WO2016131412A1 - 动力工具 - Google Patents

动力工具 Download PDF

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Publication number
WO2016131412A1
WO2016131412A1 PCT/CN2016/073879 CN2016073879W WO2016131412A1 WO 2016131412 A1 WO2016131412 A1 WO 2016131412A1 CN 2016073879 W CN2016073879 W CN 2016073879W WO 2016131412 A1 WO2016131412 A1 WO 2016131412A1
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WO
WIPO (PCT)
Prior art keywords
bottom plate
rail
power tool
saw blade
fixing member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2016/073879
Other languages
English (en)
French (fr)
Inventor
陈国军
吉绍山
夏连明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Positec Power Tools Suzhou Co Ltd
Original Assignee
Positec Power Tools Suzhou Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Positec Power Tools Suzhou Co Ltd filed Critical Positec Power Tools Suzhou Co Ltd
Publication of WO2016131412A1 publication Critical patent/WO2016131412A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/16—Hand-held sawing devices with circular saw blades

Definitions

  • the invention relates to the field of power tools.
  • the existing power tools are generally electric circular saws, which are cut by a saw blade.
  • the slide rail portion of the existing electric saw blade is an action of cutting the saw blade downward by moving the bearing in the arc groove. Since the motion track during the saw blade cutting process is a circular arc, linear motion cannot be realized. When cutting downward, the operator needs to change the direction of the electric circular saw, so the electric circular saw has poor comfort in operation.
  • the power tool generally includes a saw blade for machining a workpiece, a body for accommodating the saw blade, a bottom plate for the workpiece and a bottom plate for passing the saw blade through the workpiece to cut the workpiece, and the body and the bottom plate generally rotate.
  • Connection, the saw blade and the fuselage of the power tool have a circular arc during the cutting process, so when the user grips the body to cut, the angle of the user's grip is constantly changing, resulting in more comfortable operation. difference.
  • the circular arc-shaped trajectory of the saw blade makes it difficult for the user to predict the final cutting position of the saw blade, and the position of the tool needs to be adjusted before and after the slot cutting. Increased difficulty in operation and requirements for operator experience and skill.
  • a power tool characterized in that the power tool comprises a fuselage, a cutting assembly and a connecting assembly; the cutting assembly comprises a saw blade for cutting a workpiece and a bottom plate for abutting against a surface of the workpiece when the workpiece is cut, A motor is provided in the fuselage for driving the saw blade to rotate, and the fuselage is linearly movably coupled to the bottom plate by the connecting assembly relative to the bottom plate.
  • the invention has the beneficial effects that when the user uses the power tool of the invention, the angle of the holding tool is kept unchanged, and the user does not need to change the holding direction, thereby improving the comfort of the user operation.
  • the movement trajectory of the saw blade is a straight line, so that the user can easily predict the cutting position of the saw blade, the operation difficulty and the low skill requirements for the operator.
  • the structure of the cutting width indication is used to indicate the cutting position of the saw blade, it is advantageous to simplify the setting of the cutting width indicating structure.
  • the connecting component comprises a fixing member fixedly connected to the fuselage and at least one fixedly connected to a guide rail of the bottom plate, the guide rail and the fixing member are relatively movable.
  • the guide rail is a guide post. Its orientation is better.
  • the guide rail is a cylindrical guide rail. This setup has the advantage of being easy to machine and assemble.
  • the connecting assembly comprises two rails, and the two rails are spaced apart on the bottom plate.
  • the plane formed by the longitudinally extending axes of the two guide rails is parallel to the plane in which the saw blade is located. This arrangement makes the structure more compact, reducing the size of the tool and making the tool more accessible.
  • a linear bearing is disposed between at least one of the two guide rails and the fixing member.
  • the provision of a linear bearing between the two makes the relative movement between the two smoother, avoiding the locking of the mechanism and improving the comfort of the user.
  • a linear bearing is disposed between the guide rail adjacent to the front end of the two guide rails and the fixing member.
  • the direction in which the rail and the fixing member move relative to each other is inclined with respect to the bottom plate.
  • the guide rail includes a first end fixedly connected to the bottom plate and a second end opposite to the first end, and the direction of advancement when cutting normally using the power tool is front, the first end Located on the front side of the second end.
  • an angle between the longitudinally extending axis of the guide rail and the bottom plate is 80° to 87°.
  • the angle between the longitudinally extending axis of the guide rail and the bottom plate is 82°. This setting can effectively prevent the rebound in the work process and improve the comfort and safety of the user operation.
  • the connecting assembly further includes a returning member that returns the bottom plate to an initial state away from the fixing member after the bottom plate is moved to a position close to the fixing member.
  • one end of the rail is fixedly connected to the bottom plate, and the other end of the rail is fixedly connected with an end cover through the fixing member, and one end of the returning member abuts the fixing member, and the other end of the returning member abuts Holding the end cover;
  • the rail includes a first rail and a second rail, the fixing member is provided with a first through hole and a second through hole, and the first rail and the second rail are fixedly connected at one end
  • the bottom plate, the other ends of the first rail and the second rail are fixedly connected to the end cover through the first through hole and the second through hole, respectively, and the returning member is located at the first end Between the rail and the second rail.
  • the end cover includes an end plate on a side of the fixing member away from the bottom plate and a receiving portion extending toward a side of the bottom plate
  • the fixing member includes a top plate adjacent to the end plate, the reply One end of the piece abuts the top plate and the other end abuts the bottom of the receiving portion.
  • the guide rail and the fixing member are perpendicular to the bottom plate in a direction of relative movement, the first rail and the first through hole are coarsely positioned, and the second rail and the second through hole are
  • the fixing member and The static friction coefficient between the guide rails is fs
  • the length of the fixing member and the second rail is H
  • the bottom plate is away from the connection direction of the first rail and the second rail.
  • the distance between the end of the second rail and the second rail is L, where H > 2 Lfs.
  • the two ends of the guide rail and the through hole are respectively provided with a first sealing member and a second sealing member to isolate the through hole from the outside.
  • the saw blade is located on a first side of the fuselage, and the connecting component is located on a second side of the fuselage opposite the first side.
  • This arrangement avoids the shielding of the saw blade by the guiding mechanism, facilitates the user to observe the exact cutting position of the saw blade during operation, improves the visibility, and sets the saw blade and the connecting component on both sides of the fuselage so that the center of gravity of the tool lies on the fuselage.
  • the center plane is either closer to the center plane, making the user more comfortable to hold during operation.
  • the cutting assembly further includes a lower shroud and an upper shroud, the lower shroud being coupled to the bottom plate and movable along with the bottom plate relative to the body, the lower shroud being disposed on the bottom cover
  • the saw blade is adjacent to a side of the bottom plate so as to cover the saw blade;
  • the connecting assembly can push the lower shroud together with the bottom plate in a direction away from the bottom plate relative to the fuselage Moving linearly to expose a portion of the saw blade;
  • the upper shroud is fixed relative to the fuselage and is disposed on a side of the saw blade away from the bottom plate to thereby integrate the entire body with the lower shroud
  • the saw blade covers; the connecting assembly can move the lower shroud into or out of the upper shroud relative to the fuselage when moving relative to the fuselage.
  • the fuselage includes a front end on which the cutting assembly is mounted and a rear end remote from the front end, the motor is located at a rear end of the fuselage, and an axis of a rotating shaft of the motor is perpendicular to the saw blade The axis of the axis of rotation.
  • the direction in which the power tool is normally used for cutting is forward, and the center of the saw blade moves forward relative to the bottom plate as the body moves toward the bottom plate.
  • a power tool characterized in that the power tool comprises a fuselage, a cutting assembly and a connecting assembly; the cutting assembly comprises a saw blade for cutting a workpiece and a bottom plate for abutting against a surface of the workpiece when the workpiece is cut, the motor is provided with a motor for driving the saw blade to rotate, and the fuselage is vertically movable relative to the bottom plate by the connecting assembly Connected to the backplane.
  • a power tool characterized in that the power tool comprises a fuselage, a cutting assembly and a connecting assembly; the cutting assembly comprises a saw blade for cutting a workpiece and a bottom plate for abutting against the surface of the workpiece when the workpiece is cut, the motor is provided with a motor for driving the saw blade to rotate, and the fuselage is linearly tilted relative to the bottom plate by the connecting assembly Groundly connected to the bottom plate.
