Chain saw
阅读说明:本技术 一种链锯 (Chain saw ) 是由 李夏子 于 2019-10-18 设计创作,主要内容包括:本发明提供了一种链锯,包括壳体、动力系统、导板、链条以及张紧所述链条的张紧装置,所述导板设置有受力件;所述张紧装置包括旋钮、与所述受力件相配合的驱动件以及设置于所述旋钮和驱动件之间的力矩传递组件;所述力矩传递组件被配置为:当所述链条处于松弛状态时,所述力矩传递组件将所述旋钮的旋转运动传递给所述驱动件,以通过所述驱动件、受力件的配合驱动所述导板移动而张紧所述链条;当所述链条处于张紧状态时,所述力矩传递组件自身或者所述力矩传递组件与所述旋钮/驱动件之间发生打滑,从而停止传递力矩。相较于现有技术,本发明链锯的张紧装置不仅可以张紧链锯的链条,而且可以在张紧链条的同时固定导板,结构简单、可靠性高。(The invention provides a chain saw, which comprises a shell, a power system, a guide plate, a chain and a tensioning device for tensioning the chain, wherein the guide plate is provided with a stressed part; the tensioning device comprises a knob, a driving piece matched with the stressed piece and a torque transmission assembly arranged between the knob and the driving piece; the torque transfer assembly is configured to: when the chain is in a slack state, the torque transmission assembly transmits the rotation movement of the knob to the driving piece so as to drive the guide plate to move through the matching of the driving piece and the force-bearing piece to tension the chain; when the chain is under tension, slippage occurs between the torque transfer assembly itself or the torque transfer assembly and the knob/driver, thereby stopping the transfer of torque. Compared with the prior art, the tensioning device of the chain saw can not only tension the chain of the chain saw, but also fix the guide plate while tensioning the chain, and has simple structure and high reliability.)
1. A chain saw comprising a housing, a power system mounted on the housing, a guide plate mounted on the housing and slidable along the housing, a chain arranged on the guide plate and drivable by the power system for reciprocating movement, and a tensioning device for tensioning the chain, the guide plate being provided with a force-receiving member; the method is characterized in that:
the tensioning device comprises a knob, a driving piece matched with the stressed piece and a torque transmission assembly arranged between the knob and the driving piece; the torque transfer assembly is configured to:
when the chain is in a slack state, the torque transmission assembly transmits the rotation movement of the knob to the driving piece so as to drive the guide plate to move through the matching of the driving piece and the force-bearing piece to tension the chain;
when the chain is under tension, slippage occurs between the torque transfer assembly itself or the torque transfer assembly and the knob/driver, thereby stopping the transfer of torque.
2. The chain saw as recited in claim 1, wherein: the torque transmission assembly includes:
the side, away from the knob, of the tripping block is provided with a plurality of first end teeth;
one end of the elastic element abuts against the knob, and the other end of the elastic element abuts against the trip block; and
the gear set is matched with the driving piece to drive the driving piece to move, and a second end tooth matched with the first end tooth is arranged on the gear set;
when the chain is in a tensioned state, slippage occurs between the first end teeth and the second end teeth.
3. The chain saw as recited in claim 2, wherein: the gear set comprises a sun gear which is pivotally connected to the knob and at least one planet gear which is pivotally connected to the driving member; the knob is cylindrical, and the inner wall of the knob is provided with an inner gear ring matched with the planetary gear; the second end tooth is located on a side of the sun gear facing the trip block.
4. The chain saw as recited in claim 2, wherein: the side of the knob, which faces the trip block, is provided with a first abutting piece, and the trip block is provided with a second abutting piece matched with the first abutting piece, so that the trip block can be driven by the knob to rotate.
5. The chain saw as recited in claim 4, wherein: the first abutting piece is a protrusion, and the second abutting piece is a groove matched with the protrusion.
6. The chain saw as recited in claim 1, wherein: the force-receiving member includes a protrusion; the driving piece is provided with a spiral guide rail matched with the protrusion.
7. The chain saw as recited in claim 6, wherein: the stress element comprises at least two protrusions, and the distance between the two protrusions is not smaller than the width of the spiral guide rail.
8. The chain saw as recited in claim 1, wherein: the stress piece is a protrusion; the driving piece is provided with a propping wall matched with the protrusion, and the cross section of the propping wall is an involute curve.
9. The chain saw as recited in claim 8, wherein: the driving piece is a single cam or a double cam.
10. The chain saw as recited in claim 1, wherein: the knob is pivotally mounted on the housing and configured to: when the knob is turned, the knob is synchronously moved in a direction approaching the housing to further clamp or maintain the existing clamping force to secure the guide plate.
Technical Field
The present invention relates to a chain saw, and more particularly to a chain tensioner for a chain saw.
Background
A chainsaw is a garden tool that uses a chain with blades to rotate the chain at high speed through a power system to cut wood or tree branches. If the chain is slack, the chain may jump off the guide plate causing injury to the operator; if the chain is too tight, the chain may fail at high temperatures due to excessive friction with the guide plates. Furthermore, as the usage time increases, the chain wears, so that the chain gradually loosens and the tension gradually decreases.
