WO2012022269A1

WO2012022269A1 - Portable cutting machine

Info

Publication number: WO2012022269A1
Application number: PCT/CN2011/078611
Authority: WO
Inventors: 孙益民; 张士松; 吴宇; 鲍瑞那图·强尼; 何明明; 周达
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2010-08-18
Filing date: 2011-08-18
Publication date: 2012-02-23

Abstract

A portable cutting machine comprises a housing (12), a swinging output shaft (16) partly projecting out of the housing and having an output shaft axis；an electric motor (14) accommodated within the housing; a driving shaft (44) for rotating under the drive of the electric motor (14), with the driving shaft (44) having a driving shaft axis; and a motion converting mechanism for converting the rotational movement of the driving shaft (44) into the swinging movement of the swinging output shaft, wherein, the output shaft axis and the driving shaft axis are arranged in parallel with each other. The portable cutting machine has relatively low vibration during cutting, so that the cutting precision and the handling comfort thereof are improved.

Description

Portable cutting machine

The present invention relates to a portable cutting machine, and more particularly to a portable cutting machine for swinging and cutting a workpiece. Background technique

The utility model relates to a portable cutting machine which swings and cuts a workpiece by driving a saw blade, and is internally provided with a motor, an eccentric member driven by the motor, a shifting fork which cooperates with the eccentric member to convert the rotation into a swing, and a swing output shaft driven by the shift fork And a saw blade mounted on the oscillating output shaft.

In the prior art, the axis of the motor shaft is perpendicular to the axis of the swing output shaft, so that the friction generated during the engagement of the eccentric member and the shifting fork is parallel to the axis of the swing output shaft, and the friction is Under the action of the force, the oscillating output shaft will produce a certain displacement along its own axis, so that as the portable cutting machine cuts the workpiece, the load of the portable cutting machine becomes larger, and then the frictional force increases, and the swing output is The vibration generated by the shaft along the axis is very severe, resulting in poor cutting precision, and the entire body is too vibrating, and the user is very uncomfortable. When used for a long time, the user's health is greatly damaged.

Summary of the invention

The present invention provides a portable cutting machine, and more particularly to a portable cutting machine having a good shock absorbing effect.

To achieve the above object, the technical solution of the present invention is: a portable cutting machine comprising: a housing; a swing output shaft partially extending from the housing, having an output shaft axis; a motor housed in the housing; a drive shaft that is rotated by the motor, the drive shaft has a drive shaft axis; a motion conversion mechanism that converts the rotation of the drive shaft into a swing of the swing output shaft; the output shaft axis and the drive shaft The axes are arranged parallel to each other.

Preferably, the motion conversion mechanism includes an eccentric member mounted on the drive shaft, and a shifting fork that cooperates with the eccentric member and is fixedly mounted on the oscillating output shaft, the eccentric member having opposite to the The drive shaft axis is eccentrically disposed with a center line, and the center line is disposed in parallel with the output shaft axis.

Preferably, the swinging output shaft has a swing frequency greater than 30,000 beats/min.

Preferably, the housing includes a motor housing portion for housing the motor, and a grip portion for gripping, the grip portion being disposed apart from the housing portion.

Preferably, the entire length of the grip portion extends to form a length direction of the grip portion, and the longitudinal extension direction of the grip portion is perpendicular to the axis of the drive shaft. Preferably, the output shaft axis is perpendicular to the longitudinal extension direction of the grip portion.

Preferably, the housing is further provided with a battery pack receiving portion extending in the same direction as the grip portion.

Compared with the prior art, the portable cutting machine of the present invention realizes the vibration of the motion conversion mechanism perpendicular to the axis of the swing output shaft by arranging the axis of the drive shaft and the axis of the swing output shaft in parallel with each other. The output shaft does not shift along its axial direction. Therefore, when the portable cutting machine performs the cutting work, the swing output shaft does not vibrate in its own axis direction, so that the saw blade mounted on the swing output shaft can be more precise. The cutting is performed, and the portable cutting machine has very good operational comfort.

The present invention also provides a saw blade for cutting a curved surface.

In order to achieve the above object, the present invention provides a saw blade for a portable cutting machine, the portable cutting machine comprising: a housing; a swing output shaft partially extending out of the housing and outputting a swing; and a motor housed in the housing And outputting a rotation; converting the rotation of the motor into a transmission mechanism of the swinging output shaft; the saw blade includes: a connecting portion having a mounting hole mounted to the swing output shaft, and the connecting The first portion and the second side extending in the longitudinal direction and disposed opposite to each other; the saw blade further comprising: a base extending from the first side to the second side on the connecting portion The base has a cutting portion along a side of the connecting portion that is away from the mounting hole in the longitudinal direction.

Preferably, the base is a portion that protrudes from the second side of the connecting portion.

Preferably, the base extends only in a direction from the first side to the second side.

Preferably, the length of the base along its own extending direction ranges from 2 mm to 80 mm.

Preferably, the bases are distributed in a width along their own extending direction.

Preferably, the width ranges from 5 mm to 1 1 mm.

Preferably, the cutting portion is composed of serrations, the serrations extending obliquely with respect to the base, and extending in a direction toward the first side.

Preferably, the cutting portion is composed of serrations, and the tooth tips of the serrations form an arc-shaped cutting line. Preferably, the side wall of the base facing away from the cutting portion extends in a straight line.

The present invention also provides a portable cutting machine for processing a workpiece, comprising: a housing; a swinging output shaft partially extending from the housing and outputting a swing; a motor housed in the housing, and outputting a rotation; The rotation of the motor is converted into a transmission mechanism of the swing of the swing output shaft; the swing frequency of the swing output shaft is greater than or equal to 20,000 times/minute, and the swing output shaft is mounted with the saw blade.

Compared with the prior art, the saw blade of the present invention is improved by the structure of the conventional saw blade. The portable cutter that installs the saw blade can cut the surface on the workpiece and expand the function of the traditional swing cutter. That is, when the user cuts the workpiece using the saw blade of the present invention, the cutting can be performed only by the base portion, and since the width of the base portion is narrow and extends from the side of the connecting portion of the saw blade, it is on the swinging output shaft. Under the driving, the surface of any shape can be cut on the surface of the workpiece, which brings convenience to the user's work and life, and greatly meets the needs of the user.

The present invention provides a portable cutting machine, and more particularly to a portable cutting machine having a stable cutting process.

In order to achieve the above object, the present invention provides a portable cutting machine for cutting a workpiece, comprising: a housing; a swinging output shaft partially extending from the housing and outputting a swing; a motor housed in the housing, and outputting Rotating; a transmission mechanism for converting the rotation of the motor into the swing of the swing output shaft; a saw blade mounted on the swing output shaft for swing cutting, the saw blade forming a swing plane; the portable cutter A support assembly is coupled to the housing and for abutting the workpiece.

Preferably, the support assembly has an abutment surface against the workpiece, and an axis of the oscillating output shaft is parallel to the abutment surface.

Preferably, the support assembly has a bottom plate on which the abutment surface is disposed, and the position of the bottom plate relative to the swing output shaft is adjustable.

Preferably, the swinging plane is perpendicular to the abutting surface, so that the projection of the swinging plane on the abutting surface is a straight line, and the bottom plate can only output relative to the swinging direction along the extending direction of the straight line. The axis adjusts the position.

Preferably, the support assembly includes a bottom plate for abutting the workpiece, the bottom plate being provided with a guide roller for guiding the saw blade.

Preferably, the bottom plate has a slot for the blade to protrude, the number of the guide rollers is two, and is disposed at an end of the slot along the swinging plane away from the swing output shaft. The saw blade is located between the two guide rollers.

Preferably, the end of the saw blade away from the swing output shaft is provided with serrations, the serration includes a tooth tip and a root for cutting, and a region of the saw blade contacting the guide roller to the tooth The root distance is greater than 1 mm and less than 20 mm.

Preferably, a support base for supporting the transmission mechanism is disposed in the portable cutting machine, and the housing, the motor and the support assembly are directly fixedly connected to the support base.

Preferably, the bottom plate has a connecting member, and the housing includes a head shell on which the swing output shaft is mounted, and the connecting member is sleeved on the head shell and matched with the head shell. Preferably, the swing output shaft is mounted with a saw blade, and the connecting member is sandwiched between the saw blade and the head case.

Preferably, the connector is made of a flexible material.

Preferably, an anti-slip layer is disposed between the connecting member and the head case.

Compared with the prior art, the portable cutting machine of the present invention makes the cutting process of the portable cutting machine more stable and reliable by setting the supporting assembly against the surface of the workpiece, thereby improving the cutting precision of the user, and the user's arm does not process during the cutting process. It is in a floating state, which saves the user's physical strength and improves the operating comfort.

The present invention provides a portable cutting machine, and more particularly to a portable cutting machine in which the blade heats up faster.

In order to achieve the above object, the present invention provides a portable cutting machine, comprising: a housing; a swing output shaft partially extending from the housing and outputting a swing; a motor housed in the housing, and outputting a rotation; a drive mechanism for converting rotation of the motor into a swing of the swing output shaft; a saw blade mounted on the swing output shaft for swing cutting, and having a cutting direction; a fan disposed in the housing And providing an air inlet hole on the casing, and providing an air outlet toward the saw blade at a position close to the saw blade, and forming a gap between the fan and the air outlet The airflow of the airflow.

Preferably, the fan is mounted on a motor shaft of the motor, the air duct has a duct inlet, and the duct inlet is disposed on the casing along a circumferential direction of the motor.

Preferably, the fan is a centrifugal fan.

Preferably, the air inlet hole is disposed on the housing along an axial direction of the motor shaft.

Preferably, the portion of the housing that houses the motor includes an end wall and a side wall circumferentially surrounding the motor, the air inlet hole is disposed at the end wall, and the air duct inlet is disposed at the side wall The side wall gradually increases along the inner diameter of the air inlet hole to the air duct inlet.

Preferably, a support base for receiving the transmission mechanism is fixedly mounted in the housing, and the air passage is formed on the support base.

Preferably, the support base is provided with a receiving space for receiving the transmission mechanism, and a thickness of the side wall between the air channel and the receiving space is greater than 1 mm and less than 20 mm.

Preferably, the support base is made of an aluminum alloy material.

Preferably, the casing is provided with a baffle at a circumferential position of the swing output shaft protruding from the casing, and the air outlet is disposed on the baffle. Compared with the prior art, the portable cutting machine of the present invention can realize the flow of air flowing through the air outlet to the saw blade by setting the air outlet toward the saw blade, thereby accelerating the flow of the airflow near the saw blade, thereby being able to quickly The heat generated by the saw blade cutting process is carried away, so that the saw blade does not overheat during the cutting process, and the finger is burned when the user replaces the saw blade, and the saw blade is prevented from being easily broken due to overheating. This increases the operational safety and increases the service life of the saw blade.

In view of the deficiencies of the prior art, it is an object of the present invention to provide a portable cutter having a high swing frequency of the working head.