  • FIG. 1 is a schematic structural view of an embodiment of a power tool according to the present invention.
  • Figure 2 is a perspective view of the power tool of Figure 1 in an initial state
  • Figure 3 is a perspective view showing the cutting state of the power tool shown in Figure 1;
  • FIG. 4 is a cross-sectional view of the connecting assembly of the power tool of FIG. 1 corresponding to FIG. 2 and FIG. 3 in two different states;
  • Figure 5 is a cross-sectional view of the power tool shown in Figure 2 taken along line A-A;
  • Figure 6 is a cross-sectional view of the power tool connecting assembly of Figure 1;
  • Figure 7 is a force analysis diagram of an embodiment of the power tool of the present invention.
  • Figure 8 is a force analysis diagram of another embodiment of the power tool of the present invention.
  • Figure 9 is a cross-sectional view of the power tool of Figure 1;
  • Figure 10 is a cross-sectional view of another angle of the power tool of Figure 1;
  • Figure 11 is a plan view of the power tool of Figure 1;
  • Figure 12 is a side view of the power tool of Figure 1;
  • Figure 13 is a front elevational view of the power tool of Figure 1;
  • Figure 14 is a plan view of the power tool of Figure 1 hidden behind the end cover;
  • Figure 15 is a front elevational view of a power tool according to another embodiment of the present invention.
  • Figure 16 is a schematic view showing the movement of the saw blade of the power tool shown in Figure 1;
  • Figure 17 is a schematic view showing the movement of the saw blade of the power tool shown in Figure 15;
  • connection assembly 400 motor 202 saw blade
  • a power tool 10 includes a fuselage 100, a cutting assembly 200, and a coupling assembly 300.
  • the cutting assembly includes a saw blade 202 for cutting a workpiece, and is used for cutting the workpiece.
  • a bottom plate 204 that depends on the surface of the workpiece.
  • a working motor 400 for driving the power tool 10 is provided in the body 100.
  • the motor 300 is used to drive the saw blade 202 to rotate to cut the workpiece.
  • the saw blade 202 is preferably a circular saw blade, and the saw blade 202 may be a abrasive pad with abrasive grains, a saw blade welded with a carbide tip, or a saw blade without a carbide tip.
  • the motor 400 is housed in the body 100.
  • the bottom plate 204 has an abutment surface 212 against the workpiece, and the bottom plate 204 is provided with a hole 210 through which the saw blade 202 passes during cutting. It is defined that the direction X in which the user normally uses the power tool for cutting is forward, and the opposite direction is rear X'. It is defined that the direction Y of the depression when the user normally uses the power tool for cutting is downward, and the opposite direction is the upper Y'.
  • FIG. 4 wherein the solid line position of FIG. 4 indicates a cross-sectional view of the connecting component when the power tool 10 is in an initial state, that is, when it is not in operation; the dotted line position indicates that the power tool 10 is in a cutting state, that is, when working.
  • a cross-sectional view of the component As shown in FIG. 2-4, when the user needs to use the power tool 10, the bottom plate 204 is generally pressed against the workpiece to be cut, and the body is pressed down in the Y direction, so that the bottom plate 204 moves relative to the body and the saw blade 210 passes from the hole.
  • the saw blade 210 Passing through 210, the saw blade 210 is rotated by the motor 400 to effect cutting of the workpiece to be cut, and the user can push the power tool 10 in the X direction to cut the power tool forward.
  • the bottom plate 204 and the body 100 move in opposite directions to return to the initial state.
  • the body 100 is linearly movably coupled to the base plate 204 by a connection assembly 300 relative to the bottom plate 204.
  • the body 100 is vertically movably coupled to the bottom plate 204 by the connection assembly 300 relative to the bottom plate 204, that is, the body 100 is linearly movably connected to the body 200 in a direction perpendicular to the bottom plate 204 by the connection assembly 300.
  • Base plate 204 It is also possible that the bottom plate 204 is coupled to the body 100 by the connection assembly 300 in a linearly movable manner relative to the saw blade 202 in a direction substantially perpendicular to the bottom plate 204.
  • connection group The piece 300 includes a fixture 332 and a connector 310.
  • the fixing member and the connecting member are relatively movable.
  • the connector 310 includes at least one rail 330 and an end cap 314 that are fixedly coupled to the bottom plate 204, and the rail 330 and the fixture 332 are relatively movable.
  • the guide rail 330 includes two guide rails, which are a first guide rail 330a and a second guide rail 330b, respectively.
  • the guide rail is a cylindrical member.
  • the fixing member 332a, 332b is fixedly coupled to the body 100.
  • the fixing member may be a combination of a plurality of parts or a part integrally formed.
  • the portion of the hole-shaped structure that cooperates with the first rail 330a is A fixing member 332a and a portion that cooperates with the hole-like structure of the second rail 330b are the second fixing members 332b.
  • the fixing member includes a hole-like structure and is disposed on the bottom plate, and the guide rail is also a column member provided on the body.
  • the first rail 330a and the first fixture 332a are coaxially coupled to each other along the longitudinally extending axis 328a of the first rail, and are relatively movable relative to each other along the axis 328a.
  • the second rail 330b and the second fixture 332b are coaxially engaged with each other along the longitudinally extending axis 328b of the second rail, and are relatively movable relative to each other along the axis 328b.
  • the first rail longitudinally extending axis 328a and the second rail longitudinally extending axis 328b are parallel to each other.
  • the direction in which both the fuselage 100 and the bottom plate 204 move relative to each other is also parallel to the longitudinally extending axes of the two guide rails.
  • the connection assembly 300 further includes an end cap 314 that is fixedly coupled to the first and second rails 330a, 330b. After the first rail 330a passes through the first fixing member 332a, it is fixedly connected to the end cover 314. After the second rail 330b passes through the second fixing member 332b, it is fixedly connected to the end cover 314.
  • the end cap 314 includes an end plate 316 on the side of the fixture 332 remote from the bottom plate 204. Specifically, the first and second rails 330a, 330b are fixedly coupled to the end plates 316 of the end caps.
  • the rails and the end plates 316 are fixedly coupled by screws 320.
  • the first embodiment of the first guide rail and the first and second fixing members are used for mutual guiding, it is also possible to use only one guide rail and one fixing member to guide each other. Of course, the use of two rails can greatly increase the stability of its movement.
  • the end cap 314 prevents the fixing member and the guide rail from being separated from each other.
  • the guide rails 330a, 330b are preferably guide posts, more preferably cylindrical guide rails. With this arrangement, it is more directional and easy to process and assemble.
  • the cutting assembly 200 further includes a lower shroud 208 and an upper shroud 206, the lower shroud 208 being coupled to the bottom plate 204, and the lower shroud 208 being slidable relative to the bottom plate 204 100 can be moved.
  • the lower shroud 208 is disposed on a side of the saw blade 202 adjacent to the bottom plate 204 so that the saw blade 202 can be covered.
  • the lower shroud 208 and the saw blade 202 are located together on a first side of the fuselage 100.
  • the connection assembly 300 can, with the bottom plate 204, push the lower shroud 208 linearly moving away from the bottom plate 204 relative to the body 100 to expose a portion of the saw blade 202.
  • the lower shroud 208 is configured to better protect the saw blade 202 and prevent the saw blade 202 from exposing the bottom plate 204 to the human body.
  • the upper shroud 206 is fixed relative to the body 100, and the upper shroud 206 is placed over the side of the saw blade 202 away from the bottom plate 204 to cover the entire saw blade 202 together with the lower shroud 208.
  • the saw blade 202, the lower shroud 208, and the upper shroud 206 of the cutting assembly 200 are all located on a first side of the body 100.
  • the connecting assembly 300 can move the lower shroud 208 into or out of the upper shroud 206 relative to the body 100 when moving relative to the body 100.
  • the upper shroud 206 further protects the saw blade 202 from damage to other objects by the saw blade 202 that is covered by the upper shroud 206, as well as preventing damage to the human body by the saw blade 202.
  • connection assembly 300 further includes a return member 380.
