KR20210016180A - Spindle locking apparatus, electronic tool and actuator for vehicle using the same - Google Patents

Abstract

The present invention relates to a spindle locking apparatus, an electric tool, and an actuator for a vehicle using the same. The present invention comprises: a lock ring (20) installed inside a housing and having an installation space (25) therein; a spindle (10) of which at least a part is positioned in the installation space (25), wherein a cam driver (15) is arranged on one side and a driving device is connected to the other side; a carrier (30) received in the installation space (25) and having a cam groove (35) engaged with the cam driver (15) to transmit the rotational force of a motor to the spindle (10) while rotating in a connected state to the motor; and a locking assembly (50). The locking assembly (50) is received inside the installation space (25) to make the spindle in a locked state so that the spindle cannot be rotated by external force applied to the driving device, and a plurality of locking units (80) revolving therein are installed in the installation space (25) to surround the cam driver (15) in a state of being received in a retainer (70).

Description

Spindle locking apparatus, power tool and actuator for vehicle using the same

The present invention relates to a spindle locking device, and more particularly, to a spindle locking device that allows the spindle to remain firmly fixed without a gap when an external force other than the motor power is applied.

Actuators or power tools operate with the rotational force of the motor. However, it needs to be configured not to be operated (rotated) by external force arbitrarily applied from the outside, not by rotation by the motor. For example, a footrest that automatically protrudes/receives is used in automobiles, but when the occupant supports the footrest, the footrest must not be pushed back. For this purpose, only the operation by the actuator that transmits power to the scaffold is possible, and on the contrary, a locking device is applied inside so that the scaffold is not operated by external force.

In addition, power tools that use rotational force such as grinders and drills need to be replaced when the disk or bit is worn.However, if the spindle (drive shaft) rotates during the replacement process, it is not easy to tighten the wheel nut, so it is necessary to fix the spindle first. Do.

In this way, in order to prevent the spindle of an actuator or a power tool from rotating arbitrarily, a structure in which the spindle is automatically locked is also used in recent years. The rotational force transmitted from the motor rotates the spindle, but on the contrary, when the user applies an external force, the spindle is locked and prevents rotation. To this end, there is a locking roller inside the spindle locking device, and when torque is applied to the disk from outside, not the motor, the locking roller is caught inside the locking device to prevent rotation of the spindle.

However, in the conventional spindle locking device, it has been cumbersome to install the locking roller inside the spindle locking device. This is because not only the number of locking rollers is large, but also the locking rollers have a cylindrical shape that can be easily rolled. For example, in the installation process, the locking roller is easily removed or the correct installation position is often not found, resulting in poor workability.

In addition, a locking roller used in a conventional spindle locking device has a cylindrical shape that extends to one side and is installed in a manner that is simply inserted into an empty space between the inner surface of the lock ring (housing) and the lock cam inside the lock ring. Therefore, in the course of operation, the locking roller may be easily inclined to one side, and the locking function may not be properly implemented.

In addition, when the locking roller is worn, the diameter of the locking roller decreases, so there is a problem in that the locking roller cannot be locked even when it reaches the initially set locking position. If a spring is used, the locking roller can be pushed in the direction of the locked position, so even if the locking roller is worn to some extent, the locking function can be implemented, but in this case, there is a problem that the number of parts and the number of assembly work are increased. In particular, since the spring must be installed in accordance with the position of each locking roller, the assembling property is greatly inferior.

Republic of Korea Patent Publication No. 10-2005-23709 Republic of Korea Patent Publication 10-2013-0071654

The present invention is to solve the problems of the prior art as described above, and an object of the present invention is to allow a plurality of locking means (locking rollers) to be first assembled in a spindle locking device in a state accommodated in a retainer.

Another object of the present invention is to make it possible to stably perform the locking function even when the locking means is worn.

According to the features of the present invention for achieving the above object, the present invention provides a lock ring installed inside a housing and having an installation space inside, at least a part of which is located in the installation space and has a cam driver on one side and the other side A spindle to which a driving device is connected, a carrier having a cam groove at the center that is accommodated in the installation space and engaged with the cam driver to transmit the rotational force of the motor to the spindle while rotating and connected to the motor, and an inside of the installation space The spindle is locked so that the spindle does not rotate by an external force acting on the driving device, but a plurality of locking means revolving inside a locking assembly installed in the installation space to surround the cam driver in a state accommodated in a retainer. Include.

A clearance exists along the relative rotation path at the connection portion between the carrier and the cam driver, so that the carrier rotates independently by a predetermined angle to release the locked state by the locking assembly, and then rotates together with the cam driver.

The locking assembly is installed between the outer surface of the lock cam and the inner surface of the installation space to surround the lock cam and a lock cam that creates an operating space between the inner surface of the installation space on the outer surface and rotates together by being coupled to the cam driver. A plurality of storage spaces arranged along a retainer extending in the longitudinal direction of the spindle, and a cylindrical shape accommodated in the storage space of the retainer, and revolves together with the retainer in the operating space according to the rotation of the lock cam. It includes a plurality of locking means that can be selectively pinched on one side to create a locked state.

The retainer has a cylindrical shape, and an inner space in which the lock cam is accommodated is created in the center, and a plurality of storage spaces are arranged along the circumferential direction, and one of the storage spaces is opened along the longitudinal direction of the spindle to insert the locking means. , The opposite side of the storage space is blocked to support the locking means.

The carrier has a cam groove, and the cam driver protrudes a cam protrusion inserted into the cam groove, and a plane section is formed on at least a portion of the inner surface of the cam groove and the outer surface of the cam protrusion facing each other, and the relative rotation between the carrier and the cam driver There is a play along the path so that the carrier can rotate independently by a predetermined angle with respect to the cam driver.

The cam protrusion of the cam driver has a regular polygonal shape, and in a locked state, the inner surface of the cam groove is in close contact with the center of each side of the cam protrusion, but is spaced apart from the edge of the cam protrusion, so that a predetermined angle can be rotated.

