WO2023074891A1

WO2023074891A1 - Electric cylinder device

Info

Publication number: WO2023074891A1
Application number: PCT/JP2022/040611
Authority: WO
Inventors: 真吾小野田
Original assignee: 株式会社アドヴィックス
Priority date: 2021-10-29
Filing date: 2022-10-31
Publication date: 2023-05-04

Abstract

An electric cylinder device 10 comprising a cylinder mechanism 80, an electric motor 50, a linear motion conversion mechanism 70, and a motion transmission mechanism 60. The electric motor 50 and the linear motion conversion mechanism 70 are arranged at such positions that the axis 50a of the electric motor 50 and the axis 70a of the linear motion conversion mechanism 70 are displaced from each other. A motor housing 51 of the electric motor 50 is positioned outside an image obtained by projecting the linear motion conversion mechanism 70 in the radial direction of the linear motion conversion mechanism 70.

Description

Electric cylinder device

The present invention relates to an electric cylinder device that supplies liquid to a supply target.

Patent Document 1 describes an example of an electric cylinder device that supplies brake fluid to a wheel cylinder. In this electric cylinder device, the rotary motion of the electric motor is transmitted to the linear motion conversion mechanism via the motion transmission mechanism. The linear motion conversion mechanism converts input rotational motion into linear motion and transmits it to the piston. When the piston rectilinearly moves, the brake fluid is supplied to the wheel cylinder from the hydraulic chamber in the cylinder. As a result, braking force is applied to the vehicle.

It should be noted that in the electric cylinder device described above, the electric motor is arranged coaxially with the linear motion conversion mechanism, and a planetary gear mechanism is employed as the motion transmission mechanism.

U.S. Pat. No. 1,037,8623

　There is a demand to increase the degree of freedom in designing the electric cylinder device as described above so that mechanisms other than the planetary gear mechanism can be adopted as the motion transmission mechanism.

An electric cylinder device for solving the above-mentioned problems is an electric cylinder device in which a stator and a rotor of an electric motor are accommodated in a motor housing, an output shaft rotating integrally with the rotor protrudes from the motor housing, and rotational motion of the output shaft is achieved. is transmitted to the linear motion conversion mechanism by the motion transmission mechanism, the rotary motion of the rotary part of the linear motion conversion mechanism is converted into the linear motion of the linear motion conversion mechanism, and the piston in the cylinder converts the linear motion conversion It is a device driven by the linear motion of the linear motion part of the mechanism. In this electric cylinder device, the electric motor and the linear motion conversion mechanism are arranged at positions where the axis of the output shaft and the axis of the rotating portion are deviated from each other, and the linear motion conversion mechanism is connected to the linear motion conversion mechanism. The motor housing is located outside the radially projected image.

According to the above configuration, the electric motor and the linear motion conversion mechanism are arranged in such a manner that the axis of the output shaft and the axis of the rotating part are displaced. Therefore, a mechanism other than the planetary gear mechanism, such as a mechanism having a spur gear or a helical gear, can be employed as the motion transmission mechanism. Further, the motor housing is positioned outside the image of the linear motion conversion mechanism projected in the radial direction of the linear motion conversion mechanism. Therefore, the motor housing is not arranged at a position adjacent to the linear motion conversion mechanism in the radial direction of the linear motion conversion mechanism. This makes it possible to arrange various structures at positions adjacent to the linear motion converting mechanism in the radial direction.

Therefore, according to the above configuration, the degree of freedom in designing the electric cylinder device can be improved.

FIG. 1 is a partial cross-sectional view showing an outline of an electric braking device for a vehicle equipped with an electric cylinder device according to the first embodiment. FIG. 2 is a diagram showing the positional relationship between the image of the electric motor and the image of the linear motion conversion mechanism on a virtual plane in the electric cylinder device of FIG. FIG. 3 is a partial cross-sectional view showing an outline of an electric braking device for a vehicle equipped with the electric cylinder device of the second embodiment. FIG. 4 is a partial cross-sectional view showing an outline of an electric braking device for a vehicle equipped with an electric cylinder device according to the third embodiment. FIG. 5 is a schematic diagram showing a part of a modification of the electric cylinder device. FIG. 6 is a schematic diagram showing a part of a modification of the electric cylinder device.