  • the returning member 350 can provide a resilient force when the power tool 10 returns from the cutting state to the initial state, so that the bottom plate 204 and the body 100 are away from each other, that is, the bottom plate 204 is moved to a position close to the fixing member 332, and the bottom plate 204 can be restored to a fixed distance.
  • the returning member 380 is disposed between the fixing member 332 and the connecting member 310, one end of which abuts the fixing member 332 and the other end abuts the connecting member 310. Specifically, it is located between the end cover 314 and the fixing member 332.
  • the return member 380 is a compression spring.
  • the fixture has a top plate 362 adjacent the end plate 316.
  • the end cap 314 includes a receiving portion 318 that extends toward one side of the bottom plate 204.
  • the return member 380 abuts against the top plate 362 at one end and abuts against the bottom of the receiving portion 318 at the other end.
  • the top plate 362 of the fixing member is movable up and down in the space formed by the receiving portion 318 and the end plate 316. Under the action of the return member 380, the top plate 362 and the end plate 316 abut each other, that is, when the power tool 10 is in the initial state shown in FIG.
  • the end cover 314 and the fixing members 332a, 332b abut each other.
  • the power tool 10 is in the cutting state shown in FIG. 3, and the user presses down the body, and during the relative movement of the bottom plate 204 and the body 100, the fixing member 332 fixedly connected to the body is opposite to the bottom plate 204.
  • the restoring force of the return member 380 pushes the opposite movement of the bottom plate 204 and the body 100 to return to the initial position, achieving automatic reset.
  • the connection assembly 300 further includes at least one linear bearing 418 disposed between the guide rail and the fixing member, that is, between at least one of the two guide rails.
  • a linear bearing is provided, that is, a linear bearing is disposed between the first rail 330a, the first fixing member 332a, and/or the second rail 330b and the second fixing member 332b.
  • the linear bearing 418 is disposed between the first rail 330a and the first fixture 332a.
  • the linear bearing 418 is disposed between the guide rail and the fixing member near the front end.
  • the fixing member 332 is provided with a first through hole and a second through hole, and the fixing member includes the first A portion of one of the through holes is the first fixing member 332a, and a portion including the second through hole is the second fixing member.
  • One end of the first rail 330a and the second rail 330b are fixedly connected to the bottom plate 204, and the other ends of the first rail 330a and the second rail 330b are respectively fixed through the first through hole and the second through hole, and the connecting end cover 314 is fixed.
  • the 380 is located between the first rail and the second rail.
  • the distance between the first guide rail 330a and the rotational axis of the saw blade 202 is substantially equal to the distance between the second guide rail 330b and the rotational axis of the saw blade 202.
  • the first sealing member 322 and the second sealing member 324 are respectively disposed at two ends of the rail and the through hole to isolate the through hole from the outside.
  • the first guide rail cooperates with the first through hole and the second guide rail and the second through hole cooperate, one of which is a coarse positioning and the other is a fine positioning.
  • the mutually cooperating guide rails and through holes are sliding friction.
  • the mutually cooperating guide rails and through holes are rolling friction, and the coarse positioning is larger than the fine positioning gap.
  • the sleeve 336a is coarsely positioned between the second rail 330a and the second fixing member 332a, and the first rail 330a and the first fixing member 332a are precisely positioned by the linear bearing 334b, and are passed through the linear bearing.
  • the static friction coefficient between the positioned second fixing member 332b and the second rail 330b is fs
  • the length of the second fixing member 332b and the second rail 330b is H
  • the bottom plate 204 is in the connecting direction of the first rail and the second rail.
  • the distance between the end portion away from the second rail 330b and the second rail 330b is L
  • the relationship between fs, H, and L satisfies the following relationship: H>2Lfs.
  • the first rail 330a and the first fixture 332a are precisely positioned by the linear bearing 334a
  • the second rail 330b and the second fixture 332b are coarsely positioned by the sleeve 336b.
  • the static friction coefficient between the first fixing member 332a and the first rail 330a precisely positioned by the linear bearing 418 is fs
  • the length of the first fixing member 332a and the first rail 330a is H
  • the bottom plate 204 is at the first rail and the second
  • the distance between the end portion of the guide rail in the connecting direction away from the first rail 330a and the second rail 330a is L
  • the above relationship f>, H, L satisfies the following relationship H>2Lfs.
  • the first rail 330a on the left side and the first fixture 332a are roughly positioned by the sleeve 336a.
  • the matching gap between the first positioning rail 330a and the first fixing member 332a is relatively large, that is, the matching gap between the first rail and the first through hole is large.
  • the second rail 330b located on the right side and the second fixing member 332b are positioned by the linear bearing precision 418b, and the matching gap between the finely positioned second rail 330b and the second fixing member 332b is small, that is, the second rail and the second rail
  • the matching clearance between the two through holes is small, and when the bottom plate 204 is stressed, the finely positioned second guide rail 330b is biased.
  • the force F of the workpiece on the bottom plate 204 is affected by
  • the force point is at the end of the bottom plate 204 near the coarsely positioned first rail 330a
  • L is the distance between the force receiving point of the bottom plate 204 and the finely positioned second rail 330b, that is, the bottom plate 204 is away from the finely positioned second along the saw blade direction X.
  • the second rail 330b and the second fixture 332b on the right side are roughly positioned by the sleeve 336b.
  • the matching gap between the coarsely positioned second rail 330b and the second fixing member 332b is large, that is, the matching gap between the second rail and the second through hole is large.
  • the coarse positioning second guide rail 330b is unstressed when deflected.
  • the first rail 330a located on the left side and the first fixing member 332a are precisely positioned by the linear bearing 334a, and the matching gap between the finely positioned first rail 330a and the first fixing member 332a is small, that is, the first rail and the first rail The fit clearance between the through holes is small.
  • the finely positioned first rail 330a is biased when deflected.
  • the force of the workpiece F against the bottom plate 204 is at the end of the bottom plate 204 near the coarsely positioned second rail 330b, and L is between the force receiving point of the bottom plate 204 and the finely positioned first rail 330a.
  • the distance, that is, the direction X on the bottom plate 204 is away from the distance between the end of the finely positioned first rail 330a to the finely positioned first rail 330a.
  • first rail and the second rail are respectively engaged with the fixing member through the first through hole and the second through hole, and when the thrust point of the bottom plate 204 near the coarsely positioned guide rail is provided to the thrust of the saw blade 202,
  • the guide rail moves smoothly, and fs, H, and L need to satisfy the above relationship.
  • the bottom plate 204 When the cutting is performed, the bottom plate 204 is inclined by force, the force receiving point of the bottom plate 204 is pressed against the workpiece to be cut, the bottom plate 204 is subjected to the upward thrust F of the vertical bottom plate 204, and the two ends of the finely positioned guide rail and the through hole of the fixing member are matched. They are subject to full binding.
  • the points of the finely positioned guide rails are point A and point B, respectively, and the full binding force is FRA and FRB, respectively.
  • the full binding force is the combined force of the reaction force and the static friction force of the finely positioned guide rail by the through hole of the fixing member.
  • the guide rail can be balanced only when the thrust and the two restraining forces meet at one point. Therefore, when L ⁇ L1, that is, H>2Lfs, the thrust F and the two restraining forces are not It is possible to meet, the three forces can not reach the balance, the finely positioned guide rail can not be stuck, and the movement of the finely positioned guide rail can be realized with a small thrust F. In other words, satisfy Under the above conditions, the guide rail and the fixing member will not be stuck, and the user can operate the power tool more smoothly and comfortably.
  • the motor 400 is located at the rear end within the fuselage 100, and the rotational axis of the motor 400 is perpendicular to the rotational axis of the saw blade 202.
  • the motor 400 is coupled to the rotating shaft of the saw blade 202 via a transmission mechanism.
  • the transmission mechanism 500 includes a first bevel gear 520, a second bevel gear 540, a gear shaft 560, and a gear 580.
  • the shaft of the first bevel gear 520 and the motor 400 The rotating shaft is connected by a coupling (not shown), the teeth of the first bevel gear 520 cooperate with the teeth of the second bevel gear 540 to transmit power to a vertical direction, and the gear shaft 560 is fixedly coupled to the second cone
  • the output shaft of the gear 540 meshes with the gear 580 to transmit power to the rotational axis of the saw blade 202.
