TWI749677B - Power tools with front and rear ventilation structure - Google Patents

Abstract

The present invention relates to an electric tool with a front and rear venting structure, comprising: a housing, the rear end of which is provided with an accommodating space, the front and rear ends of the accommodating space are formed with a longitudinal direction; the housing is also provided with at least one rear vent and At least one front vent communicates with the accommodating space; a circuit unit, an electric motor, and a fan are arranged along the longitudinal direction of the accommodating space, the electric motor can drive the fan and a transmission device to rotate, the front vent It is also arranged on the peripheral side of the transmission device, and when the electric motor drives the fan to flow air, the air can flow from each of the rear vents to the front vents, and the accommodation space and the transmission device are well produced. Comprehensive heat dissipation.

Description

Power tools with front and rear ventilation structure

The invention relates to an electric tool, and particularly refers to an electric tool with a front and rear ventilation structure that can be provided with vents for the front and rear devices of the electric tool.

Fig. 1 shows a conventional electric tool 10, which has a housing 11 and a handle 12. An electric motor 13 and a fan 14 are arranged in the housing 11; a circuit unit 15 including a circuit board is mounted on the handle 12 in. When the electric tool 10 is started, the operation of the electric motor 13 and the fan 14 is controlled through the circuit unit 15. When the fan 14 rotates, air can flow into the housing from the air inlet 16 of the housing 11, and then be discharged from the air outlet 17, and the electric tool 10 can dissipate heat through the effect of air flow. The electric motor 13 The front end also drives a transmission device 18 through which the workpiece can be screwed or loosened.

When the electric tool 10 is operated, the electric motor 13 and the electronic components in the circuit unit 15 both generate heat, which causes the electric tool 10 to generate heat. Therefore, the electric tool 10 has a heat dissipation design to discharge hot air.

However, in the above-mentioned prior art, due to design constraints, the electric motor 13 and the circuit unit 15 are arranged on different lines, so that the circuit unit 15 is arranged in the handle 12 and is not located in the heat dissipation path. The fan 14 and the air inlet 16 and the air outlet 17 can only dissipate heat to the electric motor 13, and cannot remove the heat generated by the circuit unit 15. In addition, the internal space of the electric tool is narrow and the heat cannot be removed, causing the circuit unit 15 to accumulate too much The heat can easily cause crashes or poor operating efficiency, and will reduce the service life of the power tool. In addition, the air inlet 16 and the air outlet 17 are only arranged on one side of the electric motor 13, so the air During the flow, the electric motor 13 is only partially exposed to the action of air flow to generate heat, and the effect of using air to conduct heat is not good, and it cannot produce comprehensive heat dissipation;

What’s more noteworthy is that there are gears or impact devices inside the transmission device 18. During operation, due to friction or work between parts, it will be converted into heat, causing the transmission device 18 to be in an operating position. High heat will be generated during the process, but the transmission device 18 is often not provided with any heat dissipation mechanism. As a result, in use, the heat at the position of the transmission device 18 will be higher than that between the electric motor 13 or the circuit unit 15 due to electricity generation. The heat energy is higher, so that the parts are easily heated to cause fatigue or strength changes, and are easily damaged.

The main purpose of the present invention is to provide an electric tool with a longitudinal heat dissipation path, which can form a better front and rear heat dissipation effect.

Another object of the present invention is to provide an electric tool with better heat dissipation effect, which can provide a comprehensive heat dissipation for the circuit unit, electric motor and transmission device of the electric tool, and improve the service life of the electric tool.

Another object of the present invention is to provide an electric tool whose components are arranged in a straight line from the front to the back to facilitate heat dissipation.

To achieve the above objective, the present invention provides an electric tool with a front and rear ventilation structure, which includes: A housing, the rear end of which is provided with an accommodating space, the front and rear ends of the accommodating space are formed with a longitudinal direction; the housing is also provided with at least one rear vent and at least one front vent, the rear vent and the front vent The mouth system is connected with the accommodating space; A transmission assembly is arranged at the front end of the housing. It has a transmission device and an actuator. The actuator is driven by the transmission device and is arranged at the front end of the transmission assembly. Each of the front vents is arranged at The peripheral side of the transmission device; A circuit unit, an electric motor and a fan are arranged along the longitudinal direction of the containing space, and the electric motor can drive the fan and the transmission device to rotate.