(First embodiment)
A first embodiment of an electric cylinder device will be described below with reference to FIGS. 1 and 2. FIG.
FIG. 1 shows an electric braking device 100 for a vehicle that includes an electric cylinder device 10 of this embodiment. The electric braking device 100 has a wheel cylinder 110 . The electric cylinder device 10 is connected to the wheel cylinder 110 via a fluid passage 120 . That is, the wheel cylinder 110 is the object to which brake fluid (an example of fluid) is supplied by the electric cylinder device 10 . When brake fluid is supplied from the electric cylinder device 10 to the wheel cylinder 110 through the fluid passage 120, the fluid pressure in the wheel cylinder 110 increases. Thereby, a braking force is applied to the wheels of the vehicle.

<Configuration of electric cylinder device>
The electric cylinder device 10 includes a main body case 20 , a substrate housing case 30 and a base member 40 . The body case 20 has a rectangular parallelepiped shape. Of the six side surfaces of the main body case 20, the board housing case 30 is attached to the first main body side surface 21, which is the side surface on the right side in the figure. The pedestal member 40 is arranged on the opposite side of the substrate housing case 30 with the body case 20 interposed therebetween. A base member 40 is attached to the second body side surface 22, which is the side surface on the left side in the drawing, of the six side surfaces of the body case 20. As shown in FIG. That is, the substrate housing case 30 and the base member 40 are arranged so that the main body case 20 is positioned between them.

The body case 20 is formed with a cylinder through hole 23 and a rotary shaft through hole 24 that penetrate the body case 20 . That is, by forming the cylinder through hole 23 in the main body case 20, the first main body side surface 21 is formed with the first opening 23a, and the second main body side surface 22 is formed with the second opening 23b. Further, by forming the rotary shaft through-hole 24 in the main body case 20, a first opening 24a is formed in the first main body side surface 21 and a second opening 24b is formed in the second main body side surface 22. . The first opening 24 a is closed by the board accommodation case 30 , while the first opening 23 a is not closed by the board accommodation case 30 . The second opening 23b and the second opening 24b are closed by the base member 40, respectively.

The substrate housing case 30 is formed with a first housing chamber 31 that communicates with the inside of the rotary shaft through hole 24 and a second housing chamber 32 that is separated from the first housing chamber 31 . A control board 12 for controlling the electric braking device 100 is arranged in the second accommodation chamber 32 . A magnet 11 is arranged in the first housing chamber 31 as a rotation angle detector. A rotation angle sensor 13 for detecting the rotation of the magnet 11 is provided on the control board 12 facing the magnet 11 .

The pedestal member 40 is formed with a pedestal housing chamber 41 communicating with both the inside of the cylinder through hole 23 and the inside of the rotary shaft through hole 24 . Therefore, the cylinder through-hole 23 and the rotating shaft through-hole 24 communicate with each other via the pedestal housing chamber 41 .

The electric cylinder device 10 includes an electric motor 50 , a motion transmission mechanism 60 , a linear motion converting mechanism 70 and a cylinder mechanism 80 .
<Cylinder mechanism>
The cylinder mechanism 80 is fixed to the body case 20 . Specifically, the cylinder mechanism 80 is inserted through the cylinder through-hole 23 of the main body case 20 . The cylinder mechanism 80 protrudes outside the main body case 20 from the first main body side surface 21 .

The cylinder mechanism 80 has a cylinder 81 supported by the body case 20 and a piston 82 arranged inside the cylinder 81 . The cylinder 81 has a cylindrical portion 811 and a bottom wall 812 closing one end of the cylindrical portion 811 . Inside the cylinder 81, a hydraulic pressure chamber 83 for storing brake fluid is defined by a bottom wall 812 and a piston 82. As shown in FIG. The hydraulic pressure chamber 83 is provided with a spring 84 that biases the piston 82 in the backward direction Z2, which is the direction in which the volume of the hydraulic pressure chamber 83 is expanded.

The piston 82 rectilinearly moves within the cylinder 81 in the backward direction Z2 and in the forward direction Z1, which is the reverse direction of the backward direction Z2. When the piston 82 linearly moves in the forward direction Z1, the piston 82 approaches the bottom wall 812, so the volume of the hydraulic pressure chamber 83 is reduced. As a result, the brake fluid in hydraulic pressure chamber 83 is delivered to wheel cylinder 110 . On the other hand, when the piston 82 rectilinearly moves in the backward direction Z2, the piston 82 separates from the bottom wall 812, so the volume of the hydraulic pressure chamber 83 increases. As a result, the hydraulic pressure within the wheel cylinder 110 is reduced, and the brake fluid is returned to the hydraulic pressure chamber 83 .