The operating space is composed of a relatively wide release space and a relatively narrow locking space located on both sides of the release space, and the diameter of the cross section of the locking means is smaller than the width of the release space and equal to or greater than the width of the locking space. .

In the carrier, a release protrusion protrudes in the direction of the operating space, and when the carrier rotates independently of the cam driver, the retainer or locking means is pushed to create an unlocked state, or a driving means is installed between the carrier and the retainer. When is rotated independently of the cam driver, the retainer or the locking means is rotated to create an unlocked state.

The angle (α) at which the carrier can rotate independently of the cam driver is a virtual line extending the center of the release space from the center of the locking assembly and the center of the locking means locked from the center of the locking assembly. It is equal to or greater than the angle α1 between the imaginary lines.

According to another feature of the present invention, the present invention provides a lock ring installed inside a housing and having an installation space therein, a spindle at least partially located in the installation space, a cam driver on one side and a driving device connected to the opposite side, An external force accommodated in the installation space and connected to the motor to rotate and transmit the rotational force of the motor to the spindle, having a cam groove at the center thereof, and an external force received inside the installation space and acting on the driving device. By making a locked state so that the spindle does not rotate, a plurality of locking means revolving inside a locking assembly installed in the installation space so as to surround the cam driver while being accommodated in a retainer, and between the carrier and the retainer It is installed and includes a driving means that rotates with the carrier and rotates the locking assembly when the carrier rotates independently of the cam driver to create an unlocked or locked state.

The driving means is a disk shape having a through hole through which the cam driver passes at the center, and the driving means is connected to the retainer and at the same time, and is connected to the motor to lock while rotating with the carrier when the carrier rotates independently of the cam driver. Make the assembly unlocked or locked.

The drive means has a connection hole for connection to the motor, and the drive means has a damping hole into which a connection protrusion protruding from the retainer is fitted, and the connection hole and the damping hole are plural along the circumferential direction of the drive means. There is a dog.

The driving means is made of a material capable of elastic deformation.

When the locking assembly is released, the carrier engages with the cam driver of the spindle and rotates together, but when a stop signal is input, the carrier and the driving means rotate in the opposite direction independently of the cam driver to lock the locking assembly, and the The difference between the angle α at which the carrier and the driving means independently rotate and the angle α1 at which the locking assembly rotates may be absorbed by the elastic material driving means and damped.

The spindle locking device according to the present invention, as shown above, and the power tool and vehicle actuator to which the same has the following effects.

In the present invention, a plurality of locking rollers (locking means) performing a locking function are first assembled in a spindle locking device in a state accommodated in a retainer. Since the locking rollers are round and have a large number of rollers, the assembling property may be inferior. Since they are installed after pre-assembled to the retainer, the assembling property is greatly improved.

In addition, since the locking rollers are stored in the retainer and rotate with the retainer, there is no fear that the locking roller may be inclined to one side and fail to perform the locking function properly, and a plurality of locking rollers rotate while maintaining a certain distance from each other in the retainer. It is possible to prevent excessive torque from being applied to any one of the locking rollers, and as a result, operation reliability and durability are improved.

In addition, in the present invention, the elastic body pressing the locking rollers is omitted, and the number of parts and assembly man-hours is reduced because one locking roller performs both locking functions without arranging a pair of locking rollers for locking in both directions.

In addition, in the present invention, the locking roller is designed to perform a locking function even when the locking roller is worn, so that the life of the locking roller and the spindle locking device is extended. When the locking roller is worn, its size decreases and the rotation angle for reaching the locked position increases, but taking this into account, the rotation angle of the locking roller is set large from the beginning. Of course, if the rotation angle is increased in such a manner that the locking roller is not worn, the parts may be damaged, but in the present invention, there is no such concern because the driving means of an elastic material performs a damping function in the middle.

In addition, if a normal torque is applied by the motor, the carrier pushes the locking roller to create a release state. At this time, the carrier can rotate independently without interlocking with other parts at an initial predetermined angle. Since the carrier does not rotate at the same time as the cam driver and the spindle connected thereto, but rotates independently by a predetermined angle initially and first releases the locking roller, there is also an effect of reducing the initial load of the device.

1 is a perspective view showing an embodiment of a spindle locking device according to the present invention.
Figure 2 is an exploded perspective view showing the disassembled each component constituting the embodiment shown in Figure 1;
Figure 3 is a perspective view showing a state viewed from the bottom of the embodiment of Figure 1;
4(a) and 4(b) are conceptual diagrams showing a state when a locking assembly constituting an embodiment of the present invention is in a locked state and an unlocked state, respectively.
FIG. 5(a) is a conceptual diagram showing a state in which the locking means of the locking assembly constituting an embodiment of the present invention moves, and FIG. 5(b) is a conceptual diagram showing the rotating state of the carrier when the locking means moves.
Figure 6 is a perspective view showing a state in which the carrier is separated in the embodiment of Figure 1;
7 is a perspective view showing a state in which the locking means is installed on the retainer constituting the embodiment of FIG.
8(a) to 8(c) show the state of being locked in the embodiment of FIG. 1, and FIG. 8(b) shows the carrier removed, and FIG. 8(c) shows the carrier, A plan view with the means and retainers removed.
Figures 9(a) to 9(c) show the state in the unlocked state in the embodiment of Figure 1, Figure 9(b) is the carrier removed, Figure 9(c) is the carrier, driving A plan view with the means and retainers removed.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to elements of each drawing, it should be noted that the same elements are assigned the same numerals as possible even if they are indicated on different drawings. In addition, in describing the embodiments of the present invention, if it is determined that a detailed description of a related known configuration or function obstructs understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

In addition, in describing the constituent elements of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and the nature, order, or order of the component is not limited by the term. When a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but another component between each component It should be understood that may be “connected”, “coupled” or “connected”.

