Chain saw

Abstract

A chainsaw (100) comprises: a housing (10); a first motor (41) supported by the housing (10); a saw chain (21) driven by the first motor (41) to perform a cutting function; one end of the guide plate (23) is supported by the shell (10), and the guide plate (23) is used for supporting and guiding the saw chain (21); the oil pumping assembly (50) comprises an oil pump (51) for pumping a lubricant to lubricate the saw chain (21) or the guide plate (23) and an oil can (52) for storing the lubricant; a second motor (53) for driving the oil pump (51); the distance between the center of gravity of the first motor (41) and the center of gravity of the second motor (53) is less than or equal to 1 m.

Description

Chainsaw Technical Field

[0001] The present application relates to an electric tool, for example, to a chain saw. Background Art

[0002] A chainsaw is a garden tool that uses a power unit to drive the blade of a saw chain in transverse motion to cut wood or branches. For stable operation, effective lubrication between the guide bar and the saw chain is essential to reduce friction, which generates heat, reduces cutting efficiency, accelerates component wear, and consumes energy. To this end, most chainsaws are equipped with an oil pump assembly that delivers lubricant to the guide bar or saw chain for lubrication. This pump and the saw chain are driven by the same motor.

[0003] Summary of the Invention

[0004] The present application discloses a chain saw, comprising: a housing; a first motor supported by the housing; a saw chain driven by the first motor to perform a cutting function; a guide bar, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly, comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar and an oil pot for storing the lubricant; and also comprising a second motor for driving the oil pump; the distance between the center of gravity of the first motor and the center of gravity of the second motor is less than or equal to 1 m.

[0005] A chain saw comprises: a housing; a first drive unit supported by the housing; a saw chain driven by the first drive unit to perform a cutting function; a guide bar, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar and an oil pot for storing the lubricant; and further comprising: a second drive unit for driving the oil pump; the distance between the center of gravity of the first drive unit and the center of gravity of the second drive unit being less than or equal to 1 m.

[0006] A chain saw, comprising: a housing; a first motor supported by the housing; a saw chain driven by the first motor to perform a cutting function; a guide plate, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly, comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide plate and an oil pot for storing the lubricant; and further comprising: a second motor for driving the oil pump; the rated voltage of the first motor is U1, whose unit is V; the rated voltage of the second motor is U2, whose unit is V, and the product of the rated voltage U1 of the first motor and the rated voltage U2 of the second motor is less than or equal to 1000V 2A chain saw comprises: a housing; a first motor supported by the housing; a saw chain driven by the first motor to perform a cutting function; a guide bar, one end of which is supported by the housing for supporting and guiding the saw chain; an oil pump assembly comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar, an oil pot for storing the lubricant, and a second motor for driving the oil pump; the second motor or the oil pump being detachably mounted to the oil pot. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] FIG1 is a perspective view of a chain saw as a specific embodiment;

[0008] FIG2 is a perspective view of the chain saw in FIG1 with part of its housing disassembled;

[0009] FIG3 is a perspective view of the chain saw in FIG1 with the left housing disassembled;

[0010] FIG4 is an exploded view of the chain saw in FIG3 ;

[0011] FIG5 is a diagram showing the positional relationship between the center of gravity of the second motor and the oil outlet;

[0012] FIG6 is a perspective view of the oil pump assembly of the chain saw in FIG1 ;

[0013] FIG7 is an exploded view of the structure of the oil pump assembly in FIG6;

[0014] FIG8 is an exploded view of the structure of the oil pump in the oil pump assembly in FIG6 ;

[0015] FIG9 is a cross-sectional view of the oil pump in the oil pump assembly in FIG6 ;

[0016] FIG10 is a perspective view of the chain saw in FIG1 with the left housing and the oil pot disassembled;

[0017] FIG11 is a circuit system control block diagram as an embodiment;

[0018] FIG12 is a circuit system control block diagram as another embodiment;

[0019] 13 is a flow chart of a method for controlling the oil output of the oil pump assembly by the second controller;

[0020] 14 is a flow chart of another control method for controlling the oil output of the oil pump assembly by the second controller;

[0021] FIG15 is a flow chart of another control method for the second controller to control the oil output of the oil pump assembly. DETAILED DESCRIPTION

[0022] The present application is introduced below with reference to the accompanying drawings and embodiments.

[0023] It will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context (e.g., the term includes at least the degree of error associated with the measurement of the specific value, the tolerance associated with the specific value (e.g., manufacturing, assembly, use), etc.). Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms can refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Of course, numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances.

[0024] The embodiments of the present application improve the lubrication efficiency of the guide plate or saw chain and the transmission assembly of the chain saw, reduce the consumption of lubricant, ensure the compact structure of the entire machine, provide stability in the oil output of the oil pump assembly, and enhance the user experience.

[0025] As shown in Figures 1 to 4, a chainsaw 100 includes a housing 10, a saw chain 21, a sprocket 22 supported in the housing 10 and capable of driving the saw chain 21, and a guide plate 23 that supports and guides the saw chain 21. In some embodiments, the housing 10 includes a right housing 15 and a left housing 16. The right and left housings 15, when assembled in the left-right direction, form the housing 10 and define a first accommodating space 103. The housing 10 includes a main housing portion 17, which forms or is connected to a rear handle 11 for the user to grasp, and a front handle 12 for the user to lift and operate the chainsaw 100 in conjunction with the rear handle 11. In some embodiments, a switch for controlling the operation of the chainsaw 100 is connected to the rear handle 11. In some embodiments, the switch includes a first switch 111 and a second switch 112. The chainsaw 100 can only be activated when the user presses the first and second switches 111 and 112 simultaneously, thereby preventing accidents caused by the user accidentally touching the first switch 111 while holding the chainsaw 100. In some embodiments, the second switch 112 is generally used as a safety start switch, and the first switch 111 is generally used as a power-on and speed adjustment switch. It is understood that when using the chain saw 100, the user presses the second switch 112 with his thumb and presses the first switch 111 with his index or middle finger to start and adjust the speed.

