CN220571067U - Hand-held chain saw - Google Patents

Abstract

The utility model proposes a hand-held chain saw comprising: a housing in which a motor is installed; the transmission assembly comprises a driving wheel, a driven wheel and an output shaft, wherein the driving wheel is connected with the motor, the output shaft is arranged in the shell, and the driven wheel is arranged on the output shaft; the cutting assembly is connected with the output shaft, and the motor drives the transmission assembly to drive the cutting assembly to work; the driving wheel is a cylindrical gear, the teeth of the driven wheel are arranged on the end face of the driven wheel, and the meshing surface of the driving wheel and the driven wheel is a plane. According to the utility model, the driving wheel in the transmission assembly is designed as the cylindrical gear, the driving wheel is meshed with the driven wheel, and the meshing surface of the driving wheel is a plane, so that the influence of axial errors of the driving wheel is eliminated, the matching precision of the driving wheel and the driven wheel is improved, the problems of gear noise, tooth clamping, tooth jumping, slipping or abrasion and the like are prevented, and the motor is quite simple and convenient to assemble in the machine under the structure of the transmission assembly.

Description

Hand-held chain saw

Technical Field

The utility model belongs to the technical field of electric tools, and particularly relates to a handheld chain saw.

Background

In the conventional field, in work such as forest cutting, lumbering, pruning, etc., a chain saw is widely used as one of the most common cutting devices, but the chain saw adopts a gasoline engine as a driving part, and is inconvenient to carry, too large in size, and inconvenient to use.

The utility model discloses an electric chain saw among the prior art, thereby drive the chain rotation through adopting group battery to drive motor power supply, but among the prior art, the motor in the electric chain saw is accomplished fixedly through front end support and rear end bearing and control casing cooperation generally, under this assembly method, because shrinkage ratio and certain assembly error of plastics casing to and axial float etc. of motor itself all can lead to having axial error on driving tooth and the driven tooth fit clearance, thereby produces gear noise, latch and jump tooth scheduling problem.

Disclosure of Invention

In view of the above drawbacks of the prior art, the present utility model aims to provide a handheld chain saw, so as to eliminate the influence of axial errors of a driving wheel, improve the precision of matching between the driving wheel and a driven wheel, and prevent the problems of gear noise, teeth locking, tooth jumping, slipping or wearing, etc.

To achieve the above and other related objects, the present utility model provides a hand-held chain saw comprising:

the shell is internally provided with a motor;

the transmission assembly comprises a driving wheel, a driven wheel and an output shaft, wherein the driving wheel is connected with the motor, the output shaft is arranged in the shell, and the driven wheel is arranged on the output shaft;

the cutting assembly is connected with the output shaft, and the motor drives the transmission assembly to drive the cutting assembly to work;

the driving wheel is a cylindrical gear, the teeth of the driven wheel are arranged on the end face of the driven wheel, and the meshing surface of the driving wheel and the driven wheel is a plane.

In one embodiment of the utility model, the housing comprises a first housing and a second housing, bearing mounting positions are arranged in the first housing and the second housing, bearings are arranged at two ends of the output shaft, and the bearings are positioned in the bearing mounting positions.

In one embodiment of the utility model, the motor comprises a motor bracket fixedly connected with the first shell and the second shell through fixing screws.

In one embodiment of the present utility model, the motor includes a motor bracket, and the first housing and the second housing have motor bracket mounting slots formed therein, and the motor bracket is positioned in the motor bracket mounting slots.

In one embodiment of the utility model, the driven wheel is a crown gear.

In one embodiment of the present utility model, the cutting assembly further comprises a protection plate, wherein one end of the protection plate is rotatably connected with the top of the shell and is located above the cutting assembly.

In one embodiment of the utility model, a groove is formed in the top of the housing, the groove is located at one end of the housing near the cutting assembly, and one end of the protection plate is located in the groove.