<Linear motion conversion mechanism>
The direct-acting conversion mechanism 70 is supported by the body case 20 via a cylinder 81 . The linear motion conversion mechanism 70 converts the rotary motion transmitted from the electric motor 50 into linear motion and transmits the linear motion to the piston 82 . The linear motion conversion mechanism 70 is, for example, a ball screw mechanism or a feed screw mechanism. The linear motion conversion mechanism 70 has a rotary member 71 that rotates in conjunction with the rotation of the electric motor 50 and a linear motion member 72 that linearly moves in a direction corresponding to the rotation direction of the rotary member 71 . In this embodiment, a nut is used as the rotating member 71 , and a screw disposed inside the nut is used as the linear motion member 72 . The rotary member 71 corresponds to the "rotating portion of the linear motion conversion mechanism", and the linear motion member 72 corresponds to the "linear motion portion of the linear motion conversion mechanism".

The linear motion member 72 can move back and forth in the direction along the axis 70 a of the linear motion converting mechanism 70 . In this embodiment, one of the directions along the axis 70a is the forward direction Z1 and the other is the backward direction Z2. When the linear motion member 72 moves in the forward direction Z1, the linear motion member 72 pushes the piston 82 in the forward direction Z1. On the other hand, when the linear motion member 72 moves in the backward direction Z2, the linear motion member 72 pulls the piston 82 in the backward direction Z2, and is further assisted by the urging force of the spring 84 and the hydraulic pressure in the hydraulic pressure chamber 83 in the backward direction Z2. The piston 82 moves linearly.

<Electric motor>
The electric motor 50 comprises a motor housing 51 , a stator 52 , a rotor 53 and an output shaft 54 . The motor housing 51 is fixed to the base member 40 . The stator 52 and rotor 53 are housed within the motor housing 51 . The output shaft 54 protrudes outside from inside the motor housing 51 . That is, the distal end portion 541 of the output shaft 54 is positioned within the pedestal housing chamber 41 of the pedestal member 40 .

The motor housing 51 is arranged on the opposite side of the main body case 20 with the base member 40 interposed therebetween in the direction along the axis 70 a of the linear motion converting mechanism 70 . That is, the motor housing 51 is located in the retreating direction Z2 with respect to the linear motion converting mechanism 70 . The end of the linear motion conversion mechanism 70 in the backward direction Z2 (the left end in the drawing) is defined as a first end, and the end of the linear motion conversion mechanism 70 in the forward direction Z1 (the right end in the drawing) is defined as a second end. At this time, the tip portion 541 of the output shaft 54 is located in the forward direction Z1 from the first end of the linear motion conversion mechanism 70 and in the backward direction Z2 from the second end.

In other words, it is assumed that the linear motion conversion mechanism 70 and the electric motor 50 are projected in the extending direction of the virtual straight line S1 on the virtual plane HB orthogonal to the virtual straight line S1 extending in the radial direction of the linear motion conversion mechanism 70 . At this time, the image of the motor housing 51 of the electric motor 50 does not overlap the image of the linear motion converting mechanism 70 on the virtual plane HB. On the other hand, on the virtual plane HB, the image of the output shaft 54 of the electric motor 50 overlaps the image of the linear motion converting mechanism 70 .

When the virtual straight line S1 is rotated 360° around the axis 70a of the linear motion converting mechanism 70, the virtual plane HB rotates 360° around the axis 70a. In this case, the image of the motor housing 51 does not overlap the image of the linear motion conversion mechanism 70 regardless of the position in the circumferential direction of the imaginary straight line S1. Therefore, it can be said that the motor housing 51 is arranged outside the image of the linear motion conversion mechanism 70 projected in the radial direction of the linear motion conversion mechanism 70 .

Also, as shown in FIG. 1, the electric motor 50 is not arranged coaxially with the linear motion conversion mechanism 70 . In other words, the electric motor 50 and the linear motion conversion mechanism 70 are positioned at a position where the axis 50a of the electric motor 50, which is the axis of the output shaft 54, and the axis 70a of the linear motion conversion mechanism 70, which is the axis of the rotating portion, are deviated from each other. are placed. In the present embodiment, the output shaft 54 is parallel to the axis 70a of the linear motion conversion mechanism 70 and positioned outside the linear motion conversion mechanism 70 in the radial direction of the linear motion conversion mechanism 70 .

Here, it is assumed that the electric motor 50 and the linear motion conversion mechanism 70 are projected onto a white arrow A1 pointing in the backward direction Z2 on the virtual plane HA perpendicular to the axis 70a of the linear motion conversion mechanism 70. FIG. 2 schematically shows a motor image P50, which is an image of the electric motor 50 projected onto the virtual plane HA, and a mechanism image P70, which is an image of the linear motion conversion mechanism 70. As shown in FIG. As shown in FIG. 2, a portion of the motor image P50 overlaps the mechanism image P70 on the virtual plane HA.