[0026] The chainsaw 100 also includes a guard 13 disposed on the front side of the front handle 12. The guard 13 protects the user from being cut by the saw chain 21 due to the recoil force when operating the chainsaw 100. When the chainsaw 100 is in operation, some flying debris (e.g., sawdust) may scratch the surface of the user's hand while gripping the front handle 12.

[0027] The chainsaw 100 also includes a power supply device that provides the chainsaw 100 with the electrical energy required for operation. The power supply device 30 includes a battery pack, which is detachably connected to the joint 14 formed by the housing 10. It should be understood that the power supply device 30 is not limited to the scenario of using a battery pack, and can also be powered by AC power, AC power, and corresponding rectification, filtering and voltage regulation circuits to achieve power supply to various circuit elements. In some embodiments, the power supply device 30 includes multiple battery packs to provide the chainsaw 100 with a longer battery life and a larger power output. In some embodiments, the total energy of the power supply device 30 is greater than or equal to 20Wh. The maximum rated voltage of the power supply device 30 is set to be greater than or equal to 40V and less than or equal to 100V.

[0028] The chainsaw 100 also includes a first drive unit for outputting power. In this embodiment, the first drive unit includes at least a first motor 41. The first motor 41 is disposed within the main housing portion 17. In some embodiments, the first motor 41 has an output shaft 411. The output shaft 411 drives the sprocket 22 to rotate, which in turn drives the saw chain 21. The saw chain 21 wraps around the edge of the guide bar 23 and is guided in a circular motion by the guide bar 23. The guide bar 23 is generally arranged in a front-to-back direction, with one end supported by the housing 10 and the other end extending longitudinally out of the housing 10. For chainsaws 100 driven by the first motor 41, particularly those powered by direct current, the overall weight of the chainsaw 100 after the power supply 30 is installed is relatively heavy due to the inherent structural limitations of the chainsaw 100. To reduce user fatigue from prolonged operation of the chainsaw 100, the center of gravity of the chainsaw 100 should be positioned close to the front handle 12. In some embodiments, the first motor 41 and the saw chain 21 of the chain saw 100 are disposed at the front end of the chain saw 100. The power supply 30 is disposed at the rear end of the chain saw 100 relative to the first motor 41. The rear handle 11 is disposed above the power supply 30.

[0029] In some embodiments, the maximum output power of the first motor 41 is greater than or equal to 300 W. In some embodiments, the maximum output power of the first motor 41 is greater than or equal to 400 W. The rated voltage U2 of the first motor 41 is less than or equal to 56V.

[0030] In this embodiment, as shown in Figures 4 to 9 , the chainsaw 100 further includes an oil pump assembly 50 at least partially disposed within the first accommodation space 103 formed by the housing 10. The oil pump assembly 50 is used to lubricate the saw chain 21 or guide bar 23 of the chainsaw 100 to improve the cutting efficiency and lifespan of the chainsaw 100. In some embodiments, the oil pump assembly 50 includes an oil pump 51 for pumping lubricant to lubricate the saw chain 21 or guide bar 22, an oil reservoir 52 for storing the lubricant, and a second drive unit for driving the oil pump 51. In some embodiments, the second drive unit includes at least a second motor 53. The second motor 53 is disposed within the main housing portion 17. In some embodiments, the second drive unit further includes a solenoid valve, a ceramic piezoelectric pump, or other electrically powered motion device. In some embodiments, the maximum output power of the second motor 53 is greater than or equal to 0.5 W. In some embodiments, the maximum output power of the second motor 53 is greater than or equal to 1 W. In some embodiments, the rated voltage U2 of the second motor 53 is less than or equal to 12 V. The rated voltage of the first motor is U1, whose unit is V, and the rated voltage of the second motor is U2, whose unit is V. The product of the rated voltage U1 of the first motor and the rated voltage U2 of the second motor is less than or equal to 1000V. 2 In some embodiments, the product of the rated voltage U1 of the first motor 41 and the rated voltage U2 of the second motor is less than or equal to 800V. 2 Among them, V 2 It refers to the unit formed by multiplying voltage by voltage.

[0031] In this embodiment, the weight of the second motor 53 is greater than or equal to 200g. In some embodiments, the weight of the second motor 53 is greater than or equal to 300g. In some embodiments, the ratio of the weight of the first motor 41 to the second motor 53 is greater than or equal to 1.5. In some embodiments, the ratio of the weight of the first motor 41 to the second motor 53 is greater than or equal to 2.5. In some embodiments, the ratio of the weight of the first motor 41 to the second motor 53 is greater than or equal to 3.

[0032] In some embodiments, the oiler 52 includes a lid 521 and a body 522. The body 522 and lid 521 are threadedly connected. The body 522 is fixedly mounted in the housing 10 and contains oil to lubricate the saw chain 21. In this embodiment, the body 522 is fixedly mounted to the left housing 15 and is at least partially exposed from the left housing 15. To facilitate the user's inspection of the remaining oil level, the body 522 is provided with a maximum refueling level indicator and a minimum refueling level indicator, respectively, to remind the user of the maximum and minimum refueling levels. In this embodiment, the oiler 52 is located in front of the first motor 41 in the front-to-back direction. It will be appreciated that the oiler 52 can be positioned anywhere within the first accommodating space 103 depending on the internal structure of the chain saw. Alternatively, the oiler 52 can be positioned outside the first accommodating space 103, i.e., in an area outside the housing 10.

