TWI810833B - Electric wrench for tire - Google Patents

Abstract

The invention relates to an electric wrench for tires, which includes: a head, a driving head is installed at the front end, a hollow rod body is extended at the rear end, and a sensing area is arranged on the outside of the rod body; a torque sensing unit is set On the sensing area; an outer casing, which is sleeved on the outside of the head; a flexible member is arranged between the outer casing and the head, so that a deformation interruption zone is formed between the outer casing and the head ; Through the outer casing, the torque sensing unit can be protected, and at the same time, the flexible member can cause a deformation interruption between the outer casing and the head, so that the torque sensing unit can accurately measure to the torque value of the electric wrench.

Description

Electric wrench for tire

The present invention relates to power tools, in particular to an electric wrench for tires with flexibility between the upper and lower shells, which can reduce measurement errors.

In order to reduce the user's effort and improve operating efficiency, the current hand tools, in addition to hand tools that are simply manually operated, also have power tools that use electric motors or pneumatic pressure as the source of power. Among them, electric motors As a power source, power tools are favored by users because they do not require an external power source and are relatively convenient to operate. However, during the driving process of the driving motor of the power tool, the output is controlled by changing the amperage size.

It is known to use electric tools, because in the process of driving, there will be inertia, so that the applied torque will exceed the preset torque value, resulting in inaccurate torque application, and, when the torque is high, the long-term high amperage output, which also reduces battery life. Therefore, most of the power tools are used as an auxiliary, when the screw moving parts are moved forward or backward, and when the screw is to be tightened or loosened, the force will be applied through the user's hand, especially When the screw is tightened, the force exerted by the hand can accurately give the torque value to ensure that the workpiece can be tightened within the set torque value.

However, regardless of whether the value is applied electrically or manually, when sensing the torque value, it is necessary to use a strain gauge to sense the deformation of the power tool itself and convert it into a corresponding torque value. In order to sense the torque value accurately, the strain gauge It will be attached to the power tool close to the position where the force is applied, and the more components in the power tool are combined, the deformation will be distributed to each component, resulting in less sensitive sensing of the strain gauge or being affected by changes in the length of the force arm. The measured torque value is wrong due to the influence.

The main purpose of the present invention is to provide an electric wrench, which can reduce the interference of components and improve the accuracy of the strain gauge.

Another object of the present invention is to provide an electric wrench, especially for dismounting and installing tires.

In order to achieve the above purpose, the present invention provides an electric wrench for tires, comprising: A head, a driving head is installed at the front end, a hollow rod body is extended at the rear end, and a sensing area is arranged on the outside of the rod body; A torque sensing unit is arranged on the sensing area; A driving unit, which has a power source, and a driving rod is arranged at the front end, and the driving rod passes through the rod body to drive the driving head to move through a connecting part; An outer shell, including a protective shell and a lower shell; the protective shell is arranged outside the torque sensing unit and a part of the rod body; the lower shell is arranged outside the power source of the drive unit and outside the partial protective shell ; A flexible part is arranged between the outer casing and the head, so that a deformation interruption area is formed between the outer casing and the head.

Preferably, the protective shell is set separately from the lower shell system; one end of the protective shell is fixed to the hollow rod body of the head, and the other end is connected to the lower shell; the lower shell system covers the drive unit The flexible part is arranged on the outer side of the power source and at the junction of the protective shell and the lower shell.

Preferably, the flexible member is arranged at the front end of the protective case, and the flexible member is arranged between the protective case and the rod body.

In order to achieve the above purpose, the present invention provides another electric wrench for tires, including: A head, a driving head is installed at the front end, a hollow rod body is extended at the rear end, and a sensing area is arranged on the outside of the rod body; A torque sensing unit is arranged on the sensing area; A driving unit, which has a power source, and a driving rod is arranged at the front end, and the driving rod passes through the rod body to drive the driving head to move through a connecting part; An outer casing includes a lower casing; the lower casing is arranged) on the outside of the power source of the drive unit and on the outside of a part of the head; A flexible part is a rubber sleeve, the rubber sleeve is passed through the upper end of the rod body of the head and is in contact with the lower shell of the outer shell, and the rubber sleeve is covered with the torque sensor The unit; the flexible part forms a deformation interruption zone between the outer shell and the head.

