the rear view of Fig. 1.

Fig. 3 is the B-B sectional view of Fig. 2.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is described further:

Like Fig. 1, Fig. 2, shown in Figure 3, the present invention has left crankcase body 1, and this left crankcase body 1 one of them side is uncovered structure, and this side is mould assembling face 1a, on another side of left crankcase body 1, has crankshaft hole 1b.The top of said left crankcase body 1 front end is provided with on-hook hole 2, is the right angled coordinates initial point with the center of crankshaft hole 1b, and the position coordinate in last on-hook hole 2 is X=93～97, Y=30～34.Have on-hook hole 5 down in the bottom of said left crankcase body 1 front end, the position coordinate in this time on-hook hole 5 is X=71～74, Y=-77～-80.Between last on-hook hole 2 and following on-hook hole 3, be provided with first boss 7; This first boss 7 is positioned at the rear side of the on-hook hole 2 and following on-hook hole 3 lines of centres; The position coordinate of first boss 7 is X=64～67, Y=-18～-21, the intracavity inter-connection of the endoporus of first boss 7 and left crankcase body 1.Said first boss 7 is circular, is reference level with mould assembling face 1a, and the height H 7 of first boss 7 is 43.5～47.5mm, and the diameter D7 of the endoporus of first boss 7 is 36～38mm, and the degree of depth L7 of the endoporus of first boss 7 is 37～40mm.Be provided with second boss 8 in the periphery of said first boss 7, the height H 8 of this second boss 8 is 38～42mm.

Can know that from Fig. 1, Fig. 2, Fig. 3 the position coordinate that below last on-hook hole 2, is provided with first pilot hole, 3, the first pilot holes 3 is X=100～104, Y=8～12.The back upper place in last on-hook hole 2 is provided with second pilot hole 4, and the position coordinate of this second pilot hole 4 is X=58～61, Y=61～64.The position coordinate that is provided with the 3rd pilot hole 6, the three pilot holes 6 at the said rear in on-hook hole 5 down is X=48～52, Y=-78～-82.The position coordinate that is provided with the 4th pilot hole 9, the four pilot holes 9 in the front upper place in following on-hook hole 5 is X=90～94, Y=-55～-59.On the wall of said first boss, 7 endoporus, have oilhole 10, the periphery of this oilhole 10 is provided with block 11, and said block 11 is a circular arc, and radius is 5～9mm, and the height of block 11 is 16～20mm.All the other structures of the present invention are identical with existing technology, do not do at this and give unnecessary details.

Claims

1. motorcycle engine left crankcase; Left crankcase body (1) with band crankshaft hole (1b); A side of this left crankcase body (1) is mould assembling face (1a); Top at left crankcase body (1) front end has on-hook hole (2), and below of on-hook hole (2) is provided with first pilot hole (3) on this, and the back upper place in last on-hook hole (2) is provided with second pilot hole (4); Have on-hook hole (5) down in the bottom of said left crankcase body (1) front end; The rear in this time on-hook hole (5) is provided with the 3rd pilot hole (6); It is characterized in that: be provided with first boss (7) between on-hook hole (2) and the following on-hook hole (5) on said, this first boss (7) is positioned at the rear side of on-hook hole (2) and following on-hook hole (3) line of centres, and said first boss (7) is a circle; The height (H7) of first boss (7) is 43.5～47.5mm; The diameter (D7) of the endoporus of first boss (7) is 36～38mm, and the degree of depth (L7) of the endoporus of first boss (7) is 37～40mm, is the right angled coordinates initial point with the center of crankshaft hole (1b); The position coordinate of said first boss (7) is X=64～67 mm, Y=-18～-21 mm; Be provided with second boss (8) in the periphery of said first boss (7), the height (H8) of this second boss (8) is 38～42mm.

2. motorcycle engine left crankcase according to claim 1 is characterized in that:

The said position coordinate of going up on-hook hole (2) is X=93～97 mm, Y=30～34 mm;

The position coordinate of said first pilot hole (3) is X=100～104 mm, Y=8～12 mm;

The position coordinate of said second pilot hole (4) is X=58～61 mm, Y=61～64 mm;

The said position coordinate in on-hook hole (5) down is X=71～74 mm, Y=-77～-80 mm;

The position coordinate of said the 3rd pilot hole (6) is X=48～52 mm, Y=-78～-82 mm.

3. motorcycle engine left crankcase according to claim 1 is characterized in that: be provided with the 4th pilot hole (9) in the said front upper place in on-hook hole (5) down, the position coordinate of the 4th pilot hole (9) is X=90～94 mm, Y=-55～-59 mm.