JP2020148653A - Torque measuring device and protective member - Google Patents

Abstract

To provide a torque measuring device and a protective member with which the transfer of mechanical shock from the outside is suppressed to a possible minimum and durability is improved.SOLUTION: The torque measuring device comprises: a columnar shaped strain-causing element; a strain amount detection unit for detecting the amount of strain of the strain element due to the tightening operation of a fastening tool; a communication unit for transmitting information pertaining to the strain amount detected by the strain amount detection unit; a housing cover for enclosing each of the strain amount detection unit and the communication unit provided in the outer shape part of the strain-causing element; and a pair of protective members composed of a first protective member provided between a fitting unit to which the fastening tool is fitted and the hosing cover in the axial direction of the strain-causing element and a second protective member provided between a fastening unit for tightening a fastening member and the housing cover. The opposite side dimension of this pair of protective members is larger than the widthwise dimension of the housing cover, with the housing cover protected by the first and second protective members.SELECTED DRAWING: Figure 4

Description

The present invention relates to a torque measuring device and a protective member.

A torque measuring device for measuring a fastening torque value of tightening a tightening member such as a bolt or a nut with a tightening tool such as a wrench or a screwdriver is known. This torque measuring device is used by being mounted between the tightening tool and the tightening member. This torque measuring device can be attached to and detached from the tightening tool.

Further, some of these torque measuring devices are provided with a wireless communication function and a power supply unit in order to manage the measured tightening torque value by an external information processing device.

As a torque measuring device for measuring the tightening torque value, for example, there is a technique as shown in Patent Document 1. It is shown that Patent Document 1 includes a main body having an input unit and an output unit, a sensor used for detection provided in the main body, and a wireless communication type connection rod including a sensor and a wireless transmission device electrically connected to the sensor. Has been done.

Japanese Unexamined Patent Publication No. 2015-119465

Such a torque measuring device is used by being attached to a tightening tool such as a wrench or a screwdriver, and may come off depending on the attached state and the used state. In addition, when not in use, the torque measuring device is removed from the tightening tool and stored, and the torque measuring device may fall due to carelessness.

If a strong impact is applied to the torque measuring device due to dropping or dropping, not only will it not be possible to measure accurate torque values, but in the worst case it will be damaged.

On the other hand, the strength of the torque measuring device may be increased so that the torque measuring device is not damaged or cannot be measured even if it falls off. For example, it is conceivable to use a metal protective cover to protect the wireless communication function and the power supply unit, but this leads to an increase in weight and a significant increase in cost.

If the housing portion is made of metal, in addition to this, a phenomenon that radio waves are difficult to propagate (or radio waves are blocked) may occur, so that the wireless communication function may not work effectively.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a torque measuring device and a protective member that minimize the transmission of an impact from the outside and improve the durability.

The torque measuring device of the present invention includes a columnar-shaped strain-causing body, a mounting portion provided at one end of the strain-causing body in the axial direction and for mounting a tightening tool, and the other end of the strain-causing body in the axial direction. A tightening portion provided in the above and used for tightening the tightening member, a strain amount detecting unit for detecting the strain amount of the strain-causing body by the fastening operation of the tightening tool, and the strain amount detecting unit detected by the strain amount detecting unit. A communication unit that transmits information about the strain amount to the communication destination, a housing cover that includes each of the strain amount detection unit and the communication unit provided on the outer shape of the strain generator, and a shaft of the strain generator. A first protective member provided between the mounting portion and the housing cover in the direction, and a second protective member provided between the tightening portion and the housing cover in the axial direction of the strain generating body. The pair of protective members include a pair of protective members, the opposite side dimension of which is larger than the widthwise dimension of the housing cover, and the first protective member and the second protective member. To protect the housing cover.

Preferably, the main body of the protective member mounted on the torque measuring device is a pair of members having a polygonal shape.

Preferably, the protective member is formed of metal and has one or more holes so that information about the amount of strain can be transmitted axially through the holes.