In order to achieve the above destination, the technical solution adopted by the present invention is: A portable cutting machine, comprising: a housing; a motor and a transmission mechanism disposed in the housing; and an oscillating motion relative to the housing under the driving of the motor and the transmission mechanism The working head; the swinging frequency of the working head is greater than or equal to 20,000 times/min.

Preferably, the operating head has a swing frequency between 20,000/min and 45,000/min.

Preferably, the operating head has a swing frequency of between 30,000 beats/min to 35,000 beats/min.

Preferably, the portable cutting machine is provided with a circulating cooling device.

Preferably, the housing is provided with fins for increasing the heat dissipation area.

Preferably, the portable cutting machine further includes a controller, the controller monitors an operating voltage and a load current of the motor, and calculates a target voltage required to reach a preset speed according to a load current of the motor, and adjusts the The operating voltage of the motor to the target voltage causes the motor to rotate constantly at a preset speed.

Preferably, the portable cutting machine is provided with a pipe, and the pipe sprays the cooling medium to the working head.

Preferably, the portable cutting machine further includes an output shaft extending from the housing, the output shaft is oscillating motion about its own axis line driven by the motor and the transmission mechanism, the output shaft The free end connects the working head.

Preferably, the motor has a motor shaft, and an eccentric wheel and a fork assembly are connected between the motor shaft and the output shaft, so that the output shaft makes an oscillating motion about its own axis line.

Preferably, the mass of the working head is less than or equal to 20 g.

Preferably, the working head is provided with an opening.

The swinging frequency of the working head of the portable cutting machine provided by the invention is greatly improved compared with the working head swinging frequency of the conventional portable cutting machine, which can greatly improve the work quality and work efficiency.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments. 1 is a perspective view of a portable cutting machine according to a first embodiment of the present invention; FIG. 2 is a schematic view of the portable cutting machine of FIG.

Figure 3 is a schematic view of the portable cutting machine of Figure 1;

Figure 4 is a schematic view of the portable cutting machine of Figure 1;

Figure 5 is a cross-sectional view of the portable cutter of Figure 2 taken along line P-P;

Figure 6 is a perspective view of the portable cutter of Figure 1 after removing the left half casing;

Figure 7 is a perspective view of the portable cutting machine of Figure 6 after further removing the support base; Figure 8 is a perspective exploded view of the motor and drive shaft of the portable cutting machine of Figure 1; Figure 9 is the portable cutting of Figure 1. 3 is an exploded perspective view of the swing output shaft of the machine; FIG. 10 is a perspective view of the motor, the support base and the swing output shaft of the portable cutter described in FIG.

Figure 1 is a front elevational view of the side of the support of the portable cutting machine of Figure 10 for mating the motor, wherein the tool drive shaft and the shift fork are mounted on the support base;

Figure 12 is a bottom view of the support base of Figure 11;

Figure 13 is a partially exploded perspective view of the motor, the support base and the drive shaft of Figure 10; Figure 14 is a schematic view of the saw blade of the portable cutter of Figure 1;

Figure 15 is a perspective exploded view of the support assembly of the portable cutter of Figure 1; Figure 16 is a perspective view of the support assembly of the portable cutter of Figure 1;

Figure 17 is a schematic view showing the installation of a sector saw blade of the portable cutting machine of Figure 1;

Figure 18 is a partial cross-sectional view of the portable cutter of Figure 3, wherein the motor housing is partially cut away to show the air duct inlet;

Figure 19 is a cross-sectional view of the portable cutter of Figure 2 taken along line I-I;

20 is a schematic view of a saw blade of a portable cutting machine according to a second embodiment of the present invention; FIG. 21 is a schematic view of a saw blade of a portable cutting machine according to a third embodiment of the present invention; 4 is a schematic view of a saw blade of a portable cutting machine; FIG. 23 is a partial schematic view of the saw blade of FIG. 22, wherein the serrations extend in a direction opposite to the direction in which the base extends;

Figure 24 is a side elevational view of a portable cutting machine according to a fifth embodiment of the present invention; Figure 25 is a partially exploded perspective view of the portable cutting machine of Figure 24;

Figure 26 is a perspective view of the connector of the support assembly of Figure 25;

Figure 27 is a perspective view of the bottom plate of the support assembly of Figure 25; 28 is a schematic view of a support assembly according to a sixth embodiment of the present invention; and FIG. 29 is a schematic view of the support assembly of FIG. 28;

Figure 30 is a partially exploded perspective view of the support assembly of Figure 29;

FIG. 31 is a schematic diagram of a support assembly according to a seventh embodiment of the present invention; FIG.

Figure 32 is a schematic view of the support assembly of Figure 31;

Figure 33 is a perspective view of a portable cutting machine according to an eighth embodiment of the present invention, showing only the front end portion of the portable cutting machine;

Figure 34 is a cross-sectional view showing the oscillating portable cutting machine shown in Figure 33.

10. Portable cutting machine 42. Power cord 77. Pads

12. Housing 44. Drive shaft 78. Support base

14. Motor 45. First support bearing 80. First receiving chamber

15. Battery pack 46. Eccentric fittings 82. Second receiving chamber

16. Swing output shaft 47. Drive shaft support 83. Screw hole

18. Transmission mechanism 48. Fork 84. Opening

Mountain

19. 49. Containment Department 86. First opening

20. Saw blade 50. Shaft hole 87. Screw hole

21. Support assembly 51. Mating part 88. Second opening

22. Motor housing 52. Spline 89. Plug

23. Air inlet 53. Screw 90. Connection

24. Transmission mechanism housing 54. Eccentric shaft 92. Base

26. Battery pack compartment 55. Mounting parts 94. Mounting holes

28. Grip 56. Eccentric bearing 96. First side

32. Switch assembly 58. Drive unit 98. Surface

33. Guide assembly 60. Mounting portion 100. Serrated portion

34. Trigger 62. First drive arm 102. Base plate

35. Left half housing 64. First drive surface 104. Connection assembly

36. Control element 70. Tool mounting end 106. Saw blade slotting

37. Right half shell 72. Second support bearing 108. Guide assembly

38. Motor shaft 74. Third support bearing 112. Adjusting the slot

40. Motor fan 76. Fasteners 114. Locking screws 115, . nut 170. swing output shaft 224. upper surface

116, . Support 172. Support assembly 226 . Slotted

118, . Assembly 174. Fasteners 228 . Slotting against the plate

122. . Connecting plate 175. Washer 230. . Support assembly

124, . Air outlet 176. Saw blade 232, . Abutment plate

125, . baffle 178. fuselage casing 233, . abutment

126, . Air duct entrance 180. Head shell 234. . Guide assembly

128, . Through hole 182. Connector 235. . Portable cutting machine

130. . saw blade 184. bottom plate 236. , motor

132. . Mounting holes 186. First housing 238. , fork

134. . Connection 188. Second housing 240. . Motor shaft

136. , second side wall 190. circular hole 242. , concave and convex

138. , base 192. toroidal steel 圏 244. ■ sprinkler

139. Serrated 193. Screw hole 246. Coolant tank

140. Saw blade 194. Adapter 248. Housing

142. Mounting holes 196. Abutment plate 250. Upper bearing

144. Connection 198. Guide assembly 252, 254. Extension arm

146. Second side wall 200. Through hole 256. Working head

148. Base 202. Backplane screw holes 258. Working head cooling unit

150. Mounting holes 204. Screws 260. Eccentric pins

152. Saw blade 206. Fixing plate 262. Output shaft

154. Mounting holes 208. Rollers 264. Lower bearings

156. Connections 210. Slotting of the fixing plate 266. Eccentric wheel

158. Second side wall 212. Support assembly 268. Circulating cooling unit

160. Base 214. Connections 270. Pipes

162. Serrated 216. Base plate 182. Motor shaft bearing

164. First side 218. Mounting plate

166. Portable cutting machine 220. Abutment plate

168. Housing 222. Guide assembly

detailed description

Referring to FIG. 1, FIG. 5 and FIG. 6, a first embodiment of the present invention provides a portable cutting machine 10 package. The housing 12 includes a motor 14 housed in the housing 12, a battery pack 15 for supplying electrical power to the motor 14, a swing output shaft 16 driven by the motor 14, and a transmission mechanism between the motor 14 and the swing output shaft 16. 18. A saw blade 20 mounted on the oscillating output shaft 16 for cutting work, a support assembly 21 for supporting the portable cutter 10 against a surface of a workpiece to be cut (not shown).

The housing 12 includes a motor housing portion 22 having a longitudinally extending length, a transmission mechanism housing portion 24 for receiving the transmission mechanism 18, a battery pack housing portion 26 for housing the battery pack 15, and a transmission mechanism housing portion. 24 is a grip portion 28 that is connected and used for gripping.

Referring to Fig. 1, Fig. 3 and Fig. 4 together, the motor housing portion 22 has a hollow cylindrical shape as a whole, and the longitudinal extension of the motor housing portion is formed by the overall longitudinal extension. Along the longitudinal extension of the motor housing portion, the motor housing portion 22 is end-sealed to have an end wall 19, the other end of which is coupled to the transmission housing portion 24, and has a circumferential side wall circumferentially surrounding the motor 14. An air inlet hole 23 is provided in the end wall 19 to facilitate the circulation of the airflow for heat dissipation. A support strip (not shown) extending along a longitudinal extension direction of the motor housing portion is disposed on the circumferential side wall of the motor housing portion 22, and the support strip extends along the longitudinal direction of the motor housing portion. The circumferential arrangement and the number are not less than three for supporting the motor 14 stably in the motor housing portion 22.

The grip portion 28 and the motor housing portion 22 are disposed apart from each other, so that the vibration when the user grips the grip portion 28 is relatively small, thereby improving the user's comfort of use. The grip portion 28 extends longitudinally to form a longitudinal extension direction of the grip portion, and the longitudinal extension direction of the grip portion is different from the longitudinal extension direction of the motor housing portion, so that the portable cutting machine 10 is along the grip portion. The length of the longitudinal extension direction is reduced, so that the portable cutter 10 can be applied to a relatively narrow space, which facilitates the user's cutting work in a small space. In this embodiment, the longitudinal extension direction of the motor housing portion is perpendicular to the longitudinal extension direction of the grip portion, and the length of the portable cutter 10 along the longitudinal extension direction of the grip portion is minimized. The overall structural setting is optimized to optimize the adaptability of the portable cutter 10 to a narrow space.

Referring to FIG. 1 and FIG. 6, the battery pack accommodating portion 26 is connected to the transmission accommodating portion 24, and is disposed side by side with the grip portion 28, that is, extending along the longitudinal extension direction of the grip portion, when the user uses the portable cutting. When the machine 10 performs the cutting operation, the battery pack accommodating portion 26 is located on the side of the grip portion facing away from the user. The battery pack accommodating portion 26 has a hollow cylindrical shape, and one end thereof is connected to the transmission mechanism accommodating portion 24, and the other end thereof is sealed, so that a relatively sealed accommodating space is formed inside the battery pack accommodating portion 26, and the battery pack 15 can be prevented from being operated. The generated dust is contaminated or destroyed by the impact, and the battery pack 15 can be effectively prevented from being lost. In order to improve the stability of the portable cutting machine 10 during the cutting process, the surface of the battery pack accommodating portion 26 facing the workpiece can be abutted on the workpiece, so that the user can stably push the portable cutting machine 10 for cutting work without having to force the portable The cutting machine 10 is in a suspended state, thereby achieving improved cutting stability and saving the user's physical strength, which brings great convenience to the user. In order to enhance the wear resistance of the surface, an abrasion resistant coating may be provided on the surface, or other wear resistant members such as metal blocks may be installed.