[0033] The oil pump 51 is connected to the oil reservoir 52 and, driven by the second motor 53, transfers lubricant from the oil reservoir 52 to the saw chain 21 or the guide bar 23. In some embodiments, the oil pump 51 is connected to an oil inlet pipe 511 and an oil outlet pipe 512. The oil inlet pipe 511 communicates with the oil reservoir 52, and the oil outlet pipe 512 has an oil outlet port 512a located near the guide bar 23. During operation of the oil pump assembly 50, the second motor 53 drives the oil pump 51. Under the action of the oil pump 51, the lubricant in the oil reservoir 52 flows through the oil inlet pipe 511, through the oil pump 51, and through the oil outlet pipe 512, before flowing out of the oil outlet port 512a. The oil outlet port 512a is connected to a guide member 512b. The lubricant flows out of the oil outlet port 512a and drips into the oil outlet 231 formed on the guide plate 23 through the guide member 512b. When the saw chain 21 rotates around the guide plate 23, it automatically takes away the lubricant dripping on the guide plate 23, thereby achieving a lubrication effect.

[0034] In this embodiment, as shown in Figure 5, the distance from the center of gravity G2 of the second motor 53 to the oil outlet 231 is L2, wherein the distance L2 is greater than or equal to 10 mm and less than or equal to 90 mm. In some embodiments, the distance from the center of gravity G2 of the second motor 53 to the oil outlet 231 is L2, wherein the distance L2 is greater than or equal to 15 mm and less than or equal to 70 mm. In some embodiments, the distance from the center of gravity G2 of the second motor 53 to the oil outlet 231 is L2, wherein the distance L2 is greater than or equal to 25 mm and less than or equal to 50 mm. In this way, by reasonably arranging the position of the second motor 53 inside the main housing portion 17, the position of the second motor 53 to the oil outlet 231 is relatively close, thereby improving the oil output efficiency of the oil pump assembly, and the overall structural arrangement is also relatively compact.

[0035] In some embodiments, a first transmission gear 531 and a second transmission gear 532 are further provided between the second motor 53 and the oil pump 51. The first transmission gear 531 is driven by the second motor 52, and the second transmission gear 532 is driven by the first transmission gear 531, thereby driving the electric pump 51. In this embodiment, a gear transmission is provided between the second motor 53 and the oil pump 51 because the oil pump 51 does not require a high rotational speed. By providing a gear transmission, the rotational speed output by the second motor is reduced, thereby facilitating the selection and design of the second motor. Of course, those skilled in the art may also employ a method in which the second motor 53 directly drives the oil pump 51.

[0036] In this embodiment, the oil pump 51 can be of various types, such as a peristaltic pump, a diaphragm pump, a plunger pump, a vane pump, or a gear pump. Due to the advantages of plunger pumps, such as high rated pressure, compact structure, high efficiency, and convenient flow rate regulation, a plunger pump is selected in this embodiment to improve the operational stability of the oil pump assembly 50. Of course, those skilled in the art may also adopt other types of oil pumps during design. The following briefly describes the operation of the oil pump assembly 50.

[0037] The oil pump 51 comprises a cylinder 513, a piston 514 disposed within the cylinder 513, and a rotating shaft 515 for driving the piston 514. The cylinder 513 has an oil inlet 513a and an oil outlet 513b. The oil inlet 513a is connected to the oil inlet pipe 511, while the oil outlet 513b is connected to the oil outlet pipe 512. The piston 514 is generally cylindrical and is driven by the rotating shaft 515 to reciprocate within the cylinder 513 along the first axis 101. The rotating shaft 515 is driven by the second transmission gear 532 to rotate about the first axis 101. In some embodiments, a limiting groove 515a is formed on the rotating shaft 515, and a limiting hole 514c is formed on the piston 514. A fixing pin 514d is disposed in the limiting hole 514c. One end of the fixing pin 514d is connected to the piston 514, and the other end of the fixing pin 514d is disposed in the limiting groove 515a and is movable within the limiting groove 515a along the extending direction of the limiting groove 515a. When the rotating shaft 515 rotates about the first axis 101 under the drive of the second transmission gear 532, the fixing pin 514d, under the action of the limiting groove 515a, drives the piston 514 to reciprocate along the first axis 101. The piston 514 and the rotating shaft 515 form an oil chamber 514a for containing lubricant. When the piston 514 reciprocates along the first axis 101, the volume of the oil chamber 514a changes accordingly. One end of the rotating shaft 515 also has a cut surface 515b. When the cut surface 515b of the rotating shaft 515 is aligned with the oil inlet hole 513a, the oil pot 52 is connected to the oil chamber 514a. At this point, the piston 514 moves in a first direction, and lubricant is drawn from the oil pot 52 through the oil inlet pipe 511 into the oil chamber 514a under the action of air pressure. As the rotating shaft 515 continues to rotate, the cut surface 515b becomes dislocated from the oil inlet hole 513a, and the oil drawing process ends. When the cut surface 515b rotates until it faces the oil outlet hole 513b, the rotating shaft 515 begins to move in a second direction. Under the action of air pressure, the lubricant in the oil chamber 514a flows through the oil outlet hole 513a into the oil outlet pipe 512, and ultimately flows out of the oil outlet port 512a, completing the oil discharge process. As the rotating shaft 515 rotates, the oil pump assembly 50 continuously completes the operations of sucking and discharging oil, thereby achieving lubrication of the saw chain 21 and the guide bar 23 .