In the electric wrench for tires provided by the present invention, the outer shell can protect the torque sensing unit to prevent the torque sensing unit from being in contact with the outside world, and the flexible part in the outer shell can prevent the outer shell from directly contacting with the outside world. The heads are connected to form a deformation interruption zone. When the head exerts force, there will be a relative displacement change between the head and the outer shell, so that the outer shell will not deform along with the head. The stress on the head can be prevented from extending to the outer shell, and the torque sensing value of the torque sensing unit can be close to the actual torque value.

Please refer to Figures 1 to 5, which is an electric wrench 10 provided by a preferred embodiment of the present invention. The electric wrench 10 is mainly used for disassembling and installing automobile tires, including;

A head 20, the front end of which is pivotally provided with a chamber 21, a drive head 22 is installed in the chamber 21, a hollow rod body 23 extends from the rear end of the head 20, and a through groove 231 is formed in the rod body 23 , the through groove 231 communicates with the chamber 21, and a sensing area 24 is arranged on the outer side, and the sensing area 24 is arranged at the central position of the rod body 23, and has a certain distance from the driving head 22, and the The sensing area 24 is formed by two planes 241 arranged in parallel, and the two planes 241 are located on both sides of the drive head 22 in the axial direction;

A torque sensing unit 30, please refer to shown in Fig. 2, in the present embodiment it is made of two strain gauges 31, and these two strain gauges 31 are arranged on the two planes 241 of this sensing area 24; Wherein, The torque sensing unit 30 can also only use a single strain gauge 31 attached to the plane 241 of any sensing area 24 .

A drive unit 40, please refer to shown in Fig. 2, it has a power source 41, and the front end is provided with a drive rod 42, and this drive rod 42 is passed through behind the groove 231 of this rod body 23, and the front end of the drive rod 42 And use a connecting portion 421 to engage with the drive head 22 so that the drive unit 40 can drive the drive head 22 to move;

An outer casing 5, please refer to FIG. 2 to FIG. 4, which is sleeved on the outside of the drive unit 40, the partial rod body 23 and the torque sensing unit 30; the outer casing 5 includes a protective shell 50 And the lower shell 60; the protective shell 50 is composed of two half-shell parts 51 overlapping each other, and an inner storage space 52 is formed in the middle of the two half-shell parts 51, and the protective shell 50 is arranged on the partial rod body 23 outside, the front end of the two half shells 51 is fixed on the rod body 23 with a screw connection, the fixed position is located in front of the sensing area 24, and the rear end of the two half shells 51 is kept suspended state, and the torque sensing unit 30 is disposed in the inner storage space 52 , so that the protective case 50 can form a good protection effect on the outside of the torque sensing unit 30 .

The lower shell 60 is set in the same way as the protective shell 50, and is formed by overlapping two lower half-shell parts 61. An outer accommodation space 62 is formed between the two lower shell parts 61. The lower shell The body 60 is arranged on the outer side of the rear of the protective case 50, and the outer accommodation space 62 is covered with a part of the protective case 50 and the drive unit 40. The front end of the outer accommodation space 62 is provided with a ring groove 63, The inner ring of the ring groove 63 is provided with a flexible member 64 , the flexible member 64 can be made of a non-metallic material that can deform under force, and the flexible member 64 is made of a rubber ring 641 . The flexible member 64 is close to the outer circumference of the protective shell 50 and has flexibility, so that the flexible member 64 can be arranged around the lower peripheral side of the protective shell 50 with flexibility, so that the protective shell 50 is pressed against It will not shake, and at the same time, the flexible member 64 can form a dustproof effect between the lower casing 60 and the protective casing 50; the bottom side of the lower casing 60 is provided with a placement part 65, the placement The placement part 65 is roughly located at the center of gravity of the whole electric wrench 10, and its top surface is provided with a placement plane 651. When the electric wrench 10 is placed, the placement plane 651 can be in contact with the table, so that the electric wrench 10 can be Maintain a fixed position without scrolling.