Also mounted on the housing 12 is a switch assembly 32 that controls whether the portable cutter 10 is activated for operation. The switch assembly 32 includes a trigger member 34 for operation by a user and a control member 36 coupled to the battery pack 15 and the motor 14, and the user operable to control the control member 36 via the trigger member 34 to activate or deactivate the portable cutter 10. After the switch assembly 32 is assembled to the portable cutter 10, it is entirely located between the grip portion 28 and the battery pack accommodating portion 26 to facilitate user operation. In the present embodiment, the switch assembly 32 is disposed on the grip portion 28, and The control element 36 is housed inside the grip portion 28 to make reasonable use of the internal space of the grip portion 28, and is easy for the user to operate.

In order to facilitate the manufacturing of the housing 12, the housing 12 may be divided into a left portion consisting of a part of the transmission mechanism accommodating portion 24, a portion of the grip portion 28 and a portion of the battery pack accommodating portion 26 along the longitudinal extension direction of the grip portion. The half casing 35 and the right half casing 37 composed of the motor housing portion 22, the partial transmission mechanism accommodating portion 24, the partial grip portion 28, and the partial battery pack accommodating portion 26. The left and right half-shells 35, 37, respectively, are integrally formed, so that the housing 12 is easily fabricated and assembled, and is easy to assemble.

The battery pack 15 is housed in the battery pack accommodating portion 26, and is composed of five battery cells, and has a rated voltage of 18 V, which is sufficient for the portable cutter 10 to have sufficient power during operation and excellent portability. The battery pack 15 is connected to a power cord 42 for charging to the external power source for charging the battery pack 15.

Further, the portable cutter 10 can also be powered by the AC power source without the battery pack 15, and the battery pack accommodating portion 26 is not required to be provided on the casing 12, thereby reducing the overall volume. In addition, it saves costs.

Referring to FIG. 2 and FIG. 5, the motor 14 is housed inside the motor housing portion 22, and includes a stator, a rotor, a motor shaft 38 extending in the same direction as the longitudinal direction of the motor housing portion, and a motor shaft 38 mounted thereon. The motor 14 heats the motor fan 40. The motor fan 40 is located between the rotor and the end wall of the motor housing portion 22 along the longitudinal extension direction of the motor housing portion. When the motor fan 40 rotates, the airflow can be driven from the air inlet hole 23 into the motor housing portion 22 to be blown. The stator and the rotor achieve heat dissipation.

In this embodiment, the motor 14 is a DC motor, and if the portable cutter 10 is set to be pluckable When AC power is supplied, the corresponding motor 14 can also be an AC motor.

The rated speed of the motor 14 is greater than or equal to 20,000 rpm, and the further motor 14 has a rotational speed of more than 30,000 rpm. At this time, the portable cutting machine 10 has a strong power and a good service life.

Referring to FIG. 1 , FIG. 7 and FIG. 8 , the transmission mechanism 18 is received in the transmission receiving portion 24 , and includes a driving shaft 44 , a first supporting bearing 45 sleeved on the driving shaft 44 , and the first supporting bearing 45 An interference fit to support the drive shaft support 47 of the drive shaft 44, an eccentric 46 mounted on the drive shaft 44 and a shift fork 48 that cooperates with the eccentric 46. In the present embodiment, the eccentric member 46 and the shift fork 48 constitute a motion converting mechanism for converting the rotation of the output of the motor 14 into the swing of the swing output shaft 16, to drive the saw blade 20 to perform the swing cutting.

The drive shaft 44 is disposed coaxially with the motor shaft 38 such that the drive shaft 44 extends in the same direction as the longitudinal direction of the motor housing portion. The drive shaft 44 is independent of the motor shaft 38 and is driven by a motor shaft 38 having a drive shaft axis 0-0. The drive shaft 44 has a shaft hole 50 for mating with the motor shaft 38 at one end and an eccentric member 46 at the other end. The shaft hole 50 has a hexagonal shape with a central symmetry, and the motor shaft 14 is matched with the shaft hole 50 so that the cooperation between the two is stable and there is no relative sliding.

In order to reduce the vibration of the drive shaft 44 and the motor shaft 14, a spline 52 is disposed in the shaft hole 50, and a shock absorbing layer is disposed on the outer surface of the spline 52, and the shock absorbing layer may be made of rubber, resin or the like.

Of course, the drive shaft 44 can be directly formed by the motor shaft 38. In this case, the spline 52 is not required, and the eccentric member 46 is mounted on the motor shaft 38 to cooperate with the shift fork 48, so that the structure is simple, easy to manufacture, and the transmission process. The vibration is small.

The eccentric 46 has a centerline SS, and the direction in which the centerline SS extends is parallel to the drive shaft axis 0-0, but the centerline SS is not collinear with the driveshaft axis 0-0, such that the eccentric 46 is on the drive shaft 44. Driven eccentrically around the axis 0-0 of the drive shaft. In the present embodiment, the eccentric member 46 includes an eccentric shaft 54 and an eccentric bearing 56 that is sleeved on the eccentric shaft 54. The centerline S-S of the eccentric shaft 54 is aligned with the drive shaft axis 0-0 but not collinearly, such that the eccentric bearing 56 is eccentrically moved with respect to the drive shaft axis 0-0 following the eccentric shaft 54. The eccentric bearing 56 has an outer surface that cooperates with the shifting fork 48 to drive the shifting fork 48 to swing.

The drive shaft support 47 includes a receiving portion 49 for receiving the first support bearing 45, and a fitting portion 51 disposed around the receiving portion 49 and for fixedly mounting to the housing 12. The accommodating portion 49 has a hollow cylindrical shape. When the first support bearing 45 is attached to the accommodating portion 49, it has an interference fit with the inner side wall of the accommodating portion 49, thereby realizing the position of the first support bearing 45 to be stably defined. , thereby enabling the drive shaft 44 to Stable support is within the drive shaft support 47. The mating portion is fixedly attached to the motor housing portion 22 by screws 53a and screws 53b, thereby realizing the positional fixing of the drive shaft support 47.

Further, in order to make the position of the motor 14 more stable, a fixing member 55 is mounted on one end of the accommodating portion 49 facing away from the motor 14, and the fixing member 55 penetrates the screw hole on the driving shaft support member 47 and the motor 14 through two screws. The phase is threaded to achieve a fixed position of the motor 14 along the direction of extension of the drive shaft axis 0-0.

After the drive shaft 44 is mounted to the drive shaft support 47, the eccentric member 46 projects from the central portion of the receiving portion 49 and the fixing member 55 to cooperate with the shift fork 48 to drive the shift fork 48 to swing.

The shift fork 48 is fixedly mounted on the swing output shaft 16 and extends in the circumferential direction of the swing output shaft 16 to protrude from the swing output shaft 16, and its extending direction forms a shifting fork extending direction. During the operation of the portable cutter 10, the trajectory of the eccentric member 46 is in the plane of the vertical drive shaft axis 0-0. During the engagement of the eccentric member 46 with the shift fork 48, the friction between the two is generated. The direction of the force is coplanar with the plane in which the motion trajectory is located, that is, the direction of the friction force is perpendicular to the axis 0-0 of the drive shaft. Since the direction in which the fork extends is different from the direction in which the motor shaft extends, the friction force applied by the eccentric 46 to the fork 48 in a direction perpendicular to the direction in which the fork extends is partially offset by itself. Thereby, the vibration of the shift fork 48 in the direction perpendicular to the direction in which the shifting fork extends is reduced. In this embodiment, the shifting fork extending direction is perpendicular to the driving shaft axis 0-0 extending direction, so that the eccentric member 46 does not have a displacement perpendicular to the shifting fork extending direction with respect to the shifting fork 48, The frictional force perpendicular to the direction in which the shifting fork extends is not generated between the eccentric member 46 and the shifting fork 48, so that the shifting fork 48 does not generate vibration in the direction perpendicular to the extending direction of the shifting fork. Therefore, the eccentric member 46 does not generate a displacement perpendicular to the second longitudinal extension direction with respect to the shifting fork 48, so that the transmission mechanism 18 is substantially free from vibration or vibration, and the portable cutter 10 can be A motor with a rotational speed of 20,000 rpm or more is used, and even a motor with a rotational speed greater than 30,000 rpm is used, and the operating comfort is better.

Referring to Fig. 7 and Fig. 9, the shifting fork 48 includes a driving portion 58 extending integrally with the extending direction of the shifting fork and engaging with the eccentric member 46, and a mounting portion 60 connected to the swinging output shaft 16.

The driving portion 58 includes a first driving arm 62a and a second driving arm 62b that respectively extend along the extending direction of the fork and are spaced apart from each other. The first driving arm 62a has a first driving surface 64a in contact with the eccentric member 46, the second driving arm 62b has a second driving surface 64b in contact with the eccentric member 46, and the first driving surface 64a is coupled to the second driving surface 64b. Faced, the eccentric 46 is thereby sandwiched between the first drive surface 64a and the second drive surface 64b. Both the first driving surface 64a and the second driving surface 64b are simultaneously in contact with the eccentric member 46, so that the vibration between the shifting fork 48 and the eccentric member 46 is reduced. In order to make the structure of the shift fork 48 more stable, a connecting arm 64 is provided between the first driving arm 62a and the second driving arm 62b, and the connecting arm 64 is integrally formed with the first driving arm 62a and the second driving arm 62b. It is made to thereby optimize the overall stress strength of the shift fork 48.

The mounting portion 60 is for fixed connection with the swing output shaft 16 to drive the swing output shaft 16 to swing. In the present embodiment, the mounting portion 60 is a body fixedly coupled to the swing output shaft 16, and a connecting hole for being sleeved on the swing output shaft 16 is formed at the center of the body.

Referring to FIG. 6, FIG. 7 and FIG. 10 together, in order to prevent the eccentric member 46 and the shift fork 48 from being contaminated by dust, to avoid damage caused by large friction between the two, a closed seal is arranged in the portable cutter 10. The accommodating space, the eccentric member 46 and the shifting fork 48 are housed in the accommodating space to keep the two from being polluted by dust and maintain a lubricating fit state. In the present embodiment, the portable cutter 10 is further provided with a support base 78 in the housing 12, and the support space is formed by the support base 78 and the drive shaft support 47.