It should be noted that the radius of the motor housing 51 is defined as motor radius L50, and the radius of linear motion conversion mechanism 70 is defined as mechanism radius L70. A straight line distance from the axis 50a of the electric motor 50 to the axis 70a of the linear motion conversion mechanism 70 on the virtual plane HA is defined as an inter-axis distance L1. At this time, the center distance L1 is shorter than the sum of the motor radius L50 and the mechanism radius L70.

Since the retreating direction Z2 is one of the extending directions of the output shaft 54, it can be said that the retreating direction Z2 is the direction of the output shaft 54. Therefore, in FIG. 2, the image of the electric motor 50 when the electric motor 50 is projected in the direction of the output shaft 54 with respect to the linear motion converting mechanism 70 is illustrated as the motor image P50. In other words, in the present embodiment, the electric motor 50 is arranged so that a portion of the projected image of the electric motor 50 overlaps the linear motion converting mechanism 70 .

<Movement transmission mechanism>
As shown in FIG. 1 , the motion transmission mechanism 60 is arranged in the pedestal housing chamber 41 . The motion transmission mechanism 60 transmits the rotary motion of the electric motor 50 to the linear motion conversion mechanism 70 . Specifically, the motion transmission mechanism 60 decelerates the rotational motion of the electric motor 50 and transmits it to the linear motion conversion mechanism 70 . The motion transmission mechanism 60 has a drive gear 61 and a first driven gear 62 . In this embodiment, the first driven gear 62 meshes with the driving gear 61 . Therefore, the first driven gear 62 rotates according to the rotation of the drive gear 61 .

The drive gear 61 is provided at the tip portion 541 of the output shaft 54 of the electric motor 50 . The first driven gear 62 is connected to a linear motion conversion mechanism 70 . That is, the first driven gear 62 is fixed to the rotating member 71 of the linear motion converting mechanism 70 . Specifically, the first driven gear 62 is arranged coaxially with the rotating member 71 and arranged radially outside the rotating member 71 . Thereby, the rotary motion of the electric motor 50 is transmitted to the linear motion conversion mechanism 70 via the driving gear 61 and the first driven gear 62 .

In this embodiment, the output shaft 54 of the electric motor 50 is parallel to the axis 70a of the linear motion conversion mechanism 70 as described above. Therefore, spur gears are employed as the driving gear 61 and the first driven gear 62 .

Also, the motion transmission mechanism 60 has a second driven gear 63 and a rotating shaft 64 . In this embodiment, the second driven gear 63 meshes with the drive gear 61 . Therefore, the second driven gear 63 rotates according to the rotation of the drive gear 61 .

The rotating shaft 64 rotates integrally with the second driven gear 63 . In this embodiment, the rotating shaft 64 is arranged coaxially with the second driven gear 63 . As such, the rotation axis 64 is parallel to the output shaft 54 of the electric motor 50 . The rotating shaft 64 is inserted through the rotating shaft through-hole 24 of the main body case 20 and extends to the first housing chamber 31 . The rotating shaft 64 is rotatably supported by the main body case 20 via a plurality of bearings 66 . A magnet 11 is attached to a portion of the rotating shaft 64 that is located in the first storage chamber 31 .

A magnet 11 is provided in the first storage chamber 31, and a rotation angle sensor 13 is arranged on the opposite side of the magnet 11 across the partition wall. Therefore, the rotation angle sensor 13 detects the rotation angle and rotation speed of the rotating shaft 64 . That is, the rotation angle sensor 13 outputs a signal corresponding to the rotation of the rotating shaft 64 to the control board 12 .

<Actions and effects of the present embodiment>
In the electric cylinder device 10, the electric motor 50 is not arranged coaxially with the linear motion converting mechanism 70 as shown in FIG. That is, the electric motor 50 and the linear motion conversion mechanism 70 are arranged in such a manner that the axis 50a of the electric motor 50 and the axis 70a of the linear motion conversion mechanism 70 are deviated from each other. Therefore, as the motion transmission mechanism 60, a mechanism other than the planetary gear mechanism, that is, a mechanism having a plurality of spur gears can be employed.

Also, the motor housing 51 of the electric motor 50 is arranged in the backward direction Z2 relative to the linear motion conversion mechanism 70 . That is, the motor housing 51 is not arranged at a position adjacent to the linear motion conversion mechanism 70 in the radial direction of the linear motion conversion mechanism 70 . Therefore, various structures can be arranged at positions adjacent to the linear motion conversion mechanism 70 in the radial direction.

