阅读说明：本技术 油锯离合器及链条散热装置 (Chain saw clutch and chain heat abstractor ) 是由 杨海岳 王程 于 2019-10-14 设计创作，主要内容包括：本发明创造公开了一种油锯离合器及链条散热装置,包括右箱体、链板、右曲柄、保持架、蹄块、离合器壳体、链轮、锯链、刹车带,所述的链板和离合器壳体上对应设有若干个与锯链锯齿相对应的链板进风口和壳体进风口,离合器壳体的外罩与蹄块组成壳体环形内通道,离合器壳体的外罩、刹车带与离合器室的外壁组成壳体环形外通道,链板上设有环形导流片,环形导流片与链板壳体组成环形射流通道,壳体环形外通道的出风口正对环形射流通道,在相邻蹄块之间形成蹄块间隙,链板上设有与环形射流通道相通的排风口。采用本结构后,具有结构简单合理、安装使用方便、散热效果好、锯切效率高、使用寿命长、并能吹扫链板木屑等优点。(The invention discloses a chain saw clutch and a chain heat dissipation device, which comprises a right box body, chain plates, a right crank, a retainer, shoe blocks, a clutch shell, a chain wheel, a saw chain and a brake belt, wherein the chain plates and the clutch shell are correspondingly provided with a plurality of chain plate air inlets and shell air inlets corresponding to saw teeth of the saw chain, an outer cover of the clutch shell and the shoe blocks form a shell annular inner channel, an outer cover of the clutch shell, the brake belt and the outer wall of a clutch chamber form a shell annular outer channel, the chain plates are provided with annular flow deflectors, the annular flow deflectors and the chain plate shell form an annular jet flow channel, an air outlet of the shell annular outer channel is opposite to the annular jet flow channel, shoe block gaps are formed between adjacent shoe blocks, and the chain plates are provided with air outlets communicated with the annular jet flow channel. After adopting this structure, have simple structure reasonable, installation convenient to use, radiating effect good, saw cut efficient, long service life and can sweep advantages such as link joint saw-dust.)

1. A chain saw clutch and chain heat dissipation device comprises a right box body (14), a chain plate (6), a right crank (1), a retainer (5), a shoe block (17), a clutch shell (18), a chain wheel (4), a saw chain (19) and a brake belt (8), wherein the right crank (1) is rotatably arranged on a clutch chamber of the right box body (14), the clutch shell (18) is rotatably arranged on the right crank (1), the chain wheel (4) is arranged on a spline sleeve of the clutch shell (18), the saw chain (19) is arranged on the chain wheel (4), the chain plate (6) covers the chain wheel (4) and is fixed with the right box body (14), the brake belt (8) is sleeved on the clutch shell (18), the retainer (5) is of a star-shaped structure and is fixed on the right crank (1), the shoe block (17) is correspondingly arranged on the retainer (5) and is mutually connected through a clutch spring (7), and is confined inside by the outer cover of the clutch housing (18), characterized in that: the saw chain type brake device is characterized in that a plurality of chain plate air inlets (a) and a plurality of shell air inlets (b) corresponding to saw teeth of a saw chain (19) are correspondingly arranged on a chain plate (6) and a clutch shell (18), an outer cover of the clutch shell (18) and shoe blocks (17) form a shell annular inner channel (d), an outer cover of the clutch shell (18), a brake band (8) and an outer wall of a clutch chamber form a shell annular outer channel (e), an annular flow deflector (6a) is arranged on the chain plate (6), the annular flow deflector (6a) and the chain plate shell form an annular jet flow channel (22), an air outlet of the shell annular outer channel (e) is over against the annular jet flow channel (22), shoe block gaps (c) are formed between adjacent shoe blocks (17), and an air outlet (21) communicated with the annular jet flow channel (22) is arranged on the chain plate (6; the clutch housing (18), the retainer (5), the shoe block (17) and the clutch spring (7) form a centrifugal fan when rotating at high speed, a negative pressure area (23) which is connected with the shoe block gap (c) and corresponds to the housing air inlet (b) is formed in the clutch spring (7) area, cooling air is continuously sucked from the housing air inlet (b), the cooling air enters the housing annular inner channel (d) through the shoe block gap (c) under the action of centrifugal force and forms a high pressure area, and high-pressure cooling air of the housing annular inner channel (d) is deflected to be sprayed to the annular jet flow channel (22) through the housing annular outer channel (e) and then is discharged from the air outlet (21).