Referring to FIG. 7 , FIG. 11 , and FIG. 12 , a first receiving cavity 80 for receiving the eccentric member 46 and the partial shifting fork 48 is formed in the supporting base 78 , and is connected to the first receiving cavity and is mainly used for The second receiving cavity 82 of the swing output shaft 16 is housed. The first receiving cavity 80 has an open end that is matched with the receiving portion 49 of the driving shaft support 47. When the driving shaft support 47 is assembled to the supporting base 78, the solid portion of the receiving portion 49 is received in the open end. Thereby, the eccentric member 46 can be extended into the first receiving cavity 80 to cooperate with the shifting fork 48. Further screws 53 a and screws 53 b are screwed to the screw holes 83 a and the screw holes 83 b provided on the support base 78 to realize a fixed connection between the housing 12 , the drive shaft support 47 and the support base 78 , thereby The structure of the portable cutter 10 is stabilized.

Referring to FIG. 1 1 , FIG. 12 and FIG. 13 , in order to facilitate the mounting of the swing output shaft 16 to the support base 78 , an opening 84 is provided on the side wall of the second receiving cavity 82 away from the first receiving cavity 80 , and along A first opening 86 and a second opening 88 are formed in the direction of the drive shaft axis 0-0 of the motor 14 to accommodate the partial swing output shaft 16, respectively. After the shifting fork 48 extends from the opening 84 into the receiving space, the swinging output shaft 16 is extended from the first opening 86 into the second receiving cavity 82 and assembled with the shifting fork 48, thereby realizing the swinging output shaft 16 and The shift fork 48 is mounted to the support base 78. Further, the support base 78 is provided with a plug block 89 shaped to the opening 84, so that after the swing output shaft 16 and the shift fork are mounted to the support base 78, the inside of the support base 78 forms a closed receiving space, that is, at this time. The first receiving cavity 80 and the second receiving cavity 82 form the receiving space in which the eccentric member 46 and the shifting fork 48 are hermetically sealed.

In the present embodiment, in order to provide the support base 78 with better stress strength and better heat dissipation, the support base 78 is made of a metal material, preferably it is made of an aluminum alloy material.

Referring to FIG. 14, a snail for fixed connection with the support assembly 21 is further disposed on the support base 78. The hole 87, thereby enabling the support assembly 21 to be securely attached to the portable cutter 10. Since the housing 12, the motor 14, the transmission mechanism 18, the swing output shaft 16 and the support assembly 21 in the portable cutter 10 are directly fixedly coupled to the support base 78, the various components of the portable cutter 10 are closely connected. Together, the overall stress strength is optimized and the vibration is minimized.

Referring to FIG. 7 and FIG. 9 together, the swing output shaft 16 has an output shaft axis RR, and the swing frequency of the swing output shaft 16 around the output shaft axis RR is greater than or equal to 20,000 rpm, thereby further driving the saw blade 20 to perform cutting work. Higher cutting efficiency, and further, the swinging output shaft 16 has a swing frequency greater than 30,000 rpm, which results in better cutting efficiency.

The output shaft axis R-R of the swing output shaft 16 is set in parallel with the drive shaft axis 0-0. In this way, during the operation of the swing output shaft 16, the displacement along the R-R direction of the output shaft axis is not generated by the shift fork 48, so that the vibration of the swing output shaft 16 is reduced, and the cutting process is more stable.

When the portable cutting machine 10 performs the cutting work, the direction of the friction force generated between the eccentric member 46 and the shift fork 48 is perpendicular to the drive shaft axis 0-0. At this time, since the shift fork 48 and the swing output shaft 16 are fixedly connected, So that the shift fork 48 and the swing output shaft 16 are subjected to the friction force perpendicular to the drive shaft axis 0-0 at this time, since the output shaft axis RR of the swing output shaft 16 and the drive shaft axis 0-0 are arranged in parallel with each other, The direction of the friction force is perpendicular to the output shaft axis RR, so that the swing output shaft 16 is not subjected to the frictional force in the direction in which the output shaft axis RR extends, so that it does not cause displacement along the direction in which the output shaft axis RR extends. Therefore, when the portable cutting machine 10 performs the cutting work, the swing output shaft 16 is oscillated only by the transmission mechanism 18, and does not generate displacement along the direction of its own output shaft axis RR, which is extremely large. The vibration generated by the portable cutter 10 during operation is reduced, and the operation comfort is improved. In the present embodiment, the output shaft axis RR of the swing output shaft 16 is parallel to the drive shaft axis 0-0 of the drive shaft 44, and perpendicular to the direction in which the shift fork extends, at which time the vibration of the portable cutter 10 is minimized. , the operating comfort is optimal.

One end of the swing output shaft 16 along the output shaft axis RR is a tool mounting end 70 on which the saw blade 20 is mounted, and the other end is provided with a second support bearing 72, and a tool is also disposed between the tool mounting end 70 and the second support bearing 72. The three support bearings 74 enable the swing output shaft 16 to be stably supported. The shift fork 48 is connected between the second support bearing 72 and the third support bearing 74 through the mounting portion 60, so that the shift fork 48 can stably swing the swing output shaft 16.

Referring to FIG. 9 and FIG. 12, after the swing output shaft 16 is mounted to the support base 78, the second support bearing 72 and the third support bearing 74 are respectively associated with the first opening 86 and the second opening of the support base 78. The inner side wall of 88 is interference fit to achieve the position defining the second support bearing 72 and the third support bearing 74. The position of the swing output shaft 16 is defined, and the second receiving cavity 72 and the third support bearing 74 are mounted to close the second receiving cavity 82 and the swing output shaft 16, thereby preventing dust from entering. The interior of the containment space further avoids contamination of the eccentric 46 and the shift fork 48.

The tool mounting end 70 is in the shape of a polyhedron for adapting the saw blade 20. A fastener 76 is also mounted to the tool mounting end 70 for securing the blade 20 between the fastener 76 and the tool mounting end 70, thereby effecting mounting of the blade 20 to the portable cutter 10. In the present embodiment, the tool mounting end 70 has a threaded bore, and the fastener 76 is shaped with the threaded bore and has an end exposed to the threaded bore to clamp the saw blade 20 at the end and Between the tool mounting ends 70. Also, a spacer 77 is sleeved on the fastener 76, thereby effectively preventing looseness between the fastener 76 and the tool mounting end 70, thereby achieving stable mounting of the saw blade 20.

The swinging output shaft 16 has a swing frequency of 20,000 times/min or more in operation, and its swing frequency can be set to be more than 30,000 beats/min, so that the portable cutter 10 has higher cutting efficiency. In the present embodiment, the rotational speed of the swing output shaft 16 is equal to 20,000 beats/min, so that the portable cutter 10 has a long service life while satisfying high cutting efficiency.

Referring to Fig. 14, the saw blade 20 is mounted on the swing output shaft 16 and swings together with the swing output shaft 16, so that when the swing frequency of the swing output shaft 16 is greater than or equal to 20,000 times/min, the swing frequency of the saw blade 20 is also Similarly, it is greater than or equal to 20,000 times/minute. Correspondingly, when the swing frequency of the swing output shaft 16 is greater than 30,000 beats/min, the swing frequency of the saw blade 20 is also greater than 30,000 beats/min. In the present embodiment, the swing frequency of the saw blade 20 is equal to 20,000 beats/min.

The saw blade 20 includes a longitudinally extending connecting portion 90 and a base portion 92.

The connecting portion 90 has a flat plate shape and has two first side walls 92a and second side walls 92b which are opposite and extend along the longitudinal direction of the connecting portion 90, and are uniform with the first side wall 92a and the second side wall 92b. Adjacent, and having a third side wall 92c of the mounting hole 94. A first side 96a and a second side 96b are formed at positions where the first side wall 92a and the second side wall 92b are adjacent to the third side wall 92c, respectively.

The third side wall 92c is provided with a circular arc-shaped transition of the periphery of the mounting hole 94 halfway around the mounting hole 94, and the center of the circular arc coincides with the center of the mounting hole 94, which can save the portable cutting machine 10 as the saw blade 20 The reserved space allows the saw blade 20 to be more smoothly engaged with the portable cutter 10 when it is swung.

The shape of the mounting hole 94 may be a polygonal shape, a circular shape, or other centrally symmetrical shapes. In the present embodiment, the mounting hole 94 has a polygonal shape, which can be matched with the polyhedral shape of the tool mounting end 70 to realize the swing output shaft. When the output swings, the saw blade 20 can be driven without relative sliding, and the saw blade 20 can be limited to a plurality of different angular positions as needed. When the saw blade 20 is assembled to the portable cutter 10, the mounting hole 94 is sleeved on the swing output shaft 16 and passed through the fastener 76. Fasten the relative positional relationship between the two. When the portable cutter 10 is in operation, the saw blade 20 is driven by the oscillating output shaft 16 to form an oscillating plane perpendicular to the output shaft axis RR of the oscillating output shaft 16, i.e., the oscillating plane and the grip The longitudinal extension of the holding portion is arranged in parallel so that the user pushes the portable cutting machine 10 through the grip portion 28 to perform the cutting work. In the present embodiment, the extending planes of the first side wall 92a and the second side wall 92b are both perpendicular to the swinging plane.

The base portion 92 extends in the direction from the first side 96a to the second side 96b, and the connecting portion 90 is protruded from a position where the second side wall 92b is away from the mounting hole 94, and the base portion 92 is a portion after the connecting portion 90 is protruded. The base portion 92 has a cutting portion on a side away from the mounting hole 94 in the longitudinal direction of the connecting portion 90, i.e., the cutting portion is located at an end of the saw blade 20 away from the swing output shaft, and the base portion 92 has a surface 98 adjacent to the cutting portion. In the present embodiment, the base portion 92 extends only in the direction of the first side 96a to the second side 96b, and the cutting portion is a sawtooth portion 100 composed of a plurality of saw teeth. When the workpiece is cut, the surface 98 is coplanar with the swing plane.

In the present embodiment, the base portion 92 extends uniformly from the second side wall 92b to the connecting portion 90, that is, the width along the extending direction thereof is constant, so that the stress intensity of the base portion 92 is better, and the workpiece is cut by the sawtooth portion 100. It is not easy to break during the process. Each of the serrations on the serrations 100 includes a tooth tip and a tooth root. The tooth tips are arranged along a straight line to form a cutting line. Under the driving of the swing output shaft 16, the linearly arranged tooth tips continuously oscillate and cut the workpiece. And having a better cutting efficiency, the root is used to securely connect the serration to the base 92.

In order to adapt to the portable cutting machine 10 for swing cutting, it is limited to the swing angle of the portable cutter 10 and the distance between the tips of the adjacent saw teeth, so that the length of the connecting portion along its own longitudinal direction must be able to satisfy the The distance of the sawtooth swing is greater than the distance of the tooth tip of the adjacent sawtooth, and the specific size is not described in detail herein.

The length L of the base portion 92 along the extending direction thereof and the width W with respect to the extending direction thereof may be set to different sizes according to different use requirements. For example, the length L of the base portion 92 may range from 2 mm to 80 mm, wherein The preferred length may be selected from 15 mm to 40 mm, preferably from 20 to 35 mm. The width W of the base portion 92 may range from 5 mm to 1 1 mm, with a preferred width being selected from 7 mm, 8 mm, and 9 mm, i.e., 7 mm to 9 mm. Selecting the above-described preferred length and width of the saw blade 20 enables the cutting workpiece to achieve a better cutting effect.