The present invention relates to a spindle locking device, which prevents the spindle locking device from being arbitrarily rotated by external force rather than normal operation by a motor. That is, the rotational force of the motor is transmitted to the spindle 10, which is the drive shaft, but, on the contrary, it prevents the spindle 10 from being rotated by an external force other than the rotational force by the motor acting on the spindle 10. It is done automatically by the structure to be described. Therefore, the actuator is operated only by the operation of the motor, and the state can be stably maintained after the operation of the motor is stopped. The spindle locking device according to the present invention may be applied not only to a power tool such as a grinder, but also to various actuators used in automobiles, for example, a power transmission device for an automatic footrest or a power transmission device for front and rear operation of a seat.

In FIG. 1, the structure of the spindle locking device is shown in a perspective view. In the drawing shown in FIG. 1, the outer housing, the motor, and the gear assembly for transmitting the power of the motor are omitted. The spindle locking device has a spindle 10, which is a driving shaft, and the spindle 10 transmits the rotational force to an external driving device while rotating by the power of the motor. Here, the driving device means a device that is finally operated, such as a grind rotating device of a power tool or an automatic footrest for a vehicle connected to an actuator. At this time, the spindle 10 is not directly connected to the motor, but receives power through the spindle locking device according to the present invention.

Referring to FIG. 2, the spindle 10 has a cylindrical body 11 extending in a substantially one direction to form a skeleton, and there is an assembly groove 12 connected to the driving device. A tolerance ring 18 is assembled to the cam driver 15 opposite the body 11. The tolerance ring 18 protects the device by causing slip when a torque exceeding a preset value is generated. Of course, this tolerance ring 18 may be omitted. Here, the cam driver 15 may be integral to the body 11 or may be assembled to the body 11 as a separate object.

At the upper end of the cam driver 15 is a cam protrusion 17. The cam protrusion 17 protrudes from the upper end of the cam driver 15 and engages the cam groove 35 of the carrier 30 to be described below. Since the cam protrusion 17 and the cam groove 35 are not completely in close contact with each other, but have some clearance from each other, the carrier 30 can independently rotate with respect to the cam driver 15 by a predetermined angle.

The cross section of the cam protrusion 17 has a regular polygonal shape. In this embodiment, the cam protrusion 17 of the cam driver 15 has a square shape, and the inner surface of the cam groove 35 is in close contact with the center of each side of the cam protrusion 17, but is separated from the edge of the cam protrusion 17 It is now able to rotate relative to a predetermined angle. For reference, when looking at the enlarged view of FIG. 1, the contact portions 36 of the cam groove 35 are in close contact with the center of the four sides of the cam protrusion 17, but the separation portions 35 on both sides of the contact portion 36 are cam protrusions 17 It is away from the 4 sides of ). The angle between the inner surface of the spaced portion 35 and the outer surface of the cam protrusion 17 is indicated by α. Since there is such an angle, the carrier 30 is independently rotated with respect to the cam driver 15 by a predetermined angle at the initial stage of rotation. In FIG. 1, α is between about 10° and 20°. This interval may be variously set according to the standard of the spindle locking device or the number and size of the locking means 80 to be described below.

The inter-angle is such that the carrier 30 is independently rotated by a predetermined angle with respect to the cam driver 15 at the initial rotation by the motor, so that the driving means 90 releases the locking means 80 before the full operation. Exists to make More details will be described later.

The spindle locking device has a locking ring (20). The locking ring 20 makes the entire skeleton of the spindle locking device, and has a substantially ring shape. In the installation space 25 inside the locking ring 20, a carrier 30, a part of the spindle 10, a locking assembly 50, a driving means 90, etc. to be described below are installed. The installation space 25 has a substantially cylindrical shape and is open to both sides. The locking ring 20 is installed inside the housing (not shown), but maintains a fixed state without rotating. To this end, there are ribs 23 for preventing rotation on the outer surface of the ring body 21.

The carrier 30 is rotatably installed in the installation space 25. The carrier 30 is installed in a form that blocks one side of the installation space 25 in a disk shape. That is, the carrier 30 is installed outside the installation space 25 to shield the installation space 25, and unlike the fixed lock ring 20, the carrier 30 is a rotatable component. The carrier 30 is connected to a gear assembly installed in the motor and rotated by the motor. Reference numeral 32 denotes a drive hole 32 connected to the gear assembly. There are a total of four driving holes 32, and their positions and numbers can be changed. The driving hole 32 is at a position corresponding to the connection hole 93 of the driving means 90 to be described below. The drive shaft (not shown) extending from the gear assembly passes through the drive hole 32 and is fitted into the connection hole 93.

A cam groove 35 is located at the center of the carrier 30, and the cam protrusion 17 of the cam driver 15 described above is inserted into the cam groove 35. Looking at the cam groove 35 in detail with reference to FIG. 1, the cam groove 35 includes a contact portion 36 and a separation portion 35. The contact portion 36 and the separation portion 35 are adjacent to each other to form the inner surface of the cam groove 35, the contact portion 36 is relatively more protruding toward the center of the cam groove 35, the separation portion 35 ) Extends in the direction of widening the width of the cam groove 35 around the contact portion 36. The spacer 35 has a left spacer 35a and a right spacer 35b forming a pair, and they form a substantially'V' shape.

In this embodiment, both the contact portion 36 and the spacer 35 are flat sections, but some may be made of curved surfaces. When the planar left spacer 35a or right spacer 35b is in close contact with the outer surface of the cam protrusion 17, the carrier 30 can rotate the cam driver 15 and the spindle 10 (Fig. 5(b)) However, in the enlarged view of FIG. 1, since the spacer 35 is separated from the outer surface of the cam protrusion 17, the cam protrusion 17 cannot be pushed.

As described above, due to the angle between the spacer 35 and the cam protrusion 17, the carrier 30 rotates independently of the cam protrusion 17 during the initial rotation period of the carrier 30, while the locking assembly 50 ) To the loose state. More precisely, the driving means 90 rotating together with the carrier 30 rotates the retainer 70 constituting the locking assembly 50 by a predetermined angle so that the locking means 80 moves from the locking space to the release space. will be. As described above, in the present embodiment, there is an angle between the spaced portion 35 and the cam protrusion 17, but such an angle may be omitted. If there is no intervening angle, the spindle locking device may be operated through some initial load section by the locking means 80.