Therefore, according to this embodiment, the degree of freedom in designing the electric cylinder device 10 can be increased.
In the electric cylinder device 10, the motor housing 51 is arranged in the backward direction Z2 relative to the linear motion conversion mechanism 70, but the output shaft 54 is located at the first end and the second end in the direction along the axis 70a of the linear motion conversion mechanism 70. placed between the ends. As a result, the degree of freedom in designing the electric cylinder device 10 can be increased while suppressing an increase in the size of the electric cylinder device 10 in the direction along the axis 70a.

In the electric cylinder device 10, since the output shaft 54 of the electric motor 50 is parallel to the axis 70a of the linear motion conversion mechanism 70, spur gears are employed as the drive gear 61 and the first driven gear 62 of the motion transmission mechanism 60. there is A drive gear 61 and a first driven gear 62 are arranged between a first end and a second end of the linear motion converting mechanism 70 in the direction along the axis 70 a of the linear motion converting mechanism 70 . Accordingly, it is possible to suppress an increase in the size of the electric cylinder device 10 in the direction along the axis 70a.

Here, consider the case where the electric motor 50 is arranged at a position distant from the linear motion converting mechanism 70 . In this case, if the motion transmission mechanism is not provided with a relay gear that meshes with both the drive gear provided on the output shaft 54 of the electric motor 50 and the first driven gear provided on the linear motion converting mechanism 70, the electric motor 50 will not rotate. There is a possibility that motion cannot be transmitted to the linear motion converting mechanism 70 .

In this regard, in the electric cylinder device 10, the electric motor 50 is arranged so that a part of the motor image P50 overlaps the mechanism image P70 on the virtual plane HA as shown in FIG. That is, the electric motor 50 is arranged relatively close to the linear motion converting mechanism 70 . Therefore, since the drive gear 61 can mesh with the first driven gear 62, there is no need to provide a relay gear. Therefore, an increase in the number of parts of the motion transmission mechanism 60 can be suppressed.

In the case of an electric motor with a built-in rotation angle sensor, the dimension of the electric motor in the direction along the axis 50a is larger than that of an electric motor without a built-in rotation angle sensor. The electric cylinder device 10 can detect the rotation angle and rotation speed of the electric motor 50 based on the detection value of the rotation angle sensor 13 . Therefore, it is not necessary to use the electric motor 50 in which the rotation angle sensor is built in the motor housing 51 . Therefore, it is possible to suppress an increase in the size of the electric cylinder device 10 in the direction along the axis 70 a of the linear motion conversion mechanism 70 .

In addition, in the electric cylinder device 10, by providing the second driven gear 63 that meshes with the drive gear 61, the power transmission path of the electric motor 50 is branched into two. The rotation angle sensor 13 detects the rotation of the rotating shaft 64 arranged on a path different from the path for transmitting the motion to the direct-acting conversion mechanism 70 . By providing a path different from the path for transmitting the rotational motion to the linear motion conversion mechanism 70 in this manner, the degree of freedom in arranging the magnet 11 and the rotation angle sensor 13 in the electric cylinder device 10 can be increased. For example, as shown in FIG. 1, the magnet 11 can be arranged near the rotation angle sensor 13 provided on the control board 12 .

In the electric cylinder device 10, there is a relatively large space near the control board 12. Therefore, a magnetic sensor can be employed as the rotation angle sensor 13 in the electric cylinder device 10 . As a result, compared with the case where a Hall sensor is employed as the rotation angle sensor 13, the detection accuracy of the rotation angle and rotation speed can be increased.

(Second embodiment)
A second embodiment of the electric cylinder device will be described with reference to FIG. In the following description, the parts that are different from the first embodiment will be mainly described, and the same reference numerals will be given to the same member configurations as in the first embodiment, and redundant description will be omitted.

FIG. 3 illustrates an electric braking device 100 for a vehicle that includes an electric cylinder device 10A. The electric cylinder device 10A includes a substrate housing case 30, a main body case 20A, a base member 40A, and a motor housing 51. As shown in FIG. The motor housing 51 has a housing main body 511 that accommodates the stator 52 and the rotor 53 and a flange portion 515 . The housing body 511 has a cylindrical portion 512 and a lid portion 513 that closes the opening of the cylindrical portion 512 in the backward direction Z2. The flange portion 515 extends outward in the radial direction centered on the output shaft 54 from the end of the cylindrical portion 512 in the forward direction Z1. A flange portion 515 is fastened to the base member 40A. Thereby, the motor housing 51 is attached to the base member 40A.