[0038] The oil pump assembly 50 operates as follows: the second motor 53 drives the first transmission gear 531 to rotate about an axis parallel to the first axis 101, thereby driving the second transmission gear 532 to rotate. The second transmission gear 532 drives the rotating shaft 515 to rotate about the first axis 101, and the rotating shaft 515 drives the piston 514 to reciprocate along the first axis 101. When the piston 514 moves in the first direction a, the oil pump assembly 50 enters an oil-sucking state. When the piston 514 moves in the second direction, the oil pump assembly 50 enters an oil-discharging state.

[0039] In this embodiment, the second motor 53 drives the oil pump 51 using a direct drive or a low-speed ratio transmission structure. In some embodiments, when the oil output of the oil pump assembly 50 is 10 mL / min, the average speed of the rotating shaft 515 of the oil pump 51 driven by the second motor 53 is greater than or equal to 100 rad / min. In some embodiments, when the oil output of the oil pump assembly 50 is 10 mL / min, the average speed of the rotating shaft 515 of the oil pump 51 driven by the second motor 53 is greater than or equal to 120 rad / min.

[0040] The above describes the working mode of an embodiment of the oil pump in this application, namely, a plunger pump, but those skilled in the art should understand that plunger pumps of other structural forms or other types of oil pumps can also be used to achieve the function of pumping oil.

[0041] In some embodiments, the oil pump assembly 50 further includes a motor housing 54 defining a second accommodation space 543 for accommodating the second motor 53 and at least a portion of the oil pump 51. In some embodiments, the motor housing 54 includes a first portion 541 and a second portion 542 defining the second accommodation space, with the first portion 541 and the second portion 542 being assembled together by screw fastening. In this embodiment, the first portion 541 of the motor housing 54 is integrally formed with the oil pot 52. It is understood that the motor housing 54 can also be a standalone structure, fixedly mounted to the oil pot 52. Thus, by installing the oil pump assembly 50, comprising the oil pump 51, oil pot 52, second motor 53, and motor housing 54, as a single unit within the housing 10, the structure within the housing 10 becomes more compact, the lubricant flow path is shortened, and lubrication efficiency is improved. Furthermore, when the oil pump assembly 50 is integrated, assembly and disassembly are simplified, reducing costs and subsequent maintenance.

[0042] As shown in Figure 10 , in this embodiment, the first motor 41 and the second motor 53 are disposed within the first accommodation space 103, with the first motor 41 positioned rearward of the second motor 53 in the front-to-back direction. In some embodiments, at least a portion of the first motor 41 or the second motor 53 is positioned between the front handle 12 and the rear handle 11 in the front-to-back direction. In this embodiment, the first motor 41 has a center of gravity G1, and the second motor 53 has a center of gravity G2. The distance L1 between the centers of gravity G1 and G2 is less than or equal to 1 meter. In some embodiments, the distance L1 between the centers of gravity G1 and G2 is less than or equal to 0.7 mm. In some embodiments, the distance L1 between the centers of gravity G1 and G2 is less than or equal to 0.4 mm. Thus, the rational arrangement of the first motor 41 and the second motor 53 within the first accommodation space 103 can make the overall structure of the chainsaw 100 more compact. In this embodiment, the length of the second motor 53 is less than or equal to 50 mm.

[0043] In this way, by rationally arranging the positions of the first motor 41 and the second motor 53, the overall structure is made compact while also simplifying the layout of the oil circuit and improving oil pumping efficiency. In this embodiment, the length of the oil outlet pipe 512 is greater than or equal to 50 mm. In some embodiments, the length of the oil outlet pipe 512 is greater than or equal to 70 mm.

[0044] In some embodiments, the oil pump 51, second motor 53, and motor housing 54 may not be mounted on the oil pot 52. In some embodiments, the oil pump 51, second motor 53, and motor housing 54 are mounted between the first motor 41 and the rear handle 11. In some embodiments, the oil pump 51, second motor 53, and motor housing 54 are mounted within the accommodation space formed by the rear handle 11. Of course, the oil pump assembly 50 may also be mounted behind the first motor 41 or at another location.

[0045] In some embodiments, a gearbox with a variable transmission ratio is disposed between the second motor 53 and the oil pump 51. Adjusting the transmission ratio of the gearbox changes the oil output of the oil pump. In some embodiments, a switch for adjusting the transmission ratio of the gearbox is disposed on the housing 10. By operating the switch, the user controls the rotation speed of the rotating shaft 515, thereby controlling the oil output of the oil pump assembly 50.

[0046] As shown in Figures 4 and 11 , the normal operation of the chainsaw 100 also relies on a circuit system. In some embodiments, the chainsaw 100 further includes a circuit board assembly 60 disposed within the first accommodation space 103. The circuit board assembly 60 is electrically connected to at least the first motor 41 and the second motor 53 for controlling the rotation of the first motor 41 and the second motor 53. In some embodiments, the circuit board assembly 60 includes a first controller 61 and a second controller 62. The first controller 61 is electrically connected to the first motor 41 for controlling the operation of the first motor 41. The second controller 62 is electrically connected to the second motor 53 for controlling the operation of the second motor 53. In some embodiments, the chainsaw 100 further includes a detection device 63 for detecting the state of the lubricant flowing through the oil inlet pipe 511 or the oil outlet pipe 512. In some embodiments, the detection device 63 can be a sensor. In this embodiment, the detection device 63 is mounted near the oil outlet pipe 512. The second controller 62 is connected to the detection device 63 for real-time detection of the state of the lubricant flowing through the oil outlet pipe 512. The second controller 62 is configured to transmit a first signal to the first controller 61 upon receiving the oil shortage signal from the detection device 63. The first controller 61 is configured to control the speed of the first motor based on the received first signal. In this embodiment, the first controller 61 and the second controller 62 are disposed on the same circuit board. Alternatively, the first controller 61 and the second controller 62 may be the same controller.