A display unit 70, as shown in FIG. 5, is arranged on the top surface of the lower casing 60, and has a display screen 71 and an LED unit 72. The display screen 71 can display relevant torque values and setting values etc., and the LED unit 72 can display the status of the current operation, such as on/off status, torque value ratio and other values. The user can easily observe relevant information through the display unit 70 . Moreover, the display unit 70 is perpendicular to the direction of the driving head 22 .

A trigger 80, please refer to Fig. 6 again, it is pivotally arranged on the bottom surface of the lower casing 60, positioned at the rear position of the placement portion 65, that is, it intersects the display unit 70 at 180 degrees; One end of the trigger 80 is pivoted on the lower housing 60 and can drive the driving unit 40 to rotate by pressing to drive the driving head 22 to rotate. A safety switch 81 is pivotally arranged on the trigger 80, and the safety switch includes a rotary Rod 811 and a spring 812, the rotary rod 811 is pivoted on the trigger 80, and can move with the trigger 80, the spring 812 can generate an elastic force to push the rotary rod 811, so that the rotary rod 811 can hold On the lower housing 60, the trigger 80 cannot be pressed; when pressing the trigger 80, it is necessary to push the rotary rod 811 first, so that the rotary rod 811 will fit on the trigger 80. At this time, the trigger 80 can be pressed and moved. When the rotary rod 811 is released, the spring 812 will generate elastic force to push the rotary rod 811 back to the upright state, and the trigger 80 will become a safe state that cannot be pressed.

During operation, please refer to Figs. 6 to 9, first connect the drive head 22 with a sleeve, and then put the sleeve into a nut that locks the tire, because the tire will be perpendicular to the ground, so the The axial direction of the nut on the tire will be parallel to the ground, and the axial direction of the drive head 22 will also be parallel to the ground. At this time, the display screen 71 of the display unit 70 will form an upward display state, because the user is applying force. During the process, force is applied from the top of the electric wrench 10 toward the bottom end, and the user's eyes will be relatively located at the top of the electric wrench 10, so the user can easily see the display screen 71 during the force application process. At the same time, because the user holds the electric wrench from top to bottom, the user can conveniently hold the trigger 80 at the bottom, which is also quite convenient to hold in operation.

When the user locks the nut, please refer to FIG. 6 , and first press the trigger 80 so that the power source 41 of the drive unit 40 can drive the drive rod 42 so that the connecting portion 421 of the drive rod 42 can be Drive the driving head 22 to rotate rapidly; the nut can be screwed in quickly, and when the nut is completely screwed in, it will enter the lock screw lock fastening stage, because the increase in torque will reduce the consumption current of the power source 41 increase, so the drive of the power source 41 will be stopped. Then, the user applies force to the position of the drive head 22 by applying force to the housing 60 under the outer shell 5; when the force is applied, the rod body 23 of the head 20 will be deformed due to the force, Further, the two strain gauges 31 of the torque sensing unit 30 attached to the sensing area 24 will also convert the torque value of the drive head 22 due to the deformation of the rod body 23, and at the same time, because the protective shell 50 and There is the flexible part 64 between the lower shell 60, so when the protective shell 50 is bent and deformed along with the rod body 23, the force will be absorbed when it is transmitted to the position of the flexible part 64 and a deformation interruption zone will be generated. , the deformation of the head 20 will be buffered by the flexible member 64 to interrupt the transmission of deformation, so that the position of the lower casing 60 will not be deformed with the deformation of the head 20, so that the lower casing The body 60 will not affect the sensing result of the torque sensing unit 30, so that the electric wrench 10 can form a better torque sensing value; at the same time, the flexible member 64 can maintain the lower casing 60 and the protective shell 50 The tightness of the joint position can prevent dust or foreign matter from falling in the normal state or during the rotation process; the deformation sensed by the torque sensing unit 30 is converted into a torque value and then transmitted to the display screen of the display unit 70 71 displays the displayed value, and the user can make the torque value applied to the nut by the electric wrench 10 accurately reach the preset value through the force applied by the hand, and will not be generated by the power source 41 of the drive unit 40. Excessive current or the inertial force of the power source causes the drive head 22 to generate excessive torsion force on the nut.