The base member 40A is arranged between the main body case 20A and the motor housing 51. That is, the pedestal member 40A is attached to the main body case 20A so as to be sandwiched between the main body case 20A and the motor housing 51. As shown in FIG. A motion transmission mechanism 60 is housed in the pedestal housing chamber 41 of the pedestal member 40A. The outer surface 401 of the base member 40A is located outside the rotor 53 in the radial direction about the output shaft 54 of the electric motor 50 . More specifically, the outer surface 401 of the base member 40A is located outside the outer peripheral surface of the cylindrical portion 512 of the motor housing 51 in the radial direction about the output shaft 54 .

The electric motor 50 has power pins 56 . Power pins 56 are electrically connected to coils wound around stator 52 . The power pin 56 protrudes from inside the motor housing 51 in the forward direction Z1. In other words, the tip of the power pin 56 is positioned within the pedestal housing chamber 41 .

A relay circuit board 14 is provided in the pedestal housing chamber 41 . The relay circuit board 14 is arranged between the motion transmission mechanism 60 and the peripheral wall of the base member 40A. A portion of the relay circuit board 14 is located outside the housing main body 511 in the radial direction about the output shaft 54 . A portion of the relay circuit board 14 located outside the stator 52 in the radial direction about the output shaft 54 is referred to as an outer portion. At this time, the signal line 15 electrically connected to the control board 12 is electrically connected to the outer portion. That is, in the pedestal housing chamber 41 , the signal line 15 is located outside the stator 52 in the radial direction about the output shaft 54 . Specifically, the signal line 15 is located outside the housing body 511 in the radial direction about the output shaft 54 .

The power pins 56 of the electric motor 50 are electrically connected to the terminals of the relay circuit board 14 . In the relay circuit board 14, the power pins 56 and the signal lines 15 are electrically connected. The signal line 15 passes through the base member 40A and the body case 20A. A first end of the signal line 15 is electrically connected to the control board 12 , while a second end of the signal line 15 is electrically connected to the relay circuit board 14 . Therefore, power can be supplied from the control board 12 to the electric motor 50 via the signal line 15 .

<Actions and effects of the present embodiment>
In this embodiment, the following effects can be obtained in addition to the same functions and effects as those of the first embodiment.

A signal line electrically connecting the electric motor 50 and the control board 12 can be arranged outside the stator 52 in the radial direction about the output shaft 54 in the pedestal housing chamber 41 . As a result, it is not necessary to employ the electric motor having the large radial dimension as the electric motor 50 . Therefore, it is possible to suppress an increase in the size of the electric cylinder device 10A.

(Third embodiment)
A third embodiment of the electric cylinder device will be described with reference to FIG. In the following description, the parts that are different from the first embodiment will be mainly described, and the same reference numerals will be given to the same member configurations as in the first and second embodiments, and redundant description will be omitted. and

FIG. 4 illustrates an electric braking device 100 for a vehicle that includes an electric cylinder device 10B. The electric cylinder device 10B includes a substrate housing case 30B, a main body case 20B, a base member 40B, and a motor housing 51. As shown in FIG. The motor housing 51 has a housing main body 511 that accommodates the stator 52 and the rotor 53 and a flange portion 515 . A collar portion 515 is fastened to the base member 40B.

The body case 20B is formed with a cylinder through-hole 23 and a rotary shaft through-hole 24B that penetrate the body case 20B. In the present embodiment, the rotary shaft through hole 24B is located outside the stator 52 of the electric motor 50 in the radial direction about the output shaft 54 . Specifically, the rotary shaft through hole 24</b>B is located outside the housing body 511 in the radial direction centering on the output shaft 54 .

The substrate housing case 30B is formed with a first housing chamber 31B that communicates with the inside of the rotary shaft through hole 24B, and a second housing chamber 32 that is separated from the first housing chamber 31B. A magnet 11 as a rotation angle detector is arranged in the first storage chamber 31B. A control board 12 is arranged in the second storage chamber 32 .

The base member 40B is arranged between the main body case 20B and the motor housing 51. That is, the pedestal member 40B is attached to the main body case 20B so as to be sandwiched between the main body case 20B and the motor housing 51. As shown in FIG. A motion transmission mechanism 60 is housed in the pedestal housing chamber 41 of the pedestal member 40B. The outer surface 401 of the base member 40B is located outside the rotor 53 in the radial direction about the output shaft 54 of the electric motor 50 . More specifically, the outer surface 401 of the base member 40B is located outside the outer peripheral surface of the cylindrical portion 512 of the motor housing 51 in the radial direction about the output shaft 54 .