[0047] In some embodiments, as shown in FIG12 , the circuit board assembly includes a first circuit board assembly 60a and a second circuit board assembly 60b. A first controller 61a is provided on the first circuit board assembly 60a for controlling the operation of the first motor 41. A second controller 62b is provided on the second circuit board assembly 60b for controlling the operation of the second motor 53. In this embodiment, the first circuit board assembly 60a and the second circuit board 60b are installed separately. As an embodiment, the second circuit board assembly 60b is fixedly mounted on the oil pump assembly 50 and is integrally formed with the oil pump assembly 50 and can be detachably removed from the first accommodating space 103.

[0048] When cutting a workpiece, the user adjusts the speed of the first motor 41 of the chainsaw 100 based on the actual working conditions, thereby adjusting the cutting speed. When the chainsaw 100 cuts at a faster speed, more lubricant is required. Conversely, when the chainsaw 100 cuts at a slower speed or when cutting for a short period of time, relatively less lubricant is required. To facilitate adjusting the oil output of the oil pump assembly 50 to suit user needs, the chainsaw 100 in this embodiment also includes an oil quantity adjustment device 64 for adjusting the speed of the second motor 53. It will be understood that the faster the speed of the second motor 53, the greater the oil output of the oil pump assembly 50. Of course, the slower the speed of the second motor 53, the less oil output of the oil pump assembly 50. It should be noted that the above-mentioned oil output refers to the oil output of the oil pump assembly 50 per unit time, that is, the oil output per minute from the oil outlet port 512a.

[0049] In some embodiments, the oil quantity adjustment device 64 can be located on the housing 10 for user operation. In some embodiments, the oil quantity adjustment device 64 can be located on the rear handle 11 so that the user can more conveniently operate the speed adjustment device 64 to adjust the current oil output of the chain saw 100 while operating the chain saw 100 for cutting. Of course, the oil quantity adjustment device 64 can also be located elsewhere on the chain saw 100. In this embodiment, the oil quantity adjustment device 64 is configured as a button, knob, or other form.

[0050] In some embodiments, the chain saw 100 does not require a detection device for detecting the state of the lubricant. In some embodiments, the second controller 62 is configured to obtain operating parameters of the second motor 53 and control the speed of the first motor 41 or the second motor 53 based on the obtained operating parameters. The operating parameters of the second motor 53 include, but are not limited to, operating current, speed, and torque. The second motor 53 is used to drive the oil pump 51 to transfer lubricant from the oil pot 52 to the guide bar 23. It will be appreciated that when the lubricant in the oil pot 52 is low or depleted, the operating parameters of the second motor 53 will change. For example, the operating current of the second motor 53 will increase, the speed will decrease, and the torque will increase. Therefore, the state of the lubricant in the oil pot, i.e., the presence or absence of lubricant, can be determined based on the real-time operating parameters of the second motor 53.

[0051] A method for controlling the oil output of a chain saw will be described below with reference to FIG. 13 . The method comprises the following steps:

[0052] S10: Start the second motor.

[0053] S11: Obtain the change in the operating current of the second motor.

[0054] S12: Determine whether the change in the operating current of the second motor is greater than or equal to a preset first current threshold. If so, execute step S13; if not, execute step S11.

[0055] S13: Turn off the first motor and the second motor.

[0056] In this way, by setting the first current threshold, it is possible to directly determine whether the lubricant in the oiler is exhausted. When the lubricant is exhausted, the first motor and the second motor are turned off, thereby ensuring that the saw chain does not operate without lubricant, further extending the life of the saw chain and the guide bar.

[0057] Another control method for adjusting the oil output of a chain saw will be described below with reference to FIG. 14 . The method comprises the following steps:

[0058] S20: Start the second motor.

[0059] S21: Obtain the change in the operating current of the second motor.

[0060] S22: Determine whether the change in the operating current of the second motor is greater than or equal to a preset second current threshold. If so, execute step S23; if not, execute step S21;

[0061] S23: Control the first motor or the second motor to decelerate.

[0062] S24: Determine whether the change in the operating current of the second motor is greater than or equal to a preset first current threshold. If so, execute step S25; if not, execute step S21;

[0063] S25: Turn off the first motor and the second motor.

[0064] Unlike the above-mentioned embodiment, in this embodiment, a first current threshold and a second current threshold are set, wherein the first current threshold is greater than the second current threshold. When the change in the operating current of the second motor reaches the second current threshold, the speed of the first motor or the second motor is limited, thereby limiting the flow of lubricant out of the oil pump. When the change in the operating current of the second motor is greater than or equal to the first current threshold, the first motor and the second motor are turned off. In this way, while ensuring that the saw chain does not operate in a lubricant-free state, it can also effectively prevent the chain saw from suddenly stopping due to lack of oil, causing inconvenience to the user's cutting operation. When the user is normally controlling the chain saw to perform a cutting operation, if the oil output is found to be sharply reduced, it can be obtained that the lubricant in the oil tank is about to run out, and the cutting operation can be ended as soon as possible to replenish the lubricant.

