CN201505962U

CN201505962U - Portable chain saw with short handles

Info

Publication number: CN201505962U
Application number: CN2009202269731U
Authority: CN
Inventors: 孙树科; 郭士银
Original assignee: LINYI SANHE YONGJIA POWER CO Ltd
Current assignee: SHANDONG YONGJIA POWER CO., LTD.
Priority date: 2009-09-24
Filing date: 2009-09-24
Publication date: 2010-06-16
Anticipated expiration: 2019-09-24

Abstract

The utility model discloses a portable chain saw with short handles, belongs to forestry machinery, and solves the defects of easy aging of a damping rubber of the chain saw, easy deformation of a spiral spring, small engine torque and power and high manufacturing cost in the prior art. The portable chain saw mainly comprises a machine frame combination; a power combination, a starter combination, a brake combination, a stop motion switch combination, a guide plate, a chain, a front handle and a rear handle are arranged on the machine frame combination; the power combination comprises a gasoline engine; a left damping spring and a right damping spring are arranged on the front handle; a damping spring for the rear handle is arranged on the rear handle; the gas inlet structure of the gasoline engine is a crank valve gas inlet structure; a gas inlet is formed on a crankcase; a convex plate is arranged in a position of a crankshaft chamber near to the gas inlet; and the left and the right damping springs and the damping spring for the rear handle form a plate spring combination. The portable chain saw with short handles is mainly used for forestry administrative department and wood processing enterprises and also can be used for other relevant industries.

Description

Portable short chain saw

Technical field

The utility model belongs to a kind of forestry machinery, specifically, relates in particular to a kind of portable short in chain saw.

Background technology

In lumbering work, often to use chain saw.There is following defective in chain saw on the market now:

1, shock mitigation system and air intake structure are to take following traditional form: rubber or helical spring damping are adopted in the damping position of front and back handgrip, with the vibrations that reduce to transmit from chain, guide plate and engine.These structures in the past exist that yielding rubber is aging easily, the defective of helical spring easy deformation, thereby have increased the danger that the operator is caused accidental bodily injury.

2, the air intake structure of engine section is divided into two kinds:

1. piston-valve induction: air inlet is located at above the cylinder body, in piston moves back and forth process, comes the opening and closing air inlet by piston, and gaseous mixture enters crankcase by the air inlet that is arranged on above the cylinder body.The shortcoming of this structure is: the pressure relative stability in the crankcase is poor, and the utilization rate of gaseous mixture is low, and under the situation of same displacement, engine torque is little, power is little.

2. reed valve induction: air inlet is arranged on the crankcase, in the process that piston moves back and forth, reed is along with the continuous opening and closing of the variation of crankcase pressure, mist is sucked crankcase, though this structure can increase the moment of torsion of engine, but complex structure, the manufacturing cost height, it is not accurate enough that air inlet is controlled constantly.

At present, also there is not a kind of even more ideal chain saw on the market.

Summary of the invention

The purpose of this utility model provides a kind ofly to be utilized flat spring combination damping and utilizes the portable short in chain saw of Crank valve air inlet, and chain saw yielding rubber of the prior art wears out easily to overcome, helical spring easy deformation, engine torque and power is little, cost of manufacture is high defective.

The utility model is realized by the following technical solutions: a kind of portable short chain saw, comprise that frame combination, frame combination are provided with power combination, starter combination, brake combination, shutdown switch combination, guide plate, chain, front handlebar and back handle; The power combination comprises that gasoline engine, front handlebar are provided with left damping spring and right damping spring, and back handle is provided with back handle damping spring; The air intake structure of described gasoline engine is the Crank valve air intake structure, and crankcase is provided with air inlet, and crankshaft room is provided with boss near the air inlet place.

Left damping spring on the described front handlebar, right damping spring and back handle damping spring are preferably the flat spring combination, and the flat spring combination comprises spring base, flat spring and connecting plate.

Compared with prior art, the beneficial effects of the utility model are:

A, when the operator uses chain saw, the vibrations that produced by sawing and engine running, through passing to forward and backward handgrip after the flat spring damping, can more effectively reduce the hand-transmitted vibration value of forward and backward handle, thereby alleviate operator's sense of fatigue, make the operation chain saw that it can be lighter, more comfortable.