In one embodiment of the utility model, a lubrication device is also included, the lubrication device being mounted on the output shaft, the lubrication device including an automatic oil discharge pump having an oil outlet directed toward the cutting assembly.

In one embodiment of the utility model, the motor is an external rotor motor, the diameter of the motor is set between 30mm and 40mm, and the length of the iron core of the motor is set between 20mm and 40 mm.

In one embodiment of the utility model, the weight of the whole machine of the hand-held chain saw is set between 1kg and 1.1 kg.

The utility model provides a handheld chain saw, which is characterized in that a driving wheel in a transmission assembly is designed into a cylindrical gear, the driving wheel is meshed with a driven wheel, and the meshing surface of the driving wheel is a plane, so that the influence of axial errors of the driving wheel is eliminated, the matching precision of the driving wheel and the driven wheel is improved, the problems of gear noise, clamping teeth, tooth jump, slipping or abrasion and the like are prevented, and the motor is quite simple and convenient to assemble in the machine under the structure of the transmission assembly.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of a hand-held chain saw according to an embodiment of the present utility model.

FIG. 2 is a schematic view of another angle of the hand-held chain saw according to one embodiment of the present utility model.

Fig. 3 is a schematic view illustrating an internal structure of a hand-held chain saw according to an embodiment of the present utility model.

Fig. 4 is a schematic view of a brush motor and a transmission assembly according to an embodiment of the present utility model.

Fig. 5 is an exploded view of a transmission assembly according to an embodiment of the present utility model.

Fig. 6 is a schematic structural diagram of a brushless motor according to an embodiment of the utility model.

Fig. 7 is a schematic structural diagram of a housing when a brushless motor is installed in an embodiment of the utility model.

Fig. 8 is a schematic view of a structure of a housing in which a brush motor is installed in an embodiment of the present utility model.

Fig. 9 is an exploded view of a first shielding plate according to an embodiment of the present utility model.

Fig. 10 is a schematic view of a first housing of a hand-held chain saw according to an embodiment of the present utility model.

FIG. 11 is a schematic view of the housing cavity of the hand-held chain saw in an embodiment of the present utility model.

Fig. 12 is a schematic view of a mounting structure of a brushless PCB according to an embodiment of the utility model.

Fig. 13 is a schematic view of a mounting structure of a Printed Circuit Board (PCB) with brushes according to an embodiment of the utility model.

Fig. 14 is a schematic view of a slot structure in a handle housing according to an embodiment of the utility model.

Fig. 15 is a schematic diagram illustrating the installation of a brushless motor and a brushless PCB according to an embodiment of the utility model.

Fig. 16 is a schematic diagram of the installation of a brush motor and a brush PCB in an embodiment of the utility model.

Fig. 17 is a schematic view showing a partial structure of a cutter chain in a hand-held chain saw according to an embodiment of the present utility model.

Fig. 18 is a partial top view of a knife chain in a hand-held chain saw in accordance with one embodiment of the present utility model.

Description of the reference numerals:

100. a hand-held chain saw; 10. a housing; 20. a drive assembly; 30. a transmission assembly; 40. a power supply assembly; 50. a cutting assembly; 11. a first housing; 12. a second housing; 101. a center housing; 102. a motor housing; 103. a handle housing; 1031. a receiving chamber; 1032. a first positioning rib; 1033. second positioning ribs; 104. a brushless PCB board; 105. a brushed PCB; 10331. a reinforcement is arranged; 10332. a lower rib position; 21. a brushless motor; 22. a brush motor; 23. a heat radiation fan; 1021. an air outlet; 1034. an auxiliary air inlet; 202. a cable; 2021. wire clamping groove; 2022. a first wire guiding groove; 2023. a second wire guiding groove; 31. a driving wheel; 32. driven wheel; 33. an output shaft; 34. a bearing; 106. bearing installation position; 24. a motor bracket; 25. a set screw; 14. a semi-limit groove; 15. a motor bracket mounting groove; 151. convex ribs; 107. a first protection plate; 1071. a groove; 1072. a rotating shaft; 1073. a torsion spring; 1074. a bushing; 1075. a gasket; 108. a second protection plate; 51. a knife plate.