[0065] It should be noted that the above control method uses only the operating current of the second motor as an example. Other operating parameters can also be used, such as the change in the speed and torque of the second motor. Of course, it is also possible to control the operation of the first and second motors by combining different operating parameters, such as the change in the operating current and torque of the second motor. Any operating parameters related to the second motor that can be listed by a person skilled in the art are intended to be included within the scope of protection of this application.

[0066] In some embodiments, the second controller 62 is configured to: obtain the working parameters of the power supply device, and control the speed of the first motor 41 or the second motor 53 based on the obtained working parameters. The working parameters of the power supply device include but are not limited to the power supply current or the power supply voltage. The second motor 53 is used to drive the oil pump 51 to transfer the lubricant in the oil pot 52 to the guide plate 23. It can be understood that when the lubricant in the oil pot 52 is less or empty, the power supply current or power supply voltage output by the power supply device will change. For example, when the lubricant in the oil pot is used up, the power supply current or power supply voltage of the power supply device will increase. Therefore, the state of the lubricant in the oil pot, that is, whether there is lubricant or not, can be determined by the real-time working parameters of the above-mentioned power supply device.

[0067] The oil pump in an oil pump assembly often suffers from machining errors and wears out over time, which can easily lead to unstable oil output. For example, the oil output of the oil pump assembly may decrease or increase, or the pump may discharge oil while simultaneously receiving oil, thus reducing pumping efficiency. Next, we will introduce a control method for an oil pump assembly that can adaptively adjust the oil output.

[0068] In some embodiments, the oil pump assembly 50 has the function of adaptively adjusting the oil output. It should be understood that the oil output in this embodiment is not regulated by an oil quantity adjustment device. In some embodiments, the second controller is configured to: control the activation of the second motor and drive the second motor to operate at a preset speed; obtain the time it takes for the oil pump assembly to transition from a first state to a second state, and set the preset speed of the second motor based on the obtained time. When the oil pump assembly is in the first state, the lubricant in the oil tank is full; when the oil pump assembly is in the second state, the lubricant in the oil tank is depleted.

[0069] In some embodiments, when the time acquired by the second controller is greater than or equal to a first time threshold, the preset speed of the second motor is increased; and when the time acquired by the second controller is less than a second time threshold, the preset speed of the second motor is decreased, where the second time threshold is less than or equal to the first time threshold.

[0070] Another control method for adjusting the oil output of a chain saw will be described below with reference to FIG. 15 . The method comprises the following steps:

[0071] S30: Start the second motor.

[0072] S31: Determine whether the oil pump assembly is in the first state. If so, execute step S32; if not, control the second motor to run at a preset speed.

[0073] S32: Start timing.

[0074] S33: Control the second motor to run at a preset speed.

[0075] S34: Determine whether the oil pump assembly is in the second state. If so, execute step S35; if not, execute step S33.

[0076] S35: Turn off the second motor.

[0077] S36: Acquire the running time of the oil pump component.

[0078] S37: Determine whether the running time is greater than a preset first time threshold. If so, execute step S38; if not, execute step S39.

[0079] S38: Increasing the preset rotation speed of the second motor.

[0080] S39: Determine whether the running time is less than a preset second time threshold. If so, execute step S310; if not, maintain the preset speed of the second motor unchanged.

[0081] S310: Reduce the preset speed of the second motor.

[0082] In this way, by measuring the time it takes for the lubricant in the oiler to go from full to depleted, the oil pump assembly's oil output is adaptively adjusted, ensuring a stable output. In this embodiment, the second motor's preset speed is set to maintain an oil pump assembly output of approximately 10 mL / min. This stable output ensures the user-estimated run time of the oiler, thereby ensuring cutting efficiency and the life of the guide chain and other components.

[0083] In some embodiments, the chainsaw 100 also has an oil output memory function to facilitate adaptation to user habits. In some embodiments, the chainsaw 100 also has a storage unit for storing the speed of the second motor 53 before power failure. The second controller is configured to receive a power-on signal from the second motor, query the second motor speed in the storage unit, and control the activation of the second motor based on the speed.

[0084] In some embodiments, the oil pump assembly 50 has at least a first operating mode and a second operating mode. In some embodiments, when the oil pump assembly 50 is in the first operating mode, the second motor 53 continuously drives the oil pump 51 to continuously output lubricant to the guide plate. When the oil pump assembly 50 is in the second operating mode, the second motor 53 intermittently drives the oil pump 51 to intermittently output lubricant to the guide plate. It is understood that when the user needs to operate the chain saw 100 for a long time or a fast cutting operation, the first operating mode can be selected to ensure that the chain and guide plate of the chain saw 100 are always in a well-lubricated state. When the user needs to operate the chain saw 100 for a short time or a low-speed cutting operation, the second operating mode can be selected to ensure the lubrication effect while avoiding wasting lubricant.

[0085] In some embodiments, the chainsaw further includes a temperature sensor for detecting the temperature of the guide bar or saw chain. Because the temperature of the guide bar or saw chain rises during the chain saw's cutting process when the cutting speed is high or the cutting time is long, more lubricant should be supplied to the guide bar or chain. In some embodiments, the second controller detects the guide bar or saw chain temperature via the temperature sensor and adjusts the speed of the second motor or the oil output of the oil pump assembly based on the detected temperature. It is understood that when the temperature is low, the speed of the second motor can be reduced, thereby reducing the oil output of the oil pump assembly. When the temperature is high, the speed of the second motor can be increased, thereby increasing the oil output of the oil pump assembly. Of course, when the oil pump assembly is in the second operating mode, the second motor intermittently drives the oil pump to intermittently deliver lubricant to the guide bar. The second controller detects the guide bar or saw chain temperature via the temperature sensor and adjusts the oil pump assembly's intermittent oil output period based on the detected temperature, thereby regulating the oil output of the oil pump assembly. It should be noted that the first controller and the second controller can be two different controllers, or they can be the same controller.