Preferably, the protective member is equipped with a cover made of an elastic body.

Preferably, the protective member includes an upper protective member, which is the first protective member mounted between the upper end of the housing cover and the mounting portion of the strain-causing body, and the strain-generating body. It is composed of a lower protective member which is the second protective member mounted between the lower end of the housing cover and the tightening portion, and with respect to the strain-causing body, one side surface of the upper protective member and Both surfaces of one side of the lower protective member are provided so as to be parallel to the mounting surface on which the tightening tool is mounted.

The protective member according to the present invention includes a columnar-shaped strain-causing body, a mounting portion provided at one end of the strain-causing body in the axial direction and mounted on a tightening tool, and the strain-causing body in the axial direction. The tightening portion provided at the end and used for tightening the tightening member, the strain amount detecting unit for electrically detecting the strain amount of the strain-causing body due to the fastening operation of the tightening tool, and the strain amount detecting unit. It includes a communication unit that transmits the detected information on the strain amount to the communication destination, and a housing cover that includes each of the strain amount detection unit and the communication unit provided on the outer shape of the strain generating body. A protective member including a first protective member and a second protective member mounted on a torque measuring device, wherein the first protective member and the second protective member have opposite side dimensions of the housing cover. It is made of a polygonal metal plate that is larger than the dimension in the width direction orthogonal to the axial direction and has a hole formed in a part thereof, and the first protective member is attached to the mounting portion in the axial direction of the strain generating body. The second protective member is provided between the housing cover and the tightening portion in the axial direction of the strain generating body and the housing cover, and the first protective member and the second protective member are provided. The housing cover is protected by a protective member.

According to the present invention, it is possible to minimize the transmission of an impact from the outside and improve the durability.

The figure which shows the schematic structure of the torque measuring device and the tightening tool attached to the torque measuring device in embodiment of this invention. A plan view of the internal structure of the device as viewed from the front side. Rear view of the internal structure of the device from the rear side. An exploded perspective view of the device. A perspective view of the device after assembly. A perspective view of a protective member attached to the device.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings. The present invention is not limited to this embodiment, and all other feasible embodiments, examples, operational techniques, etc. that can be considered by those skilled in the art based on this embodiment are included in the scope of the present invention. To do.

FIG. 1 is a diagram showing a schematic configuration of a torque measuring device and a tightening tool mounted on the torque measuring device according to the embodiment of the present invention.

In the following description, the XYZ coordinate system is set as the three-dimensional Cartesian coordinate system for convenience of explanation. In this XYZ coordinate system, the Z-axis direction is a direction parallel to the axial direction (vertical direction) of the central axis L of the torque measuring device 1 shown in FIG. 2, and is the longitudinal direction (vertical direction) of the torque measuring device 1. To do. The Y-axis direction is a direction orthogonal to the Z-axis direction, and is the lateral direction (left-right direction) of the torque measuring device 1 shown in FIG. The X-axis direction is a direction orthogonal to both the Y-axis direction and the Z-axis direction, and is the front / depth direction (front-back direction) of the paper surface in FIG. Therefore, the X-axis and the Y-axis are axes extending in the horizontal plane, and the plane defined by the X-axis and the Y-axis (XY plane) coincides with the horizontal plane.

FIG. 1 shows a usage example of the torque measuring device 1, and shows a state in which a ratchet handle 100, which is an example of a tightening tool, is attached to one end of the torque measuring device 1. The ratchet handle 100 is merely an example, and may be a T-shaped handle, a spinner handle, or the like. In addition, it is also possible to provide a universal joint, an extension bar, or the like between these and the torque measuring device 1.

Since the present invention relates to the torque measuring device 1, for convenience of explanation, the torque measuring device 1 will be mainly used, and the ratchet handle 100 will be attached to the torque measuring device 1.

The ratchet handle 100 includes a head portion 102 provided on one end side of a long handle main body 101, and a handle portion 103 gripped by an operator on one end side of the handle main body 101.