For reference, among the terms used in the description of this embodiment, (i) the locked state is a state in which the spindle 10 is locked without rotating by the locking assembly 50 (see Fig. 8), and (ii) the unlocked state Is a state in which the locking state of the locking assembly 50 is released so that the spindle 10 can rotate (see FIG. 9). In addition, (iii) the locking space is a space in which the locking means 80 is located in a locked state (the edge portion of the operating space S1 in which the locking means 80 is located in Fig. 4(a)), and (iv) release The space means a space in which the locking means 80 is located in an unlocked state (the central part of the operating space S1 in which the locking means 80 is located in FIG. 4(b)).

When the locking assembly 50 is described, the locking assembly 50 is located between the cam driver 15 and the inner surface of the installation space 25 of the locking ring 20. The locking assembly 50 is accommodated in the installation space 25 so that the cam driver 15 and the spindle 10 rotate only selectively by an external force acting on the spindle 10. That is, the spindle locking device is not operated by an external force other than the motor, and when the carrier 30 is independently rotated with respect to the cam driver 15, the locked state of the locking means 80 is released. To this end, the locking assembly 50 has a locking means 80 revolving inside the operating space S1, and the locking means 80 is assembled to the retainer 70 as will be described below. Here, the operating space S1 means a space created between the outer surface of the lock cam 60 and the inner surface of the lock ring 20.

2 and 3, it can be seen that the locking assembly 50 is largely composed of a lock cam 60, a retainer 70, and a locking means 80. Here, the lock cam 60 is inserted into the cam driver 15 and rotates together with the lock cam 60, and has a cylindrical shape through which a driver assembly hole 62 into which the cam driver 15 is inserted. However, on the outer surface of the lock cam 60, a planar flat portion 65 is continuously connected. This flat portion 65 makes the width of the operating space S1 created between the inner surfaces 26 of the installation space 25 different along the circumferential direction. More precisely, the width of the operating space S1 varies along the circumferential direction, and can be divided into a relatively wide release space located at the center and a relatively narrow locking space located at both sides of the release space. Reference numeral 63 denotes a protrusion in which the edge of the retainer 70 to be described below is engaged.

Here, the width (L1) of the release space is equal to or larger than the diameter of the locking means (80) so that the locking means (80) does not get caught in the operating space (S1), but the width (L2) of the locking space is the locking means (80) It is smaller than the diameter of the locking means 80 cannot be moved if it is caught in the locking space. For reference, FIG. 3 shows that the locking means 80 is located in the release space and is in an unlocked state. The retainer 70 and the locking means 80 installed in the retainer 70 move in the direction of arrow ① or ①' When placed in the locking space, it is locked.

Looking in more detail with reference to FIG. 4, FIG. 4(a) is in a locked state, and FIG. 4(b) is in an unlocked state. For convenience, the carrier 30, the retainer 70, and the spindle 10 are shown in a removed state. First, looking at the locked state, the locking means 80 is oriented to one side and is located in the locking space. At this time, the diameter (R) of the cross section of the locking means (80) is the same as the width (L2) of the locking space, so that it is inserted. Therefore, when an external force to rotate the lock cam 60 to which the spindle 10 is connected in a clockwise direction acts, the locking means 80 will block this. And looking at the unlocked state, the locking means 80 is located in the center of the operating space (S1), that is, in the release space. The diameter (R) of the cross-section is smaller than the width (L1) of the release space, so that a space (S2) is created between the locking space and the installation space (25). That is, the unlocked state is achieved, and the lock cam 60 to which the spindle 10 is connected may rotate together with the retainer 70 and the locking means 80.

On the other hand, Figure 5 (a) shows a state in which the locking means 80 of the locking assembly 50 constituting an embodiment of the present invention moves, and Figure 5 (b) shows the movement of the locking means 80 When the carrier 30 is showing a rotational state. Looking at the conversion process of the unlocked state -> locked state with reference to this, first, in the unlocked state, the locking means 80 is located in the release space. For convenience of explanation, the locking means located in the release space is indicated by 80a, and the locking means located in the locking space is indicated by 80b. When the locking means (80a) is positioned in the release space, it is in an unlocked state, and the spindle 10 and the lock cam 60 coupled to the spindle 10 can rotate clockwise or counterclockwise. 5(b) shows a state in which the carrier 30 rotates and engages with the cam protrusion 17. In this engaging process, the locking means 80a is moved to the release space. In this state, when the carrier 30 rotates in the direction of the arrow ①, the cam protrusion 17 also rotates in the same direction, and as a result, the spindle 10 coupled with the cam driver 15 also rotates.

At this time, as shown in the right figure of Fig. 5(b), when the carrier 30 rotates in the direction of the arrow ①', the carrier 30 rotates independently as the state in engagement with the cam protrusion 17 is released. Further, the driving means 90 rotating together with the carrier 30 moves the retainer 70 and the locking means 80b to be described later from the release space to the locking space to create a locked state. That is, in Fig. 5(a), the locking means 80b is moved to the locking space. In this case, it is locked, and the spindle 10 and the lock cam 60 coupled to the spindle 10 cannot rotate clockwise. It can rotate to some extent in the counterclockwise direction, but it becomes locked by being bitten back into the opposite locking space. For reference, when a stop signal is input while the carrier 30 is operating, the carrier 30 and the driving means 90 rotate independently from the cam driver 15 in the opposite direction (the direction of the arrow ①') while rotating at a predetermined angle while the locking assembly ( 50) is locked, and this is called backtalk operation.