  • the power of the motor 400 is transmitted from the rear end of the body 100 to the front end, and the rotational axis of the motor 400 is perpendicular to the rotational axis of the saw blade 202.
  • the saw blade 202 is located on a first side of the fuselage 100 and the connection assembly 300 is located on a second side of the fuselage 100 opposite the first side.
  • the power tool 10 has a center plane.
  • the body 100 has an elongated axis 106 that passes through the body axis 106 and the plane of the vertical floor 204 is the center plane.
  • the connection assembly 300 and the saw blade 202 are respectively located on both sides of the center plane.
  • connection assembly 300 does not affect the operator's observation of the cutting of the object by the cutting assembly 200 during cutting by the cutting assembly 200, ie, The operator's line of sight is not obscured, and the cutting visibility is better.
  • the saw blade and the connecting assembly are arranged on both sides of the center plane so that the center of gravity of the tool is located at the center plane or closer to the center plane, thereby making the user more comfortable to hold during operation. .
  • the body 100 includes a front end that mounts the cutting assembly 200 and a rear end that is remote from the front end.
  • the body 100 includes a left side and a right side, preferably cut from the rear end of the body 100.
  • the assembly 200 is on the left side and the connection assembly 300 is on the right side. Since most of the operators are right handed, the cutting assembly 200 is on the left side, and the saw blade 210 contained within the cutting assembly 200 during operation is located just in the operator's line of sight to further enhance the visibility of the power tool 1000.
  • the planes formed by the longitudinally extending axes 328a, 328b of the two rails 330a, 330b are parallel to the plane in which the saw blade 202 is located. This arrangement makes the structure more compact, reducing the size of the power tool and making it more accessible.
  • the dimension of the connecting component 300 in the direction X is smaller than the dimension of the saw blade 202 in the direction. Further, the front end of the connecting component 300 does not exceed the front end of the saw blade 202, and the connecting component The rear end of the 300 does not exceed the rear end of the saw blade 202. In this way, the connecting component does not obstruct the saw blade, and the user can observe the cutting position of the saw blade before and after the cutting process, thereby improving the visibility.
  • the power tool 10 further includes a dust outlet 108, and the dust outlet 108 is preferably disposed at the front end of the shield portion 104. At least one of the rails is located between the dust outlet 108 and the axis of the saw blade 202. In the present embodiment, the second rail 330b is located between the dust outlet 108 and the center of the saw blade.
  • the power tool 10 further includes a spindle (not shown) for mounting the saw blade 202 and driving the saw blade 202 to rotate, and a spindle lock 110 for locking the spindle from rotating.
  • the spindle lock 110 can be locked to prevent the spindle from rotating, thereby avoiding a safety hazard caused by the user accidentally starting the tool.
  • the spindle lock 110 is located between the two rail mechanisms 326a, 326b. With further reference to Figure 14, the distance of the spindle lock 110 from the center plane is less than the distance of the second straight guides 408a, 408b from the center plane.
  • the outermost end of the spindle lock 110 does not exceed the outermost end of the connecting component.
  • the spindle lock is not easily mishandled by the user due to the blocking of the guiding mechanism.
  • the embodiment is substantially the same as the foregoing embodiment, except that the body 100 is linearly slantably connected to the bottom plate 204 via the connecting assembly 300 relative to the bottom plate 204.
  • the direction of relative movement between the rail and the fixing member is inclined to the bottom plate 204.
  • the longitudinally extending axes 328a, 328b of the guide rails are each inclined with respect to the bottom plate 204 and are parallel to each other.
  • the longitudinally extending axes 328a, 328b of the guide rail are inclined rearwardly with respect to the direction X, that is, the axis of the longitudinal extension of the guide rail is lower in the aforementioned direction X as it is lower in the aforementioned direction Y; That is, one end of the guide rail 312 fixedly connected to the bottom plate 204 is a first end, and the other end opposite to the first end is a second end, and the first end is located at a front side of the second end; that is, when the body 100 As the base plate 204 moves, the center of the saw blade 202 moves forward relative to the bottom plate 204.
  • the angle ⁇ between the longitudinally extending axes 328a, 328b of the guide rail and the bottom plate 204 is 80° to 87°. More preferably, the angle ⁇ between the longitudinally extending axes 328a, 328b of the guide rail and the bottom plate 204 is 82°. This setting can effectively prevent the rebound in the work process and improve the comfort and safety of the user operation.
  • Figure 16 is a schematic illustration of the movement of the saw blade in the embodiment of Figure 1, in which the longitudinally extending axis of the guide rail is perpendicular to the plane of the floor.
  • Figure 17 is a schematic illustration of the movement of the saw blade in the embodiment of Figure 15 in which the longitudinally extending axis of the guide rail is inclined relative to the plane of the base plate. Referring to Figures 16 and 17, the rotational direction R of the saw blade 202 causes the saw blade 202 to move upward in the forward portion of the cutting advancement direction X, and the rearward portion in the cutting advance direction X to move downward.
  • the saw blade when the user presses the tool saw blade into the workpiece and the saw blade sinks by the same distance h, in the embodiment in which the longitudinally extending axis of the guide rail is perpendicular to the bottom plate, the saw blade has no advancement amount, and Implementation of the inclination of the longitudinally extending axis of the guide rail relative to the bottom plate In the example, the saw blade has an advancement amount w. Moreover, since the former has no advancement amount, the sawing amount s1 and the front cutting amount s2 are equal, and the latter sawing amount s2 is significantly reduced, and the front cutting amount s1 is significantly increased.
  • the longitudinally extending axis of the guide rail is inclined relative to the bottom plate to reduce the amount of cutting after the saw blade and reduce the sinking speed of the saw blade, thereby effectively Improve the rebound phenomenon.

