CN115104448A - Chain saw with automatically tensioned chain - Google Patents
Chain saw with automatically tensioned chain Download PDFInfo
- Publication number
- CN115104448A CN115104448A CN202210640227.7A CN202210640227A CN115104448A CN 115104448 A CN115104448 A CN 115104448A CN 202210640227 A CN202210640227 A CN 202210640227A CN 115104448 A CN115104448 A CN 115104448A
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- Prior art keywords
- chain
- cylinder
- engine
- piston
- clutch mechanism
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
- A01G3/08—Other tools for pruning, branching or delimbing standing trees
- A01G3/085—Motor-driven saws for pruning or branching
- A01G3/086—Chain saws
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G23/00—Forestry
- A01G23/02—Transplanting, uprooting, felling or delimbing trees
- A01G23/08—Felling trees
- A01G23/091—Sawing apparatus specially adapted for felling trees
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
- A01G3/04—Apparatus for trimming hedges, e.g. hedge shears
- A01G3/0435—Machines specially adapted for shaping plants, e.g. topiaries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Ecology (AREA)
- Forests & Forestry (AREA)
- Environmental Sciences (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The invention relates to a chain saw capable of automatically tensioning a chain, which comprises a guide plate, an engine, a cylinder, a piston, a channel, a one-way valve, a one-way clutch mechanism and the like. The air pressure in the engine drives the cylinder and the piston to act, the relative position of the cylinder and the piston is unidirectionally positioned by using the one-way clutch mechanism, the chain is tensioned when the chain is static by using small force, and the tensioned chain working position is kept by using the one-way clutch mechanism when the chain moves at high speed and the pressure on the tensioning mechanism is large. The invention can realize the automatic tensioning of the chain and simultaneously has more free design on the tensioning mechanism.
Description
Technical Field
The invention relates to the technical field of garden tools, in particular to a chain saw capable of automatically tensioning a chain.
Background
Gardening workers usually need to trim shrubs or prune or fell some trees during working, chain saws are needed at the moment, and gasoline-powered chain saw devices are often used due to inconvenient connection of energy sources during outdoor working.
The chain saw often becomes loose after a period of use, and the tightness of the chain needs to be adjusted at this moment, and the chain needs to be replaced by a new chain after the chain is worn to a certain degree. After the new chain is replaced, the tension of the chain needs to be adjusted to ensure that the chain works normally. The conventional chain saw fixes a guide plate of the chain saw through a fastening bolt, when the chain is too loose or needs to be replaced, the fastening bolt is unscrewed by using a tool, the position of the guide plate is manually adjusted, the guide plate is determined according to subjective feeling and then the guide plate is screwed for fixation, the operation process is relatively complicated, and certain requirements are met on the operation skill and experience level of workers.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides the chain saw with the automatic tensioning chain, which is simple in structure and reliable in work, can drive a guide plate by utilizing the air pressure of an engine, and meets the requirement of automatically adjusting the tightness of the chain.
The technical scheme for realizing the purpose of the invention is as follows:
a chain saw with a self-tensioning chain is characterized in that: the device comprises a guide plate, an engine, a cylinder, a piston, a channel, a one-way valve and a one-way clutch mechanism; the engine is a crankcase scavenged two-stroke engine, the cylinder is fixedly arranged on the outer side of the engine, the piston is arranged on the cylinder in a sliding fit manner, and one outward end of the piston abuts against the guide plate; the one-way clutch mechanism is arranged between the cylinder and the piston; the two ends of the channel are respectively communicated with the inside of a crankcase and the inside of the cylinder of the engine, and the one-way valve is installed in the channel.
The one-way clutch mechanism comprises a wedge-shaped groove, a roller arranged in the wedge-shaped groove, and an actuating element, wherein the maximum depth of the wedge-shaped groove is larger than the diameter of the roller, the minimum depth of the wedge-shaped groove is smaller than the diameter of the roller, and the actuating element pushes the roller to the direction with the minimum depth.
The one-way clutch mechanism comprises a groove, a friction block and a retainer, wherein the friction block and the retainer are arranged in the groove, the friction block is provided with a large diameter and a small diameter, the depth of the groove is larger than the small diameter of the friction block and smaller than the large diameter of the friction block, and the retainer enables the friction block to work in the groove in the large diameter.
The one-way clutch mechanism comprises a pawl, a ratchet and an elastic element, wherein the elastic element enables the pawl to be meshed with the ratchet.