Detailed Description

Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model.

It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present utility model by way of illustration, and only the components related to the present utility model are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.

Referring to fig. 1 to 18, the present utility model proposes a hand-held chain saw to eliminate the influence of axial errors of a driving wheel, improve the precision of matching between the driving wheel and a driven wheel, and prevent gear noise, teeth, tooth jump, slipping or abrasion, etc., in particular, the hand-held chain saw 100 includes a housing 10, a driving assembly 20, a transmission assembly 30, a power supply assembly 40 and a cutting assembly 50, wherein the driving assembly 20 and the transmission assembly 30 are disposed in the housing 10, the cutting assembly is disposed at the front side of the housing 10, and the driving assembly 20 is connected with the transmission assembly 30, meanwhile, the transmission assembly 30 is connected with the cutting assembly, the driving assembly 20 drives the transmission assembly 30, and further drives the cutting assembly to perform cutting work, the power supply assembly 40 is electrically connected with the driving assembly 20, and the power supply assembly 40 is externally connected with a power supply or a battery pack.

Referring to fig. 1, 2, 3 and 5, in this embodiment, the housing 10 includes a first housing 11 and a second housing 12, the first housing 11 and the second housing 12 are fixedly connected together to form a housing cavity, a driving assembly 20 and a transmission assembly 30 are installed in the housing cavity, the driving assembly 20 is a motor, for example, the motor is an external rotor brushless motor, and the motor is installed in the housing 10.

Referring to fig. 1, 6 and 7, in the present embodiment, the motor includes a motor bracket 24, and the motor bracket 24 is fixedly connected to the first housing 11 and the second housing 12 through a fixing screw 25. In this embodiment, the motor bracket 24 may be configured as a square plate, for example, a fixing screw 25 may be fixed on the square plate, after fixing a cylindrical head of the fixing screw 25 in the housing 10, that is, by the action between the first housing 11 and the second housing 12, to fix the fixing screw 25 in a snap fit manner, so as to achieve the fixing of the motor, for example, a half-limit groove 14 is provided on the inner sides of the first housing 11 and the second housing 12, and when the first housing 11 and the second housing 12 are fixedly mounted, the two half-limit grooves 14 on the inner sides of the first housing 11 and the second housing 12 are combined to form a complete limit hole, and the fixing screw 25 is snapped into the limit hole to achieve the fixing. It should be noted that, the motor may be an external rotor brushless motor.

Referring to fig. 1, 4, 5 and 8, in another embodiment, the first housing 11 and the second housing 12 are formed with a motor bracket mounting groove 15, the motor bracket 24 is located in the motor bracket mounting groove 15, for example, ribs 151 are formed on upper and lower sides of the motor bracket mounting groove 15, and upper and lower sides of the motor bracket 24 are respectively contacted with the ribs 151, that is, the upper and lower sides of the motor bracket 24 are limited by the ribs 151 on the upper and lower sides of the motor bracket mounting groove 15, and the left and right sides are limited by the first housing 11 and the second housing 12, respectively, so as to fixedly mount the motor in the housing 10. The motor is, for example, a brush motor or an inner rotor brushless motor, wherein the motor bracket 24 of the brush motor may be configured as an integral structure with the motor.

