CN201074638Y

CN201074638Y - General purpose petrol engine crankshaft

Info

Publication number: CN201074638Y
Application number: CNU2007201249568U
Authority: CN
Inventors: 任健; 吴喆
Original assignee: Lifan Industry Group Co Ltd
Current assignee: Lifan Technology Group Co Ltd
Priority date: 2007-08-10
Filing date: 2007-08-10
Publication date: 2008-06-18
Anticipated expiration: 2017-08-10

Abstract

The utility model discloses a bent shaft for a general purpose petrol engine, wherein the two ends of a crank-pin (3) are respectively connected with the inner end face of an input end crank (2) and an output end crank (4), the center of the crank-pin (3) is provided with a cavity (6), the position on the circumferential face of the crank-pin (3) is provided with an oil outlet (7) toward the center, and the oil outlet (7) is communicated with the cavity (6). An oil inlet (8) is arranged on the output end crank (4) toward the direction of the crank-pin (3), and the oil inlet (8) is communicated with the cavity (6). The utility model can keep excellent lubrication of the contact faces between the crank-pin and a connecting lever, which effectively prevents locking and tensile failure of the connecting rod, prevents breaking of the box body of a crank case, guarantees normal working of a petrol engine, greatly prolongs the life spans of the connecting lever and the crank case, and has the advantages of simple structure, easy process, and low cost and the like.

Description

The all-purpose gasoline machine crankshaft

Technical field

The utility model relates to a kind of gasoline engine part, especially the all-purpose gasoline machine crankshaft.

Background technique

At present, the structure of vertical shaft all-purpose gasoline machine crankshaft as shown in Figure 3, form by input end main journal 1, input end crank 2, crank pin 3, output terminal crank 4 and output terminal main journal 5, the two ends of crank pin 3 are connected with the interior edge face of input end crank 2 with output terminal crank 4 respectively, its shaft axis is processed with a main oil gallery 9 in output terminal main journal 5 upper edges, the middle part of output terminal main journal 5 upwards offers oil input channel 10, oil input channel 10 and main oil gallery 9 vertical communicating from the footpath; On crank pin 3 and output terminal crank 4, be processed with

oblique oil ducts

11,12 butt joints of

oblique oil duct

11,12, two of coaxial inner conductor respectively and be communicated with main oil gallery 9.When machine oil is pressed into oil input channel 10 on the output terminal main journal 5 by oil pump, is pressed into oblique oil duct 11 on the crank pin 3 again by main oil gallery 9 afterwards, thereby makes oil lubricating crank pin 3 and connnecting rod big end.Because the oil channel structure complexity on output terminal main journal 5, output terminal crank 4 and the crank pin 3, processing difficulties causes the cost of bent axle to raise.In addition, the diameter of gasoline engine crank output terminal main journal 5 is less, and for proof strength, oil input channel 10 on the output terminal main journal 5 and main oil gallery 9 diameters can only further diminish, so not only cause processing difficulty more, up-to-standard rate is low, and oil duct results in blockage after attenuating easily, makes insufficient lubrication between crank pin 3 and the connecting rod, the easy locking of connecting rod in working long hours, and then connecting rod broken, and crankcase body is broken, and makes the petrol engine cisco unity malfunction.

The model utility content

Technical problem to be solved in the utility model is to provide a kind of and processes simply, can guarantee lubricated good all-purpose gasoline machine crankshaft between crank pin and the connecting rod.

The technical solution of the utility model is as follows: a kind of all-purpose gasoline machine crankshaft, comprise input end main journal, input end crank, crank pin, output terminal crank and output terminal main journal, wherein the two ends of crank pin are connected with the interior edge face of input end crank with the output terminal crank respectively, its key is: the center at described crank pin is provided with cavity, offer oil outlet towards its center on the circumferential surface of crank pin, this oil outlet communicates with described cavity; Offer oil inlet hole towards the crank pin direction on described output terminal crank, this oil inlet hole is communicated with described cavity.

Adopt above technological scheme, the oil nozzle of oil pump is installed in the position of oil inlet hole on the output terminal crank, when engine running, bent axle rotates, oil pump continues oil spout by oil nozzle, when bent axle turns to oil inlet hole on the output terminal crank over against oil nozzle at every turn, just having part machine oil sprays in the oil inlet hole, machine oil enters in the cavity in the crank pin by oil inlet hole, machine oil is stored in the crank pin cavity under action of centrifugal force, and enter gap between crank pin and the connnecting rod big end by oil outlet, form oil film, thereby the surface of contact between crank pin and the connecting rod is lubricated, to reduce friction, prevent the connecting rod locking, guarantee that motor can proper functioning.Compare with background technique, the oil inlet hole on the bent axle is changed on the present output terminal crank from the original output terminal main journal that is positioned at, and not only structure is simple more, processing is more convenient, and has effectively ensured the intensity of output terminal main journal.