And one side of the one-way clutch mechanism is provided with an operation hole.
The engine is characterized by further comprising a fixing bolt, a threaded hole is formed in the outer wall of the engine, the fixing bolt is matched with the threaded hole, and the air cylinder is fixedly installed on the outer side of the engine.
The piston is characterized by further comprising a second one-way valve, a pressure relief hole is formed in the cylinder or the piston, and the second one-way valve is arranged inside the cylinder or inside the piston and used for being switched on or switched off the pressure relief hole.
And a sealing device is arranged between the cylinder and the piston.
And a sealing device is arranged between the cylinder and the engine or between the cylinder and the fixing bolt.
Compared with the prior art, the technical scheme of the invention at least has the following advantages:
the invention utilizes the characteristics of a crankcase scavenged two-stroke engine, realizes the driving of a piston by introducing the pressure in the crankcase of the engine into an external driving cylinder, automatically adjusts the position of a guide plate by the driving force when a chain is static, realizes the automatic tensioning of the chain, generates larger pressure on the end part of the guide plate due to the high-speed movement of the chain in the working process of the chain saw, fixes the relative position of the piston and the cylinder by a one-way clutch mechanism, fixes the position of the guide plate, keeps the tension of the chain unchanged, does not need to adjust the tightness of the chain in use, releases the pressure in the cylinder only when the chain needs to be replaced, moves the guide plate to replace the chain, and can also automatically realize the adjustment of new tightness of the chain after replacement.
The chain is tensioned when the chain is static, and the tension is kept by using the one-way clutch mechanism when the chain saw works, so that the required tension is smaller, the shapes and the sizes of the piston and the cylinder are more freely designed, different structures and sizes and shapes can be adopted according to different performances such as power and the like of an engine and the chain saw, different tension sizes are realized, and the requirements of series products are met.
Drawings
FIG. 1 is a front view of a first embodiment of a chain saw with automatic tensioning of the chain of the present invention.
FIG. 2 is a schematic view of a section A-A of a first embodiment of a chain saw with automatic tensioning of the chain of the present invention.
Fig. 3 is a schematic structural view of a second embodiment of the chain saw with a self-tensioning chain according to the present invention.
The description is marked in the drawings: 1-guide plate, 2-driving wheel, 3-cylinder, 4-piston, 5-fixing bolt, 6-channel, 7-chain, 8-engine, 9-one-way valve, 10-second one-way valve, 11-roller, 12-spring, 13-friction block, 14-retainer, 15-small diameter, 16-large diameter.
Detailed Description
An embodiment of the present invention will be described in detail with reference to fig. 1 and 2.
In the embodiment, the chain saw with the chain automatically tensioned comprises a guide plate 1, a driving wheel 2, a chain 7, an engine 8, a cylinder 3, a piston 4, a channel 6 and a one-way valve 9, wherein the engine 8 is a crankcase scavenging two-stroke engine, the engine 8 drives the driving wheel 2 to rotate, and the chain 7 is arranged on the guide plate 1 and is driven to rotate by the driving wheel 2; a fixing bolt 5 near the piston 4 passes through the inside of the cylinder 3 to be engaged with a screw hole of the engine 8, and fixes the cylinder 3, and the outer surface of the fixing bolt 5 is exposed to the inside of the cylinder 3. The piston 4 is arranged at one end of the cylinder 3 in a sliding fit manner, is specifically arranged in the cylinder 3, and is abutted against the guide plate 1 at one outward side (right side) of the piston 4; a passage 6 is provided inside the fixing bolt 5, one end of which communicates with the inside of a crankcase of an engine 8 and the other end of which communicates with the inside of the cylinder 3; a non-return valve 9 is mounted in the passage 6 and only allows flow from the crankcase into the cylinder 3. The one-way clutch mechanism is arranged between the cylinder 3 and the piston 4, and is characterized in that a wedge-shaped groove is arranged on the piston 4, a spring 12 and a roller 11 are arranged in the wedge-shaped groove, and the diameter of the roller 11 is larger than the depth of the shallow end of the wedge-shaped groove and smaller than the depth of the deep end of the wedge-shaped groove. The spring 12 urges the roller 11 towards the shallow end of the wedge-shaped groove. One end of the right side of the one-way clutch mechanism is provided with an operation hole.