In the electric tool with front and rear ventilation structure provided by the present invention, the circuit unit and the electric motor are arranged in the accommodating space. When the electric motor drives the fan, air flows between the rear vents and the front vents. Flow, and will flow through the accommodating space and the peripheral side of the transmission device, so that a comprehensive air flow can be generated inside the accommodating space and outside the transmission device, so that the electric motor, the circuit unit and the transmission device can be received Good and comprehensive heat dissipation; and the circuit unit is arranged in the accommodating space, so that the circuit unit can have a larger area, and can install more components and form a larger heat dissipation area; the transmission device The generated heat energy can also be well dissipated, reducing the overall working temperature.

Please refer to FIGS. 2 to 5, which are the electric tool 20 provided by the first preferred embodiment of the present invention, including:

A housing, which is composed of a front housing 80 and a rear housing 30. In this embodiment, the front housing 80 has a front and rear two-stage assembly module, and the rear housing 30 has upper and lower The design of the two-stage assembly module can be changed according to the processing method, component layout and other requirements, and does not limit the number of modules and assembly location.

An accommodating space 31 is formed inside the rear housing 30. The rear housing 30 has a longitudinal direction C. The front and rear ends of the rear housing 30 and the front and rear ends of the accommodating space 31 are located in the longitudinal direction C. The rear side of the accommodating space 31 is formed as a large-diameter section 311, and the front side is relatively formed with a small-diameter section 312. The cross-sectional area of the large-diameter section 311 is larger than the small-diameter section 312; A number of rear vents 32 are provided to communicate with the accommodating space 31. The rear vents 32 are provided around the rear end of the rear housing 30 and communicate with the large-diameter section 311. The layout position and the size and shape of the opening can be designed to achieve a better fluid flow effect. The layout position and the size and shape of the opening are not limited to those shown in the drawings; please refer to Figure 6, the rear end of the rear housing 30 A set of connecting portions 34 are respectively provided on the left and right sides near the position of the rear vent 32. Each set of connecting portions 34 is provided with two screw holes 341 and an auxiliary rear vent 342. The auxiliary rear vent 342 communicates with the accommodating space 31 , The circumference of the two screw holes 341 is provided with a reinforcing rib 343 protruding, the reinforcing rib 343 forms an outwardly radiating configuration along the periphery of the two screw holes 341, and a ring is provided on the outermost side, the reinforcing rib The configuration of 343 can also be changed according to the design, and the configuration is not limited; and, the front end of the rear housing 30 is provided with a connecting portion 35, and the outer circumference of the connecting portion 35 is provided with a connecting vent 351 and the housing The space 31 is connected. The arrangement position and opening size and shape of the connecting vent 351 can be designed to achieve a better fluid flow effect. The arrangement position and opening size and shape are not limited to those shown in the drawings. The rear end of the rear housing 30 is provided with a joint 36, which is provided with a joint vent 361, and the joint vent 361 communicates with the accommodating space 31.