The electric cylinder device 10</b>B includes a first relay gear 91 and a second relay gear 95 arranged in the pedestal housing chamber 41 and a rotating shaft 64 .
The first intermediate gear 91 is attached to the output shaft 54 . Also, the first relay gear 91 is arranged coaxially with the output shaft 54 . Therefore, the first intermediate gear 91 rotates integrally with the output shaft 54 and the driving gear 61 . The first intermediate gear 91 has a disc portion 92 and a ring-shaped gear portion 93 fixed to the disc portion 92 . A through hole into which the output shaft 54 is fitted is formed in the center of the disk portion. A motion transmission mechanism 60 is arranged inside the gear portion 93 . Note that the gear portion 93 is an external gear.

The second intermediate gear 95 is arranged outside the housing main body 511 in the radial direction about the output shaft 54 . The second intermediate gear 95 meshes with the gear portion 93 . Therefore, when the output shaft 54 rotates, the second intermediate gear 95 rotates in synchronization with the first intermediate gear 91 and the drive gear 61 .

The rotating shaft 64 rotates integrally with the second intermediate gear 95 . In this embodiment, the rotating shaft 64 is arranged coaxially with the second intermediate gear 95 . Therefore, the rotating shaft 64 is connected to the output shaft 54 of the electric motor 50 inside the base member 40B so as to be able to transmit power. Furthermore, the rotation axis 64 is parallel to the output shaft 54 . That is, the rotating shaft 64 extends along the axis of the output shaft 54 , that is, along the axis 50 a of the electric motor 50 . The rotating shaft 64 is inserted through the rotating shaft through-hole 24B of the main body case 20B and extends to the first housing chamber 31B. The rotating shaft 64 is rotatably supported by the main body case 20B via a plurality of bearings 66 . A magnet 11 is attached to a portion of the rotary shaft 64 located in the first storage chamber 31B. That is, the second relay gear 95 is attached to the first end 641 positioned inside the pedestal housing chamber 41 among both ends of the rotating shaft 64, and the second end positioned inside the first housing chamber 31B is mounted. A magnet 11 is attached to 642 . It can be said that the second end portion 642 is arranged on the outside of the base member 40B on the main body case 20B side.

The power transmission path of the electric motor 50 is branched into two by arranging the first relay gear 91 in the pedestal housing chamber 41 . The rotation angle sensor 13 detects the rotation of the rotating shaft 64 arranged on a path different from the path for transmitting the motion to the direct-acting conversion mechanism 70 . This eliminates the need to use an electric motor with a built-in rotation angle sensor as the electric motor 50 .

(Change example)
The multiple embodiments described above can be implemented with the following modifications. The multiple embodiments described above and the following modified examples can be implemented in combination with each other within a technically consistent range.

- In the first embodiment, as shown in FIG. 5, the second driven gear 63 may be arranged so as to mesh with the first driven gear 62 instead of the drive gear 61.
- A rotation angle sensor may be arranged so as to detect the rotation angle and rotation speed of the second driven gear 63 . In this case, the rotating shaft 64 can be omitted.

· The rotation angle sensor 13 may employ a sensor other than a magnetic sensor as long as it can detect the rotation angle and rotation speed. For example, a Hall sensor may be employed as the rotation angle sensor 13 .

· In the first and second embodiments, the electric motor 50 may include a rotation angle sensor. In this case, since the rotation angle sensor 13 does not have to be provided, the motion transmission mechanism 60 can omit the second driven gear 63 and the rotating shaft 64 .

If the electric motor 50 is arranged so that a portion of the motor image P50 overlaps the mechanism image P70 on the virtual plane HA, the inter-axis distance L1 is shorter than both the motor radius L50 and the mechanism radius L70. may

· If the electric motor 50 is not arranged coaxially with the linear motion conversion mechanism 70, the electric motor 50 may be arranged so that the motor image P50 does not overlap the mechanism image P70 on the virtual plane HA. In this case, the electric motor 50 is arranged relatively far from the linear motion conversion mechanism 70 . Therefore, the motion transmission mechanism may have a configuration in which at least one intermediate gear is arranged in the power transmission path between the drive gear 61 and the first driven gear 62 .

· In the above embodiment, the electric motor 50 is arranged so that the output shaft 54 is parallel to the axis 70a of the linear motion conversion mechanism 70, but this is not the only option. For example, if the output shaft 54 is substantially parallel to the axis 70a of the linear motion converting mechanism 70, the output shaft 54 may be inclined with respect to the axis 70a.