The head portion 102 is provided with a drive portion 104 attached via a ratchet mechanism. Inside the handle body 101, a toggle mechanism as a torque limiter, a torque setting mechanism for setting a set torque value, and the like are housed.

The drive portion 104 is inserted into and fitted into the fitting recess 3a of the handle mounting portion 3, which will be described later, provided on one end side of the torque measuring device 1. As a result, the ratchet handle 100 is attached to the torque measuring device 1.

When the ratchet handle 100 is rotated in a predetermined direction when the operator holds the handle portion 103 and performs the fastening operation, the tightening torque from the handle portion 103 is applied to the tightening member via the head portion 102. It is transmitted and tightened. The tightening torque value at the time of the fastening operation or the completion of fastening is transmitted from the communication unit 6 described later of the torque measuring device 1 to a predetermined communication destination.

Next, the torque measuring device 1 according to the present invention will be described with reference to FIGS. 2 to 5. As shown in FIGS. 2 to 5, the torque measuring device 1 according to the embodiment of the present invention includes a strain generating body 2, a handle mounting portion 3, a tightening portion 4, a strain amount detecting unit 5, and a communication unit 6. A power supply unit 7 and a protective member 8 are provided.

The strain-causing body 2 is formed by a metal pillar shape (cylinder, prism, etc.) and serves as a base for measuring a tightening torque value. The strain-causing body 2 is provided with a handle mounting portion 3 at one end in the axial direction (longitudinal direction) (Z-axis direction) and a tightening portion 4 at the other end.

The substantially central portion of the strain generating body 2 is in the width direction (short direction) (Y axis) orthogonal to the axial direction from one end where the handle mounting portion 3 is provided and the other end where the tightening portion 4 is provided. The direction) is formed to be thin, and is a portion where distortion occurs due to the application of tightening torque during the fastening operation. Therefore, the substantially central portion of the strain generating body 2 is also referred to as a strain generating portion 2a. The outer shape of the strain generating portion 2a has a multi-faceted structure, and one surface thereof is a mounting surface on which the strain amount detecting portion 5 capable of detecting the strain amount of the strain generating body 2 generated during the fastening operation can be mounted. is there.

The handle mounting portion 3 is provided at one end of the strain generating body 2, and is a mounting portion for mounting the head portion 102 of the ratchet handle 100. A fitting recess 3a into which the drive portion 104 of the head portion 102 is inserted is provided on the upper surface of the axial tip portion of the handle mounting portion 3. The fitting recess 3a is provided so that its axis is located on the central axis L of the torque measuring device 1, and its opening size is preferably substantially the same as the outer size of the drive portion 104.

The handle mounting portion 3 transmits the tightening torque generated when the ratchet handle 100 is fastened by the operator to the tightening portion 4 via the strain generating body 2. That is, the handle mounting portion 3 functions as an input portion in which the tightening torque due to the fastening operation is input along the central axis L.

Subsequently, the tightening portion 4 is provided at one end of the strain generating body 2, and an engaging member can be mounted according to the type and size of the tightening member, in order to tighten the tightening member. It is used. The tightening portion 4 is provided at the other end opposite to the handle mounting portion 3. Therefore, when the handle mounting portion 3 is used as an input portion, the tightening portion 4 functions as an output portion. The tightening torque input from the input unit is transmitted and output from the output unit.

Further, the tightening portion 4 is provided with a fitting convex portion 4a to be inserted into the fitting concave portion of the engaging member. The fitting convex portion 4a is provided so that its axis center is located on the central axis L, and its outer dimension (opposite side dimension) is preferably substantially the same as the opening dimension of the fitting recess of the engaging member. The fitting convex portion 4a has the same shape and size as the drive portion 104 of the ratchet handle 100.