Referring to fig. 1, 2, 3 and 5, in the present embodiment, the transmission assembly 30 includes a driving wheel 31, a driven wheel 32 and an output shaft 33, the driving wheel 31 is connected with the motor, the output shaft 33 is installed in the housing 10, and the driven wheel 32 is installed on the output shaft 33 and is meshed with the driving wheel 31. In this embodiment, the driving wheel 31 is, for example, a cylindrical gear, the teeth of the driven wheel 32 are designed on the end surface of the driving wheel, that is, the tooth trace of the driven wheel 32 is located on the end surface of the driving wheel, and the driving wheel 31 is meshed with the driven wheel 32, and the meshing surface is a plane, so that a certain amount of movement of the driving wheel 31 in the axial direction is allowed, and the matching precision of the driving wheel and the driven wheel is improved. Of course, the driving wheel 31 may be a spur gear or a spur gear, the toothed line of which is preferably helical, the driven wheel 32 adopts a crown gear, preferably a crown gear, the toothed line of which is helical, the crown gear is meshed with the toothed line of which is a helical cylindrical gear, and the meshing surface of which is a plane, so that when the driving wheel 31 axially moves, the driving wheel 31 and the driven wheel 32 can be ensured to be automatically meshed, the matching precision of the driving wheel 31 and the driven wheel 32 is not affected by the axial error of the driving wheel 31, the assembly is simple, the matching precision of the driving wheel 31 and the driven wheel 32 is improved, and the problems of gear noise, jamming, tooth jump, slipping or abrasion and the like are prevented.

Referring to fig. 1, 7 and 8, in the present embodiment, bearing mounting locations 106 are disposed in the first housing 11 and the second housing 12, bearings 34 are mounted at two ends of the output shaft 33, and the bearings 34 are located in the bearing mounting locations 106 to ensure the mounting accuracy of the output shaft 33.

Referring to fig. 2 and 9, in this embodiment, the chain saw 100 further includes a first protection plate 107, the first protection plate 107 is disposed above the cutting assembly 50 and is adapted to the cutting assembly 50, and one end of the first protection plate 107 is rotatably connected to the top of the housing 10, so as to protect a user during a cutting process.

Referring to fig. 2 and 9, in this embodiment, a groove 1071 is formed at the top of the housing 10, the groove 1071 is located at one end of the housing 10 near the cutting assembly 50, one end of the first protection plate 107 is located in the groove 1071, specifically, a rotating shaft 1072 is disposed at one end of the first protection plate 107 rotationally connected with the housing 10, a torsion spring 1073 is sleeved on the rotating shaft 1072, both the rotating shaft 1072 and the torsion spring 1073 are located in the groove 1071, one end of the torsion spring 1073 is clamped on the first protection plate 107, and the other end of the torsion spring 1073 is clamped on the housing 10, so that automatic reset can be achieved under the action of the torsion spring 1073 after the first protection plate 107 rotates. In this embodiment, the rotation angle of the first protection plate 107 is limited by the housing 10, that is, when the first protection plate 107 contacts with the housing 10, a limit is generated, so as to prevent the first protection plate 107 from continuing to rotate, which has a simple structure and does not need other limit structures. In the present embodiment, the rotation angle of the first protection plate 107 is set between 0 ° and 110 °, wherein at 0 °, the first protection plate 107 is parallel to the knife plate in the cutting assembly 50. Further, since the first protection plate 107 is a movable part, and the first protection plate 107 is a safety protection, and needs sufficient structural strength, in this embodiment, a bushing 1074 is added to the first protection plate 107, the bushing 1074 is disposed between the rotating shaft 1072 and the protection plate 107, and the two are cooperatively rotated, thereby increasing service life and structural strength. In this embodiment, the rotating shaft 1072 is configured as a screw, and the bushing 1074 is disposed in the first protection plate 107, and the screw sequentially passes through the spacer 1075, the bushing 1074 and is connected with the housing 10 to mount the first protection plate 107 to the housing 10, and rotate under the cooperation of the bushing 1074.