For the ease of processing, the cavity in the above-mentioned crank pin is a circular hole, and the shaft axis of this circular hole overlaps with the shaft axis of described crank pin.

For ease of processing, and further improve lubrication effect between crank pin and the connecting rod, the oil outlet on the above-mentioned crank pin also is a circular hole, and oil outlet communicates with described cavity is vertical.

In order to ensure that machine oil can more successfully enter in the crank pin cavity, the shaft axis of above-mentioned oil inlet hole and the shaft axis of described cavity point-blank, the diameter of oil inlet hole and the equal diameters of cavity.

Beneficial effect: the utility model can make the surface of contact between crank pin and the connecting rod lubricated good, effectively prevented the connecting rod locking, broken and crankcase body is broken, guaranteed the proper functioning of petrol engine, prolong the working life of connecting rod and crankcase greatly, had characteristics such as simple in structure, easy processing, cost be lower.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is a user mode reference drawing of the present utility model.

Fig. 3 is the structural representation of background technique.

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

As shown in Figure 1, bent axle in the utility model is an overall structure, form by input end main journal 1, input end crank 2, crank pin 3, output terminal crank 4 and output terminal main journal 5, wherein input end crank 2 and output terminal crank 4 lay respectively at the inner of input end main journal 1 and output terminal main journal 5, and the two ends of crank pin 3 link to each other with the interior edge face of input end crank 2 with output terminal crank 4 respectively.Be provided with cavity 6 at the center of crank pin 3, cavity 6 is a circular hole, and the shaft axis of this circular hole overlaps with the shaft axis of described crank pin 3.Offer oil outlet 7 towards its center on the circumferential surface of crank pin 3, this oil outlet 7 also is a circular hole, oil outlet 7 and described cavity 6 vertical communicating.Oil inlet hole 8 is offered at position corresponding with crank pin 3 on output terminal crank 4, the shaft axis of the shaft axis of oil inlet hole 8 and cavity 6 point-blank, one of oil inlet hole 8 is docked and connected with cavity 6, the other end connects to the exterior edge face of output terminal crank 4, and the equal diameters of the diameter of oil inlet hole 8 and cavity 6.

As shown in Figure 2, kink has bottom 13 on output terminal main journal 5, this bottom 13 is fixed on the crankcase body, the oil nozzle 14 of internal or external formula oil pump is installed on the bottom 13, the position of the outlet of oil nozzle 14 oil inlet hole 8 on the output terminal crank 4, when engine running, bent axle rotates, oil pump continues oil spout by oil nozzle 14, when bent axle turns to oil inlet hole 8 on the output terminal crank over against oil nozzle 14 at every turn, just having part machine oil sprays in the oil inlet hole 8, machine oil enters in the cavity 6 in the crank pin 3 by oil inlet hole 8, and machine oil is stored in the crank pin cavity 6 under action of centrifugal force, and enters gap between crank pin 3 and connecting rod 15 major parts by oil outlet 7, form oil film, thereby the surface of contact between crank pin 3 and the connecting rod 15 is lubricated.

The processing of oil inlet hole 8, cavity 6 and oil outlet 7 is very simple in the utility model, shaft axis along crank pin 3 gets out a blind hole over against the exterior edge face of crank pin 3 at output terminal crank 4 with drilling tool, the part that this blind hole is positioned at output terminal crank 4 is an oil inlet hole 8, and the part that is positioned at crank pin 3 is a cavity 6; At the circumferential surface upper edge of crank pin 3 radial bore, can form oilhole 7 again.Compare with background technique, the oilhole on the utility model bent axle is simple in structure, and is easy to process, thereby greatly reduces the cost of production of bent axle.

Claims

1. all-purpose gasoline machine crankshaft, comprise input end main journal (1), input end crank (2), crank pin (3), output terminal crank (4) and output terminal main journal (5), wherein the two ends of crank pin (3) are connected with the interior edge face of input end crank (2) with output terminal crank (4) respectively, it is characterized in that: be provided with cavity (6) at the center of described crank pin (3), offer oil outlet (7) towards its center on the circumferential surface of crank pin (3), this oil outlet (7) communicates with described cavity (6); Upward offer oil inlet hole (8) towards crank pin (3) direction at described output terminal crank (4), this oil inlet hole (8) is communicated with described cavity (6).

2. all-purpose gasoline machine crankshaft according to claim 1 is characterized in that: the cavity (6) in the described crank pin (3) is a circular hole, and the shaft axis of this circular hole overlaps with the shaft axis of described crank pin (3).

3. all-purpose gasoline machine crankshaft according to claim 2 is characterized in that: the oil outlet (7) on the described crank pin (3) also is circular hole, oil outlet (7) and vertical the communicating of described cavity (6).

4. all-purpose gasoline machine crankshaft according to claim 2 is characterized in that: the shaft axis of the shaft axis of described oil inlet hole (8) and described cavity (6) point-blank, the equal diameters of the diameter of oil inlet hole (8) and cavity (6).