CN202356730U

CN202356730U - Mechanical brake structure of chain saw

Info

Publication number: CN202356730U
Application number: CN2011204100227U
Authority: CN
Inventors: 刘卫
Original assignee: Zhejiang YAT Electrical Appliance Co Ltd
Current assignee: Zhejiang YAT Electrical Appliance Co Ltd
Priority date: 2011-10-25
Filing date: 2011-10-25
Publication date: 2012-08-01
Anticipated expiration: 2021-10-25

Abstract

The utility model discloses a mechanical brake structure of a chain saw, comprising a gear box, wherein the gear box is internally provided with an output shaft; the output shaft is provided with an output gear; the brake structure further comprises a braking torsion spring; one part of the braking torsion spring is tightly matched with the output gear, and the other part of the braking torsion spring is tightly matched with the output shaft; a motor transmits to pass through the output gear and then is connected with the output shaft through the braking torsion spring in a transmission manner; the side part of the gear box is rotatably connected with a brake separation blade through a positioning pin; the back end of the brake separation blade acts with a protection plate; the protection plate rotates to drive the brake separation blade to rotate to enable the front end of the brake separation blade and the braking torsion spring to act to brake or separate the braking torsion spring; and the positioning pin is sleeved with one braking torsion spring to automatically recover the original position after the braking of the brake separation blade. Compared with the chain saw with a mechanical brake in the market, under the condition of having one braking torsion spring, only one brake block, one braking torsion spring and one positioning pin need to be additionally arranged, so as to realize a braking function; and therefore, the cost is greatly reduced.

Description

Chain saw machinery brake structure

Technical field

The utility model relates to a kind of chain saw machinery brake structure.

Background technology

Have on the existing market that the chain saw of mechanical brake is most of to adopt the torsion spring brake, can brake meeting in the time of safety for making chain saw, the braking mechanism that is adopted is all complicated.Chain saw is in running, and output shaft drives saw chain high-speed cutting together, during brake; Brake part need bear huge impact power, is being that the torsion spring head is very big to the impact of block in the torsion spring brake especially; So require the designer, it is strong that the block structural design is got ten minutes, and it is complicated that mechanism also becomes relatively; This chain saw that reaches more than the 6000RPM for output speed is very necessary; But for the chain saw of the low output speed of small-power, it is too heavy that strong like this block structure just seems, cost is also relatively very high.Thus, a kind of brake structure that is applied on the low speed output chain saw of design just very is necessary.The patent No. is that 200920151335.8 Chinese utility model (publication number 201389879, open day on January 27th, 2010) discloses a kind of improved electric chain saw brake gear, and it includes brake structure and clutch structure; Wherein, Clutch structure includes gear wheel and the torsion spring between output shaft and gear wheel that is installed on the output shaft of gear-box, and the brake lever that can slide up and down is installed in the brake structure, and described clutch structure also includes a brake clutch cover; This brake clutch cover is installed on the gear wheel; Torsion spring is fixed on output shaft, and its free end cooperates with brake clutch cover inner ring, and the outer ring of brake clutch cover then cooperates with the brake lever lower end.The complex structure but it still seems, cost is higher.

The utility model content

The utility model technical problem to be solved just provides a kind of chain saw machinery brake structure, and promptly at enough power with under running time, the mechanical brake time can meet the safety requirement, and is simple in structure, and cost is low.

For solving the problems of the technologies described above, the utility model adopts following technical scheme: chain saw machinery brake structure comprises gear-box; Be provided with output shaft in the gear-box; Establish output gear on the output shaft, it is characterized in that: brake structure also comprises a Brake torsion spring, and said Brake torsion spring partly is tight with on the output gear; Brake torsion spring another part is tight with on the output shaft; Drive of motor through behind the output gear again through the Brake torsion spring transmission output shaft, said gear-box sidepiece is through the alignment pin brake catch that is rotationally connected, a brake catch rear end and a protective plate effect; Protective plate rotates the rotation of drive brake catch makes brake catch front end and Brake torsion spring effect braking perhaps break away from Brake torsion spring, and socket one brake torsion spring is realized braking and automatically replied original position after catch is braked on the said alignment pin.

As preferably, said brake catch is L shaped, and L shaped corner is rotationally connected with on the gear-box through alignment pin.