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  • Mechanical Engineering (AREA)
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Abstract

一种动力工具，包括机身（100）、切割组件（200）和连接组件（300）；所述切割组件（200）包括用于切割工件的锯片（202）及切割工件时用于抵靠工件表面的底板（204），所述机身（100）内设有电机（400），所述电机（400）用于驱动所述锯片（202）旋转，所述机身（100）通过所述连接组件（300）相对所述底板（204）可直线移动地连接至所述底板（204），需要使用该动力工具进行切割时，底板（204）相对机身（100）直线移动，由于底板（204）的移动方向为垂直于底板（204）的直线运动，因此操作者手持动力工具只需对动力工具进行下压，即可实现锯片对被切割件往下切割，操作舒适。

Description

动力工具 技术领域
本发明涉及动力工具领域。
背景技术
现有的动力工具一般为电圆锯，利用电锯片进行切割。现有电锯片的滑轨部分是通过轴承在圆弧槽中运动实现锯片往下切割的动作。由于锯片切割过程中的运动轨迹是圆弧的，不能实现直线运动，往下切割的时候，需要操作者转换电圆锯的方向，因此该电圆锯操作起来舒适性较差。
动力工具通常包括用于加工工件的锯片，收容锯片的机身，用来抵靠工件的底板和底板上供锯片穿过以切割工件的通孔，而机身和底板之间通常转动连接，这种动力工具的锯片和机身在切割过程中的运动轨迹是圆弧的，因此用户在握持机身进行切割时，用户握持的角度是不停变化的，导致操作舒适性较差。另外，当用户需要使用工具在工件中间进行开槽的作业时，锯片圆弧形的轨迹会使得用户难以预判锯片最终的切割位置，需要在进行开槽切割时前后调整工具的位置，增加了操作的难度和对操作者经验技巧的要求。
因此，有必要提出一种新的动力工具以解决上述问题。
发明内容
基于此，有必要针对切割操作舒适性较差的问题，提供一种操作舒适的动力工具，提供一种动力工具，能够保持不变的握持角度进行切割。
一种动力工具，其特征在于，所述动力工具包括机身、切割组件和连接组件；所述切割组件包括用于切割工件的锯片及切割工件时用于抵靠工件表面的底板，所述机身内设有电机，所述电机用于驱动所述锯片旋转，所述机身通过所述连接组件相对所述底板可直线移动地连接至所述底板。
本发明的有益效果是：用户在使用本发明动力工具时，其握持工具的角度是保持不变的，无需用户改变握持方向，提高了用户操作的舒适性。另外，当用户使用本发明动力工具在工件中间进行开槽作业时，锯片的运动轨迹是直线，使得用户便于预判锯片切割位置，操作难度以及对操作者的经验技巧要求低。另外，若采用切宽指示的结构来指示锯片切割位置时，有利于简化切宽指示结构的设置。
优选的，所述连接组件包括固定连接于所述机身的固定件和至少一个固定连接于 所述底板的导轨，所述导轨和所述固定件可相对移动。
优选的，所述导轨为导柱。其导向性更佳。
优选的，所述导轨为圆柱导轨。如此设置具有便于加工和装配的优势。
优选的，所述连接组件包括两个导轨，所述两个导轨在所述底板上间隔设置。
优选的，所述两个导轨纵长延伸的轴线构成的平面和所述锯片所在的平面平行。如此设置，使得结构更加紧凑，减小了工具的尺寸，使得工具的可接近性更加好。
优选的，所述两个导轨中的至少一个和所述固定件之间设有直线轴承。在两者之间设置直线轴承使得两者之间的相对运动更加顺畅，避免了机构抱死，提高了用户操作的舒适度。
优选的，所述两个导轨中靠近前端的导轨和所述固定件之间设有直线轴承。
优选的，所述导轨和所述固定件相对移动的方向相对所述底板倾斜。
优选的，所述导轨包括固定连接于所述底板的第一端、与所述第一端相对的第二端，正常使用所述动力工具进行切割时前进的方向为前，所述第一端位于所述第二端的前侧。
优选的，所述导轨纵长延伸的轴线和所述底板之间的夹角为80°至87°。
优选的，所述导轨纵长延伸的轴线和所述底板之间的夹角为82°。如此设置，可以有效防止工作过程中产生反跳，提高用户操作的舒适度和安全性。
优选的，所述连接组件还包括回复件，所述回复件可在所述底板运动至靠近所述固定件的位置后使所述底板恢复至远离所述固定件的初始状态。
优选的，所述导轨一端固定连接于所述底板，所述导轨另一端穿过所述固定件固定连接有端盖，所述回复件一端抵持所述固定件，所述回复件另一端抵持所述端盖；所述导轨包括第一导轨和第二导轨，所述固定件开设有第一通孔和第二通孔，所述第一导轨和所述第二导轨的一端均固定连接所述底板，所述第一导轨和所述第二导轨的另一端分别穿过所述第一通孔和所述第二通孔固定连接所述端盖，所述回复件位于所述第一导轨与所述第二导轨之间。
优选的，所述端盖包括位于所述固定件远离所述底板一侧的端板和朝所述底板一侧延伸的容纳部，所述固定件包括靠近所述端板的顶板，所述回复件一端抵持所述顶板，另一端抵持所述容纳部的底部。
优选的，所述导轨和所述固定件可相对移动的方向相对所述底板垂直，所述第一导轨与所述第一通孔为粗定位，所述第二导轨与所述第二通孔为精定位，所述固定件与 所述导轨之间的静摩擦系数为fs，所述固定件与所述第二导轨配合的长度为H，所述底板在所述第一导轨和所述第二导轨的连线方向上远离所述第二导轨的端部与所述第二导轨之间的距离为L，其中，H>2Lfs。如此设置，使得导轨机构可以顺畅运动，避免了机构的抱死，提高了用户操作的舒适度。
优选的，所述导轨与所述通孔配合的两端分别设有第一密封件和第二密封件，以隔离所述通孔与外界。
优选的，所述锯片位于所述机身的第一侧，所述连接组件位于所述机身的与所述第一侧相对的第二侧。如此设置避免了导向机构对锯片的遮挡，便于用户在操作时观察锯片确切的切割位置，提高可视性，并且将锯片和连接组件设置在机身两侧使得工具重心位于机身的中心平面或者更加靠近中心平面，从而使得用户在操作时握持更加舒适。
优选的，所述切割组件还包括下护罩和上护罩，所述下护罩连接于所述底板，并可随所述底板一起相对所述机身可移动，所述下护罩设于所述锯片靠近所述底板的一侧，从而可将所述锯片罩住；所述连接组件可与所述底板一起推动所述下护罩相对所述机身朝远离所述底板的方向直线移动从而露出所述锯片的一部分；所述上护罩相对所述机身固定，且罩设于所述锯片远离所述底板的一侧，从而与所述下护罩一起将整个所述锯片罩住；所述连接组件相对所述机身移动时可带动所述下护罩相对所述机身伸入或伸出所述上护罩。
优选的，所述机身包括安装所述切割组件的前端和远离所述前端的后端，所述电机位于所述机身的后端，所述电机的转动轴的轴线垂直于所述锯片的转动轴的轴线。
优选的，正常使用所述动力工具进行切割时前进的方向为前，当所述机身朝向所述底板移动时，所述锯片的中心相对所述底板向前运动。
为解决上述问题，本发明的另一个技术方案是：一种动力工具，其特征在于，所述动力工具包括机身、切割组件和连接组件；所述切割组件包括用于切割工件的锯片及切割工件时用于抵靠工件表面的底板，所述机身内设有电机，所述电机用于驱动所述锯片旋转，所述机身通过所述连接组件相对所述底板可垂直移动地连接至所述底板。
为解决上述问题，本发明的另一个技术方案是：一种动力工具，其特征在于，所述动力工具包括机身、切割组件和连接组件；所述切割组件包括用于切割工件的锯片及切割工件时用于抵靠工件表面的底板，所述机身内设有电机，所述电机用于驱动所述锯片旋转，所述机身通过所述连接组件相对所述底板可直线倾斜移动地连接至所述底板。
附图说明
图1为本发明动力工具的一个实施例结构示意图；
图2是图1动力工具在初始状态的立体示意图；
图3是图1所示动力工具切割状态的立体示意图；
图4为图1所示动力工具的连接组件对应图2、图3两种不同状态下剖视示意图；
图5为图2中所示动力工具沿A-A的剖视示意图；
图6是图1所示动力工具连接组件的剖视示意图；
图7为本发明动力工具的一个实施例的受力分析图；
图8为本发明动力工具的另一个实施例的受力分析图；
图9为图1所示动力工具的剖视图；
图10为图1所示动力工具的另一角度的剖视图；
图11为图1所示动力工具的俯视图；
图12为图1所示动力工具的侧视图；
图13是图1所示动力工具的主视图；
图14是图1所示动力工具隐藏端盖后的俯视图；
图15是本发明另一个实施例的动力工具的主视图；
图16是图1所示动力工具的锯片运动示意图；
图17是图15所示动力工具的锯片运动示意图；
其中：
10动力工具            100机身               200切割组件
300连接组件           400电机               202锯片
204底板               206上护罩             208下护罩