2. The chain saw clutch and chain heat sink as recited in claim 1, further comprising: the ratio of the section of the shell air inlet (b) sucking air to the section of the shell annular outer channel (e) discharging air is a speed increasing ratio which is controlled between 1.3 and 3.

3. The chain saw clutch and chain heat sink as claimed in claim 1 or 2, wherein: and a point-shaped supporting part (24) matched with the brake band (8) is arranged on the right box body (14), so that cooling air flows on two sides of the brake band (8).

4. The chain saw clutch and chain heat sink as recited in claim 3, wherein: a worm (9) is installed on the right crank (1) through a worm retainer ring (11), an oil pump (10) is installed on the right box body (14), the worm (9) is meshed with a worm wheel on the oil pump (10), one end of a worm deflector rod (15) is connected to the worm (9), the other end of the worm deflector rod is inserted into an outer cover groove of a clutch shell (18), when the clutch shell (18) is driven by a shoe block (17), the worm deflector rod (15) drives the worm (9) to rotate, and the worm (9) drives the oil pump (10) to rotate to pump oil.

5. The chain saw clutch and chain heat sink as recited in claim 4, wherein: and a clutch pad (16) is arranged on the right crank (1) at the lower part of the retainer (5), and a reduction grinding disc (3) is arranged on the end surface of the right crank (1) through a clamp spring (20).

Technical Field

The invention relates to the technical field of chain saws of two-stroke engines, in particular to a chain saw clutch and a saw chain heat dissipation device for accelerating cooling of the clutch and a saw chain.

Background

The two-stroke engine chain saw is a handheld power tool for lumbering and wood blanking, and has the following defects in the using process: firstly, the saw chain wearing and tearing problem: that is, the friction between the saw chain and the wood is increased due to poor lubrication of the engine oil or the wood itself, so that excessive heat is generated, the saw chain is severely worn, and the service life of the saw chain and the sawing efficiency are reduced. Secondly, the clutch wear problem: the clutch works under the state of frequent combination and separation or the saw chain is blocked, the phenomenon of high-speed sliding friction can occur, so that the shoe block and the clutch shell are severely abraded, a clutch spring generates fatigue fracture at high temperature, the sawing efficiency is seriously influenced, and meanwhile, the safety problem is caused. Thirdly, the problem of abrasion of the brake band is as follows: the brake band can also cause the high temperature in frequent braking and fatigue test, leads to the brake time extension, exceeds safe range, has the potential safety hazard. Fourthly, the worm fails: because the worm is generally made of nylon materials, when the temperature of the clutch is too high, high temperature can be transmitted to the position of the worm along the right crank, the strength of the worm is reduced, threads are damaged or directly melted, so that the oil pump cannot work, and the guide plate and the saw chain are further severely abraded and failed under the condition of no lubrication oil lubrication. Fifthly, the problem of wood chip accumulation of the chain plate is as follows: when the sawing wood material is more flexible or the diameter is too large, the sawdust can be rapidly accumulated on the inner side of the chain plate, so that the sawdust blocks the moving part, the sawdust can not be discharged, and the work is stopped. In order to solve the problems, no effective solution exists in the industry at present. Therefore, many scientific research institutions, manufacturers and acquaintances are continuously developing and researching, but no ideal product is yet available.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide the chain saw clutch and the saw chain heat dissipation device which have the advantages of simple and reasonable structure, convenience in installation and use, good heat dissipation effect, high saw cutting efficiency and long service life and can sweep the saw dust of the chain plates.