Existing chain tensioning methods fall into two broad categories. One is that one or more special tools are required to directly or indirectly rotate the adjusting screw and tighten the clamping nut; this configuration requires the user to carry the adjustment tool with him and is inconvenient to use. The other type of the chain tensioning device does not need tools, and the chain tensioning device directly rotates a handle or a knob by hands to drive a series of adjusting structures to respectively tension the chain and fix the guide plate; however, such handles or knobs are usually provided with an outer knob and an inner knob, the tensioning chain being stepped in two steps: the first step is chain tensioning and the second step is guide plate compacting. Such step-by-step operation brings inconvenience to the user in assembly and also makes the structure relatively complicated.
In view of the above, there is a need for a chain saw to solve the above problems.
Disclosure of Invention
The invention aims to provide a chain saw, wherein a tensioning device of the chain saw can not only tension a chain of the chain saw, but also has simple structure, high reliability, firmness and durability, and can fix a guide plate while tensioning the chain.
To achieve the above object, the present invention provides a chain saw including a housing, a power system mounted on the housing, a guide plate mounted on the housing and slidable along the housing, a chain provided on the guide plate and drivable by the power system to reciprocate, and a tensioning device tensioning the chain, the guide plate being provided with a force receiving member; the tensioning device comprises a knob, a driving piece matched with the stressed piece and a torque transmission assembly arranged between the knob and the driving piece; the torque transfer assembly is configured to: when the chain is in a slack state, the torque transmission assembly transmits the rotation movement of the knob to the driving piece so as to drive the guide plate to move through the matching of the driving piece and the force-bearing piece to tension the chain; when the chain is under tension, slippage occurs between the torque transfer assembly itself or the torque transfer assembly and the knob/driver, thereby stopping the transfer of torque.
As a further improvement of the present invention, the torque transmission assembly includes: the side, away from the knob, of the tripping block is provided with a plurality of first end teeth; one end of the elastic element abuts against the knob, and the other end of the elastic element abuts against the trip block; the gear set is matched with the driving piece to drive the driving piece to move, and a second end tooth matched with the first end tooth is arranged on the gear set; when the chain is in a tensioned state, slippage occurs between the first end teeth and the second end teeth.
As a further improvement of the present invention, the gear set includes a sun gear pivotally mounted on the knob and at least one planet gear pivotally mounted on the driving member; the knob is cylindrical, and the inner wall of the knob is provided with an inner gear ring matched with the planetary gear; the second end tooth is located on a side of the sun gear facing the trip block.
As a further improvement of the present invention, a first abutting piece is disposed on a side of the knob facing the trip block, and the trip block is provided with a second abutting piece matched with the first abutting piece, so that the trip block can be driven by the knob to rotate.
As a further improvement of the present invention, the first abutting member is a protrusion, and the second abutting member is a groove engaged with the protrusion.
As a further improvement of the present invention, the force receiving member includes a protrusion; the driving piece is provided with a spiral guide rail matched with the protrusion.
As a further improvement of the invention, the force-bearing part comprises at least two protrusions, and the distance between the two protrusions is not smaller than the width of the spiral guide rail.
As a further improvement of the present invention, the force receiving member is a protrusion; the driving piece is provided with a propping wall matched with the protrusion, and the cross section of the propping wall is an involute curve.
As a further development of the invention, the drive element is a single cam or a double cam.
As a further improvement of the present invention, the knob is pivotally mounted on the housing and configured to: when the knob is turned, the knob is synchronously moved in a direction approaching the housing to further clamp or maintain the existing clamping force to secure the guide plate.
The invention has the beneficial effects that: the tensioning device of the chain saw can not only tension the chain of the chain saw, but also fix the guide plate while tensioning the chain, and has the advantages of simple structure, high reliability, firmness and durability.
Drawings
Fig. 1 is a schematic perspective view of a chain saw according to the present invention.
FIG. 2 is a perspective view of the chain saw of FIG. 1 with a portion of the housing removed.
Fig. 3 is an exploded perspective view of the tensioner.
Fig. 4 is a perspective view of the knob.
Fig. 5 is a perspective view of the driving member.
Fig. 6 is a perspective view of the trip block.
Figure 7 is a schematic view of a second embodiment of the drive member.
Figure 8 is a schematic view of a third embodiment of the drive member.
Fig. 9 is an exploded perspective view of a second embodiment tensioner.
Fig. 10 is a perspective view of the knob in the tensioning device of fig. 9.
Fig. 11 is a cross-sectional schematic view of the tensioner of fig. 9.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and 2, the present invention discloses a chain saw 100, which includes a
Referring to fig. 1 and 2, the
Referring to fig. 2, a
Referring to fig. 3, the tensioning device 40 includes a
Referring to fig. 4 and 3, the
Fig. 7 shows another embodiment of a drive member 42'. The driving member 42 'is provided with an abutting wall 421' which cooperates with the protrusion. The section of the retaining wall 421 'in the axial direction perpendicular to the driving member 42' is an involute curve, that is: the point on the curve is at progressively greater distances from the axis of the driver 42'. Fig. 8 shows another embodiment of a
Referring to fig. 3 and 6, the torque transmission assembly 43 includes a
When the
Fig. 9 shows another embodiment of a
When the
The present invention details two embodiments of the torque transmission assembly to transmit torque when the
Compared with the prior art, the
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:高性能小切口锯链