310连接件             332固定件             330导轨
314端盖               316端板               318容纳部
362顶板               320螺钉               322第一密封件
324第二密封件         500传动机构           520第一锥齿轮
540第二锥齿轮         560齿轮轴             580齿轮
380回复件             210孔                 212抵靠面
328a第一导轨纵长延伸  328b第二导轨纵长延伸  330a第一导轨
轴线                  轴线
330b第二导轨          332a第一固定件         332b第二固定件
106机身轴线            108出尘口              110主轴锁
334a、b直线轴承        336a、b轴套            600工件
h锯片下沉量            w锯片前进量            l锯片移动距离
s1后切入量             s2前切入量
具体实施方式
为了使本发明的目的、技术方案和优点更加清楚明了，以下根据附图及实施例，对本发明进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不限定本发明。
参考图1和图2所示，本发明一实施例中，动力工具10包括机身100、切割组件200和连接组件300，切割组件包括用于切割工件的锯片202、切割工件时用于抵靠工件表面的底板204。机身100内设有用于驱动动力工具10工作电机400，具体的，电机300用于驱动锯片202旋转以切割工件。锯片202优选为圆锯片，锯片202可以是带磨粒的磨削片，也可以是焊接有硬质合金刀头的锯片，也可以是无硬质合金刀头的锯片。电机400收容于机身100中。底板204具有抵靠工件的抵靠面212，底板204上设置有供锯片202在切割时穿过的孔210。定义用户正常使用该动力工具进行切割时前进的方向X为前方，与之相反的方向为后方X’。定义用户正常使用该动力工具进行切割时下压的方向Y为下方，与之相反的方向为上方Y’。
参考图2、图3和图4所示，其中图4实线位置表示动力工具10在初始状态时，即不工作时连接组件剖视图；虚线位置表示动力工具10在切割状态时，即工作时连接组件剖视图。结合图2-4所示，当用户需要使用动力工具10时，通常将底板204抵压住被切割工件，并沿Y方向下压机身，使得底板204相对机身移动后锯片210从孔210中穿过，在电机400的驱动下，锯片210转动，实现对被切割工件的切割，并且用户可以沿X方向推动动力工具10，使动力工具向前切割。当不需要使用动力工具10时，底板204和机身100相对反向运动，恢复至初始状态。
参考图1、图2和图3所示，机身100通过连接组件300相对底板204可直线移动地连接至底板204。具体的，在本实施例中，机身100通过连接组件300相对底板204可垂直移动地连接至底板204，即机身100通过连接组件300在垂直于底板204的方向上可直线移动地连接至底板204。亦可以是底板204通过连接组件300可相对锯片202在基本垂直于底板204的方向上直线移动地连接于机身100。使用该动力工具10时，通常将底板204抵压住被切割工件，在抵压过程中，机身100相对底板204移动。连接组 件300包括固定件332和连接件310。固定件和连接件之间可以相对移动。连接件310包括至少一个固定连接于底板204的导轨330和端盖314，导轨330和固定件332可相对移动。在本实施例中，导轨330包括两个导轨，分别是第一导轨330a和第二导轨330b。优选的，导轨为柱状件。第一、第二导轨330a、330b一端固定连接于底板204上，第一、第二导轨330a、330b在底板204上间隔设置。固定件332a、332b固定连接于机身100，固定件可以是多个零件的组合也可以是一体成型的一个零件，在本实施例中，和第一导轨330a配合的孔状结构的部分为第一固定件332a，和第二导轨330b的孔状结构配合的部分为第二固定件332b。当然，固定件包括孔状结构且设置在底板上，而导轨为设置在机身上的柱状件也是可以的。第一导轨330a和第一固定件332a沿着第一导轨的纵长延伸轴线328a彼此同轴配合进行导向，彼此之间可以沿该轴线328a相对移动。第二导轨330b和第二固定件332b沿着第二导轨的纵长延伸轴线328b彼此同轴配合进行导向，彼此之间可以沿该轴线328b相对移动。而第一导轨纵长延伸轴线328a和第二导轨纵长延伸轴线328b互相平行。另外，机身100和底板204两者相对移动的方向也和这两个导轨的纵长延伸轴线平行。具体的，在本实施例中，第一导轨330a穿过第一固定件332a，而第二导轨330b穿过第二固定件332b。另外，在本实施例中，连接组件300还包括和第一、第二导轨330a、330b固定连接的端盖314。第一导轨330a穿过第一固定件332a后，固定连接至端盖314，第二导轨330b穿过第二固定件332b后，固定连接至端盖314。端盖314包括位于固定件332远离底板204一侧的端板316。具体地，第一、第二导轨330a、330b与端盖的端板316固定连接，优选的，导轨与端板316通过螺钉320固定连接。虽然本实施例采用了第一第二导轨和第一第二固定件互相配合进行导向，但是只采用一个导轨和一个固定件互相配合进行导向也是可以的。当然采用两个导轨能够大大增加其移动的稳定性。而端盖314可以防止固定件和导轨互相脱离。在本实施例中，导轨330a、330b优选为导柱，更优选为圆柱导轨。如此设置，其导向性更加，且便于加工和装配。
参考图1所示，在其中一个实施例中，切割组件200还包括下护罩208和上护罩206，下护罩208连接于底板204，下护罩208并可随底板204一起相对机身100可移动。下护罩208罩设于锯片202靠近底板204的一侧，从而可将锯片202罩住。下护罩208和锯片202一起位于机身100的第一侧。连接组件300可与底板204一起推动下护罩208相对机身100朝远离底板204的方向直线移动从而露出锯片202的一部分。下护罩208的设置既可更好地保护锯片202又防止锯片202露出底板204对人体造成伤害。
上护罩206相对机身100固定，上护罩206罩设于锯片202远离底板204的一侧，从而与下护罩208一起将整个锯片202罩住。请参阅图5，切割组件200的锯片202、下护罩208以及上护罩206均位于机身100的第一侧。连接组件300相对于机身100移动时可带动下护罩208相对机身100伸入或伸出上护罩206。上护罩206进一步对锯片202起到保护作用，即防止被上护罩206罩住的锯片202受到其他物体的损害，同样也可防止锯片202对人体的伤害。
参考图5、6所示，连接组件300还包括回复件380。回复件350可在动力工具10从切割状态恢复到初始状态时，提供回弹力使得底板204和机身100互相远离，即底板204运动至靠近固定件332的位置后可使底板204恢复至远离固定件332的初始状态。在本实施例中，回复件380设置在固定件332和连接件310之间，其一端抵持固定件332，另一端抵持连接件310。具体的，位于端盖314和固定件332之间。优选的，回复件380为压缩弹簧。在本实施例中，固定件具有靠近端板316的顶板362。端盖314该包括朝底板204一侧延伸的容纳部318。回复件380一端抵持顶板362，另一端抵持容纳部318的底部。而固定件的顶板362可在容纳部318和端板316构成的空间内上下移动。在回复件380的作用下，顶板362与端板316互相抵靠，即当动力工具10处于图2所示的初始状态时，端盖314和固定件332a、332b互相抵靠。当用户切割工件时，动力工具10处于图3所示的切割状态，用户向下按压机身，底板204和机身100相对运动的过程中，与机身固定连接的固定件332相对底板204向下运动，而固定件的顶板362向下按压回复件380，使得回复件380被压缩，导轨和固定件沿导轨的纵长延伸轴线相对移动进行导向。而当用户停止切割工件并开始收回动力工具10时，回复件380的回复力推动底板204和机身100相对反向运动恢复到初始位置，实现自动复位。