The invention creates and solves the technical scheme adopted by the technical problems, which comprises a right box body, a chain plate, a right crank, a retainer, a shoe block, a clutch shell, a chain wheel, a saw chain and a brake belt, wherein the right crank is rotatably arranged on a clutch chamber of the right box body through a right box bearing, the clutch shell is rotatably arranged on the right crank through a needle bearing, the chain wheel is arranged on a spline sleeve of the clutch shell, the saw chain is arranged on the chain wheel, the chain plate covers the chain wheel and is fixed with the right box body, the brake belt is sleeved on the clutch shell, the retainer is in a star-shaped structure and is fixed on the right crank, the shoe block is correspondingly arranged on the retainer and is mutually connected through a clutch spring and is limited in the clutch shell by an outer cover of the clutch shell, the chain plate and the clutch shell are correspondingly provided with a plurality of chain plate air inlets and shell air inlets corresponding to, the outer cover of the clutch shell and the shoe blocks form a shell annular inner channel, the outer cover of the clutch shell, the brake band and the outer wall of the clutch chamber form a shell annular outer channel, the chain plate is provided with an annular flow deflector, the annular flow deflector and the chain plate shell form an annular jet flow channel, the air outlet of the shell annular outer channel is over against the annular jet flow channel, shoe block gaps are formed between adjacent shoe blocks, and the chain plate is provided with an air outlet communicated with the annular jet flow channel; the clutch shell, the retainer, the shoe block and the clutch spring form a centrifugal fan when rotating at high speed, a negative pressure area which is connected with the shoe block gap and corresponds to the shell air inlet is formed in the clutch spring area, cooling air is continuously sucked from the shell air inlet, the cooling air enters the shell annular inner channel through the shoe block gap under the action of centrifugal force and forms a high pressure area, and high-pressure cooling air in the shell annular inner channel is deflected to be sprayed to the annular jet flow channel through the shell annular outer channel and then is discharged from the air outlet.

In the further scheme of the invention, the ratio of the section of the air inlet of the shell sucking air to the section of the annular outer channel of the shell discharging air is a speed increasing ratio which is controlled between 1.3 and 3.

In a further scheme of the invention, the right box body is provided with a point-shaped supporting part matched with the brake band, so that cooling air flows on two sides of the brake band.

According to the further scheme provided by the invention, a worm is arranged on the right crank through a worm retainer ring, an oil pump is arranged on the right box body, the worm is meshed with a worm wheel on the oil pump, one end of a worm deflector rod is connected to the worm, the other end of the worm deflector rod is inserted into an outer cover groove of the clutch shell, when the clutch shell is driven by a shoe block, the worm is driven by the worm deflector rod to rotate, and the worm drives the oil pump to rotate to pump oil.

According to the further scheme provided by the invention, a clutch pad is arranged on a right crank at the lower part of the retainer, and a friction reducing plate is arranged on the end surface of the right crank through a clamp spring.

After adopting above-mentioned structure, compare with prior art and have following advantage and effect: firstly, saw cut timber in-process at a high speed, cooling air gets into the casing air intake after passing the saw chain sawtooth of motion and gap from the link joint air intake, and the saw chain is effectively taken away because of the heat that the friction produced, can effectively prolong the life of saw chain. Secondly, when high and low speed is frequently switched, because cooling air generates high-speed flow between the shoe block and the clutch shell of the clutch and between the clutch shell and the brake band, heat generated by friction of the shoe block, the clutch shell and the brake band is quickly taken out from the cooling channel, the shoe block, the clutch shell, the brake band and the clutch spring cannot generate high-temperature color change, and the cooling effect on the clutch and the brake is obvious; the cooling air can also generate better cleaning and blowing capacity for chain plate chip removal in the process of sawing the wood at a high speed, the wood chips can be blown away instantly, and accumulated chips cannot be generated in the chain plate and the clutch at all, so that the wood sawing efficiency and the reliability of brake braking are improved. And the cooling device has a good cooling effect on the right crank and the worm, so that the problem that the worm is damaged or melted by threads is solved, the lubricating function of the oil pump on the two-stroke engine oil saw is ensured, and abnormal abrasion of the guide plate and the saw chain is prevented, so that the saw cutting efficiency is improved, and the saw cutting cost is reduced. Fourthly, the right box body and related parts on the periphery are cooled, so that the temperature in the crankcase is further reduced, the inflation efficiency in the air inlet process is improved, the quantity of working media for ignition and combustion is increased, the powerful sawing power and the torque reserve coefficient are ensured, and the chain clamping phenomenon in the sawing process is effectively prevented.