The piston 4 is provided with a sealing member at a joint portion with the cylinder 3 to improve a sealing effect and prevent gas leakage. The joint of the fixing bolt 5 and the cylinder 3 and the joint of the fixing bolt 5 and the engine 8 are respectively provided with a sealing device (not shown in the figure) to ensure the sealing effect.
When the engine 8 runs, the piston of the engine 8 descends by utilizing the scavenging function of the crankcase, after an air inlet on a cylinder sleeve of the engine 8 is sealed, the gas in the crankcase is compressed, the air pressure is increased, when the pressure in the crankcase is higher than the pressure in the cylinder 3, the check valve 9 is opened, the gas with certain pressure enters the cylinder 3 through the check valve 9 and the channel 6, the piston 4 is pushed to move rightwards, the guide plate 1 is pushed to move rightwards synchronously, and the chain 7 is tensioned. In this process, the roller 11 compresses the spring 12 to move toward the deep end of the wedge groove due to the relative movement between the piston 4 and the cylinder 3, i.e., the one-way clutch mechanism is disengaged, and thus, the normal operation is possible.
This process is always present during operation of the engine 8, in particular before the clutch at the drive sprocket 2 is engaged, i.e. the engine 8 is running, and the chainsaw is brought into a ready-to-run state, in which the chain 7 is in a free state at a standstill, so that a natural chain tensioning can be achieved. After the clutch at the driving wheel 2 is engaged, namely the chain saw enters a working state, the chain 7 is driven by the driving wheel 2 to rotate, the chain 7 rotating at high speed generates larger pressure on the guide plate 1, this pressure is transmitted via the guide plate 1 to the piston 4, which piston 4 moves to the left with respect to the cylinder 3, the tendency of the relative movement between the two being to move the roller 11 to the right, i.e., toward the shallow end of the wedge groove, since the diameter of the roller 11 is greater than the depth of the shallow end of the wedge groove, the one-way clutch mechanism is engaged, namely, the piston 4 is static relative to the cylinder 3 and cannot move rightwards, and only the previous guide plate position can be kept, so that the tensioning state of the chain 7 during operation is maintained, even if the pressure in the cylinder 3 is not enough to balance the pressure of the chain 7 moving at high speed on the guide plate 1, the guide plate position can be kept through the one-way clutch mechanism, and unstable operation or even abnormal operation caused by factors such as looseness of the chain 7 can not occur.
In the working process of the chain saw, as the engine 8 is always in a working state, when the chain 7 stretches due to factors such as continuous use and the like, the piston 4 is naturally driven by the pressure in the cylinder 3 to move rightwards to push the guide plate 1 to move rightwards along with the piston, and the chain 7 always keeps a corresponding tensioning degree, namely, due to the action of the check valve 9, the pressure in the cylinder 3 always keeps the maximum value of the pressure in a crankcase of the engine 8, so that the effect of pushing the guide plate 1 rightwards with a certain tensioning force is always kept, and the chain 7 always keeps the corresponding tensioning degree. The pressure of the chain 7 moving at high speed on the guide plate 1 is balanced by the one-way clutch mechanism, and the pressure of the cylinder 3 on the piston 4 is not needed for balancing.
When the chain 7 is worn to a certain degree and needs to be replaced, the fixing bolt 5 is loosened, high-pressure gas in the cylinder 3 is released, the fixing bolt extends into an operation hole through a specific special tool on one side of the operation hole of the one-way clutch mechanism, the working state of the one-way clutch mechanism is changed, the one-way clutch mechanism is always kept separated through the specific special tool, the roller 11 is enabled to always compress the spring 12 and is located at the deep end of the wedge-shaped groove, the guide plate 1 can be pushed leftwards at the moment, the piston 4 can also move leftwards along with the guide plate 1, the chain 7 can be taken off from the guide plate, a new chain is replaced, then the fixing bolt 5 is screwed, other operations are not needed, as long as the sealing of the fixing bolt 5 and the cylinder 3 at the head part of the fixing bolt and the sealing of the cylinder 3, the fixing bolt 5 and the engine 8 at the inner side of the cylinder 3 are ensured, the engine is started, a crankcase of the two-stroke engine is utilized for scavenging, high pressure can be reestablished in the cylinder 3, the piston 4 and the guide plate 1 are pushed to move rightwards, and the tensioning of a new chain is realized. This process can be realized just before action wheel 2 rotates, therefore when changing chain 7 and tensioning new chain again, the chain all is in quiescent condition, only the removal of baffle 1, can accomplish the tensioning process before chain 7 rotates, other abnormal conditions can not appear. The replacement of the chain 7, etc., is basically inexperienced or requires skill in operation for the operator, yet the tensioning of the chain 7 can be reliably achieved to the desired degree of tensioning.