- The electric motor 50 may be arranged so that the output shaft 54 in addition to the motor housing 51 is located in the backward direction Z2 relative to the linear motion conversion mechanism 70 .
・The electric cylinder device is configured so that the output shaft 54 is orthogonal to the axis 70a of the linear motion conversion mechanism 70, or the output shaft 54 is substantially orthogonal to the axis 70a of the linear motion conversion mechanism 70, as shown in FIG. , the electric motor 50 may be arranged. In the case of such a configuration, the electric motor 50 can be arranged in the backward direction Z2 with respect to the linear motion conversion mechanism 70 .

· As long as the motion transmission mechanism 60 has a plurality of gears that mesh with each other, at least one of the plurality of gears need not be a spur gear. As the driving gear 61 and the first driven gear 62, for example, bevel gears may be employed as shown in FIG. 6, or helical gears may be employed.

As long as the motion transmission mechanism can transmit the rotary motion of the electric motor 50 to the linear motion conversion mechanism 70, the motion transmission mechanism may use a belt or a chain to transmit power.
- The cylinder mechanism 80 may have a configuration in which the spring 84 is omitted.

・If the

main body cases

20, 20A, 20B have a first main body side surface 21 to which the

substrate housing cases

30, 30B are attached and a second main body side surface 22 to which the

base members

40, 40A, 40B are attached, they are other than rectangular parallelepipeds. Other shapes may be used.

If the motor housing 51 can be arranged outside the image of the linear motion conversion mechanism 70 projected in the radial direction of the linear motion conversion mechanism 70, the motor housing 51 can be arranged at a position different from the position shown in FIG. good too. For example, the motor housing 51 may be arranged in the forward direction Z1 from the linear motion conversion mechanism 70 .

- In 2nd Embodiment and 3rd Embodiment, you may employ|adopt a planetary gear mechanism as a motion transmission mechanism.
- The electric cylinder device may be embodied as a device to which liquid is to be supplied, other than the wheel cylinder 110 .

Claims

A stator and a rotor of an electric motor are housed in a motor housing, an output shaft that rotates together with the rotor protrudes from the motor housing, and rotational motion of the output shaft is transmitted to a linear motion conversion mechanism by a motion transmission mechanism. , the rotary motion of the rotary portion of the linear motion conversion mechanism is converted into the linear motion of the linear motion portion of the linear motion conversion mechanism, and the piston in the cylinder is driven by the linear motion of the linear motion portion of the linear motion conversion mechanism. An electric cylinder device that
The electric motor and the linear motion converting mechanism are arranged at positions where the axis of the output shaft and the axis of the rotating part are shifted, and an image of the linear motion converting mechanism projected in the radial direction of the linear motion converting mechanism. The motor housing is located outside the electric cylinder device.
The electric motor is arranged such that when the electric motor is projected onto the linear motion conversion mechanism in the direction of the output shaft, the linear motion conversion mechanism partially overlaps the projected image of the electric motor. The electric cylinder device according to claim 1.
The motion transmission mechanism is
a driving gear provided on the output shaft;
a first driven gear that is connected to the rotating portion and rotates according to the rotation of the driving gear;
a second driven gear that meshes with the drive gear or the first driven gear and rotates according to the rotation of the drive gear;
a rotating shaft that rotates integrally with the second driven gear;
The electric cylinder device according to claim 1 or 2, further comprising a rotation angle detection section that detects the rotation angle of the rotating shaft.
a body case that supports the linear motion conversion mechanism;
a pedestal member disposed between the body case and the motor housing and housing the motion transmission mechanism therein;
a control board arranged on the opposite side of the base member across the main body case,
the outer surface of the base member is located outside the stator in a radial direction about the output shaft,
A signal line of the electric motor is electrically connected to the control board through the inside of the base member and the inside of the main body case,
The electric cylinder device according to claim 1, wherein the signal line is arranged outside the stator in a radial direction about the output shaft in the base member.
a body case that supports the linear motion conversion mechanism;
a pedestal member disposed between the body case and the motor housing and housing the motion transmission mechanism therein;
a rotating shaft that extends along the direction in which the output shaft extends, is connected to the output shaft inside the base member, and rotates in synchronization with the rotation of the output shaft;
a rotation angle detection unit that detects the rotation angle of the rotation shaft,
the outer surface of the base member is located outside the stator in a radial direction about the output shaft,
a first end of the rotating shaft is positioned outside the stator in a radial direction about the output shaft inside the base member;
2. The electric cylinder according to claim 1, wherein a second end of said rotating shaft is disposed outside said main body case side of said base member, and said rotation angle detector is attached to said second end. Device.