The tightening portion 4 transmits the tightening torque at the time of the fastening operation transmitted from the handle mounting portion 3 via the strain generating body 2 to the tightening member via the engaging member. The tightening portion 4 functions as an output portion that outputs the tightening torque transmitted from the handle mounting portion 3 through the strain generating body 2 to the engaging member along the central axis L.

The engaging member to be attached to the tightening portion 4 is composed of a socket or the like according to the type and size of the tightening member such as bolts and nuts. An extension bar may be provided between the socket and the torque measuring device 1.

When the socket is attached to the tightening portion 4, the tightening torque is transmitted to the tightening member via the socket. As described above, the tightening portion 4 is sometimes referred to as a "mounting portion" because it is possible to attach a socket, and in order to distinguish it from the handle mounting portion 3 described above, the handle mounting portion 3 is referred to as a "first mounting portion". The "part" and the tightening part 4 may be referred to as a "second mounting part".

The strain amount detection unit 5, the communication unit 6, and the power supply unit 7 are electronic devices 9 installed on the mounting surface which is the outer shape of the strain generating body 2. In FIG. 5, a housing cover 1a made of synthetic resin is covered so as to include these electronic devices 9. As a result, no external force is directly applied to the electronic device 9. The outer shape of the housing cover 1a may have any configuration such as a polygonal shape or a cylindrical shape. The torque measuring device 1 shown in FIG. 5 shows a cylindrical shape for convenience of explanation, but the present invention is not limited to this.

Further, in the example shown in FIG. 4, the housing cover 1a is divided into two parts. This form may also have a shape that includes the entire electronic device 9 and covers a part or all of the strain generating body 2.

The strain amount detecting unit 5 is also referred to as a strain gauge, and as shown in FIGS. 2 and 4, the strain generated by being installed in the strain generating unit 2a of the strain generating body 2 causes distortion due to the deformation of the strain generating body 2 generated during the fastening operation. The amount is detected electrically. When the strain amount detecting unit 5 detects the strain amount corresponding to the tightening torque transmitted during the fastening operation, the strain amount detecting unit 5 outputs information (electrical resistance value) regarding the strain amount to the communication unit 6. In the present embodiment, the strain amount detecting unit 5 is provided as a single unit for the torque measuring device 1, but the present invention is not limited to this, and a plurality of strain amount detecting units 5 may be provided. Good. In the latter case, each of the strain amount detection units 5 outputs the detected strain amount to the communication unit 6.

The communication unit 6 is composed of a network interface that controls wireless communication with another device via a communication network according to a predetermined protocol. The communication unit 6 includes short-range wireless communication such as Bluetooth (registered trademark) and Wi-Fi having a communication distance of several meters to several tens of meters, or wireless communication using a carrier network provided by a communication carrier. , It suffices to have a function capable of communicating with the communication destination.

The communication unit 6 transmits information (electrical resistance value) regarding the amount of distortion detected by the strain amount detection unit 5 to the communication destination. The communication destination at this time is a device (terminal) linked according to a predetermined protocol, for example, the set torque value set for the tightening member and the tightening torque applied when fastening the tightening member. There is a management terminal that manages by associating with. In this management terminal, it is possible to acquire and store the tightening torque value received from the torque measuring device 1 via the communication unit 6.

Further, the power supply unit 7 is a power source that supplies electric power used for communication to the communication unit 6. More specifically, the power supply unit 7 is composed of a secondary battery (rechargeable battery) that can be charged using an external power source. As shown in FIG. 4, the power supply unit 7 can be connected to a charging terminal 1b provided on the housing cover 1a, and is supplied from an external device via a charging cable (not shown) connected to the charging terminal 1b. Stores the generated power.

The charging method of the power supply unit 7 is not limited to charging with a charging cable, and for example, a detachable battery can be removed and charged at the time of charging.

The protective member 8 is composed of a pair of members whose main body has a polygonal shape. The detailed configuration of the protective member 8 is shown in FIG. 6 and will be described later.