As preferably; Socket one brake torsion spring on the said alignment pin, the brake washer is positioned at the gear-box homonymy with the brake torsion spring, and said L shaped brake catch base is provided with a draw-in groove; The pothook of brake torsion spring one end snaps in the draw-in groove, and the brake torsion spring other end leans the side of L shaped brake washer.

As preferably, chela was stirred the motion of brake washer before said protective plate bottom was provided with.

As preferably; Said protective plate bottom is provided with the back chela at preceding chela rear side, and preceding chela is located in the jaw groove with the jaw groove that the back chela surrounds, the catch rear end of braking; The side of said back chela is provided with a controller; Chela was pinned gauge tap after protective plate was pulled then backward, and motor is in opening, and chela and gauge tap were thrown off the power supply that breaks off motor in advance after protective plate was pulled then backward.

As preferably, said brake catch rear end is provided with the bottom effect of the protruding and preceding chela of a circular arc, and brake catch front end is provided with the plain hook portion with the Brake torsion spring effect.

As preferably, said protective plate is a lever construction, and balance pivot is near chela rear portion, back.

As preferably, said output gear is provided with a tubular protuberance, and a Brake torsion spring part is located on the tubular protuberance, is provided with axle sleeve between tubular protuberance and Brake torsion spring.

The utility model Brake torsion spring partly is tight with on the output gear, and another part is tight with on the output shaft, and drive of motor is through behind the gear; Through the Brake torsion spring transmission output shaft, brake washer and Brake torsion spring are positioned at the gear-box homonymy, and the brake washer is positioned on the gear-box through alignment pin and spacing hole; It is used that brake washer one end is used for Brake torsion spring; The other end is used for the operation with protective plate, through stirring of protective plate, and the motion of brake washer; The transmission of brake washer through Brake torsion spring, thus reach the purpose of brake.With respect to the chain saw that has mechanical brake on the market; Under the situation that a Brake torsion spring is arranged equally; The utility model only need increase brake block brake torsion spring and an alignment pin, can accomplish the function of brake, therefore greatly reduces cost.

Description of drawings

Below in conjunction with the accompanying drawing and the specific embodiment the utility model is further described:

Fig. 1 is the assembling sketch map of the utility model chain saw braking mechanism;

The sketch map of braking mechanism when Fig. 2 works for the utility model chain saw;

The sketch map of braking mechanism when Fig. 3 brakes for the utility model chain saw.

The specific embodiment

To shown in Figure 3, the embodiment for the utility model chain saw machinery brake structure comprises gear-box 10 like Fig. 1; Be provided with output shaft 6 in the gear-box, establish output gear 9 on the output shaft, brake structure also comprises a Brake torsion spring 7; Said Brake torsion spring partly is tight with on the output gear; Brake torsion spring another part is tight with on the output shaft, drive of motor through behind the output gear again through the Brake torsion spring transmission output shaft, the said gear-box sidepiece brake catch 5 that is rotationally connected; Brake catch rear end and a protective plate 1 effect, protective plate are rotated and are driven the brake catch and rotate and brake catch front end and Brake torsion spring effect are braked perhaps break away from Brake torsion spring.Said brake catch is L shaped, and L shaped corner is rotationally connected with on the gear-box through alignment pin 3.Socket one brake torsion spring 2 on the said alignment pin; The brake washer is positioned at the gear-box homonymy with the brake torsion spring; Said L shaped brake catch base is provided with a draw-in groove 53, and the pothook of brake torsion spring one end snaps in the draw-in groove, and the brake torsion spring other end leans the side of L shaped brake washer.Chela 11 was stirred the motion of brake washer before said protective plate bottom was provided with.Said protective plate bottom is provided with back chela 12 at preceding chela rear side; The jaw groove 13 that preceding chela and back chela surround; Brake catch rear end is located in the jaw groove, and the side of said back chela is provided with a controller 4, and chela was pinned gauge tap after protective plate was pulled then backward; Motor is in opening, and chela and gauge tap were thrown off the power supply that breaks off motor in advance after protective plate was pulled then backward.Said brake catch rear end is provided with a circular arc protruding 51 and the bottom effect of preceding chela, and brake catch front end is provided with the plain hook portion 52 with the Brake torsion spring effect.Said protective plate is a lever construction, and balance pivot 14 is near chela rear portion, back.Said output gear is provided with a tubular protuberance 91, and a Brake torsion spring part is located on the tubular protuberance, is provided with axle sleeve 8 between tubular protuberance and Brake torsion spring.