B, use the chain saw of flat spring combination damping, the life-span of spring is more permanent, can effectively avoid because of the harm to the person of aging or chain saw that inefficacy causes.

The chain saw of c, use flat spring combination vibration damping, it is more attractive in appearance that bulk shape seems, improved the class of product.

D, gasoline engine adopt the Crank valve air intake structure, utilize the rotation air inlet of crank, make crankcase air pressure more stable, and it is more abundant that gaseous mixture enters, the utilization rate height, and power and moment of torsion are bigger; Can make more accurate that the air inlet of gaseous mixture controls constantly, thereby effectively improve the performance of gasoline engine; Use the Crank valve air inlet, compare with the structure of piston-valve induction, bigger with power and moment of torsion under the situation of discharge capacity; Compare with the structure of reed valve induction, simple in structure, cost is low, reliability is high.

Description of drawings

Fig. 1 is a front view of the present utility model;

Fig. 2 is a vertical view of the present utility model;

Fig. 3 is a left view of the present utility model;

Fig. 4 is a rearview of the present utility model;

Fig. 5 is crankcase intake and crankshaft room's structural representation of gasoline engine of the present utility model;

Fig. 6 is the Crank valve fundamental diagram of gasoline engine of the present utility model;

Fig. 7 is the perspective exploded view of flat spring combination of the present utility model.

The specific embodiment

The utility model is described in further detail below in conjunction with accompanying drawing.

In the accompanying drawing: 1, power combination; 2, felling dog; 3, brake handle is nested; 4, guard shield combination; 5, front handlebar; 6, back handle; 7, front handlebar joint pin; 8, starter combination; 9, fixed screw; 10, brake combination; 11, left damping spring; 14, throttle push rod; 15, shutdown switch combination; 16, back handle damping spring; 19, guide plate; 20, chain; 21, carrier bar guard shield; 22, right damping spring; 51, air inlet; 52, crankshaft room; 53, boss; 61, crank; 62, crankcase; 71, spring base; 72, flat spring; 73, connecting plate.

In the utility model, the structure of flat spring combination comprises three parts altogether: spring base 71, flat spring 72 and connecting plate 73, assemble method are after the flat spring 72 of annular is put into spring base 71, connecting plate 73 sides placed on it, with the end sealing of spring base, form a whole then.

Its operation principle is: plate spring groups is combined in and has three places on the described chain saw, the flat spring combination links to each other remote holder to 5 to 6 with defensive position respectively with power combination 1, power makes up 1 running and sawing operation because of engine and produces vibrations when chain saw is worked, and can reduce greatly after the vibrations process flat spring damping that the operator experiences when gripping front handlebar 5, back handle 6.

The structure at crankcase air inlet position has increased a boss 53 at crankshaft room 52 places near air inlet 51 as shown in Figure 5, and boss surface needs fine finishining to satisfy the needs of Crank valve air inlet; The counterweight of crank 61 strengthens, and cambered surface is carried out fine finishining to foreign round, to use as valve.The operation principle of Crank valve air inlet is: as shown in Figure 6, when the crank 61 of engine counterclockwise rotates by the diagram arrow, when the A of crank 61 point rotated to the C point at crankcase 62 air inlets 51 positions, air inlet 51 was opened, and gaseous mixture enters crankshaft room 52 through air inlet 51; Crank 61 continues rotation, and when the B of crank 61 point rotated to the D point at crankcase 62 air inlets 51 positions, inlet close, engine were finished intake process one time.

Claims

1. one kind portable short, comprise that frame combination, frame combination are provided with power combination, starter combination, brake combination, shutdown switch combination, guide plate, chain, front handlebar and back handle chain saw; The power combination comprises that gasoline engine, front handlebar are provided with left damping spring and right damping spring, and back handle is provided with back handle damping spring; It is characterized in that: the air intake structure of described gasoline engine is the Crank valve air intake structure, and crankcase is provided with air inlet, and crankshaft room is provided with boss near the air inlet place.

2. according to claim 1 portable short in chain saw, it is characterized in that: the left damping spring on the described front handlebar, right damping spring and back handle damping spring are the flat spring combination, and the flat spring combination comprises spring base, flat spring and connecting plate.