On the other hand, when the locking means (80c) is worn, its diameter is reduced, and the rotation angle for the locking means (80c) to move to the locking space is increased. 5(a), the locking means 80b before wear can move from the release space to the locking space if the diameter is rotated only by α1°, but the locking means 80c whose diameter has been reduced due to wear must rotate by α2°. You can move to the locking space. If the locking means (80c) is not completely moved to the locking space in a worn state, a clearance occurs and the locked state cannot be properly implemented. In order to prevent this, in the present embodiment, the rotation angle α° of the carrier 30 and the driving means 90 in the back torque operation is set to at least α2° or more. Then, even if the locking means 80c is worn, it is sufficiently rotated to an angle taking into account this so that it can rotate to a farther locking space.

Based on the drawing, the angle α at which the carrier 30 can rotate independently from the cam driver 15 is a virtual line extending the center of the release space from the center of the locking assembly 50 and the locking assembly It is greater than the angle α2 between the imaginary lines extending the center of the worn locking means 80 in the locked state from the center of 50.

However, if the rotation angle is increased in this way while the locking roller is not yet worn, damage to the parts may occur. For example, the retainer 70 or the locking means 80 may be damaged in the process of further rotation by α2-α1°. To solve this, in this embodiment, the driving means 90 made of an elastic material performs a damping function in the middle. That is, the driving means 90 made of elastic material absorbs the excessive torque generated in the process of further rotation by α2-α1°. The driving means 90 may be slightly elastically deformed and disperse the torque. More details will be described again when describing the driving means 90.

A retainer 70 is installed in the operating space S1. The retainer 70 is a target to which a plurality of locking means 80 revolving inside are pre-assembled, and is installed in the installation space 25 so as to surround the lock cam 60. The retainer 70 surrounds the lock cam 60, but is not completely coupled to each other, and thus can rotate independently of the lock cam 60.

2 and 7, an inner space 72 in which the lock cam 60 is accommodated is created in the center of the cylindrical body 71 constituting the retainer 70, and the spindle 10 is formed along the circumferential direction. A plurality of storage spaces 73 extending in the longitudinal direction are arranged. In the storage space 73, an open inlet portion 73' is made at one side along the longitudinal direction of the spindle 10, so that the locking means 80 can be inserted. Further, on the opposite side of the storage space 73, a seating end 75 is made in a direction intercepting the storage space 73 to support one end of the locking means 80. Therefore, the locking means 80 entering the storage space 73 does not fall downward due to the seating end 75.

There is a connection protrusion 77 on the upper surface of the retainer 70. There are a plurality of connecting protrusions 77 surrounding the upper surface of the retainer 70 in the circumferential direction, in which the damping hole 95 of the driving means 90 is fitted. When the damping hole 95 is inserted into the connecting protrusion 77, the driving means 90 and the retainer 70 rotate together. In FIG. 6, the connecting protrusion 77 is inserted into the damping hole 95, and it can be seen that a part of the connecting protrusion 77 is exposed through the damping hole 95.

A locking means 80 is installed in the retainer 70. The locking means 80 is accommodated in the storage space 73 of the retainer 70 and rotates together with the retainer 70. The locking means 80 is pinched in the operating space S1 or the pinched state is released. When the locking means 80 is pinched in the locking space of the operating space S1, the locking function of the spindle locking device is activated and locked. The locking means 80 has a circular cross section and revolves in the operating space S1. The locking means 80 may prevent rotation in a clockwise or counterclockwise direction while moving the operating space S1. For example, the locking means 80 of FIG. 4(a) prevents the spindle 10 and the locking cam 60 coupled thereto from rotating clockwise. When the locking means 80 moves and is placed at the right end It can also prevent clockwise rotation.

Referring to FIG. 7, it can be seen that the locking means 80 is installed in the retainer 70. As such, the plurality of locking means 80 performing the locking function in the present invention are first accommodated in the retainer 70. Can be assembled to the spindle locking device in the state. Since the locking means 80 has a rounded outer surface and a large number of them, the assembling property may be inferior, but since it is installed after being pre-assembled to the retainer 70, installation becomes easy. In addition, in this embodiment, since the locking means 80 are accommodated in the retainer 70 and revolve with the retainer 70 in a properly erected posture, there is a concern that the locking means 80 is inclined to one side so that the locking function cannot be properly performed. There is no In particular, since the plurality of locking means 80 revolve while maintaining a constant distance from each other in the retainer 70, excessive torque is prevented from being applied to any one of the locking means 80.

Next, looking at the driving means (90), the driving means (90) is installed between the carrier (30) and the retainer (70), and the carrier (30) rotates independently of the cam driver (15). When rotating together with the carrier 30, the locking assembly 50 is rotated to create an unlocked state, or after the operation of the driving device is completed, the locking assembly 50 is rotated in the opposite direction (back torque) to be locked. It plays a role in making it. In addition, the driving means 90 is an excessive torque that can be applied to the locking assembly 50 when the locking assembly 50 is locked by the back torque, as when it changes from the left picture to the right picture in FIG. 5(b). It also has a damping function that absorbs.

The driving means 90 has a disk shape with a through hole through which the cam driver 15 passes at the center. The driving means 90 is a medium that is connected to the retainer 70 and at the same time is connected to the motor to transmit the rotational force of the motor to the retainer 70. The driving means 90 has a connection hole 93 for connecting to the motor, more precisely, a gear assembly, and a damping hole 95 into which the connecting protrusion 77 protruding from the retainer 70 is fitted. . There are a plurality of the connection holes 93 and the damping holes 95 along the circumferential direction of the driving means 90. The connection hole 93 is connected to the drive hole 32 of the carrier 30, and the drive shaft protruding from the gear assembly connects them together and rotates, so that the carrier 30 and the driving means 90 rotate at the same time.

The driving means 90 also rotates independently of the cam driver 15 when the carrier 30 rotates independently of the cam driver 15. The driving means 90 rotates the retainer 70 while rotating together with the carrier 30 at the initial stage of operation of (i) the driving device (for example, the automatic footrest) (refer to the directions of arrows ② and ③ in Fig. 6). Make the locking assembly 50 in an unlocked state, and (ii) rotate the retainer 70 while rotating in the opposite direction together with the carrier 30 even at the end of stopping the operation of the driving device (opposite of the arrows ② and ③ in Fig. 6). Direction) to make the locking assembly 50 in a locked state.