The connecting portion 90 may be divided into two parts, that is, one portion is provided with a mounting hole 94, and the other portion is provided with a base portion 92. The portion of the connecting portion 90 having the mounting hole 94 is thicker than the portion provided with the base portion 92, and the two portions are fixedly connected by welding, riveting, etc., so that the saw blade 20 can be processed and manufactured according to the connecting portion 90. The functional uses between the zones are set to different thicknesses The blade 20 has a better stress strength and a better cutting effect. Depending on the needs of use, the cutting line of the serrations 100 and the first side wall 92a may be disposed at different angles δ, and the angle δ may range from 65. To 120. Wherein the preferred angle value may be selected from 80° to 10°. The angle δ is selected from the above preferred angle values to make the cutting performance of the saw blade 20 to a better state.

In order to make the connection structure of the base portion 92 and the connecting portion 90 more stable, the saw blade 20 does not break at the joint of the base portion 92 and the connecting portion 90 during the cutting of the workpiece, and may be opposite to the surface of the serration portion 100 at the base portion 92. The junction of the second side wall 92b of the connecting portion 90 is provided as a camber transition, and at this time, the base portion 92 is a portion of the arcuate surface that extends beyond the connecting portion 90.

The base portion 92 and the connecting portion 90 may be formed without a unitary structure, that is, the base portion 92 and the connecting portion 90 are fixed together by welding or riveting. At this time, the surface 98a is parallel to the oscillating plane.

In order to improve the safety of the saw blade 20 during the cutting of the curved surface, the end wall of the connecting portion 90 adjacent to the cutting portion 100 is not provided with serrations, preferably in a planar arrangement. Thus, when the user performs the cutting work, if the end wall protrudes into the workpiece inside by mistake, the user cannot push the portable cutting machine 10 to cut forward, thus avoiding the user changing the cutting direction and causing the connecting portion to change the cutting direction. 90 is broken by the workpiece, further avoiding the broken part flying out to hurt the user.

Of course, in order to increase the effective cutting length when the saw blade 20 is not used for cutting the curved surface, the serration may be provided on the end surface of the connecting portion 90 away from the mounting hole 94, and the serration of the connecting portion 90 is arranged in line with the serration of the serration portion 100. At the same time, in order to facilitate the cutting of a position on the plane of the workpiece when the blade 20 is used alone, a bevel may be provided on the connecting portion 90, and the bevel may be disposed between the mounting hole 94 and the connection position of the connecting portion 90 and the base portion 92. Of course, the saw blade 20 may have only the serrations 100 without providing serrations on the connecting portion 90 and without the bevel.

The saw blade 20 realizes the output of the saw blade 20 by modifying the structure of the conventional saw blade. The swinging portable cutter can cut the curved surface on the workpiece and expand the function of the conventional swing cutter. That is, when the user cuts the workpiece using the saw blade 20 of the present invention, the cutting can be performed only by the base portion 92, since the width of the base portion is narrow and extends from the side of the connecting portion of the saw blade, the swing output is at the swing Under the driving of the shaft, a curved surface of any shape can be cut on the surface of the workpiece, which brings convenience to the user's work and life, and greatly satisfies the needs of the user.

Referring to Figures 1, 15 and 16, the portable cutter 10 is placed against the workpiece by the support assembly 21 for cutting work. The support assembly 21 includes a base plate 102 for abutting against a surface of the workpiece, and a connection assembly 104 for connecting the base plate 102 to the portable cutter 10. The bottom plate 102 has a substantially flat plate shape and has an abutting surface for abutting against the workpiece for abutting against the surface of the workpiece when the portable cutting machine 10 cuts the workpiece, so that the cutting operation is more stable, and the cutting process can be reduced. The vibration in the middle prevents damage to the saw blade 20 due to vibration. When the base plate 102 is assembled to the portable cutter 10, the output shaft axis RR of the swing output shaft 16 is parallel to the abutment surface, thereby facilitating the use of the saw blade 20 to cut the workpiece in a direction perpendicular to the abutment surface. When the portable cutter 10 is abutting against the surface of the workpiece for cutting work, the projection of the center of gravity of the portable cutter 10 on the surface of the workpiece is located in the abutment surface, so that the portable cutter 10 can be stably supported without the side being present. turn.

A blade slot 106 extending along the long side is disposed on the base plate 102 for the blade 20 to extend from the blade slot 106 and through the abutment surface for cutting operations.

A guide assembly 108 is disposed at one end of the blade slot 106 away from the swing output shaft 16. The guide assembly 108 is used to provide guidance for the swinging process of the saw blade 20 to reduce the vibration of the saw blade 20 during the swinging of the workpiece. In the present embodiment, the guide assembly 33 includes a first guide roller 108a and a second guide roller 108b which are disposed opposite to each other on the blade slot 106. When the portable cutter 10 cuts the workpiece, the saw blade 20 is held between the first guide roller 108a and the second guide roller 108b, and abuts against one of the rollers when the saw blade 20 cuts the curved surface (the first guide roller) 108a or the second guide roller 108b), at this time, the roller (the first guide roller 108a or the second guide roller 108b) is rotated, so that the swinging motion of the saw blade 20 is not hindered, and thus the cutting surface can be cut. During the process, the saw blade 20 is prevented from shifting, thereby greatly improving the overall cutting accuracy and reducing the risk of the saw blade 20 being severely broken due to vibration. Preferably, the area of the saw blade 20 that is in contact with the first guide roller 108a or the second guide roller 108b is adjacent to the sawtooth portion 100, and the distance of the contact area from the root is greater than 1 mm and less than 20 mm. The guiding and damping effect of the guiding assembly 33 is better, and a distance of 1 mm is reserved between the two guiding rollers and the root, thereby effectively avoiding the guidance caused by the tolerance of the guiding roller. There is a problem of wear between the roller and the serration.

The abutment surface of the bottom plate 102 is not limited to a rectangular shape, and it may be formed into other shapes such as a circle, a triangle, other polygons, and the like.

The position of the bottom plate 102 relative to the swing output shaft 16 is adjustable so that the bottom plate 102 can be adapted to different sizes of saw blades to meet the needs of different operating conditions. In this embodiment, the swinging plane of the saw blade 20 is perpendicular to the abutting surface, so that the projection of the swinging plane on the abutting surface is a straight line, and the bottom plate 102 can only extend along the extending direction of the straight line. Adjusting the position relative to the swing output shaft 16, as shown in FIGS. 1 and 17, is configured such that the bottom plate 102 can be adapted to different sizes of the saw blade, And the structure is simple and easy to adjust.

Between the bottom plate 102 and the connection assembly 104 is coupled by a locking mechanism, and the locking mechanism is operable to release the bottom plate to enable a first state of adjustment relative to the swing output shaft, and to lock the bottom plate relative to the swing The second state of the output shaft position is achieved, thereby enabling the user to fix the position of the bottom plate 102 as needed.

In the present embodiment, the locking mechanism includes a boss 110 disposed on a surface of the bottom plate 102 facing away from the abutting surface, a locking screw 114 passing through the boss 110 and threadably coupled to the connecting component 104, and A nut 115 corresponding to the locking screw 114.

The boss 110 has a long side and a short side perpendicular to each other, and the long side thereof is parallel to the long side of the bottom plate 102, and correspondingly, a groove is formed on the abutting surface corresponding to the position of the boss 110 to receive the locking screw 114. . An adjusting slot 112 is formed in the boss 110 and extends through the boss 110 and extends in the same direction as the blade slot 106. The locking screw 114 is mounted in the recess on the side of the abutting surface and passes through The adjustment slot 112 is threadedly coupled to the connection assembly 104.

In the present embodiment, the number of the locking screws 114 is two, so that the position of the bottom plate 102 can be stably defined, and a gasket is disposed between the locking screw 114 and the bottom plate 102 to prevent the locking screw 114 from damaging the bottom plate. 102.

When the user needs to use different saw blades for cutting work, the position of the bottom plate 102 needs to be adjusted, so that the guiding assembly 33 can be adapted to different sizes of each saw blade, and the user can loosen the locking screw 114, and the bottom plate 102 can By adjusting the slot 112 to slide relative to the locking screw 114, the bottom plate 102 can be adjusted in position relative to the swing output shaft 16 in the cutting direction, in this case the first state of the locking mechanism; when the user adjusts the bottom plate 102 The position, and the locking screw 114 is locked, at which point the bottom plate 102 is locked relative to the swing output shaft 16 to effect the locking mechanism in the second state.

The connector assembly 104 includes a seat 116 that is coupled to the locking screw 114 and an assembly 118 for mounting to the portable cutter 10.

The holder 116 is mounted to the boss 110 of the bottom plate 102, and the holder 116 has a guide plate that provides guidance when the boss 110 moves. In this embodiment, the guide plates are opposite side plates 118 disposed on the support 116, and the two side plates 120 are respectively located on one side of the boss 110, so that the boss 110 is sandwiched between the two sides. Between the plates 120, and the surfaces of the side plates 120 facing the bosses 110 are fitted to each other, so that stable positioning can be performed by the two side plates 120 when the bottom plate 102 is adjusted.

A connecting plate 122 is disposed between the two side plates 120, and a screw hole corresponding to the locking screw 114 is disposed on the connecting plate 122 for passing the locking screw 114 through the screw hole to be in contact with the nut 115. Thread Connected.

The assembly 1 18 is fixed by screws to one side of the holder 1 16 facing away from the bottom plate 102, and further fixed to the support base 78 in the housing 12 by screws, thereby achieving the fixing of the support assembly 21. Since the support base 78 is a metal member, the stress strength is good, so that the support assembly 21 can be stably mounted on the support base 78.

When the portable cutting machine 10 cuts the workpiece, it will abut against the surface of the workpiece through the support assembly 21, at which time the saw blade 20 is cut by the swing output shaft 16, and the third side wall 92c of the saw blade 20 is perpendicular to the bottom plate 70. The abutment surface. In the present embodiment, the angle between the abutting surface and the cutting line of the serration portion 100 is α, the angle at which the swing output shaft 16 outputs the swing angle is β, and when the swing output shaft 16 is at the β/2 swing angle The angle of the angle between the abutting surface and the cutting line is γ, and the maximum angle of α is γ+β/2, and the minimum angle of α is γ-β/2. Wherein, the value of γ is selected from 80° to 100°. At this time, the portable cutting machine 10 has a relatively good cutting effect, and preferably the value of γ is 90°, which can make the portable cutting machine 10 optimal. Cutting effect. The value of β can be 2.8°, 3.2° or 4°, etc., and the range of α can be obtained by calculation, for example, when γ is 80. And β is 3.2. When α is in the range of 78.4° to 81.6°; when γ is 90° and β is 3.2°, α ranges from 88.4° to 91.6. The rest of the situation is no longer here - enumeration.

In order to speed up the heat dissipation speed of the saw blade 20 during the cutting operation, a fan may be disposed in the housing 12 of the portable cutter 10, and an air outlet toward the saw blade 20 may be disposed at a position of the housing 12 near the saw blade 20, and A duct for the airflow is formed between the fan and the air outlet, so that the fan can drive the airflow to flow through the air duct and the air outlet to the saw blade 20, thereby speeding up the saw blade 20. The cooling rate, thus avoiding the temperature of the saw blade 20 from being too high and breaking, also avoids the user being exposed to the saw blade 20 and being burnt.