Referring to fig. 2, in the present embodiment, the chain saw 100 further includes a second protection plate 108, and the second protection plate 108 is fixedly disposed at the bottom of the housing 10 and located below the handle housing 103 to protect a user during cutting. For example, the second protection plate 108 is an open handle protection plate, i.e. the handle protection plate extends from the casing, and the other end thereof is hollow out to form an open state, so that the weight of the second protection plate can be reduced as small as possible under the condition of meeting safety regulations, and the handle protection plate is open and convenient to hold, has comfortable hand feeling and no binding feeling.

Referring to fig. 1, in this embodiment, the chain saw 100 further includes a lubrication device mounted on the output shaft 32, the lubrication device includes an automatic oil outlet pump, and an oil outlet of the automatic oil outlet pump is directed to the cutting assembly 50 to realize automatic lubrication, and of course, in other embodiments, the oil dropping bottle may be adapted to manually drip oil on the chain for lubrication.

Referring to fig. 1, in this embodiment, the motor is an external rotor motor, the diameter of the motor is between 30mm and 40mm, the length of the iron core of the motor is between 20mm and 40mm, the weight of the whole machine of the hand-held chain saw is between 1kg and 1.1kg, for example, when the motor is matched with a 4-inch knife chain of a knife board, the weight of the whole machine of the hand-held chain saw reaches between 1kg and 1.05 kg; when the motor is matched and installed with a 6-inch knife chain of the knife board, the whole weight of the hand-held chain saw reaches between 1.05kg and 1.1kg, and under the weight, the power peak value of the hand-held chain saw can reach 500w, and the linear speed of the knife chain can reach 8m/s, so that the chain saw has the characteristics of light weight, high power, high torque and high linear speed.

Referring to fig. 1, 3 and 10, in the present embodiment, the housing 10 includes a handle housing 103, and a battery pack is plugged into an end of the handle housing 103 to be connected with the power supply assembly 40 for providing a power source for the driving assembly 20. The bottom of the handle housing 103 is formed with a receiving cavity 1031, a PCB board is mounted in the receiving cavity 1031, specifically, positioning ribs for fixing the PCB board are disposed on a side wall of the receiving cavity 1031, for example, a first positioning rib 1032 is disposed on front and rear sides of the receiving cavity 1031, and a second positioning rib 1033 is disposed on the other two sides, where a side of the handle housing 103 close to the cutting assembly 50 is defined as a front side, and a side far away from the cutting assembly 50 is defined as a rear side. In this embodiment, the PCB may be a brushless PCB 104 or a brushed PCB 105, and when the PCB is a brushless PCB 104, the brushless PCB 104 is positioned by the first positioning ribs 1032 and fixed in the accommodating cavity 1031; when the PCB board is a brushed PCB board 105, the brushed PCB board 105 is positioned by the second positioning ribs 1033 and is fixed in the accommodating cavity 1031.

Referring to fig. 3 and fig. 10 to fig. 13, in this embodiment, because the wall thickness of the brushless PCB 104 is large, the first positioning ribs 1032 are used to fix the brushless PCB 104 in a surrounding manner; the wall thickness of the brushed PCB 105 is thinner, so the design that the side surface of the brushed PCB 105 is inserted into two ribs is adopted for fixing, namely, the second positioning rib 1033 comprises an upper rib position 10331 and a lower rib position 10332, a gap exists between the upper rib position 10331 and the lower rib position 10332, the brushed PCB 105 is inserted into the gap between the upper rib position 10331 and the lower rib position 10332, and the fixed mounting is realized through the cooperation of the upper rib position 10331 and the lower rib position 10332, namely, a containing cavity 1031 for installing the PCB is formed in the handle shell 103, and a first positioning rib 1032 for fixing the brushless PCB 104 and a second positioning rib 1033 for fixing the brush PCB 105 are respectively arranged on the side wall of the containing cavity, so that the handheld type of the motor can be adapted to the different types of the handheld type of the motor, and the applicability of the handheld type of the motor can be improved.