The driving means 90 is made of an elastic material, for example, may be a variety of elastic materials such as silicone, natural rubber or synthetic rubber. When the driving means 90 is made of an elastic material, it is possible to sufficiently set the angle α at which the carrier 30 can rotate independently of the cam driver 15 in consideration of the wear of the locking means 80. have. As described above, when the locking means 80 is worn, its diameter decreases, and the rotation angle for the locking means 80 to move to the locking space increases. In Fig. 5(a), the locking means 80 before wear can move from the release space to the locking space if the diameter is rotated only by α1°, but the locking means 80, whose diameter has been reduced due to wear, is locked only by rotating α2°. You can move into space. In this embodiment, an angle (α°) at which the carrier 30 and the driving means 90 rotate in the back torque operation from the beginning is set to at least α2° or more. Then, even if the locking means 80 is worn, it is sufficiently rotated up to an angle taking into account this so that it can rotate to a farther locking space.

At this time, if the rotation angle is increased in this way while the locking roller is not yet worn, damage to the component may occur. For example, the retainer 70 or the locking means 80 may be damaged in the process of further rotation by α2-α1°. However, since the driving means 90 is made of an elastic material, it performs a damping function between the locking assembly 50 and the driving shaft of the gear assembly. That is, before the locking means 80 is worn, the driving means 90 made of elastic material absorbs excessive torque generated in the process of further rotating the carrier 30 and the driving means 90 by α2-α1°. The driving means 90 is capable of absorbing the torque while being elastically deformed due to the nature of the material.

In this embodiment, the angle α at which the carrier 30 can rotate independently from the cam driver 15 is a virtual line extending the center of the release space from the center of the locking assembly 50 and the locking It is 1° or more greater than the angle α1 between the imaginary lines extending the center of the locking means 80 in the locked state from the center of the assembly 50. By allowing this amount of margin, the locking means 80 can be rotated to the locked position even if the degree of wear of the locking means 80 is large. For reference, the angle α at which the carrier 30 can rotate independently from the cam driver 15 and a virtual line extending the center of the release space from the center of the locking assembly 50 and the locking assembly 50 The difference in the angle (α1) between the virtual lines extending the center of the locking means 80 in the locked state from the center of may be 1° to 15°, which may vary depending on the size or purpose of the device to be applied. have.

As a result, when the locking means 80 comes to the release space, the carrier 30 engages with the cam driver 15 of the spindle 10 and rotates together, but when a stop signal is input, the carrier 30 and the driving means 90 Makes the locking assembly 50 locked while rotating in the opposite direction independently of the cam driver 15, and at this time, the angle α at which the carrier 30 and the driving means 90 independently rotate and the locking means ( The difference α-α1 between the angles α1 at which 80 is actually rotated is absorbed by the driving means 90 made of an elastic material and damped. Therefore, in the present invention, the locking roller is designed to perform a locking function even when the locking roller is worn, so that the life of the locking roller and the spindle locking device can be extended.

On the other hand, the driving means 90 is not made in a plate shape as in the previous embodiment, but may have various shapes by being assembled to the retainer 70. For example, the driving means 90 may be assembled on the upper surface of the retainer 70 and connected to the carrier 30 to rotate in association with the rotation of the carrier 30. That is, the drive means 90 is not directly connected to the drive shaft of the gear assembly, but is connected to the carrier 30. At this time, since the drive means 90 is an elastic material, the retainer 70 absorbs excessive torque of the carrier 30 It can be delivered to.

In another embodiment, the driving means 90 may be omitted, and the carrier 30 may directly release the locked state of the locking assembly 50. A release protrusion protrudes from the carrier 30 in the direction of the operation space S1, and the release protrusion is the retainer 70 or the locking means 80 when the carrier 30 rotates independently of the cam driver 15. ) To make it loose.

Alternatively, the driving means 90 may be made integrally with the carrier 30. In this case, while the carrier 30 rotates independently with respect to the cam protrusion 17, the driving means 90 located at the bottom rotates the retainer 70 to create an unlocked state. The driving means 90 may be made integrally with the carrier 30 in a manner that is insert-injected or assembled.

Next, the operation process of the present invention will be described with reference to the drawings. 8 and 9 show the initial operation of the spindle locking device by the motor. FIG. 8 is before the motor is still operated, and FIG. 9 shows a state in which the motor is operated and the spindle locking device is changed from a locked state to an unlocked state.

Referring to Figure 8, Figure 8 (a) is shown up to the carrier 30, but in Figure 8 (b) the carrier 30 is omitted, in Figure 8 (c) the carrier 30, the driving means 90 and The retainer 70 is also shown omitted. However, they are all in the same state, that is, locked. For reference, the dotted line in FIGS. 8(b) and 8(c) shows the shape of the cam groove 35 of the carrier 30 to aid understanding.

First, when the motor operates, the gear assembly connected to the motor operates, and the carrier 30 connected to the gear assembly rotates. 8(a), the drive shaft is inserted into the drive hole 32 in the carrier 30 to rotate the carrier 30 in the direction of arrow ①. For reference, the cam groove 35 of the carrier 30 is not yet engaged with the cam protrusion 17. Therefore, the carrier 30 can rotate independently of the cam protrusion 17.

Meanwhile, the driving shaft is connected to the driving means 90 through the driving hole 32. More precisely, the driving shaft is connected to the connection hole 93 of the driving means 90. Therefore, when the carrier 30 rotates, the driving means 90 also rotates together. Then, the driving means 90 rotates the connected locking assembly 50 to make it from the locked state to the unlocked state. More precisely, when the driving means 90 rotates in the direction of the arrow ② in FIG. 8(b), which is the same direction as the rotation direction of the carrier 30, the driving means 90 is a connecting protrusion fitted into the damping hole 95 Push (77) in the direction of arrow ③. As a result, as shown in Fig. 8(c), the locking means 80 rotates in the direction of the arrow ④ and moves from the locking space to the release space. In this case, the locking assembly 50 is in an unlocked state.