Referring to FIG. 1 and FIG. 1 , in the present embodiment, the air outlet 124 is disposed on the casing 12 along the circumferential direction of the output shaft axis RR of the swing output shaft 16 , and the air outlet faces the connecting portion 90 of the saw blade 20 . In the direction in which the longitudinal direction extends, the airflow flowing out of the air outlet 124 can be passed through the surface of the saw blade 20 with the largest area, so that the heat dissipation effect is optimal.

The fan is mounted on a motor shaft of the motor 14, which is a motor fan 40 that dissipates heat from the motor, and a through air passage is disposed between the motor housing portion 22 and the air outlet 124 to enable airflow generated by the motor fan 40 to pass through. The air duct flows toward the air outlet 124 and flows from the air outlet 124 to the saw blade 20. In the present embodiment, the motor housing portion 22 is provided with the duct inlet 126 along the circumferential side wall side of the drive shaft axis 0-0, and the duct inlet 126 is adjacent to the motor 14, so that airflow can be achieved into the wind. Before the road, the heat generated by the working process of the motor 14 can be taken away first, so that the airflow generated by the operation of the motor fan 40 can be fully utilized while dissipating heat for the motor 14 and the saw blade 20.

Referring to FIG. 18 and FIG. 19 together, the air duct inlet 126 of the air duct is disposed on the right half casing 37, and the air outlet 124 is disposed on the left half casing 35, so the air passage needs to be right. The half-shell 37 extends to the left half-shell 35, wherein the air passage passes through the support base 78, and the airflow flowing through the air passage can carry away the heat generated by the cooperation of the eccentric 46 and the fork 48, thereby Achieve heat dissipation for the transmission mechanism.

In the present embodiment, a through hole 128 penetrating the support base 78 is formed at a position on the support base 78 corresponding to the right half case 37 and the left half case 35, at which time the air passage inlet 126 of the right half case 37 is formed. The through hole 128 to the support base 78 finally reaches the air outlet 124 of the left half casing 35 to form a clear air passage. At this time, the air flow generated by the motor fan 40 can first dissipate heat for the motor 14, and then the air flow from the air passage. After the inlet 126 enters the air passage, it will flow through the through hole 128, and the air flow will take away the heat generated by the eccentric 46 and the fork 48 on the support base 78, and finally the air flow flows from the air outlet 124 to the air outlet 124. The saw blade 20 further dissipates heat from the saw blade 20, thereby achieving optimum heat dissipation performance of the portable cutter 10 by providing the air passage.

In order to prevent the airflow of the air passage from flowing directly through the eccentric 46 and the shifting fork 48, the dust carried by the air dampers the eccentric 46 and the shifting fork 48, so that the through hole 128 does not communicate with the receiving space, but preferably The thickness of the sidewall between the two is less than 20 mm, and the heat dissipation effect is better for the receiving space. Preferably, the side wall has a thickness of 5 mm or less, such as 5 mm, 4 mm, 3 mm, 2 mm, 1 mm or 0.5 mm.

In order to increase the airflow intensity entering the air duct inlet 126, the motor fan 40 is designed as a centrifugal fan, so that the air duct inlet 126 is arranged along the circumferential direction of the motor housing portion 22, so that the flow velocity of the airflow in the air duct is increased, and thus Better heat dissipation. Further, the circumferential side wall of the motor housing portion 22 gradually increases in inner diameter along the direction from the air inlet hole 23 to the air duct inlet 126, so that the flow velocity of the airflow passing through the air passage is further increased, and the heat dissipation efficiency is achieved. optimal.

Referring to FIG. 1, the left half casing 35 is provided with a baffle 125, and the baffle 125 is disposed at a circumferential position of a portion of the swing output shaft 16 extending from the casing 12, and the air outlet 124 is disposed on the baffle 125 to realize the outflow. The airflow is blown toward the cutting direction of the saw blade 20, and the heat generated by the saw blade 20 can also blow off the debris generated during the saw blade cutting process, so that the cutting work has a better line of sight.

Of course, a person skilled in the art may also provide a cooling fan independent of the motor fan 40 in the housing 12. The cooling fan may directly set the position corresponding to the air outlet 124, so that the airflow flowing out from the air outlet 124 is fast. The heat dissipation to the saw blade 20 is optimized. Of course technology in the field Other design changes may be made by persons, but as long as their functions and effects are the same or similar to the present invention, they should be covered by the scope of the present invention.

Referring to Figure 20, a saw blade 130 for a portable cutter provided for the second embodiment. The saw blade 130 includes a connecting portion 134 having a mounting hole 132, and a base portion 138 extending from the second side wall 136b of the connecting portion 134, and a serration portion 139 provided on the base portion 138.

The function and structure of the saw blade 130 are substantially the same as those of the saw blade 20 provided by the first embodiment, except that the horizontal distance of the connecting portion 134 away from the end surface of the mounting hole 132 to the center of the mounting hole 132 is greater than any point on the base 138. The horizontal distance of the center of the mounting hole 132, that is, the end of the connecting portion 134 away from the mounting hole 132, horizontally protrudes from the base 138. When the portable cutting machine cuts the curved surface on the workpiece through the saw blade 130, only the base portion 138 can cut in the slit of the workpiece cut, and the convex portion of the connecting portion 134 is blocked by the workpiece plane, so that the connecting portion 134 cannot enter the workpiece. In the slit that is cut, the arrangement prevents the connecting portion 134 from entering the slit of the cutting, thereby preventing the connecting portion 134 from being applied by the curved surface to the pressure in the direction of the swinging plane to damage the saw blade 130, and also reminding the user. It is necessary to adjust the angle so that the protruding portion of the connecting portion 134 no longer contacts the surface of the workpiece, thereby achieving a safer and smoother cutting process.

Referring to Figure 21, a saw blade 140 of the portable cutter provided for the third embodiment. The saw blade 140 includes a connecting portion 144 having a mounting hole 142, and a base portion 148 extending from the second side wall 146b of the connecting portion 144 to the connecting portion 144.

The function and structure of the saw blade 140 are substantially the same as those of the saw blade 20 provided by the first embodiment, except that an arc is formed between the first side wall 146a of the connecting portion 144 and the end wall of the connecting portion 144 away from the mounting hole 150. Face transition. With this arrangement, the quality of the saw blade 140 can be reduced, so that during the cutting of the workpiece, the vibration of the saw blade 140 is small, the cutting is more precise, and it is not easily damaged by vibration itself.

Referring to Figure 22, a saw blade 152 of the portable cutter provided for the fourth embodiment. The saw blade 152 includes a connecting portion 156 having a mounting hole 154, and a base portion 160 extending from the second side wall 158b of the connecting portion 156.

The saw blade 152 has substantially the same functional structure as the saw blade 20 provided by the first embodiment, and the difference is that the cutting portion of the base portion 160 is a serration portion 162, and the tooth tips of the serration portion 162 are arranged along a circular arc, thereby forming A curved cutting line, this setting can effectively improve the cutting efficiency. Preferably, the center of the circular arc-shaped cutting line coincides with the center of the mounting hole 154, and the arrangement is effective to reduce the vibration generated when the saw blade 152 cuts the workpiece. The side wall of the base portion 160 facing away from the serration portion 162 extends along a straight line, which can effectively reduce the space occupied by the base portion 160, thereby making the saw blade 152 more flexible when cutting the curved surface in the workpiece. The base portion 160 extends beyond the connecting portion 156 to extend a certain length, thereby forming an extending direction of the base portion 160, and sequentially selecting a point of the circular arc-shaped cutting line along the extending direction of the base portion, the point being connected to the center of the mounting hole There is an intersection between the line and the side of the base 160 facing away from the serration 162. The length of the line is different from the distance from the center of the mounting hole to the intersection, and the difference h is sequentially decreased. In the present embodiment, the maximum value of the difference h is 20 mm, and the saw blade 152 cuts the workpiece to achieve a better cutting effect.

Of course, if the two free ends of the circular arc-shaped cutting line are connected to their own center to form a sector, when the center of the mounting hole 154 is outside the sector, that is, the center of the mounting hole 154 and the center of the curved cutting line In this case, the maximum value of the difference h can be set smaller, such as less than 20 mm, and the specific value depends on the specific design. This arrangement can effectively reduce the width of the base 160, making it easier to cut the surface.

Due to factors such as structural arrangement and size, there may be an intersection of not all of the wires with the base 160 facing away from the sidewall of the serration 162, but if there is a portion of the intersection that satisfies the above description, it should be covered. Within the scope of the invention.

Referring to FIG. 23, in order to further improve the cutting efficiency, the serrations of the serrations 162 may extend obliquely with respect to the base 160 and extend in a direction toward the first side 164 of the connecting portion 156, ie, the serrations are opposite to the direction in which the base 160 extends. The direction extends. If the portable cutting machine is installed with the bottom plate described in the foregoing embodiment, the zigzag orientation is set, and the positional relationship between the bottom plate and the workpiece can be tightened during the cutting process, so that the two are more closely matched, thereby reducing the cutting process. The vibration in the middle.

Referring to Fig. 22, in order to increase the effective cutting length when the saw blade 152 is not used for cutting the curved surface, the end surface of the connecting portion 156 away from the mounting hole 154 is provided with serrations which are arranged along the same circular arc line as the serrations of the serration portion 162.

Referring to FIG. 24 and FIG. 25, a portable cutting machine 166 according to a fifth embodiment of the present invention includes a housing 168, a motor (not shown), a transmission mechanism (not shown), and a swing output shaft. 170. Support assembly 172, fasteners 174, and saw blade 176.

The housing 168 includes a body housing 178 and a head housing 180, and the body housing 178 is coupled to the head housing 180 by screws.

The motor is disposed within the body casing 178 and is rotated by the motor shaft output. The transmission mechanism is located in the body casing 178 and the head casing 180, which converts the rotation of the motor output into an oscillating motion, and drives the oscillating output shaft 170 to swing the output. The swing output shaft 170 is received in the head casing 180, and has one end in a polyhedral shape and protrudes from the head shell 180. The end center region is provided with a threaded hole along the axial direction of the swing output shaft 170. The threaded bore is for threaded connection with the fastener 174. In order to make the connection between the fastener 174 and the swing output shaft 170 more stable, a pad 175 is sleeved over the fastener 174.

Support assembly 172 includes a connector 182 and a bottom plate 1 84. When the support assembly 172 is assembled to the portable cutter 166, the connector 182 will be sandwiched between the saw blade 176 and the head housing 180, such that the attachment member 182 can be effectively prevented from falling off the head housing 180, and the bottom plate 184 is sawed. Sheet 176 cuts the workpiece to provide support.

Please refer to Figure 25 and Figure 26 together. The connector 1 82 is made of a flexible material having a first housing 186 and a second housing 1 88, and a circular hole 190 formed between the first housing and the second housing. It can be placed outside of the head casing 180 and used to secure the positional relationship between the support assembly 172 and the portable cutter 166. In the present embodiment, the connector 182 is a plastic article.