Referring to fig. 11, 14, 15 and 16, in this embodiment, the driving component 20 is a motor, which is installed in the motor housing 102, for example, when the PCB board is the brushless PCB board 104, the motor is a brushless motor 21, and when the PCB board is the brushed PCB board 105, the motor is a brushed motor 22, so that the handheld chain saw can be adaptively installed with the brush PCB board 105 and the brushless PCB board 104, and the corresponding motor is selected according to the type of the PCB board, so that the handheld chain saw can be adaptively matched with different types of motors, thereby improving the applicability of the handheld chain saw. It should be noted that, a cooling fan 23 is disposed at the tail of the motor, the cooling fan 23 is close to the top of the motor housing 102, and an air outlet 1021 is correspondingly disposed on the motor housing 102, when the cooling fan 23 is started, cooling air enters the motor housing 102 from the air inlet, flows through the motor, and flows out from the air outlet 1021, so as to achieve the heat dissipation effect on the motor.

Referring to fig. 3 and fig. 10 to fig. 13, in this embodiment, an auxiliary air inlet 1034 is disposed on the first housing 11 and the second housing 12 and corresponding to the accommodating cavity 1031, and the auxiliary air inlet 1034 is communicated with the accommodating cavity 1031, so that the brushed PCB and the brushless PCB can share the air inlet, thereby realizing auxiliary heat dissipation and natural heat dissipation of the PCB, and further improving the heat dissipation effect of the handheld chain saw 100.

Referring to fig. 11, 14, 15 and 16, in this embodiment, the motor and the PCB board are electrically connected by a cable 202, one end of the cable 202 is electrically connected to the PCB board, and the other end passes through the inside of the handle housing 103, extends into the motor housing 102, and is electrically connected to the motor. Specifically, a wire clamping groove 2021 is provided on an inner wall of a portion of the first housing 11 or the second housing 12 located on the handle housing 103, and the cable 202 is fixed in the wire clamping groove 2021.

Referring to fig. 11, 14, 15 and 16, in the present embodiment, when the motor is a brushless motor 21, the cable 202 is led out from the front side of the brushless motor 21 and connected to the brushless PCB 104, and at this time, a first lead groove 2022 is provided on the first housing 11 or the second housing 12 near the front side of the brushless motor 21, and at this time, the cable 202 extends from the front side of the brushless motor 21 to the direction of the brushless PCB 104 and sequentially passes through the first lead groove 2022 and the clip groove 2021; when the motor is a brushed motor 22, the cable 202 is led out from the rear side of the brushed motor 22 and connected to the brushed PCB 105, and at this time, a second lead groove 2023 is provided on the first housing 11 or the second housing 12 near the rear side of the brushed motor 22, and at this time, the cable 202 extends from the rear side of the brushed motor 22 to the direction of the brushed PCB 105 and sequentially passes through the second lead groove 2023 and the card slot 2021. It should be noted that, the first lead groove 2022, the second lead groove 2023 and the wire clamping groove 2021 are located on the first housing 11 or the second housing 12 at the same time, and the first lead groove 2022 and the second lead groove 2023 are located below the motor, that is, the wire clamping groove for fixedly connecting the cable between the PCB board and the motor and the wire clamping groove corresponding to different motors are disposed in the housing 10, so as to adapt to the cable routing of different motor types of wires, thereby avoiding danger or unreliability caused by messy cables.