The torque measuring device 1 has, as the protective member 8, an upper protective member 81 which is a first protective member and a lower protective member 82 which is a second protective member.

The upper protective member 81, which is the first protective member, is provided between the handle mounting portion 3 and the upper end of the housing cover 1a. Further, the lower protective member 82, which is the second protective member, is provided between the tightening portion 4 and the lower end of the housing cover 1a. The upper protective member 81 and the lower protective member 82 are provided in pairs having substantially the same shape, and the opposite side dimension of the upper protective member 81 and the lower protective member 82 is the width of the housing cover 1a. It is larger than the dimension in the direction and protects the housing cover 1a.

As shown above, the protective member 8 is a plate-shaped member having a predetermined thickness, and has a polygonal outer shape. Therefore, when the torque measuring device 1 is mounted on the mounting surface, the protective member 8 The thick part (one side) is in contact with the mounting surface. Therefore, the torque measuring device 1 can stay in a predetermined position when the protective member 8 comes into contact with the mounting surface.

The protective member 8 is removable and can be attached to the strain generating body 2 so as to sandwich the housing cover 1a from the end in the vertical direction along the axial direction.

The detailed structure of the protective member 8 will be described with reference to FIG.
A mounting hole 8b is formed in a substantially central portion of the main body portion 8a of the protective member 8 so that the inner diameter thereof is substantially the same as the width dimension of the mounting portion of the strain generating body 2. In the protective member 8, the mounting hole 8b is joined to the strain generating body 2. As described above, when the protective member 8 is made removable, it is press-fitted into the strain generating body 2 in the axial direction (Z-axis direction) and attached. Of course, the mounting form is not limited to this press-fitting form, and the protective member 8 is raised by providing a female screw in the vertical direction of the mounting hole 8b and by providing a counterbore in the mounting portion of the strain generating body 2 and mounting the male screw. It is also possible to fix it to the strain body 2. In addition, it is also possible to provide holes in the protective member 8 and the strain generating body 2 and fix them with pins.

The opposite side dimension of the main body 8a of the protective member 8 is set to be larger than the outer dimension (diameter) in the width direction (Y-axis direction) orthogonal to the axial direction (Z-axis direction) of the housing cover 1a. That is, the length of the protective member 8 in the width direction (Y-axis direction) is longer than that of the housing cover 1a.

For example, as shown in FIG. 6, when the protective member 8 has a hexagonal shape, the opposite side dimension A of the two opposing sides is larger than the diameter of the cylindrical housing cover 1a. Therefore, when the housing cover 1a is mounted on the mounting surface by the two protective members 8, the housing cover 1a is in a state where it does not come into contact with the mounting surface. With such a configuration, when the torque measuring device 1 is dropped with the longitudinal direction substantially horizontal, the protective member 8 collides with a flat landing surface such as a floor surface, so that the protective member 8 directly hits the housing cover 1a. No special drop impact force is applied. Therefore, it is possible to protect the housing cover 1a and the electronic device 9 included in the housing cover 1a when dropped from damage.

In the present embodiment, the "opposite side dimension" of the main body portion 8a of the protective member 8 means that in the case of a polygon (for example, a pentagon) surrounded by an odd number of sides, one apex is on the opposite side of the apex. It is the dimension (length) between a certain side, and in the case of a polygon (for example, a hexagon) surrounded by an even number of sides, with respect to one side, the side opposite to that side The dimension (length) between them.

It is preferable that the protective member 8 has the same mounting posture of the upper protective member 81 and the lower protective member 82 with respect to the strain generating body 2.
As for the mounting posture, one side surface of the upper protective member 81 and one side surface of the lower protective member 82 are both parallel to the mounting surface (approximately horizontal plane) on which the tightening tool is mounted. It is preferable to attach it to. As a result, the surface of one side of the upper protective member 81 and the surface of one side of the lower protective member 82 both come into contact with the mounting surface, so that the ratchet handle 100 can be mounted more stably when mounted. Can be done.