Drawings

Fig. 1 is a schematic front view of the present invention.

Fig. 2 is a schematic cross-sectional view a-a of the invention in the idle state of fig. 1.

Fig. 3 is a schematic cross-sectional view B-B of fig. 2 created by the present invention.

Fig. 4 is a schematic front view of the chain plate and the saw chain of fig. 1 without the chain plate and the saw chain.

Fig. 5 is a schematic cross-sectional view of the invention in the idle state of fig. 2.

FIG. 6 is a schematic cross-sectional view taken along line A-A of FIG. 1 in a high speed state according to the present invention.

FIG. 7 is a schematic cross-sectional view of the high speed state of FIG. 6 according to the present invention.

The hydraulic transmission mechanism comprises a right crank 1, a needle bearing 2, a reduced grinding plate 3, a chain wheel 4, a retainer 5, a chain plate 6, an annular guide vane 6a, a clutch spring 7, a brake belt 8, a worm 9, an oil pump 10, a worm retainer ring 11, an oil seal 12, a right box bearing 13, a right box 14, a worm deflector rod 15, a clutch pad 16, a shoe block 17, a clutch shell 18, a saw chain 19, a snap spring 20, an air outlet 21, an annular jet flow channel 22, a negative pressure zone 23, a point-shaped supporting part, a chain plate air inlet, a shell air inlet b, a shoe block gap c, a shell annular inner channel d and a shell annular outer channel e.

Detailed Description

Fig. 1 to 7 show that, for the invention, a specific embodiment of a chain saw clutch and a saw chain heat sink is created, which includes a right box 14, a link plate 6, a right crank 1, a holder 5, a shoe 17, a clutch housing 18, a sprocket 4, a saw chain 19, a brake band 8, wherein the right crank 1 is rotatably mounted on a clutch chamber of the right box 14 through a right box bearing 13 and an oil seal 12, the clutch housing 18 is rotatably mounted on the right crank 1 through a needle bearing 2, the sprocket 4 is mounted on a spline housing of the clutch housing 18, the saw chain 19 is mounted on the sprocket 4, the link plate 6 covers the sprocket 4 and is fixed with the right box 14, the brake band 8 is sleeved on the clutch housing 18, the holder 5 is in a star-shaped structure and is fixed on the right crank 1, the shoe 17 is correspondingly disposed on the holder 5 and is connected with each other through a clutch spring 7, and is limited inside by an outer cover of the clutch housing 18, the chain plate 6 and the clutch shell 18 are correspondingly provided with a plurality of chain plate air inlets a and shell air inlets b corresponding to saw teeth of the saw chain 19, an outer cover of the clutch shell 18 and the shoe blocks 17 form a shell annular inner channel d, an outer cover of the clutch shell 18, the brake band 8 and the outer wall of the clutch chamber form a shell annular outer channel e, the chain plate 6 is provided with an annular flow deflector 6a, the annular flow deflector 6a and the chain plate shell form an annular jet flow channel 22, an air outlet of the shell annular outer channel e is over against the annular jet flow channel 22, shoe block gaps c are formed between adjacent shoe blocks 17, and the chain plate 6 is provided with an air outlet 21 communicated with the annular jet flow channel 22; the clutch shell 18, the retainer 5, the shoe block 17 and the clutch spring 7 form a centrifugal fan when rotating at high speed, a negative pressure area 23 which is connected with the shoe block clearance c and corresponds to the shell air inlet b is formed in the area of the clutch spring 7, cooling air is continuously sucked from the shell air inlet b through the negative pressure of the negative pressure area 23, the cooling air enters the shell annular inner channel d through the shoe block clearance c under the action of centrifugal force and forms a high pressure area, and the high-pressure cooling air of the shell annular inner channel d is deflected to be sprayed to the annular jet flow channel 22 through the shell annular outer channel e and then is discharged from the air outlet 21. The annular flow deflector 6a can prevent the high-pressure air discharged from the annular outer passage e of the housing from mixing with the entering cooling air.