[0086] In some embodiments, the chainsaw further includes a pressure sensor for sensing the force applied by the user to the chainsaw. The pressure sensor can be installed on the rear handle or on the front handle. When the load is large during the cutting process of the chainsaw, the force applied by the user to the chainsaw will also increase accordingly. In some embodiments, the second controller obtains the force applied by the user to the chainsaw through the pressure sensor, and adjusts the rotation speed of the second motor or the oil output of the oil pump assembly based on the obtained force. It can be understood that when the force applied by the user to the chainsaw increases, the rotation speed of the second motor can be increased, thereby increasing the oil output of the oil pump assembly. When the force applied by the user to the chainsaw decreases, the rotation speed of the second motor can be reduced, thereby reducing the oil output of the oil pump assembly.

[0087] The above are only some embodiments of the present application. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application.

Claims

1. A chain saw comprising: case; a first motor supported by the housing; a saw chain driven by the first motor to perform a cutting function; a guide plate, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar and an oil pot for storing the lubricant; The chain saw further comprises: a second motor for driving the oil pump; A distance between a center of gravity of the first motor and a center of gravity of the second motor is less than or equal to 1 m.

2. The chain saw according to claim 1, wherein The housing includes a left housing and a right housing for forming a first accommodation space. The first motor and the second motor are disposed in the first accommodation space. In a front-to-rear direction, the first motor is located behind the second motor.

3. The chain saw according to claim 2, wherein: The shell is also connected or formed with a front handle and a rear handle for the user to hold, the front handle is close to the guide plate, and the rear handle is away from the guide plate; at least part of the first motor or the second motor is located between the front handle and the rear handle in the front-to-back direction.

4. The chain saw according to claim 3, wherein The oil pump assembly also includes an oil inlet pipe and an oil outlet pipe connected to the oil pump, the oil inlet pipe is connected to the oil pot, and the oil outlet pipe has an oil outlet port arranged near the guide bar and the saw chain; the second motor drives the oil pump to transfer the lubricant in the oil pot to the oil outlet port to drip onto the oil outlet on the saw chain or the guide bar.

5. The chain saw according to claim 4, wherein The length of the oil outlet pipe is less than or equal to 50 mm.

6. The chain saw according to claim 1, wherein The maximum output power of the first motor is greater than or equal to 300W; the maximum output power of the second motor is greater than or equal to 0.5W.

7. The chain saw according to claim 6, wherein: The second motor directly drives the oil pump or drives the oil pump at a low speed ratio, and the weight of the second motor is less than or equal to 200g.

8. The chainsaw according to claim 4 further comprises a circuit board assembly, on which a first controller or a second controller is arranged; the first controller is connected to the first motor for controlling the rotation of the first motor; the second controller is connected to the second motor for controlling the rotation of the second motor. 9 . The chain saw according to claim 8 , further comprising a detection device connected to the second controller, for detecting a state of the lubricant flowing through the oil inlet pipe or the oil outlet pipe.

10. The chain saw according to claim 9, wherein The first controller is configured to control a state of the first motor based on the state of the lubricant acquired by the second controller.

11. The chain saw according to claim 1, wherein The oil pump includes a peristaltic pump, a diaphragm pump, a plunger pump, a vane pump or a gear pump.

12. The chain saw according to claim 1, further comprising a power supply device, wherein the power supply device comprises at least one battery pack; the battery pack is detachably connected to the housing and is used to provide electrical energy for at least the first motor and the second motor.

13. The chain saw according to claim 12, wherein The capacity of the battery pack is set to be greater than or equal to 20Wh; the maximum rated voltage of the battery pack is set to be greater than or equal to 40V and less than or equal to 100V.

14. The chain saw according to claim 8, further comprising an adjustment device for user operation, wherein the adjustment device is connected to the circuit board assembly and is used to adjust at least the rotation speed of the first motor or the second motor.

15. The chain saw according to claim 14, wherein The second controller is configured to control the rotation speed of the second motor based on a trigger signal output by the regulating device, thereby controlling the oil output of the oil pump assembly.

16. A chain saw comprising: case; a first drive unit supported by the housing; a saw chain driven by the first drive unit to perform a cutting function; a guide plate, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar and an oil pot for storing the lubricant; The chain saw further comprises: a second driving unit for driving the oil pump; A distance between a center of gravity of the first drive unit and a center of gravity of the second drive unit is less than or equal to 1 m.

17. The chain saw according to claim 16, wherein The first driving unit includes a first motor; the second driving unit includes a second motor or a solenoid valve.

18. The chain saw according to claim 17, wherein The housing includes a left housing and a right housing for forming a first accommodation space. The first motor and the second motor are disposed in the first accommodation space. In a front-to-rear direction, the first motor is located behind the second motor.

19. The chain saw according to claim 18, wherein The shell is also connected or formed with a front handle and a rear handle for the user to hold, the front handle is close to the guide plate, and the rear handle is away from the guide plate; at least part of the first motor or the second motor is located between the front handle and the rear handle in the front-to-back direction.