Brake torsion spring 2 can drive brake washer 5 and reset, and protective plate 1 chela 11 of going forward can be stirred brake washer motion, and back chela 12 toggle switches realize that brake cuts off the power supply.

As shown in Figure 2, chain saw is when work, and protective plate 1 is for pull backward; Pin gauge tap 4, be in opening, withstand brake washer 5; Make brake washer 5 turn clockwise, thereby brake block 5 and Brake torsion spring 7 are thrown off fully, make the chain saw operate as normal along alignment pin 3.

As shown in Figure 3, chain saw is when brake, and protective plate 1 is pulled forward; Threw off with gauge tap 4 before this, broke off the power supply of motor in advance, prevented that drive motors from generating heat because of electric current is excessive; Then and brake washer 5 throw off, brake washer 5 is rotated counterclockwise along alignment pin 3 under the effect of brake torsion spring 2, and under gear-box 10 spacing, stops; This moment, the other end withstood Brake torsion spring 7, stoped the rotation of Brake torsion spring 7, thereby reached the purpose of brake.Brake torsion spring 7 opens with output gear 9 fitting part branches under the effect of brake washer 5; Thereby Brake torsion spring 7 belongs to disengaged condition with output gear 9; Thereby reduced the impact of 7 pairs of brakes of Brake torsion spring washer 5, the service life of having improved brake washer 5 and alignment pin 3.

Claims

1. chain saw machinery brake structure; Comprise gear-box (10), be provided with output shaft (6) in the gear-box, establish output gear (9) on the output shaft; It is characterized in that: brake structure also comprises a Brake torsion spring (7); Said Brake torsion spring partly is tight with on the output gear, and Brake torsion spring another part is tight with on the output shaft, and drive of motor is through pass through the Brake torsion spring transmission output shaft again behind the output gear; Said gear-box sidepiece through an alignment pin (3) be rotationally connected one the brake catch (5); The effect of brake catch rear end and a protective plate (1), protective plate are rotated and are driven the brake catch and rotate and makes brake catch front end with Brake torsion spring effect braking or break away from Brake torsion spring, and said alignment pin (3) is gone up socket one torsion spring (2) that brakes and realized braking and automatically reply original position after catch is braked.

2. chain saw machinery brake structure according to claim 1, it is characterized in that: said brake catch (5) is for L shaped, and L shaped corner is rotationally connected with on the gear-box through alignment pin (3).

3. chain saw machinery brake structure according to claim 2; It is characterized in that: said brake washer (5) is positioned at the gear-box homonymy with the brake torsion spring; Said L shaped brake catch base is provided with a draw-in groove (53); The pothook of brake torsion spring one end snaps in the draw-in groove, and the brake torsion spring other end leans the side of L shaped brake washer.

4. chain saw machinery brake structure according to claim 1, it is characterized in that: said protective plate (1) bottom is provided with preceding chela (11) and stirs brake washer (5) motion.

5. chain saw machinery brake structure according to claim 4; It is characterized in that: said protective plate (1) bottom is provided with back chela (12) at preceding chela rear side, and preceding chela is located in the jaw groove with the jaw groove (13) that the back chela surrounds, catch (5) rear end of braking; The side of said back chela is provided with a controller (4); Chela was pinned gauge tap after protective plate (1) was pulled then backward, and motor is in opening, and chela and gauge tap were thrown off the power supply that breaks off motor in advance after protective plate was pulled then backward.

6. chain saw machinery brake structure according to claim 4 is characterized in that: said brake catch (5) rear end is provided with a circular arc protruding (51) and the bottom effect of preceding chela, and brake catch front end is provided with the plain hook portion (52) with the Brake torsion spring effect.

7. chain saw machinery brake structure according to claim 4, it is characterized in that: said protective plate (1) is a lever construction, balance pivot (14) is near chela rear portion, back.

8. according to each described chain saw machinery brake structure of claim 1 to 7; It is characterized in that: said output gear (9) is provided with a tubular protuberance (91); A Brake torsion spring part is located on the tubular protuberance, is provided with axle sleeve (8) between tubular protuberance and Brake torsion spring.