The connector 182 is made of a flexible material in order to enable it to be more tightly fitted to the head casing 1 80. When the connector 182 is sleeved to the head casing 1 80, the tolerance of the dimensions can be overcome by the elastic deformation of the flexible material, so that the connector 182 is tightly fitted to the head casing 180. The flexible material may also be rubber, metal with good flexibility, etc., which is not described herein for the sake of the disclosure - but according to the disclosure of the present invention, as long as the functions and effects thereof are the same or similar to the flexible material. All should be covered by the scope of the present invention.

The first housing 186 and the second housing 188 are shaped with the head housing 10 of the portable cutter 166, that is, when the support assembly 172 is assembled to the portable cutter 166, it is coupled to the portable cutter by the connector 182 On the head shell, at this time, the connecting member 1 82 is located between the saw blade 176 and the head shell 180, and the swing output shaft 170 extends from the circular hole 190 to drive the saw blade 176 to work. An annular reed 192 is disposed on the side wall of the opening of the circular hole 190 to prevent the saw blade 176 from directly contacting the hole wall of the circular hole 190 during operation to wear the hole wall, thereby protecting the connector 182. effect.

In order to better define the position of the connector 182, the frictional resistance between the connector 182 and the housing 168 may be increased, such as in the first housing 186 and/or the second housing 188 facing the portable cutting machine. The surface of the 166 is provided with a non-slip layer, such as a rubber coating, or a rubber band. Of course, those skilled in the art can also define the positional relationship between the connector 182 and the portable cutter 166 by other means, but the same or similar functions as the present invention are included in the scope of the present invention.

Screw holes 193 are provided at positions of the first housing 186 and the second housing 1 88 around the circular hole 190, respectively, for fixed connection with the base plate 1 84. Of course, the position and number of the screw holes 193 are not limited to the above description, and may be set at other positions according to the structural arrangement, and the number may also be set to three, four, etc., as long as the connector 1 82 and the bottom plate can be firmly fixed. The positional relationship between 1 and 84 is sufficient.

The support assembly 172 can be mounted to the portable cutter 166 very conveniently by the connector 1 82. That is, the connector 1 82 is sleeved to the outside of the head casing 180 of the portable cutter 166. When the disassembly is required, the fastener 174 is first removed, and the connector 182 can be cut together with the saw blade 176. The machine 166 is removed, which brings great convenience to the user.

Please refer to Figure 25 and Figure 27 together. The bottom plate 1 84 includes a mating piece 194, an abutment plate 196, and a guide assembly 198.

The mating member 194 is disposed on the abutting plate 196 and protrudes from the surface of the plate 196, and is formed integrally with the abutting plate 196, so that the overall strength of the bottom plate 184 is better. A through hole 200 is provided at the center of the fitting member 194. When the support assembly 172 is assembled to the portable cutter 166, the axis of the through hole 200 coincides with the axis of the swing output shaft 170. When the user disassembles the saw blade 176, the mounting hole 52 of the saw blade 176 can be seen through the through hole 200. Attached to the swing output shaft 170, the fastener 174 can be mounted or removed through the through hole 200. Thus, when the user disassembles or installs the saw blade 176, the user does not need to disassemble the support member 172, which is convenient for the user.

A bottom plate screw hole 202 is provided in a region of the fitting member 194 surrounding the through hole 200. The number and position of the bottom plate screw holes 202 correspond to the number and position of the screw holes 192 of the connecting member 182. In the present embodiment, the number of the bottom plate screw holes 202 is two, and the positions thereof are respectively connected with the connecting member 182. The positions of the two screw holes 192 correspond. When the abutment plate 196 is mounted to the connector 1 82, the positional relationship is locked by the two screws 204.

The abutting plate 196 has a substantially flat shape, and the surface facing away from the mating member 194 is an abutting surface for abutting against the surface of the workpiece when the portable cutting machine 166 cuts the workpiece, so that the cutting operation is more stable and capable of Reduce vibration during cutting to prevent damage to the saw blade 176 due to vibration. The abutment surface is substantially rectangular and has a pair of long sides and a pair of short sides. When the support assembly 172 is assembled to the portable cutter 166, an axis extension of the swing output shaft 170 is on the abutment surface. A projection of the extended plane is perpendicular to the long side line and parallel to the short side line. The distance between the short edge of the two swinging output shafts and the swing output shaft 170 on the abutting surface is X; the axis of the swing output shaft 170 and the saw teeth of the saw blade 176 are The projection distance of the abutment surface is Y, because the number of the serrations may be plural, so the projection distance Υ is the maximum projection distance of the axis and the serration on the abutment surface; in the embodiment, the projection The distance ≥ projection distance Υ is such that the saw blade 176 can be more stably and reliably supported when the workpiece is cut. Preferably, the projection distance Χ ≥ 40 mm, such setting can further improve the stability of the cutting.

A slot 204 extending along the longitudinal direction of the abutment plate 196 is provided at an end of the abutment plate 196 away from the mating member 194 for receiving the saw blade 176 when the portable cutter 166 cuts the workpiece, so that the saw blade The 176 is capable of cutting the workpiece through the slot 204.

In order to enhance the stress strength against the plate 196, a plurality of ribs may be provided on the surface of the abutment plate 196 where the fitting 194 is disposed.

The guide assembly 198 includes a fixed plate 206 and two rollers 208.

The fixing plate 206 has a square flat plate shape, and is fixed to the bottom plate 1 84 by screws to a position where the slit 204 is provided. The fixing plate 206 has a fixing plate slot 210 corresponding to the slot 204 and extending in the same direction, and has the same functional effect as the slot 204. A roller 208 is disposed at a position adjacent to the notch of the fixing plate slot 210, respectively. When the portable cutter 166 cuts the workpiece, the saw blade 176 is held between the two rollers 208, and when the curved surface is cut, the saw blade 176 will abut against one of the rollers 208, at which point the roller 208 will rotate. It does not hinder the oscillating motion of the saw blade 176. In this way, the saw blade 176 can be prevented from shifting during the cutting of the curved surface, thereby greatly improving the overall cutting precision, and at the same time reducing the saw blade 176 due to vibration. The risk of severe rupture.

The abutment surface of the abutment plate 196 is not limited to a rectangle, but may be formed into other shapes such as a circle, a triangle, other polygons, and the like. Correspondingly, the shapes of the abutting plate 196, the mating member 194 and the guiding member 198 are also changed correspondingly, as long as the technical essence thereof is the same as the present invention or the modifications thereof belong to the common knowledge of those skilled in the art, and should be covered by the present invention. Within the scope of protection.

Referring to Figures 28 to 30 together, a support assembly 212 for a portable cutter according to a sixth embodiment of the present invention is shown. Support assembly 212 includes a connector 214 and a bottom plate 216.

The support assembly 212 is substantially identical in function to the support assembly 172 provided by the fifth embodiment, except that: the bottom plate 216 includes a mounting plate 21 connected to the connector 214, and an abutment plate 220 assembled on the connector. And a guide assembly 222 mounted on the abutment plate 220.

The mounting plate 218 is made of a plastic material having a rectangular parallelepiped shape and having an upper surface 224a and a lower surface 224b. The upper surface 224a is connected to the connecting member 214 at one end in the longitudinal direction of the mounting plate 218. In the present embodiment, the mounting plate 218 and the connecting member 214 are formed in a unitary structure. A plurality of screw holes are provided on the upper surface 224a for fixing the positional relationship with the abutting plate 220 by screws. The upper surface 224a is provided with a slot 226 at one end of the mounting plate 218 longitudinally away from the connector 214, and the slot 226 extends along the longitudinal direction. The slot 226 has a notch 226a, and the side walls of the notch 226a form a recess to reserve a space for the guide assembly 222. When the mounting plate 218 is assembled with the abutting plate 220, the lower surface 224b is mated with the abutting plate 220.

The abutting plate 220 is made of a metal material having a rectangular parallelepiped shape and having an abutting surface 220a for abutting against the workpiece. The surface 220b of the abutting plate 220 facing away from the abutting surface 220a is used for the following table with the mounting plate 218 Face 224b is mated. The surface 220b is provided with a screw hole corresponding to the screw hole of the mounting plate 218, so that the positional relationship between the abutting plate 220 and the mounting plate 218 can be fixed by screws. In the present embodiment, the abutting plate 220 is made of a stainless steel plate so that the abutting plate 220 has excellent wear resistance.

The abutting plate 220 is provided with abutting plate slot 228 corresponding to the slot 226 of the mounting plate 21 8 , and the slot 226 and the abutting plate slot 228 extend through the bottom plate 216 to enable the saw blade of the portable cutting machine to pass through the slot Cutting the workpiece.

Some measures may be taken to make the positional relationship between the mounting plate 218 and the abutting plate 220 more stable, and to prevent the wear of the mounting plate 218 from occurring. In the present embodiment, the edge of the surface 220b of the abutting plate 220 is provided with The flange is bent toward the mounting plate 218 to effectively protect the mounting plate 21 8 and to further limit the position.

The guiding assembly 222 is disposed at a notch of the plate slot 228. When the abutting plate 220 is assembled with the mounting plate 21 8 , the guiding assembly 222 extends from the notch 226 a of the slot 226 to the mounting plate 21 8 . Upper surface 224a. The specific functional structure of the guiding member 222 is substantially the same as that of the guiding member 198 of the fifth embodiment, and is not limited herein.

In the present embodiment, the structure of the support assembly 212 is simple, the overall structure is more compact, and the overall stress strength is greatly improved, so that the support is more stable and reliable.

Referring to Figures 31 and 32, a support assembly 230 for a portable cutter according to a seventh embodiment of the present invention is shown.

The support assembly 230 has substantially the same functional structure as the support assembly 212 provided by the sixth embodiment, except that: the abutting plate 232 of the bottom plate 230 faces the side of the workpiece, and has a first plane 232a and a second plane 232c, wherein The second plane 232c is for abutting against the workpiece, and the planes of extension of the first plane 232a and the second plane 232c intersect such that the abutment 233 is slotted and the portion of the guide assembly 234 is mounted away from the first plane 232a Lift up. Such an arrangement can effectively reduce the influence of the vibration on the cutting, that is, the saw blade will pass through the slot and then cut the workpiece, so the position where the saw blade contacts the workpiece is most severely shaken. In the present embodiment, the abutting plate 232 is only The first plane 232a abuts against the workpiece, and the second plane 232c is tilted away from the workpiece, so that the abutting plate 232 does not come into contact with the most vibrating area, thereby reducing the vibration of the bottom plate 230, thereby reducing The vibration transmitted from the bottom plate 230 to the portable cutting machine greatly enhances the user's comfort in use.

The support assembly and the saw blade described in the foregoing various embodiments can be separately used as a set of accessory products. Since the bottom plate is mounted on the portable cutting machine by means of socketing, there is no need to improve the casing of the portable cutting machine. Wide applicability brings convenience to users. Of course, with The saw blade used in conjunction with the bottom plate is not limited to the structure described above, and other saw blades, such as a circular saw blade, a straight saw blade, etc., may be used, which are not performed here - as long as the bottom plate is provided according to actual needs. It can be used with simple modifications.