After the electric wrench 10 is used up, please refer to FIG. 9 , the placement plane 651 of the placement portion 65 can be placed on the ground or on the table, because the placement plane 651 is the center of gravity and is high above the The lower housing 60, so the placement plane 651 can keep the electric wrench 10 fixed, so that the electric wrench 10 is not easy to turn over and roll.

See also shown in Figure 10, it is the electric wrench of the second preferred implementation of the present invention, its main structure is the same as the previous preferred embodiment, the same parts are represented by the same symbols, wherein:

The outer shell 5, the protective shell 50 and the lower shell 60 are connected together, and can be integrally formed or fixedly connected between the protective shell 50 and the lower shell 60. The contents of the protective shell 50 A flexible member 53 is arranged between the space 52 and the rod body 23 of the head 20, and the flexible member 53 is a rubber ring 531, which is attached to the outer peripheral side of the rod body 23, The position between the protective shell 50 and the rod body 23 is fixed, and when force is applied to rotate the drive head 22, the protective shell 50 and the lower housing 60 will be affected by the flexible member 53 without deformation , so that the torque sensing unit 30 can only sense the deformation of the rod body 23, so that the torque sensing unit 30 can accurately sense the value of the applied torque.

Please refer to Fig. 11, it is the electric wrench of the third preferred implementation of the present invention, its main structure is the same as that of the first preferred embodiment, and the same parts are represented by the same symbols, wherein:

The outer casing 5 is composed of the lower casing 60, and the lower casing 60 covers the rear end side of the rod body 23 of the drive unit 40 and the partial head 20; the lower casing 60 and the head A flexible part 90 is arranged between 20; the flexible part 90 is a rubber sleeve 91, and the rubber sleeve 91 is attached to the outer ring side of the rod body 23 and covers the sensing area 24, And can have a good protective effect for the two strain gauges 31 of the torque sensing unit 30, and, the front end of the casing 60 under the outer casing 5 will be in contact with the periphery of the flexible member 90, so that the lower casing The position of the body 60 can be fixed. When the electric wrench 10 is rotated with force, the rubber sleeve 91 of the flexible member 90 can form a deformation interruption area, so that the lower housing 60 will not deform with the force of the rod body 23. Deformation can avoid reducing the sensing value by dispersing the deformation amount of the rod body 23 under force.

In the electric wrench of the present invention, the torque sensing unit can form a protective effect through the external structure, which can avoid damage to the torque sensing unit. The head is deformed by force, which can improve the accuracy of the torque sensing unit.

The above-mentioned embodiments are only intended to illustrate the technical means of the present invention and not to limit them. 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 is the first structure in this field, and has the enhancement of practical effect, and the application is filed according to the law.