参考图12所示，在本实施例中，连接组件300还包括至少一个直线轴承418，直线轴承设置在导轨和固定件之间，也就是说，两个导轨中的至少一个个固定件之间设有直线轴承，即第一导轨330a、第一固定件332a之间和/或第二导轨330b、第二固定件332b之间具有直线轴承。在本实施例中，直线轴承418设置在第一导轨330a和第一固定件332a之间。当然，将直线轴承418设置在第二导轨330b和第二固定件332b之间也是可以的。优选的，直线轴承418设置在靠近前端的导轨和固定件之间。导轨和固定件之间增加直线轴承可以使得两者之间的相对运动更加顺畅，避免了机构抱死，提高了用户操作的舒适度。在本实施例中，固定件332开设有第一通孔和第二通孔，而固定件包括第 一通孔的部分即为第一固定件332a，而包括第二通孔的部分即为第二固定件。第一导轨330a和第二导轨330b的一端均固定连接底板204上，第一导轨330a和第二导轨330b的另一端分别穿过第一通孔和第二通孔固定连接端盖314，回复件380位于第一导轨与第二导轨之间。第一导轨330a与锯片202转动轴之间的距离基本等于第二导轨330b与锯片202转动轴之间的距离。参考图4所示，在本实施例中，导轨与通孔配合的两端分别设有第一密封件322和第二密封件324，以隔离通孔与外界。通过在通孔的两个端口设置密封圈，对导轨与通孔配合区域封闭，使通孔与外界隔离，防止在切割过程中碎屑进入通孔内对导轨和固定件之间的配合造成影响。
参考图7和图8所示，第一导轨与第一通孔的配合以及第二导轨与第二通孔的配合，其中一个为粗定位，另一个为精定位。在本实施例中，粗定位情况下，互相配合的导轨和通孔为滑动摩擦，精定位情况下，互相配合的导轨和通孔为滚动摩擦，且粗定位比精定位的间隙大。在图7所示的实施例中，第二导轨330a和第二固定件332a之间设置轴套336a粗定位，第一导轨330a和第一固定件332a通过直线轴承334b精定位，通过直线轴承精定位的第二固定件332b与第二导轨330b之间的静摩擦系数为fs，第二固定件332b与第二导轨330b配合的长度为H，底板204在第一导轨和第二导轨的连线方向上远离第二导轨330b的端部与第二导轨330b之间的距离为L，fs、H以及L之间满足如下关系：H>2Lfs。而在图8所示的实施例中，第一导轨330a和第一固定件332a通过直线轴承334a精定位，而第二导轨330b和第二固定件332b通过轴套336b粗定位。通过直线轴承418精定位的第一固定件332a和第一导轨330a之间的静摩擦系数为fs，第一固定件332a和第一导轨330a配合的长度为H，底板204在第一导轨和第二导轨的连线方向上远离第一导轨330a的端部与第二导轨330a之间的距离为L，上述参数fs，H，L之间满足如下关系H>2Lfs。
在图7所示的实施例中，沿前述定义的方向X，位于左侧的第一导轨330a和第一固定件332a之间通过轴套336a粗定位。粗定位的第一导轨330a和第一固定件332a之间的配合间隙较大，即第一导轨和第一通孔之间的配合间隙较大。当底板204受力时，粗定位的第一导轨330a偏转时不受力。位于右侧的第二导轨330b和第二固定件332b之间通过直线轴承精418b定位，精定位的第二导轨330b和第二固定件332b之间的配合间隙较小，即第二导轨和第二通孔之间的配合间隙较小，当底板204受力时，精定位的第二导轨330b偏转时受力。在对工件进行切割时，工件对底板204的作用力F的受 力点在底板204靠近粗定位的第一导轨330a的一端，L为底板204受力点与精定位的第二导轨330b之间的距离，即底板204上沿锯片方向X远离精定位的第二导轨330b的一端到精定位的第二导轨330b之间的距离。
在图8所示的实施例中，沿前述定义的方向X，位于右侧的第二导轨330b和第二固定件332b之间通过轴套336b粗定位。粗定位的第二导轨330b和第二固定件332b之间的配合间隙较大，即第二导轨和第二通孔之间的配合间隙较大。当底板204受力时，粗定位第二导轨330b偏转时不受力。位于左侧的第一导轨330a和第一固定件332a之间通过直线轴承334a精定位，精定位的第一导轨330a和第一固定件332a之间的配合间隙较小，即第一导轨和第一通孔之间的配合间隙较小。当底板204受力时，精定位的第一导轨330a偏转时受力。在对工件进行切割时，工件对底板204的作用力F的受力点在底板204靠近粗定位的第二导轨330b的一端，L为底板204受力点与精定位的第一导轨330a之间的距离，即底板204上方向X远离精定位的第一导轨330a的一端到精定位的第一导轨330a之间的距离。
具体地，第一导轨和第二导轨分别通过第一通孔和第二通孔与固定件配合，对底板204靠近粗定位的导轨的受力点提供面向锯片202的推力时，为了能使导轨顺利移动，fs、H以及L需满足上述关系。
在进行切割时，将底板204受力倾斜，底板204的受力点抵压住被切割工件，底板204受到垂直底板204向上的推力F，精定位的导轨与固定件的通孔配合的两端分别会受到全约束力，精定位的导轨的受力点分别为A点和B点，全约束力分别为FRA和FRB。全约束力为精定位的导轨受到与之配合的固定件的通孔对其的反作用力与静摩擦力的合力。在精定位的导轨处于临界平衡点时，精定位的导轨受到的静摩擦力达到最大值，此时全约束力与反作用力之间的夹角也是最大的，该夹角为摩擦角Ф。全约束力作用线与反作用力之间的夹角达到摩擦角Ф时，两个全约束力的作用线相交于C点，此时C点和与精定位的导轨之间的长度为临界长度L1，此时，L1＝H*cotФ/2，cotФ表示摩擦角Ф的余切值，静摩擦系数fs为摩擦角Ф的正切值，从而L1＝H/2fs。由于全约束力作用线与反作用力之间的夹角只能在摩擦角Ф以内，从而两个全约束力的作用线只能相交于C点或作用线相交后形成的远离精定位的导轨阴影区域内。根据三力平衡汇交条件可知，只有当推力以及两个约束力交汇于一点时精定位的导轨才能平衡，因此，当L<L1时，即H>2Lfs时，推力F以及两个约束力不可能汇交，三力不可能达到平衡，精定位的导轨不能被卡住，只需较小的推力F即可实现精定位的导轨的移动。也就是说，满足 上述条件时，导轨和固定件不会卡死，用户可以操作该动力工具时会更加顺畅舒适。
请参阅图9，在其中一个实施例中，电机400位于机身100内的后端，电机400的转动轴垂直于锯片202的转动轴。
具体地，电机400通过传动机构与锯片202的转动轴连接，传动机构500包括第一锥齿轮520、第二锥齿轮540、齿轮轴560和齿轮580，第一锥齿轮520的轴与电机400的转动轴通过联轴器(图未标)连接，第一锥齿轮520的轮齿与第二锥齿轮540的轮齿配合从而将动力传递到垂直的方向，齿轮轴560固定连接于第二锥齿轮540的输出轴，并与齿轮580啮合，将动力传递到锯片202的转动轴。这样，使电机400的动力从机身100的后端传递到前端，并使电机400的转动轴垂直于锯片202的转动轴。
参考图10-12所示，在其中一个实施例中，锯片202位于机身100的第一侧，连接组件300位于机身100的与第一侧相对的第二侧。参考图11所示，动力工具10具有一个中心平面，在本实施例中，机身100具有一个纵长的轴线106，过机身轴线106且垂直底板204的平面为中心平面。连接组件300和锯片202分别位于中心平面的两侧。由于切割组件200的锯片210和连接组件300分别位于机身100相对的两侧，因此在利用切割组件200切割的过程中，连接组件300不影响操作者观察切割组件200对物体的切割，即不会遮挡操作者的视线，切割可视性较好,将锯片和连接组件设置在中心平面的两侧使得工具重心位于中心平面或者更加靠近中心平面，从而使得用户在操作时握持更加舒适。
在其中一个实施例中，机身100包括安装切割组件200的前端和远离前端的后端，从机身100的后端往前端看，机身100包括左侧和右侧，优选地，切割组件200位于左侧，连接组件300位于右侧。由于大部分操作者为右手操作，切割组件200在左侧，在操作时包含在切割组件200内的锯片210正好位于操作者的视线区域，进一步提高该动力工具1000的可视性。
参考图13所示，在本实施例中，两个导轨330a、330b的纵长延伸的轴线328a、328b构成的平面和锯片202所在的平面平行。如此设置，使得结构更加紧凑，减小了该动力工具的尺寸，使其可接近性更加好。
参考图13所示，在本实施例中，连接组件300沿方向X的尺寸小于锯片202沿该方向的尺寸，进一步的，连接组件300的前端不超过锯片202的前端，并且，连接组件300的后端不超过锯片202的后端。如此设置，连接组件不会对锯片造成遮挡，用户在切割过程中可以观察到锯片前后切割位置，提高了可视性。
参考图13所示，在本实施例中，动力工具10还包括出尘口108，出尘口108优选设置在护罩部104的前端。导轨中的至少一个位于出尘口108和锯片202的轴线之间，在本实施例中，第二导轨330b位于位于出尘口108和锯片中心之间。