In order to achieve the best cooling and heat dissipation effect, the ratio of the section of the shell air inlet b sucking air to the section of the shell annular outer channel e discharging air is a speed increasing ratio, and the speed increasing ratio is controlled to be between 1.3 and 3.

In order to improve the cooling and heat dissipation effects of the brake band 6, the right box 14 is provided with a point-shaped supporting portion 24 which is matched with the brake band 8, so that cooling air flows on both sides of the brake band 8.

In order to ensure an effective lubricating effect, a worm 9 is mounted on the right crank 1 through a worm retainer ring 11, an oil pump 10 is mounted on the right box body 14, the worm 9 is meshed with a worm wheel on the oil pump 10, one end of a worm deflector rod 15 is connected to the worm 9, the other end of the worm deflector rod 15 is inserted into an outer cover groove of a clutch shell 18, when the clutch shell 18 is driven by a shoe block 17, the worm 9 is driven to rotate through the worm deflector rod 15, and the worm 9 drives the oil pump 10 to rotate to pump oil.

In order to ensure the stability and reliability of the work, a clutch pad 16 is arranged on the right crank 1 at the lower part of the retainer 5, and a small anti-friction sheet 3 is arranged on the end surface of the right crank 1 through a clamp spring 20.

When the crank is in an idle state, because the centrifugal force is small in the idle state, the shoe block 17 is separated from the clutch shell 18 under the traction of the clutch spring 7, and the clutch shell 18 does not rotate together with the right crank 1; at the moment, the centrifugal fan consists of a retainer 5, a shoe block 17 and a clutch spring 7, cooling air enters the saw teeth of the cooling saw chain 19 from a chain plate air inlet a, then enters a negative pressure area 23 through a shell air inlet b, and rotates together with the centrifugal fan consisting of the retainer 5, the shoe block 17 and the clutch spring 7, the cooling air enters a shell annular inner channel d through a shoe block gap c under the action of centrifugal force, and high-pressure cooling air of the shell annular inner channel d turns to be sprayed to an annular jet flow channel 22 through a shell annular outer channel e and then is discharged from an air outlet 21; at this time, because the rotating speed is slow, the suction force of the negative pressure area is small, the cooling air entering from the air inlet b of the shell has slow flow rate and small flow rate, and the cooling effect is poor.

The invention is created when being in high speed, the clutch housing 18 rotates with the right crank 1, because the centrifugal force is bigger under the high speed state, the shoe 17 overcomes the traction force of the clutch spring 7 and moves outward to contact with the clutch housing 18 and produce radial pressure, thus produce the tangential friction with the clutch housing 18, thus drive the clutch housing 18 to rotate together, at this moment, the cooling air enters the saw teeth of the cooling saw chain 19 from the chain plate air inlet a, then enters the negative pressure zone 23 through the housing air inlet b, and rotates with the centrifugal fan composed of the retainer 5, the shoe 17, the clutch spring 7 and the clutch housing 18, because the rotating speed is fast, the negative pressure of the negative pressure zone 23 is big, the cooling air enters the housing annular inner channel d through the shoe clearance c under the centrifugal force and forms the high pressure zone, at this moment, the clutch annular inner channel d has been divided into 3 independent areas by the shoe 17, the high-pressure cooling air in the high-pressure area enters the annular inner channel d of the shell through the shoe block gap c under the action of centrifugal force, turns and is sprayed to the annular jet flow channel 22 through the annular outer channel e of the shell and then is discharged from the air outlet 21.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention in any way, and simple modifications, equivalent changes and modifications may be made without departing from the technical solutions of the present invention.