Fig. 9 shows an unlocked state. Like FIG. 8, the carrier 30 is omitted in FIG. 9(b), and the carrier 30, the driving means 90, and the retainer 70 are omitted in FIG. 9(c). However, they are all in the same state, that is, the state of release. For reference, the dotted line in FIGS. 9(b) and 9(c) shows the shape of the cam groove 35 of the carrier 30 to aid understanding.

When the state is released, the cam protrusion 17 is engaged with the cam groove 35 of the carrier 30. More precisely, the contact surface is made by being in close contact with the outer surface of the cam protrusion 17 to the contact portion 36 of the cam groove 35. Therefore, when the carrier 30 rotates in the direction of the arrow ①, the cam driver 15 and the spindle 10 rotate together. In addition, the drive device to which the spindle 10 is connected also rotates and operates. For example, the automatic footrest may slide and protrude outward.

9(b), the driving means 90 can see the state in which the locking means 80 has been moved to the release space, and in FIG. 9(c), the locking means 80 is located in the release space and the locking ring ( It can be seen that it is in a rotatable state separated from the inner surface of 20). Therefore, the spindle 10 can rotate continuously without being locked.

In this way, if a normal torque is applied by the motor, the driving means 90 pushes the locking means 80 to create an unlocked state. At this time, the carrier 30 and the driving means 90 are initially at a predetermined angle. It rotates independently without interlocking with other parts such as the cam driver 15. As described above, since the carrier 30 and the driving means 90 are initially rotated independently by a predetermined angle, the locking means 80 is first brought into a released state, so that the initial load of the device can be reduced.

In addition, while the spindle 10 and the driving device are operating, when a stop signal is applied, the motor is stopped. When the motor is stopped, the locking assembly 50 is locked, so that the spindle 10 and the driving device are not rotated randomly by an external force applied from the driving device. For example, when the occupant steps on the footboard while the footboard protrudes, the footboard should not retreat. In this embodiment, back torque is made to stably lock the locking assembly 50 into a locked state. That is, in the process of stopping the motor, the locking assembly 50 is switched to a locked state by rotating a predetermined angle in the opposite direction.

Specifically, when the motor rotates in the opposite direction, the carrier 30 and the driving means 90 rotate in the opposite direction together. And the driving means 90 rotates the retainer 70 and the locking means 80 to move to the locking space. At this time, the carrier 30 and the driving means 90 rotate independently without engaging the cam protrusion 17. Looking at the process of switching from the left picture to the right picture of Fig. 5(b), the carrier 30 is indicated by the arrow ① It can be seen that it can rotate independently of the cam protrusion 17 when rotating in the 'direction.

At this time, in this embodiment, the rotation angle α at which the carrier 30 and the driving means 90 are back-torque is greater than the rotation angle α1 at which the locking means 80 moves from the release space to the locking space. This is in consideration of the wear of the locking means 80, and as shown in Fig. 5(a), the worn locking means 80 has a rotational angle α2 that moves from the release space to the locking space larger than that of the prior art. To do this, the angle at which the driving means 90 is back-torque must be increased.

Of course, the rotation angle of the locking means 80 in the unworn state is only α1, so that the carrier 30 and the driving means 90 further rotate by an angle of α-α1, which may cause damage to the parts. , In this embodiment, the driving means 90 absorbs it while elastically deforming. Therefore, it is possible to create a locked state even if the locking means 80 is worn without applying excessive force to components such as the locking assembly 50 or the driving means 90.

On the other hand, looking at the process of implementing the locking by the locking assembly 50 in the locked state, first, torque is applied to the spindle 10 by an external force. When the force to rotate the spindle 10 acts on the driving device side rather than the motor, the force is transmitted to the cam driver 15 connected to the spindle 10, and the locking cam of the locking assembly 50 connected to the cam driver 15 (60) also receives rotational force.

Referring to FIG. 4A as an example, when the spindle 10 receives a rotational force in the clockwise direction, the force attempts to rotate the lock cam 60 in the same direction. However, the rotational force cannot rotate the part by the locking assembly 50. This is because the locking means 80 of the locking assembly 50 is located in the locking space, and the locking means 80 is at the edge of the operating space S1 between the outer surface of the lock cam 60 and the inner surface of the locking ring 20. It is stuck in the located locking space. Therefore, the spindle 10 and the driving device can be kept locked without rotating.

In the above, even if all the constituent elements constituting the embodiment according to the present invention have been described as being combined into one or operating in combination, the present invention is not necessarily limited to this embodiment. That is, within the scope of the object of the present invention, all of the constituent elements may be selectively combined and operated in one or more. In addition, terms such as "include", "consist of" or "have" described above mean that the corresponding component may be present unless otherwise stated, excluding other components Rather, it should be interpreted as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art, unless otherwise defined. Terms generally used, such as terms defined in the dictionary, should be interpreted as being consistent with the meaning of the context of the related technology, and are not interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

10: spindle 15: cam driver
17: cam protrusion 20: lock ring
25: installation space 30: carrier
32: drive hole 35: cam groove
50: locking assembly 60: rock cam
65: flat portion 70: carrier
73: storage space 77: connecting projection
80: locking means 90: driving means

Claims (20)