In the second embodiment shown in fig. 3, the channel 6 is no longer disposed inside the fixing bolt 5, the piston 4 is no longer disposed inside the cylinder 3, but is mounted outside the cylinder 3 through a sliding fit, the one-way clutch mechanism is disposed between the cylinder 3 and the piston 4, which is specifically represented by providing a groove on the cylinder 3, the groove having a friction block 13 and a retainer 14, the friction block 13 having a major diameter 16 and a minor diameter 15, and the groove having a depth greater than the minor diameter 15 and less than the major diameter 16. The cage 14 causes the friction blocks 13 to operate in the grooves with a large diameter 16. One end of the left side of the one-way clutch mechanism is provided with an operation hole. A second check valve 10 is also installed in the cylinder 3 to close the pressure relief hole in the cylinder 3.
The concrete working process of the second embodiment is basically the same as that of the first embodiment, and the tensioning can be realized by utilizing the air pressure in the crankcase of the engine 8 when the chain 7 is static, and when the chain runs at high speed and the pressure on the guide plate 1 is larger, the position of the guide plate 1 is kept through the combined one-way clutch mechanism, namely the tensioning degree of the chain 7 is ensured. The difference is that when the chain needs to be replaced, a tool is needed to open the second one-way valve 10 to release pressure, the pressure in the cylinder 3 is reduced, a special tool is inserted into the operation hole, the working state of the one-way clutch mechanism is changed, the one-way clutch mechanism is always kept separated, and then the guide plate 1 and the piston 4 are moved leftwards. The rest of the working process, the tensioning process and the like are basically the same as the embodiment one, and detailed description is omitted here.
The one-way clutch mechanism can also adopt a pawl and ratchet structure, when the piston 4 is relatively far away from the cylinder 3, the pawl and ratchet are separated, and when the piston 4 is relatively close to the cylinder 3, the pawl and ratchet are combined.
The operation hole of one-way clutch mechanism one side is used for inserting specific specialized tool according to one-way clutch mechanism's structure, changes one-way clutch mechanism's operating condition when the chain needs to be changed, makes it keep separating to can promote baffle and piston and be close to the cylinder, be convenient for change the chain, need carry out the pressure release to the cylinder earlier this moment, can adopt the pressure release of second check valve, also can adopt the mode pressure release of dismantling fixing bolt when fixing bolt surface and cylinder inside communicate with each other.
The characteristics of a wedge-shaped groove, a ratchet and the like in the one-way clutch mechanism can be arranged on the piston and can also be arranged on the air cylinder. The piston may be disposed inside the cylinder or outside the cylinder. The passageway can set up in fixing bolt, and fixing bolt surface directly communicates with each other with cylinder is inside, also can set up alone, and the crankcase is connected to one end, and inside the cylinder is connected to one end. It is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and that all other embodiments obtained by those skilled in the art without inventive work based on the embodiments of the present invention and all other embodiments obtained by various equivalent changes belong to the scope of the present invention.
Claims (9)
1. A chain saw with a chain automatically tensioned is characterized in that: the device comprises a guide plate, an engine, a cylinder, a piston, a channel, a one-way valve and a one-way clutch mechanism; the engine is a crankcase scavenged two-stroke engine, the cylinder is fixedly arranged on the outer side of the engine, the piston is arranged on the cylinder in a sliding fit manner, and one outward end of the piston abuts against the guide plate; the one-way clutch mechanism is arranged between the cylinder and the piston; the two ends of the channel are respectively communicated with the inside of a crankcase and the inside of the cylinder of the engine, and the one-way valve is installed in the channel.
2. A chain saw with automatic tensioning of the chain as recited in claim 1 wherein: the one-way clutch mechanism comprises a wedge-shaped groove, a roller arranged in the wedge-shaped groove, and an actuating element, wherein the maximum depth of the wedge-shaped groove is larger than the diameter of the roller, the minimum depth of the wedge-shaped groove is smaller than the diameter of the roller, and the actuating element pushes the roller to the direction with the minimum depth.