参考图13所示，在本实施例中，动力工具10还包括用于安装锯片202并带动锯片202旋转的主轴(未示出)和用于锁定主轴不让其旋转的主轴锁110，当用户需要更换锯片时，可以通过锁定主轴锁110来防止主轴旋转，避免用户误启动工具造成安全隐患。在本实施例中，主轴锁110位于两个导轨机构326a、326b之间。进一步参考图14所示，主轴锁110到中心平面的距离小于第二直导件408a、408b到中心平面的距离。也就是说，主轴锁110的最外端未超出连接组件的最外端，当用户不需要锁定主轴锁的时候，由于有导向机构的阻挡，主轴锁不易被用户误操作。
参考图15所示，此为本发明另一实施例。本实施例与前述实施例大致相同，其区别在于机身100通过连接组件300相对底板204可直线倾斜移动地连接至底板204，具体的，导轨和固定件之间相对移动的方向与底板204倾斜。也就是说，导轨纵长延伸的轴线328a、328b均相对底板204倾斜设置，且互相平行。参考图16所示，导轨纵长延伸的轴线328a、328b均相对前述的方向X向后倾斜，即导轨纵长延伸的轴线沿前述的方向Y越靠下则沿前述的方向X越靠前；也就是说，导轨312固定连接于底板204的一端为第一端，与第一端相对的另一端为第二端，而第一端位于第二端的前侧；也就是说，当机身100朝向所述底板204移动时，锯片202的中心相对底板204向前运动。优选的，导轨纵长延伸的轴线328a、328b和底板204之间的夹角α为80°至87°。更优选的，导轨纵长延伸的轴线328a、328b和底板204之间的夹角α为82°。如此设置，可以有效防止工作过程中产生反跳，提高用户操作的舒适度和安全性。
图16是图1所示实施例中锯片运动的示意图，该实施例中的导轨纵长延伸的轴线与底板所在平面垂直。图17是图15所示实施例中锯片运动的示意图，该实施例中的导轨纵长延伸的轴线相对底板所在平面倾斜设置。参考图16、17所示，锯片202的旋转方向R使得锯片202沿切割前进方向X靠前的部分向上运动，沿切割前进方向X靠后的部分向下运动。因此当锯片202靠后的部分突然高速旋转并向下切割入工件600时，工件600对锯片202的阻力瞬间增加容易使得工具产生反弹，工具反弹会使操作者操作不适，并降低安全性，还容易损伤工件或导致切割不准。对比图16、17可知，当用户下压工具锯片切入工件时，锯片下沉相同距离h的情况下，导轨纵长延伸的轴线垂直底板设置的实施例中，锯片没有前进量，而导轨纵长延伸的轴线相对底板倾斜设置的实施 例中，锯片具有前进量w。并且，前者由于没有前进量，故锯片后切入量s1和前切入量s2相等，而后者的锯片后切入量s2明显减少，前切入量s1明显增加。另外，当锯片移动距离l相同的情况下，后者锯片下沉量h会小于前者锯片下沉量h，因此当用户使用相同的速度向下推锯片时，后者的锯片下沉速度也会小于前者的锯片下沉速度。由于反弹现象主要是因为锯片后部切入工件受阻而产生的，故导轨纵长延伸的轴线相对底板倾斜设置既减小了锯片后切入量，又降低了锯片下沉速度，从而可以有效改善反弹现象。
以上实施例仅表达了本发明的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变形和改进，这些都属于本发明的保护范围。因此，本发明专利的保护范围应以所附权利要求为准。

Claims (18)

  1. 一种动力工具，其特征在于，所述动力工具包括机身、切割组件和连接组件；所述切割组件包括用于切割工件的锯片及切割工件时用于抵靠工件表面的底板，所述机身内设有电机，所述电机用于驱动所述锯片旋转，所述机身通过所述连接组件相对所述底板可直线移动地连接至所述底板。
  2. 根据权利要求1所述的动力工具，其特征在于：所述连接组件包括固定连接于所述机身的固定件和至少一个固定连接于所述底板的导轨，所述导轨和所述固定件可相对移动。
  3. 根据权利要求2所述的动力工具，其特征在于：所述导轨为导柱。
  4. 根据权利要求2所述的动力工具，其特征在于：所述连接组件包括两个导轨，所述两个导轨在所述底板上间隔设置。
  5. 根据权利要求4所述的动力工具，其特征在于：所述两个导轨中的至少一个和所述固定件之间设有直线轴承。
  6. 根据权利要求2所述的动力工具，其特征在于：所述导轨和所述固定件相对移动的方向相对所述底板倾斜。
  7. 根据权利要求6所述的动力工具，其特征在于：所述导轨包括固定连接于所述底板的第一端、与所述第一端相对的第二端，正常使用所述动力工具进行切割时前进的方向为前，所述第一端位于所述第二端的前侧。
  8. 根据权利要求2所述的动力工具，其特征在于：所述连接组件还包括回复件，所述回复件可在所述底板运动至靠近所述固定件的位置后使所述底板恢复至远离所述固定件的初始状态。
  9. 根据权利要求8所述的动力工具，其特征在于：所述导轨一端固定连接于所述底板，所述导轨另一端穿过所述固定件固定连接有端盖，所述回复件一端抵持所述固定件，所述回复件另一端抵持所述端盖；所述导轨包括第一导轨和第二导轨，所述固定件开设有第一通孔和第二通孔，所述第一导轨和所述第二导轨的一端均固定连接所述底板，所述第一导轨和所述第二导轨的另一端分别穿过所述第一通孔和所述第二通孔固定连接所述端盖，所述回复件位于所述第一导轨与所述第二导轨之间。
  10. 根据权利要求9所述的动力工具，其特征在于：所述端盖包括位于所述固定件远离所述底板一侧的端板和朝所述底板一侧延伸的容纳部，所述固定件包括靠近所述端板的顶板，所述回复件一端抵持所述顶板，另一端抵持所述容纳 部的底部。
  11. 根据权利要求9所述的动力工具，其特征在于：所述导轨和所述固定件可相对移动的方向相对所述底板垂直，所述第一导轨与所述第一通孔为粗定位，所述第二导轨与所述第二通孔为精定位，所述固定件与所述导轨之间的静摩擦系数为fs，所述固定件与所述第二导轨配合的长度为H，所述底板在所述第一导轨和所述第二导轨的连线方向上远离所述第二导轨的端部与所述第二导轨之间的距离为L，其中，H>2Lfs。
  12. 根据权利要求9所述的动力工具，其特征在于：所述导轨与所述通孔配合的两端分别设有第一密封件和第二密封件，以隔离所述通孔与外界。
  13. 根据权利要求1所述的动力工具，其特征在于：所述锯片位于所述机身的第一侧，所述连接组件位于所述机身的与所述第一侧相对的第二侧。
  14. 根据权利要求1所述的动力工具，其特征在于：所述切割组件还包括下护罩和上护罩，所述下护罩连接于所述底板，并可随所述底板一起相对所述机身可移动，所述下护罩设于所述锯片靠近所述底板的一侧，从而可将所述锯片罩住；所述连接组件可与所述底板一起推动所述下护罩相对所述机身朝远离所述底板的方向直线移动从而露出所述锯片的一部分；所述上护罩相对所述机身固定，且罩设于所述锯片远离所述底板的一侧，从而与所述下护罩一起将整个所述锯片罩住；所述连接组件相对所述机身移动时可带动所述下护罩相对所述机身伸入或伸出所述上护罩。
  15. 根据权利要求1所述的动力工具，其特征在于：所述机身包括安装所述切割组件的前端和远离所述前端的后端，所述电机位于所述机身的后端，所述电机的转动轴的轴线垂直于所述锯片的转动轴的轴线。
  16. 如权利要求1所述的动力工具，其特征在于：正常使用所述动力工具进行切割时前进的方向为前，当所述机身朝向所述底板移动时，所述锯片的中心相对所述底板向前运动。
  17. 一种动力工具，其特征在于，所述动力工具包括机身、切割组件和连接组件；所述切割组件包括用于切割工件的锯片及切割工件时用于抵靠工件表面的底板，所述机身内设有电机，所述电机用于驱动所述锯片旋转，所述机身通过所述连接组件相对所述底板可垂直移动地连接至所述底板。
  18. 一种动力工具，其特征在于，所述动力工具包括机身、切割组件和连接组件；所述切割组件包括用于切割工件的锯片及切割工件时用于抵靠工件表面的 底板，所述机身内设有电机，所述电机用于驱动所述锯片旋转，所述机身通过所述连接组件相对所述底板可直线倾斜移动地连接至所述底板。
PCT/CN2016/073879 2015-02-16 2016-02-16 动力工具 Ceased WO2016131412A1 (zh)

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CN107081473A (zh) * 2016-02-16 2017-08-22 苏州宝时得电动工具有限公司 动力工具
CN109202172A (zh) * 2017-06-30 2019-01-15 苏州宝时得电动工具有限公司 便携式电圆锯

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CN107081473A (zh) * 2016-02-16 2017-08-22 苏州宝时得电动工具有限公司 动力工具
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