Further, the support assembly in the fifth embodiment to the seventh embodiment may also adopt a structure in which the support assembly has an adjustable position of the bottom plate in the first embodiment, whereby the support assembly and the saw described in the foregoing various embodiments When the sheet is used as an accessory product alone, the support assembly can be adapted to a wider variety of saw blades by adjusting the position of the bottom plate of the support assembly.

It will be appreciated by those skilled in the art that the specific structure of the portable cutting machine of the present invention may have many variations, but the main technical features of the technical solution are the same as or similar to the present invention, and should be covered by the scope of the present invention. Inside.

Referring to FIG. 33 and FIG. 34, a portable cutting machine 235 according to an eighth embodiment of the present invention is provided. The portable cutting machine 235 of the present embodiment is an oscillating machine, and includes a housing 248 disposed substantially in an angular direction. The motor 236 is disposed inside, the motor 236 has a motor shaft 240, and the motor bearing 182 supports the motor shaft 240. The bearing 182 can use a common ball bearing, and is preferably used to provide a very high speed while being small and resistant. High-temperature bearings, such as air-floating bearings, hydraulic bearings, etc. These bearings use gas or liquid as lubricants, have low resistance, allow higher rotational speeds, and maintain low vibration levels; small resistance and small friction, power loss And the generated heat is small, so the temperature rise is small. Of course, not only motor shaft bearings but also air bearing bearings, hydraulic bearings, and other bearings can also be used with air bearing bearings and hydraulic bearings. A swing output shaft 262 extending from a front end of the housing 248 (the right side is defined as a front end in the drawing), and the swing output shaft 262 is fixedly coupled to the housing 248 via upper and lower bearings 250, 264 provided inside the housing 248 The swinging output shaft 262 is also fixedly connected with a shifting fork 238. The shifting fork 238 has two oppositely extending extending arms 252, 254 between the two extending arms 252, 254 and closely fitting the extending arm 252, The 254 is provided with an eccentric 266. The eccentric 266 is sleeved on the eccentric pin 260 connected to the motor shaft 240 of the motor 236, and the eccentric 266 is eccentrically disposed with respect to the motor shaft 240. When the motor 236 is driven, the motor shaft is 240 will drive the eccentric 266 to rotate eccentrically with respect to the motor shaft 240, and because the shift fork 238 is in close contact with the eccentric 266, the shift fork 238 will drive the oscillating output shaft 262 around itself under the driving of the eccentric 266. The axis X is oscillated and the direction of motion is shown by the double arrow in Figure 1.

At this time, if a different attachment working head 256 is attached to the free end of the swing output shaft 262, such as a straight saw blade, a circular saw blade or a triangular sanding disc, etc., cutting, grinding, and the like can be performed.

The swing frequency of the swing output shaft 262 of the embodiment is greater than or equal to 20,000 times/min, preferably, the swing The swing frequency of the output shaft 262 is between 20,000 beats/min to 45,000 beats/min. More preferably, the swinging output shaft 262 has a swing frequency of between 30,000 beats/min to 35,000 beats/min. For example, in the embodiment, the swing frequency of the swing output shaft 262 is 32000 beats/min, and the swing frequency of the swing output shaft 262 is greatly improved. When the swing output shaft 262 is connected to the cutting work head such as a circular saw blade, the saw blade swing frequency is 32000. Sub/min, because the saw blade is inevitably left with a knife mark on the workpiece. When the saw blade is swung more frequently, the interval between adjacent cuts can be shortened, so that the saw blade is The distance between the knife marks left on the surface of the workpiece will be greatly shortened, which will greatly improve the surface cutting precision of the workpiece. In addition, the sawing speed of the saw blade will increase, which will speed up the linear speed of the saw blade, thus accelerating the saw blade on the workpiece. Feed rate, which greatly improves cutting efficiency. On the basis of the increase of the feeding speed and cutting precision of the saw blade, the user can push the portable cutting machine to feed on the workpiece more easily and is more convenient to use. When the oscillating output shaft 262 is connected to the polishing type working head, such as a triangular sanding disc, when the oscillating frequency of the sanding disc is 32000 times/min, when the grinding amount per unit time is constant, the polishing precision is greatly improved. The grinding frequency of the sanding disc is increased, which also speeds up the polishing efficiency. When the swing output shaft 262 is connected to other working heads, the work efficiency and the work quality can also be improved.

After the swing frequency of the working head is increased, if the mass of the working head is large, the high-frequency swing may cause damage to the swing output shaft 262. To avoid such a hazard, the mass of the working head of the embodiment is less than or equal to 20 g, to reduce The quality of the working head can be made of lightweight materials, such as a saw blade body made of titanium alloy, and an opening can be provided on the working head to reduce the quality of the working head.

The swinging output shaft 262 swings at a higher frequency, and the motor 236 is required to operate at a high speed. The temperature of the motor 236 will rise, which will affect the life of the motor 236. When the temperature of the motor 236 rises, the temperature of the housing 248 will also rise, which may be hot. To solve this problem, the present embodiment provides a circulating cooling device 268, such as a circulating water cooling device, on the inner surface of the casing 248, the circulating water cooling device including a plurality of pipes disposed on the casing, the water being in the pipe The circulation is continuously circulated, heat is exchanged with the casing to lower the temperature of the casing, and a sealable water injection port is arranged outside the casing 248. After the water is used for a period of time, the temperature rises, and the water can be exchanged through the water injection port, of course, cooling The media can also use any other medium that is larger than the heat. The housing 248 is preferably made of a material having good heat dissipation properties, such as aluminum or magnesium alloy. To further reduce the temperature of the housing 248, a plurality of concave and convex portions 242 may be disposed on the surface of the housing 248 to increase the heat dissipation area of the housing. In the embodiment, the uneven portion is in the form of a fin, and other forms of the uneven portion can also perform the function. Preferably, the circulating cooling device and/or the concavo-convex portion may be disposed at a portion of the housing 248 that houses the motor and the transmission mechanism, but is not limited thereto, such as a component having a relatively high temperature during operation of the portable cutter 235, such as the motor shaft bearing 272. The support and the like can cause the circulating cooling device to cool it. Of course, the circulating cooling device and the concave surface The convex part can be used alone. In this embodiment, the portable cutting machine can be cooled in other ways, such as installing more than two fan-to-case components in the housing, such as cooling the motor, and installing a fan on the outer surface of the housing to cool the outer surface of the housing and the working head. These fans can be driven directly by the motor or by a separate motor zone.

In order to move the working head at an approximately constant swing frequency, the portable cutting machine 235 of the present embodiment is provided with a controller that monitors the operating voltage and load current of the motor 236, and calculates the motor 236 according to the load current of the motor 236. The target voltage required for the preset speed is adjusted to the target voltage of the motor 236, so that the motor 236 is constantly rotated at the preset speed to obtain stable performance.

The working head 256 is oscillated at a high frequency, and the temperature will rise during the working process, which will affect the life of the working head. In order to reduce the high temperature during the working of the working head, the working head cooling device 258 is disposed on the casing 248 in this embodiment. Specifically, the head cooling device 258 includes a conduit 270, a spray head 244, and a coolant tank 246 from which the cooling medium is sprayed from the coolant tank 246 through the conduit 270 and the spray head 244 to the working head 256 to cool the working head. The cooling medium is preferably a gas, and the cooling gas is sprayed to the working head without obstructing the working position of the working head, and the debris is blown off the workpiece. When the gas is used as the cooling medium, the cooling liquid tank can be compressed. gas. A liquid can also be used for the cooling medium. When the coolant is used, it is preferably a non-conductive material, so that it does not cause leakage and is dangerous. Of course, the simplest water can be used as the coolant when sealing the live parts. In the case of the coolant, since the coolant may block the working position of the working head, it is preferable to provide other guiding means such as laser guiding or the like in a place where the front side of the working head 256 is not sprayed by the coolant. There are also alternatives to this embodiment. For example, when a gas-cooled saw blade is used, the saw blade can be cooled by blowing a blower using a blower or a fan instead of the compressed gas stored in the coolant tank 246.

The swinging frequency of the working head of the portable cutting machine is much higher than that of the conventional swinging portable cutting machine on the market. This can be achieved in various ways, such as selecting a high output speed motor, such as by changing the motor shaft and the output shaft. The reduction ratio between the two reaches the required swing frequency of the working head. In summary, the ideal head swing frequency can be achieved by simply selecting the motor and/or properly configuring the reduction ratio.

For a long time, those skilled in the art believe that the increase of the swinging frequency of the working head of the portable cutting machine brings some unsolvable problems, such as the influence of high temperature on the life of the machine, etc. In this embodiment, the portable cutting machine 235 is cooled in various ways. At the same time, some other measures are taken to cope with some other problems that may be caused by the increase of the swing frequency. When obtaining the high work quality and high work efficiency brought by the increase of the swing frequency of the working head, some possible problems are avoided, and the swing frequency is greater than or equal to 20000 times / min A portable cutting machine was implemented.

It will be understood that the work of the head and the body cooling described in the present embodiment, and the scheme of setting the controller to achieve the steady speed can also be applied to any of the portable cutters of the first to seventh embodiments.

In this embodiment, a multi-function oscillating machine is taken as an example, and other oscillating power tools, such as a sanding machine, an angle grinder, and the like, can be used in the swing type portable cutting machine, thereby achieving the purpose of improving work quality and efficiency. . Any technical solution using equivalent transformation or equivalent replacement is within the scope of the present invention.

Claims

Claim

A portable cutting machine comprising:

Housing

a oscillating output shaft partially extending from the housing, having an output shaft axis;

a motor housed in the housing;

a drive shaft that is driven by the motor, the drive shaft has a drive shaft axis; a motion conversion mechanism that converts the rotation of the drive shaft into a swing of the swing output shaft; wherein: the output shaft axis Arranged parallel to the axis of the drive shaft.

2. The portable cutting machine according to claim 1, wherein: the motion conversion mechanism includes an eccentric member mounted on the drive shaft, and is coupled to the eccentric member and fixedly mounted to the swing output shaft In the upper fork, the eccentric has a center line disposed eccentrically with respect to the axis of the drive shaft, and the center line is disposed in parallel with the axis of the output shaft.

3. The portable cutting machine according to claim 1, wherein: the swinging output shaft has a swing frequency greater than 30,000 beats/min.

4. The portable cutting machine according to claim 1, wherein: the housing includes a motor housing portion that houses the motor, and a grip portion for gripping, the grip portion and the receiving portion The phase separation setting.

The portable cutting machine according to claim 4, wherein: the grip portion extends longitudinally to form a longitudinal extension direction of the grip portion, and the grip portion has a longitudinal extension direction and the drive shaft axis Vertical setting.

6. The portable cutting machine according to claim 5, wherein: the output shaft axis is perpendicular to the longitudinal extension direction of the grip portion.

The portable cutting machine according to claim 5, wherein the housing is further provided with a battery pack accommodating portion that extends in the same direction as the grip portion.