Referring to fig. 1 to 3, 10, 17 and 18, in the present embodiment, the cutting assembly 50 includes a blade 51 and a cutter chain 52, one end of the blade 51 is connected with the housing 10, the cutter chain 52 is disposed around the blade 51, the cutter chain 52 includes guide teeth, the tooth thickness of the guide teeth is set between 0.04 inch and 0.05 inch, the pitch of the cutter chain is set between 0.2 inch and 0.4 inch, for example, the tooth thickness of the guide teeth is preferably 0.043 inch, and the pitch of the cutter chain is preferably 0.3 inch, i.e. the number of cutting teeth of the cutter chain with small pitch increases under the cutter chain with the same length, which is beneficial for improving the cutting efficiency. Further, the product rate of the cutter chain is set at 406mm ³ Up to 450mm ³ The product rate refers to the product of the height H of the cutter chain, the pitch of the cutter chain and the width W of the cutter chain, so that the cutting speed of the cutter chain is improved, and the cutter is suitable for rapid operation of small tools. Further, the blade of the cutter chain is preferably a right angle tooth or a small right angle tooth, so that the cutter chain has higher cutting speed and cutting efficiency. In this embodiment, the cutter chain preferably adopts a narrow-cut cutting edge, so that the weight is reduced, the rebound is reduced, the cutting efficiency is improved, and the cutting wood chip fibers are reduced.

The utility model provides a handheld chain saw, which is characterized in that a driving wheel in a transmission assembly is designed into a cylindrical gear, the driving wheel is meshed with a driven wheel, and the meshing surface of the driving wheel is a plane, so that the influence of axial errors of the driving wheel is eliminated, the matching precision of the driving wheel and the driven wheel is improved, the problems of gear noise, clamping teeth, tooth jump, slipping or abrasion and the like are prevented, and the motor is quite simple and convenient to assemble in the machine under the structure of the transmission assembly.

The foregoing description is only illustrative of the preferred embodiments of the present application and the technical principles employed, and it should be understood by those skilled in the art that the scope of the present application is not limited to the specific combination of the above technical features, but encompasses other technical features which may be combined with any combination of the above technical features or their equivalents without departing from the inventive concept, such as the technical features disclosed in the present application (but not limited to) and the technical features having similar functions are substituted for each other.

Other technical features besides those described in the specification are known to those skilled in the art, and are not described herein in detail to highlight the innovative features of the present utility model.

Claims (10)

1. A hand-held chain saw, comprising:

the shell is internally provided with a motor;

the transmission assembly comprises a driving wheel, a driven wheel and an output shaft, wherein the driving wheel is connected with the motor, the output shaft is arranged in the shell, and the driven wheel is arranged on the output shaft;

the cutting assembly is connected with the output shaft, and the motor drives the transmission assembly to drive the cutting assembly to work;

the driving wheel is a cylindrical gear, the teeth of the driven wheel are arranged on the end face of the driven wheel, and the meshing surface of the driving wheel and the driven wheel is a plane.

2. The hand-held chain saw as in claim 1, wherein the housing comprises a first housing and a second housing, bearing mounting locations are provided in the first housing and the second housing, bearings are mounted at both ends of the output shaft, and the bearings are located in the bearing mounting locations.

3. The hand-held chain saw as in claim 2, wherein the motor comprises a motor bracket fixedly connected to the first housing and the second housing by a set screw.

4. The hand-held chain saw as in claim 2, wherein the motor includes a motor bracket, the first housing and the second housing having a motor bracket mounting slot formed therein, the motor bracket being located in the motor bracket mounting slot.

5. The hand-held chain saw of claim 1, wherein the driven wheel is a crown gear.

6. The hand held chain saw as in claim 1, further comprising a guard plate having one end rotatably coupled to the top of the housing and positioned above the cutting assembly.

7. The hand held chain saw as in claim 6, wherein a groove is formed in a top of the housing and is located at an end of the housing near the cutting assembly, and an end of the guard plate is located within the groove.

8. The hand-held chain saw of claim 1, further comprising a lubrication device mounted on the output shaft, the lubrication device comprising an automatic oil pump having an oil outlet directed toward the cutting assembly.

9. The hand-held chain saw of claim 1, wherein the motor is an external rotor motor, the motor has a diameter of between 30mm and 40mm, and the motor has a core length of between 20mm and 40 mm.

10. The hand-held chain saw of claim 9, wherein the overall weight of the hand-held chain saw is between 1kg and 1.1 kg.