A transmission assembly 40 is arranged at the front end of the housing, that is, the front end of the rear housing 30. Please refer to FIGS. 9 and 10 again. The front housing 80 is sleeved on the outside of the transmission assembly 40. The transmission The assembly 40 is provided with a transmission device 46 and an actuator 41 in the front housing 80. The actuator 41 is provided at the front end of the transmission assembly 40 and protrudes out of the front housing 80. The drive of the device 46. In this embodiment, the transmission device 46 can be a reduction gear set and drive the actuating member 41. This part is a conventional actuating structure, and will not be repeated here; the front housing 80 is connected to the upper and lower two The sides are respectively formed with a socket part 81; please refer to Figure 11, a front handle 43 can be assembled on the upper socket part 81 or the lower socket part 81 as required to facilitate the use of different dominant hands For use and replacement, a heat-insulating gasket 83 is provided between both ends of the front handle 43 and the front housing 80, so that the front handle 43 can block the heat from the front housing 80; please refer to the figure for cooperation. As shown in 9, the front housing 80 is provided with a number of front vents 82 at the rear end. The front vents 82 penetrate the surface of the front housing 80 and are located on the periphery of the transmission device 46 so that the front vents 82 penetrates the front housing 80. The arrangement positions and opening sizes and shapes of the front vents 82 can be designed to achieve a better fluid flow effect. The arrangement positions and opening sizes and shapes are not shown in the figures. For limitation; the rear end of the front housing 80 is assembled to the front end of the connecting portion 35 of the rear housing 30, and the front housing 80 is recessed with a number of grooves 85 relative to the rear end. The grooves 85 are formed by Tilt back and forth, and an auxiliary front vent 45 is formed between the accommodating space 31 and the front housing 80, so that the outer side of the groove 85 of the front housing 80 can pass through the auxiliary front vents 45 and the front housing 80 The accommodating space 31 is connected; in addition, in order to increase the heat dissipation area of the front housing 80, the front end of the front housing 80 is provided with a heat dissipation portion 84. The heat dissipation portion 84 may have a fin configuration or a concave-convex surface The configuration is used to increase the heat dissipation area of the surface, and the heat dissipation part 84 can be arranged adjacent to the front vent 82, so that the airflow of the front vent 82 and the auxiliary front vent 45 can flow to the heat dissipation part Around 84, the heat dissipation portion 84 is allowed to circulate air to enhance the heat dissipation effect.

A drive assembly 50, please refer to Figures 4 and 12, includes a circuit unit 51, an electric motor 52 and a fan 53, the drive assembly 50 is arranged along the longitudinal direction C of the accommodating space 31 in the rear ventilation In front of the port 32, the electric motor 52 can drive the fan 53 and the transmission 46 of the transmission assembly 40 to rotate; the arrangement sequence of the drive assembly 50, please refer to FIG. 4, which is located in the accommodating space 31 The rear end is the circuit unit 51, which is located closest to the rear vents 32, the front end of the circuit unit 51 is provided with a heat dissipation fin 511 to assist in heat dissipation, and then the front of the circuit unit 51 is an electric motor 52 and a fan 53 in sequence; The fan 53 is located closest to the front housings 80; when the fan 53 rotates, it will generate a negative pressure on the accommodating space 31, so that air will flow from the rear end of the accommodating space 31 to the front end. The air enters through the rear vents 32, the auxiliary rear vents 342, and the joint vent 361, and flows through the circuit unit 51 and the electric motor 52 of the drive assembly 50, and then passes through the connecting vent 351 and the auxiliary front The vent 45 is discharged to the position of the front vent 82 and can dissipate heat to the peripheral side of the transmission assembly 40.

A handle 60, please refer to Figures 5 and 6, has two arms 61 and a holding portion 62. The two arms 61 protrude from both ends of the holding portion 62, between the two arms 61 and the holding portion 62 A space 63 is formed, and the handle 60 is connected to the rear end of the rear housing 30; the ends of the two arms 61 are respectively formed with a mating portion 611 opposite to each other, and the mating portion 611 is bolted to the assembly portion 34 On the screw hole 341, please refer to FIG. 8. There is a gap between the mating portion 611 and the auxiliary rear vent 342, so that the air outside the housing 30 can flow into the housing through the auxiliary rear vent 342 In the space 31; and, the reinforcing rib 343 around the screw hole 341 can provide a function of reducing stress concentration, so that the handle 60 is not easy to fall off from the rear housing 30, and the service life is increased.