As shown in FIG. 6, in the main body 8a of the protective member 8, there is a hole 8c (also referred to as a “lightening portion”) in which a part of the main body 8a is lightened between the outer peripheral edge and the mounting hole 8b. (Referred to as) are provided. The main body 8a of the protective member 8 is a member molded from an arbitrary material, and can be molded using a metal as this material, but is not limited to this, and an elastic body is used. It may be molded.

When the protective member 8 is formed of metal, the provision of the hole 8c improves axial communication. Further, by forming the hole 8c at an appropriate position, the weight can be reduced while maintaining the strength of the protective member 8, so that the weight burden at the time of performing the fastening operation can be reduced. On the other hand, when the protective member 8 is molded using an elastic body, communication in the axial direction is better than when the protective member 8 is molded using a metal, and if the hole 8c is provided, further Axial communication is good.

The shape and number of holes 8c are not limited to the shape shown in FIG. 6, and may be any shape that can reduce the weight while maintaining the strength of the protective member 8.

Further, as shown in FIG. 6, a cover 8d is attached to the outer peripheral surface of the protective member 8 to prevent the tightening object from being damaged by contact with the tightening object during the fastening operation. The cover 8d is formed of an elastic body such as rubber or elastomer so as to prevent damage at the time of contact with the object to be tightened and to absorb the drop impact force at the time of dropping. Since the cover 8d is removable from the protective member 8, it can be replaced if it deteriorates due to aged deterioration. When the protective member 8 is formed of an elastic body, the same effect can be obtained by the protective member 8 itself without attaching the cover 8d. Therefore, the cover 8d is particularly effective when the protective member 8 is made of metal.

As described above, in the torque measuring device 1 according to the present embodiment, the housing cover 1a that includes and protects the mounted electronic device 9 covers a part or all of the outer periphery of the strain generating body 2. A pair of protective members 8 that are attached and prevent an external force from the width direction of the housing cover 1a from being applied to the housing cover 1a are provided on the housing cover 1a along the axial direction of the strain generating body 2. It is installed in the upper and lower positions respectively.

The protective member 8 includes an upper protective member 81 mounted between the handle mounting portion 3 of the strain generating body 2 and one end of the housing cover 1a, and the other end of the tightening portion 4 and the housing cover 1a of the strain generating body 2. It is composed of a lower protective member 82 mounted between the upper protective member 81 and the lower protective member 82, and the opposite side dimensions of the upper protective member 81 and the lower protective member 82 are all larger than the outer dimensions in the width direction orthogonal to the axial direction of the housing cover 1a. Is also set large.

As a result, even if the torque measuring device 1 suddenly falls, the protective member 8 collides with the housing cover 1a before the housing cover 1a collides with a flat surface such as a floor surface, and the falling impact force is applied to the housing cover 1a. Since it is not directly applied, it is possible to prevent the housing cover 1a and the electronic device 9 included in the housing cover 1a from being damaged due to dropping.

Further, since the torque measuring device 1 according to the present embodiment has the cover 8d mounted on the outer peripheral surface of the protective member 8, it is possible to minimize the possibility of damaging any object. Further, by attaching the cover 8d to the protective member 8, it is possible to absorb the drop impact force when the cover 8d is dropped.

[Other]
In the above-described embodiment, the torque measuring device 1 corresponds to an example of the "torque measuring device" described in the claims. The housing cover 1a corresponds to an example of the “housing cover” described in the claims. The strain-causing body 2 corresponds to an example of the “distortion body” described in the claims. The handle mounting portion 3 corresponds to an example of the “mounting portion” described in the claims. The tightening portion 4 corresponds to an example of the “tightening portion” described in the claims. The strain amount detection unit 5 corresponds to an example of the “strain amount detection unit” described in the claims. The communication unit 6 corresponds to an example of the "communication unit" described in the claims. The protective member 8 corresponds to an example of the "protective member" described in the claims. The main body 8a corresponds to an example of the "main body" described in the claims. The hole 8c corresponds to an example of the “hole” described in the claims. The cover 8d corresponds to an example of the "cover" described in the claims. The upper protective member 81 corresponds to an example of the "first protective member" and the "upper protective member" described in the claims. The lower protective member 82 corresponds to an example of the "second protective member" and the "lower protective member" described in the claims. The ratchet handle 100 corresponds to an example of the "tightening tool" described in the claims. The head portion 102 corresponds to an example of the “head portion” described in the claims.