20. The chain saw according to claim 19, wherein The oil pump assembly also includes an oil inlet pipe and an oil outlet pipe connected to the oil pump, the oil inlet pipe is connected to the oil pot, and the oil outlet pipe has an oil outlet port arranged near the guide plate and the saw chain; the second motor drives the oil pump to transfer the lubricant in the oil pot to the oil outlet port to drip onto the oil outlet on the saw chain or the guide plate; the length of the oil outlet pipe is less than or equal to 50 mm.

21. A chain saw comprising: case; a first motor supported by the housing; a saw chain driven by the first motor to perform a cutting function; a guide plate, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar and an oil pot for storing the lubricant; The chain saw further comprises: A second motor for driving the oil pump; the rated voltage of the first motor is U1, in V; the rated voltage of the second motor is U2, in V, and the product of the rated voltage U1 of the first motor and the rated voltage U2 of the second motor is less than or equal to 1000V 2 .

22. The chain saw according to claim 21, wherein The product of the rated voltage U1 of the first motor and the rated voltage U2 of the second motor is less than or equal to 800V 2 .

23. The chain saw of claim 21, wherein The rated voltage of the first motor is less than or equal to 56V, and the rated voltage of the second motor is less than or equal to 12V.

24. The chain saw of claim 21, wherein A ratio of the weight of the first motor to the weight of the second motor is greater than or equal to 1.

5.

25. The chain saw of claim 21, wherein The maximum weight of the second motor is less than or equal to 300 g.

26. The chain saw of claim 21, wherein The maximum weight of the second motor is less than or equal to 200 g.

27. The chain saw of claim 21, wherein The maximum output power of the first motor is greater than or equal to 300W; the maximum output power of the second motor is greater than or equal to and less than or equal to 1W.

28. The chain saw of claim 21, wherein The maximum output power of the first motor is greater than or equal to 400W; the maximum output power of the second motor is greater than or equal to and less than or equal to 0.5W.

29. The chain saw of claim 21, wherein When the second motor drives the oil pump to operate, the oil output of the oil pump is approximately 10 mL / min.

30. The chain saw of claim 21, wherein When the second motor drives the oil pump to operate, the oil output of the oil pump is approximately 10 mL / min, and the rotation speed of the second motor is greater than or equal to 100 rad / min.

31. The chain saw of claim 21, wherein The oil pump includes a peristaltic pump, a diaphragm pump, a plunger pump, a vane pump or a gear pump.

32. A chain saw comprising: case; a first motor supported by the housing; a saw chain driven by the first motor to perform a cutting function; a guide plate, one end of which is supported by the housing and is used to support and guide the saw chain; an oil pump assembly comprising an oil pump for pumping lubricant to lubricate the saw chain or the guide bar, an oil tank for storing the lubricant, and a second motor for driving the oil pump; Wherein, the second motor or the oil pump is mounted to the oil pot.

33. The chain saw of claim 32, wherein: The oil pump assembly and the first motor are disposed on the same side of the guide plate in the left-right direction.

34. The chain saw of claim 33, wherein: The oil pump and the second motor are disposed between the guide plate and the oil pot in the left-right direction.

35. The chain saw of claim 32, wherein The oil pot forms or is connected to a motor housing for forming a second accommodation space, and the oil pump and the second motor are arranged in the second accommodation space.

36. The chain saw of claim 32, wherein The oil pump assembly also includes an oil inlet pipe and an oil outlet pipe connected to the oil pump, the oil inlet pipe is connected to the oil pot, the oil outlet pipe has an oil outlet port arranged near the guide plate and the saw chain, and the length of the oil outlet pipe is less than or equal to 50 mm.

37. The chain saw of claim 32, wherein: The oil pump assembly further includes a circuit board assembly at least for controlling the rotation of the second motor, and the circuit board assembly is detachably connected to the oil pot.

38. The chain saw of claim 32, wherein: When the second motor drives the oil pump to operate, the oil output of the oil pump is approximately 10 mL / min.

39. The chain saw of claim 38, wherein When the second motor drives the oil pump to operate, the oil output of the oil pump is approximately 10 mL / min, and the rotation speed of the second motor is greater than or equal to 100 rad / min.

40. The chain saw of claim 32, wherein: The oil pump includes a peristaltic pump, a diaphragm pump, a plunger pump, a vane pump or a gear pump.

41. The chain saw according to claim 32, further comprising a power supply device, wherein the power supply device comprises at least one battery pack; the battery pack is detachably connected to the housing and is used to provide electrical energy for at least the first motor and the second motor.

42. A chain saw comprising: a main housing portion forming or having a rear handle connected thereto; a first motor supported by the main housing portion; a saw chain driven by the first motor to perform a cutting function; a guide plate, one end of which is supported by the main housing portion and is used to support and guide the saw chain; an oil pump assembly, comprising an oil pump for pumping lubricant to an oil outlet to lubricate the saw chain or the guide bar, and an oil pot for storing the lubricant; The chain saw further comprises: a second motor for driving the oil pump, the second motor being disposed within the main housing portion; A distance L2 between the center of gravity G2 of the second motor and the oil outlet is greater than or equal to 10 mm and less than or equal to 90 mm.

43. The chain saw of claim 42, wherein: The oil pump assembly also includes an oil inlet pipe and an oil outlet pipe connected to the oil pump, the oil inlet pipe is connected to the oil pot, and the oil outlet pipe has an oil outlet port arranged near the guide bar and the saw chain; the second motor drives the oil pump to transfer the lubricant in the oil pot to the oil outlet port to drip onto the oil outlet on the saw chain or the guide bar.

44. The chain saw of claim 43, wherein: The length of the oil outlet pipe is less than or equal to 50 mm.

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