10: Electric wrench

20: head

21: Containment room

22: Drive head

23: rod body

231: Grooving

24: Sensing area

241: Plane

30:Torque sensing unit

31: Strain gauge

40: drive unit

41: power source

42: Drive rod

421: connection part

5: Outer shell

50: Protective shell

51: half shell

52: inner storage space

53: flexible parts

531: Apron

60: lower shell

61: lower half shell

62: External storage space

63: ring groove

64: flexible parts

641: Apron

65: Placement Department

651: Place plane

70: Display unit

71: display screen

72: LED unit

80: trigger

81: Safety switch

811:Rotary

812: spring

90: flexible parts

91: rubber sleeve

In order to enable your review committee to further understand the purpose, characteristics and achieved effects of the present invention, three preferred embodiments are listed below, which will be described in detail with the accompanying drawings. Among them: Fig. 1 is a perspective view of an electric wrench according to a preferred embodiment of the present invention. Fig. 2 is a three-dimensional exploded view of an electric wrench according to a preferred embodiment of the present invention. Fig. 3 is a schematic cross-sectional view of an electric wrench according to a preferred embodiment of the present invention. Fig. 4 is a partial cross-sectional view of the connecting position of the protective case and the lower case in a preferred embodiment of the present invention. Fig. 5 is a top view of an electric wrench according to a preferred embodiment of the present invention. Fig. 6 is a schematic cross-sectional view of a trigger pressing action in a preferred embodiment of the present invention. Fig. 7 is a schematic diagram of the action of manually applying torque to the tire in a preferred embodiment of the present invention. Fig. 8 is a partial cross-sectional view of the connecting position of the protective case and the lower casing in a stressed state according to a preferred embodiment of the present invention. Fig. 9 is a schematic diagram of an electric wrench laid flat according to a preferred embodiment of the present invention. Fig. 10 is a schematic partial cross-sectional view of the connection between the head and the outer shell of a second preferred embodiment of the present invention. Fig. 11 is a schematic partial cross-sectional view of the connection between the head and the outer shell of a third preferred embodiment of the present invention.

20: head

21: Containment room

22: Drive head

23: rod body

24: Sensing area

241: Plane

30:Torque sensing unit

31: Strain gauge

5: Outer shell

50: Protective shell

51: half shell

52: inner storage space

60: lower shell

61: lower half shell

62: External storage space

63: ring groove

64: flexible parts

641: Apron

65: Placement Department

70: Display unit

Claims (7)

An electric wrench for tires, which includes: a head, a driving head is installed at the front end, a hollow rod body is extended at the rear end, and a sensing area is arranged on the outside of the rod body; a torque sensing unit is arranged on the sensing area On the area; a drive unit, which has a power source, and a drive rod is provided at the front end, and after the drive rod passes through the hollow rod body, the front end drives the drive head to move with a connecting part; an outer shell, which is composed of There is a protective shell and a lower shell; the protective shell is arranged on the outside of the torque sensing unit and a part of the hollow rod body; the lower shell is arranged on the outer side of the drive unit and the outer part of the protective shell; a flexible part is set Between the outer shell and the head, a deformation interruption zone is formed between the outer shell and the head; the protective shell is set separately from the lower shell; one end of the protective shell is fixed to the hollow rod in the head Body, the other end of which is in contact with the lower case; the lower case is covered on the outside of the power source of the drive unit, and the flexible part is provided at the junction of the protective case and the lower case; the lower case The inner ring is provided with a groove, the flexible member is arranged in the groove, and the flexible member is arranged between the protective shell and the lower shell. The electric wrench for tires as described in Claim 1, wherein: the flexible member is a rubber ring. The electric wrench for tires according to claim 1, further comprising a display unit disposed on the outer peripheral side of the casing, and the display unit is perpendicular to the axial direction of the drive head. The electric wrench for tires according to claim 3, wherein: the display unit includes a display screen and an LED unit. The electric wrench for tires as described in Claim 1, wherein: the outer casing is protruded with a placing portion, and the top surface of the placing portion is provided with a placing plane. The electric wrench for tires according to claim 5, wherein: the outer casing is provided with a trigger, and the placing part and the trigger are arranged on the same plane. The electric wrench for tires as described in claim 6, wherein: the trigger is provided with a safety switch, which includes a rotary rod and a spring, and the spring can give the rotary rod an elastic force, so that the rotary rod will resist between the trigger and the outer housing.

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