A battery unit 70, please refer to FIG. 7, detachably mounted on the joint 36 at the rear end of the rear housing 30, and located in the space 63 formed by the two arms 61 of the handle 60 and the grip 62 , The battery unit 70 is electrically connected to the drive assembly 50 to provide power to the drive assembly 50, and can be protected by the handle 60 to avoid being separated from the rear housing 30 due to the influence of foreign objects or external forces; The rear side of the battery unit 70 is provided with a rear battery vent 71. The arrangement position and the opening size and shape of the battery rear vent 71 can be designed to achieve a better fluid flow effect. The arrangement position and the opening size and shape It is not limited to what is shown in the drawings; the front end of the battery unit 70 is provided with a battery front vent 72, when the battery unit 70 is assembled on the joint 36, the battery front vent 72 will be connected to the joint 36 The vents 361 are connected. When the fan 53 rotates to generate negative pressure drawn from back to front, the air will also enter the battery unit 70 through the rear vent 71 of the battery to dissipate heat, and then pass through the front vent 72 of the battery. It is led out, and the air is sucked into the accommodating space 31 through the joint vent 361.

For the electric tool provided by the present invention, please refer to Figures 2, 3 and 12, 13. When the battery unit 70 drives the drive assembly 50 to move, the electric motor 52 will drive the drive assembly 40 and make the drive assembly 40 actuate. When the component 41 is activated, the circuit unit 51 and the electric motor 52 will generate heat when the transmission assembly 40 is activated. When the transmission assembly 40 is activated, the transmission 46 will also generate high heat due to the loss and friction caused by the conversion of work. The fan 53 follows the The electric motor 52 rotates together to form a negative pressure in the accommodating space 31. The air in the accommodating space 31 flows from the rear to the front due to the suction of the negative pressure. The positions of the rear vent 32, the auxiliary rear vent 342, and the joint vent 361 are sucked into the entire accommodating space 31, and after entering the large-diameter section 311 of the accommodating space 31, they flow to the small-diameter section 312 and toward the front end. Connect the vent 351, the auxiliary front vent 45, and the front vent 82 to lead out the air. Because of the difference in the cross-sectional area of the large-diameter section 311 and the small-diameter section 312 in the accommodating space 31, from the large-diameter section 311 to the smaller When the radial section 312 flows in the direction, because the cross-sectional area is reduced, the flow speed will increase and the heat dissipation effect will be increased; in addition, because the drive assembly 50 is arranged in a straight line along the longitudinal direction C of the accommodating space 31, the airflow is from back to front When it flows, it will first flow from the direction of the circuit unit 51 to the direction of the electric motor 52, both of which are located in the direction of the air flow, which can ensure that both can carry out good heat dissipation. In addition, the position of the circuit unit 51 is set at The position of the large-diameter section 311, so there is a larger position where electronic components and heat dissipation fins 511 can be arranged, which can have better functionality and a larger heat dissipation area; at the same time, the front vent 82 can bring airflow into the The transmission device 46 dissipates heat, and the auxiliary front vent 45 can guide the airflow and the airflow formed by the groove 85 outside the front housing 80 can take away the transmission device 46 to the front housing 80. Thermal energy can reduce the thermal energy of the transmission assembly 40. Because the air will flow in the entire accommodating space 31 and flow to the front end, the electric motor 52 and the circuit unit 51 of the drive assembly 50 will be enveloped by the entire circumference of the air. The transmission assembly 40 also has a cooling effect due to air flow. In addition, the heat dissipation portion 84 on the front housing 80 can also increase the heat dissipation area and effectively reduce the transmission area. The temperature on the assembly 40; at the same time, the battery unit 70 will also be affected by the negative pressure generated by the fan 53, so that air can enter from the rear vent 71 of the battery, and the heat in the battery unit 70 is transferred from the battery The front vent 72 is guided into the accommodating space 31, so that the battery unit 70 also has a heat dissipation effect.