A lock ring that is installed inside the housing and has an installation space inside,
At least a portion of the spindle is located in the installation space, a cam driver is on one side and a driving device is connected on the other side,
A carrier housed in the installation space and connected to the motor to transmit the rotational force of the motor to the spindle while rotating and having a cam groove engaged with the cam driver at the center;
The installation space is accommodated in the installation space so that the spindle does not rotate by an external force acting on the driving device, and a plurality of locking means revolving inside the installation space enclose the cam driver while being accommodated in the retainer. Spindle locking device including a locking assembly installed in the.
The method of claim 1, wherein a clearance exists along the relative rotation path at the connection portion between the carrier and the cam driver, so that the carrier rotates independently by a predetermined angle to release the locked state by the locking assembly, and then rotates together with the cam driver. Spindle locking device.
The method of claim 2, wherein the locking assembly
A lock cam that creates an operating space between the inner surface of the installation space on the outer surface and rotates with the cam driver,
A retainer installed between the outer surface of the lock cam and the inner surface of the installation space so as to surround the lock cam, and a plurality of storage spaces arranged along the circumferential direction extending in the longitudinal direction of the spindle,
Spindle comprising a plurality of locking means that are cylindrically accommodated in the storage space of the retainer and revolve together with the retainer in the operating space according to the rotation of the lock cam, but are selectively inserted into one side of the operating space to create a locked state Locking device.
The method of claim 1, wherein the retainer has a cylindrical shape and an inner space in which a lock cam is accommodated is created at the center, and a plurality of storage spaces are arranged along the circumferential direction, and one of the storage spaces is opened and locked along the longitudinal direction of the spindle. A spindle locking device in which a means can be inserted, and the opposite side of the storage space is blocked to support the locking means.
The method of claim 1, wherein the carrier has a cam groove, and the cam driver protrudes a cam protrusion inserted into the cam groove, and a flat section is formed on at least a portion of the inner surface of the cam groove and the outer surface of the cam protrusion facing each other, and the carrier And a spindle locking device capable of independently rotating the carrier by a predetermined angle with respect to the cam driver as there is a clearance along the relative rotation path of the cam driver.
The spindle locking according to claim 5, wherein the cam protrusion of the cam driver has a regular polygonal shape, and in a locked state, the inner surface of the cam groove is in close contact with the center of each side of the cam protrusion, but is spaced apart from the edge of the cam protrusion to allow relative rotation at a predetermined angle. Device.
The locking space according to claim 3, wherein the operating space is composed of a relatively wide release space and a relatively narrow locking space located on both sides of the release space, and the diameter of the cross section of the locking means is smaller than the width of the release space. Spindle locking device equal to or greater than the width of
The method of claim 7, wherein a release protrusion protrudes from the carrier in the direction of the operating space, and when the carrier rotates independently of the cam driver, the retainer or locking means is pushed to create an unlocked state, or between the carrier and the retainer. A spindle locking device that rotates the retainer or locking means when a driving means is installed and the carrier rotates independently of the cam driver to create an unlocked state.
The locking state of claim 1, wherein an angle (α) at which the carrier can rotate independently from the cam driver is a virtual line extending from the center of the locking assembly to the center of the release space and the locking state in a locked state from the center of the locking assembly. Spindle locking device equal to or greater than the angle α1 between the imaginary lines extending the center of the means.
A lock ring that is installed inside the housing and has an installation space inside,
At least a portion of the spindle is located in the installation space, a cam driver is on one side and a driving device is connected on the other side,
A carrier housed in the installation space and connected to the motor to transmit the rotational force of the motor to the spindle while rotating and having a cam groove engaged with the cam driver at the center;
The installation space is accommodated in the installation space so that the spindle does not rotate by an external force acting on the driving device, and a plurality of locking means revolving inside the installation space enclose the cam driver while being accommodated in the retainer. A locking assembly installed in the
A spindle locking device comprising a driving means installed between the carrier and the retainer to rotate the locking assembly while rotating together with the carrier when the carrier rotates independently of the cam driver to create an unlocked or locked state.
The method of claim 10, wherein the driving means is a disk shape having a through hole through which the cam driver passes at a center, and the driving means is connected to the retainer and at the same time, when the carrier rotates independently of the cam driver. Spindle locking device that rotates with the carrier to release or lock the locking assembly.
The method of claim 11, wherein the driving means has a connection hole for connection to the motor, and the driving means has a damping hole into which a connection protrusion protruding from the retainer is fitted, and the connection hole and the damping hole are the driving means. Spindle locking device with a large number along the circumferential direction of.
The spindle locking device according to claim 12, wherein the driving means is made of a material capable of elastic deformation.
The method of claim 10, wherein the locking assembly
A lock cam that creates an operating space between the inner surface of the installation space on the outer surface and rotates with the cam driver,
A retainer that is installed between the outer surface of the lock cam and the inner surface of the installation space so as to surround the lock cam, and a plurality of storage spaces arranged along the circumferential direction extends in the longitudinal direction of the spindle and is connected to the driving means to be rotated by the driving means. Wow,
Spindle comprising a plurality of locking means that are cylindrically accommodated in the storage space of the retainer and revolve together with the retainer in the operating space according to the rotation of the lock cam, but are selectively inserted into one side of the operating space to create a locked state Locking device.
15. The method of claim 14, wherein the retainer has a cylindrical shape and an inner space in which a lock cam is accommodated is created at the center, and a plurality of storage spaces are arranged along the circumferential direction, and one of the storage spaces is opened and locked along the longitudinal direction of the spindle. A spindle locking device in which a means can be inserted, and the opposite side of the storage space is blocked to support the locking means.
The spindle locking according to claim 15, wherein the cam protrusion of the cam driver has a regular polygonal shape, and in a locked state, the inner surface of the cam groove is in close contact with the center of each side of the cam protrusion, but is spaced apart from the edge of the cam protrusion to allow relative rotation at a predetermined angle. Device.
The locking state of claim 10, wherein the angle (α) at which the carrier can rotate independently from the cam driver is a virtual line extending from the center of the locking assembly to the center of the release space and the locking state in a locked state from the center of the locking assembly. Spindle locking device greater than the angle α1 between the imaginary lines extending the center of the means.
18. The method of claim 17, wherein when the locking assembly is released, the carrier engages with the cam driver of the spindle and rotates together, but when a stop signal is input, the carrier and the driving means rotate in the opposite direction independently of the cam driver to rotate the locking assembly. A spindle locking device in which a difference between an angle at which the carrier and the driving means independently rotate (α) and an angle at which the locking assembly rotates (α1) can be absorbed and damped by the driving means of an elastic material.
A power tool to which the spindle locking device of claim 1 is applied.
An actuator for a vehicle to which the spindle locking device of any one of claims 1 to 18 is applied.

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