1 Torque measuring device 1a Housing cover 1b Charging terminal 2 Distortion body 2a Distortion generating part 3 Head mounting part 3a Fitting recess 4 Tightening part 4a Fitting convex part 5 Strain amount detection part 6 Communication part 7 Power supply part 8 Protective member 8a Main body 8b Mounting hole 8c Hole 8d Cover 81 Upper protective member 82 Lower protective member 9 Electronic equipment 100 Ratchet handle 101 Handle main body 102 Head part 103 Handle part 104 Drive part L Central axis

Claims (6)

Pillar-shaped strain generator and
A mounting portion provided at one end of the strain-causing body in the axial direction and for mounting a tightening tool,
A tightening portion provided at the other end of the strain generating body in the axial direction and used for tightening the tightening member, and a tightening portion.
A strain amount detection unit that detects the strain amount of the strain-causing body due to the fastening operation of the tightening tool,
A communication unit that transmits information about the distortion amount detected by the distortion amount detection unit to a communication destination,
A housing cover that includes each of the strain amount detection unit and the communication unit provided on the outer shape of the strain-causing body, and
Between the first protective member provided between the mounting portion and the housing cover in the axial direction of the strain generating body and the tightening portion and the housing cover in the axial direction of the strain generating body. A pair of protective members including a second protective member provided, and
With
The pair of protective members
The opposite side dimension is larger than the dimension in the width direction of the housing cover, and the housing cover is protected by the first protective member and the second protective member.
Torque measuring device. The protective member is a pair of members having a polygonal shape.
The torque measuring device according to claim 1. The protective member is molded of metal and has one or more holes.
The torque measuring device according to claim 1 or 2, wherein the information regarding the amount of strain can be transmitted in the axial direction through the hole. The protective member is equipped with a cover made of an elastic body.
The torque measuring device according to claim 3. The protective member is
The upper protective member, which is the first protective member mounted between the upper end of the housing cover and the mounting portion of the strain-causing body,
It is composed of a lower protective member which is the second protective member mounted between the lower end of the housing cover and the tightening portion of the strain-causing body.
With respect to the strain-causing body, one side surface of the upper protective member and one side surface of the lower protective member are both provided so as to be parallel to the mounting surface on which the tightening tool is mounted. ,
The torque measuring device according to claim 4. Pillar-shaped strain generator and
A mounting portion provided at one end of the strain generating body in the axial direction and mounted on a tightening tool, and a mounting portion.
A tightening portion provided at the other end of the strain generating body in the axial direction and used for tightening the tightening member, and a tightening portion.
A strain amount detection unit that electrically detects the strain amount of the strain-causing body due to the fastening operation of the tightening tool,
A communication unit that transmits information about the distortion amount detected by the distortion amount detection unit to a communication destination,
A housing cover that includes each of the strain amount detection unit and the communication unit provided on the outer shape of the strain-causing body, and
A protective member including a first protective member and a second protective member mounted on a torque measuring device.
The first protective member and the second protective member are metal having a polygonal shape in which the opposite side dimension is larger than the dimension in the width direction orthogonal to the axial direction of the housing cover and a hole is partially formed. Consists of boards
The first protective member is provided between the mounting portion and the housing cover in the axial direction of the strain generating body, and the second protective member is provided between the tightening portion and the housing in the axial direction of the strain generating body. Provided between the body cover and the housing cover is protected by the first protective member and the second protective member.
Protective member.