Please refer to Figures 14 and 15, which is the second preferred embodiment of the present invention. Its main structure is the same as that of the previous embodiment. The same components use the same reference numerals and will not be repeated here. Among them:

The front end position of the rear housing 30 is provided with a central vent 37. The layout position and opening size and shape of the central vent 37 can be designed to achieve a better fluid flow effect. The layout position and opening size and shape are not Not limited to what is shown in the drawings, the fan 53 of the drive assembly 50 is located at the front end of the rear housing 30, the fan 53 is a centrifugal fan, and the fan 53 is relatively close to the central vent 37, so, When the fan 53 is driven by the motor 52, the front and back sides of the fan 53 will generate negative pressure suction, so that the air can pass through the rear vents 32, auxiliary rear vents 342 and joint vents respectively. 361 enters, and the front vents 82, the connecting vent 351 and the auxiliary front vent 45 at the front enter the front end of the accommodating space 31, and are guided to the centers of the rear housing 30 through the fan 53 The vent 37 is exhausted so that the air can dissipate heat to the motor 52, the circuit unit 51 and the transmission assembly 40, and the heat of the transmission assembly 40 will not be transferred to the motor 52 and the circuit unit 51 Place. In addition, for the flow of guiding air, the fan 53 can also draw air into the accommodating space 31 from the position of the central vent 37, and then make the air in the accommodating space 31 pass from the rear end of the air respectively. The rear vents 32, the auxiliary rear vents 342, and the joint vents 361 are exhausted, and the front vents 82, the connecting vents 351, and the auxiliary front vents 45 are exhausted to promote the heat removal effect of the accommodation space 31. The outer periphery of the front vent 82 may also be formed with a concave-convex surface to increase its heat dissipation surface area and improve the heat dissipation effect.

In the electric tool of the present invention, the drive assembly is arranged in the accommodating space and arranged in a straight line. Cheng Jie can have a good and comprehensive heat dissipation effect. Compared with conventional electric tools, the motor and the circuit unit are not on the same line, and can only dissipate heat in a single location, and cannot dissipate the transmission device, resulting in heat dissipation. The effect is not good. The present invention can produce good heat dissipation for the electric motor, the circuit unit and the transmission assembly through the direct, fast and full-circumferential air guiding and heat dissipation effect.

The above-mentioned embodiments are merely illustrative of the technical means of the present invention rather than limiting. Any equivalent modification of the present invention should be regarded as the protection scope of the present invention. The electric tool of the present invention has the first structure in this field and has the enhancement of practical effects, and an application is filed according to the law.

10: Power tools

11: shell

12: Grip

13: Electric motor

14: Fan

15: circuit unit

16: air inlet

17: Exhaust port

18: Transmission

20: power tools

30: Rear shell

31: accommodating space

311: Large Diameter Section

312: Trail section

32: Rear vent

34: Assembly Department

341: Screw Hole

342: auxiliary rear vent

343: Reinforcement Ribs

35: Connection part

351: Connect the vent

36: Joint

361: Joint Vent

37: Central vent

40: Transmission assembly

41: Actuator

43: front handle

45: auxiliary front vent

46: Transmission

50: drive assembly

51: circuit unit

511: cooling fins

52: electric motor

53: Fan

60: handle

61: Arm

611: Docking Department

62: Grip

63: Interval

70: battery unit

71: Rear vent of battery

72: Front vent of battery

80: front shell

81: Socket

82: Front vent

83: Thermal insulation gasket

84: heat sink

85: Groove

C: Vertical

In order to enable your reviewer to further understand the purpose, features and effects of the present invention, two preferred embodiments are listed below, which will be described in detail in conjunction with the drawings. Among them: Figure 1 is a schematic diagram of a conventional electric tool. Fig. 2 is a perspective view of the electric tool according to the first preferred embodiment of the present invention. Fig. 3 is a side view of Fig. 2. Fig. 4 is a partial cross-sectional view of Fig. 2. Fig. 5 is an exploded perspective view of the grip and the housing of Fig. 2 separated. Fig. 6 is a partially enlarged perspective exploded view of the grip and housing part of Fig. 4; Fig. 7 is a partially enlarged three-dimensional exploded view of the housing and battery unit of the electric tool of the present invention. Fig. 8 is a partial cross-sectional view of the assembly position between the grip of the electric tool of the present invention and the housing taken along the line 8-8 in Fig. 3. Fig. 9 is a perspective view of the power tool of the present invention on the side where the front handle is not installed. Fig. 10 is a front sectional view of the power tool of the present invention taken along the line 10-10 in Fig. 3; Fig. 11 is a schematic diagram showing the positions of the handles installed in different directions before the electric tool of the present invention. Fig. 12 is a partial cross-sectional schematic diagram of the air flow of the electric tool of the present invention. Fig. 13 is a perspective view of the overall air flow of the electric tool of the present invention. 14 is a perspective view of the second preferred embodiment of the electric tool of the present invention and a schematic diagram showing the flow of airflow. Fig. 15 is a front sectional view of Fig. 14 at the same position as Fig. 10;