3. A chain saw with automatic tensioning of the chain as recited in claim 1 wherein: the one-way clutch mechanism comprises a groove, a friction block and a retainer, wherein the friction block and the retainer are arranged in the groove, the friction block is provided with a large diameter and a small diameter, the depth of the groove is larger than the small diameter of the friction block and smaller than the large diameter of the friction block, and the retainer enables the friction block to work in the groove in the large diameter.
4. The chain saw with automatic chain tensioning according to claim 1, wherein: the one-way clutch mechanism includes a pawl, a ratchet, and an elastic member that engages the pawl with the ratchet.
5. A chain saw with automatic tensioning of the chain as recited in claim 1 wherein: and one side of the one-way clutch mechanism is provided with an operation hole.
6. A chain saw with automatic tensioning of the chain as recited in claim 1 wherein: the engine is characterized by further comprising a fixing bolt, a threaded hole is formed in the outer wall of the engine, the fixing bolt is matched with the threaded hole, and the air cylinder is fixedly installed on the outer side of the engine.
7. A chain saw with automatic tensioning of the chain as recited in claim 1 wherein: the piston is provided with a pressure relief hole, the second one-way valve is arranged in the cylinder or in the piston to be communicated or cut off.
8. A chain saw with automatic tensioning of the chain as recited in claim 1 wherein: and a sealing device is arranged between the cylinder and the piston.
9. A chain saw with automatic tensioning of the chain as set forth in claim 6 wherein: and a sealing device is arranged between the cylinder and the engine or between the cylinder and the fixing bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640227.7A CN115104448B (en) | 2022-06-08 | 2022-06-08 | Chain saw with automatically tensioned chain |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640227.7A CN115104448B (en) | 2022-06-08 | 2022-06-08 | Chain saw with automatically tensioned chain |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115104448A true CN115104448A (en) | 2022-09-27 |
| CN115104448B CN115104448B (en) | 2023-04-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210640227.7A Active CN115104448B (en) | 2022-06-08 | 2022-06-08 | Chain saw with automatically tensioned chain |
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| Country | Link |
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| CN (1) | CN115104448B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3211186A (en) * | 1962-07-18 | 1965-10-12 | Stanley Works | Strapping tool |
| EP0046977A2 (en) * | 1980-09-02 | 1982-03-10 | Ulrich Bühler AG Sägen- und Maschinenmesserfabrik | Hydraulically actuated stretching device for stretching saw blades in a gang saw |
| US5730673A (en) * | 1995-12-13 | 1998-03-24 | Mercedes-Benz Ag | Hydraulic tensioning arrangement for tensioning flexible drive means for a camshaft |
| US20020056984A1 (en) * | 2000-10-12 | 2002-05-16 | Clas Jernstrom | Safety belt pretensioner and force limiter |
| US20070199321A1 (en) * | 2006-02-24 | 2007-08-30 | Honda Motor Co., Ltd. | Air intake structure for small watercraft |
| CN115234617A (en) * | 2022-04-21 | 2022-10-25 | 浙江派尼尔科技股份有限公司 | Chain saw capable of automatically tensioning chain |
-
2022
- 2022-06-08 CN CN202210640227.7A patent/CN115104448B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3211186A (en) * | 1962-07-18 | 1965-10-12 | Stanley Works | Strapping tool |
| EP0046977A2 (en) * | 1980-09-02 | 1982-03-10 | Ulrich Bühler AG Sägen- und Maschinenmesserfabrik | Hydraulically actuated stretching device for stretching saw blades in a gang saw |
| US5730673A (en) * | 1995-12-13 | 1998-03-24 | Mercedes-Benz Ag | Hydraulic tensioning arrangement for tensioning flexible drive means for a camshaft |
| US20020056984A1 (en) * | 2000-10-12 | 2002-05-16 | Clas Jernstrom | Safety belt pretensioner and force limiter |
| US20070199321A1 (en) * | 2006-02-24 | 2007-08-30 | Honda Motor Co., Ltd. | Air intake structure for small watercraft |
| CN115234617A (en) * | 2022-04-21 | 2022-10-25 | 浙江派尼尔科技股份有限公司 | Chain saw capable of automatically tensioning chain |
Non-Patent Citations (3)
| Title |
|---|
| "博士信箱" * |
| 张宏;罗伟;: "剖析单缸四气门发动机" * |
| 李巍: "帕萨特B5轿车常见故障分析" * |
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| Publication number | Publication date |
|---|---|
| CN115104448B (en) | 2023-04-18 |
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