30: Rear shell

31: accommodating space

311: Large Diameter Section

312: Trail section

32: Rear vent

35: Connection part

351: Connect the vent

36: Joint

361: Joint Vent

40: Transmission assembly

41: Actuator

43: front handle

50: drive assembly

51: circuit unit

511: cooling fins

52: electric motor

53: Fan

60: handle

61: Arm

611: Docking Department

63: Interval

70: battery unit

71: Rear vent of battery

80: front shell

82: Front vent

84: heat sink

85: Groove

C: Vertical

Claims (10)

An electric tool with a front and rear ventilation structure, comprising: a housing with an accommodating space provided at the rear end, and a longitudinal direction is formed at the front and rear ends of the accommodating space; the housing is provided with at least one rear vent and at least one Front vents, the rear vents and the front vents are connected to the accommodating space, and each of the front vents is arranged in front of each of the rear vents; the shell is composed of a rear shell and a front The housing is formed by the housing; the accommodating space is arranged in the rear housing, the transmission device and the actuator are arranged in the front housing, the actuator is located at the front end of the transmission assembly and protrudes out of the front housing, each The rear vent is arranged on the rear housing, and each of the front vents is arranged on the front housing; the front end of the rear housing is provided with a connecting part which is connected with the front housing, and the connecting part is connected to the front housing. At least one connecting vent communicates with the accommodating space, and each connecting vent communicates with each corresponding front vent; a transmission assembly is arranged at the front end of the housing and has a Transmission device and an actuator, the actuator is driven by the transmission device and arranged at the front end of the transmission assembly, the front vent is arranged on the peripheral side of the transmission device; a circuit unit, an electric motor and a fan , Is arranged along the longitudinal direction of the accommodating space, and the electric motor drives the fan and the transmission device to rotate. The electric tool according to claim 1, wherein: the fan, the electric motor, and the circuit unit are arranged in order from front to back in the accommodating space; the The circuit unit is close to each of the rear vents, the fan is close to each of the front vents, and the air flows from each of the rear vents to each of the front vents. The electric tool according to claim 1, wherein: the fan, the electric motor, and the circuit unit are sequentially arranged from front to back in the accommodating space; the circuit unit is close to each of the rear vents, and the fan is close to Each of the front vents and the housing are provided with at least one central vent, and air is sucked in from each of the front vents and each of the rear vents and then flows to the central vent and is discharged. The electric tool according to claim 1, wherein: at least one groove is provided at the position where the front shell of the housing and the rear shell meet; an auxiliary front is formed between the front end of the rear shell and each of the grooves. A vent, the auxiliary front vent communicates with the accommodating space, and each auxiliary front vent communicates with each corresponding groove. The electric tool according to claim 1, wherein: a heat dissipation part is provided on the outer side of the front housing. The electric tool according to claim 5, wherein: the heat dissipation portion may have a fin configuration. The electric tool according to claim 1, wherein: a front handle is connected to the front side of the housing. The electric tool according to claim 7, wherein: the housing is provided with two sockets, and the front handle can be connected to any socket. The electric tool according to claim 7, wherein: a heat insulation gasket is arranged between the front handle and the housing. The electric tool according to any one of claims 1 to 3, wherein: the rear end of the housing is provided with a handle; the handle has a grip portion and two arms, and the two arms protrude from both ends of the grip portion , And a space is formed between the holding part and the two arms.

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