JP2002227884A - One-way clutch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent running out of grease. SOLUTION: A groove 107d is provided on a surface of a loosening sleeve 107 with which a coil spring 110 is in sliding contact or pressure contact, and the grease is reserved in the groove. A primary sleeve 101 is provided with through-holes 101c and 101g, a secondary sleeve 105 is provided with a through- hole 105f, the loosing sleeve 107 is provided with a through hole 107e, and a loosening spring guide 108 is provided with a through-hole 108a, thereby guiding the grease.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-way clutch device, and more particularly to a one-way clutch device used for an operating device for operating a brake device of a railway vehicle.

[0002]

2. Description of the Related Art For example, an actuator (electric brake actuator) described in a pamphlet of International Publication No. WO98 / 47750 based on the Patent Cooperation Treaty is provided with a push rod for driving a brake device based on rotation of a motor. A service brake mechanism that moves in the axial direction, and a safety brake mechanism that moves the push rod in the axial direction by driving a piston having a special shape by releasing a spring held in a compressed state. I have. In the service brake mechanism, the screw of the ball screw is rotated by the rotation of the motor, and the rotational motion is converted into a linear motion. And
The push rod is advanced by a predetermined stroke by this linear motion to apply a brake. When the brake is applied, the reaction force from the brake device acts in a direction to reversely rotate the motor. In order to prevent reverse rotation by the motor alone, it is necessary to continue to supply current to the motor, which wastes power. Therefore, a one-way clutch device is provided between the motor and the ball screw in order to prevent power from being wasted and to prevent reverse rotation of the motor.

The one-way clutch device has a configuration in which the connection between members is turned on and off by loosening or tightening a coil spring. When a rotational torque is applied from a motor, the coil spring is loosened and the primary side clutch is loosened. The rotation on the (motor side) is transmitted to the secondary side (ball screw side) as it is. On the other hand, when rotational torque is applied from the screw of the ball screw, the coil spring is tightened, and rotation of the screw is prevented. Therefore, the reaction force from the brake device is not transmitted to the motor.

[0004]

The coil spring of the conventional one-way clutch device as described above has a small amount of expansion and contraction of the spring diameter due to loosening and tightening. It has a feature that it is pressed against a member to be wound) with a high surface pressure. As described above, since the amount of expansion and contraction of the spring diameter is small, even if the spring diameter is increased when the spring is loosened, a sufficient gap is not secured between the coil spring and the tightened member. Therefore, the coil spring that rotates with the rotation of the motor slides at a high speed with respect to the member to be tightened. When such high-speed sliding and high surface pressure contact are alternately repeated, grease used for lubrication is less likely to be held between the coil spring and the member to be tightened. Therefore, the grease is likely to run out.
In addition, at the time of a braking operation or a loosening operation, grease not only between the coil spring and the member to be tightened but also at each rotating portion is scattered by centrifugal force, so that the grease is likely to run out. When the grease runs out, excessive wear occurs between the contacting members, and the temperature increases. As a result, the clutch function may be hindered.

[0005] In view of the above-mentioned conventional problems, an object of the present invention is to provide a one-way clutch device for preventing grease from running out.

[0006]

SUMMARY OF THE INVENTION The present invention provides a housing, a driving member provided in the housing and rotated by a power source, and a driving member provided in the housing.
A driven member that is rotationally driven by the driving member, a fixed member fixed in the housing, and a spring diameter that is expanded and contracted by engaging with the driving member or the driven member, thereby forming the driven member. A one-way clutch device having a coil spring for releasing or fixing the fixing member to the fixing member, wherein a plurality of grooves for holding grease are provided on a surface of the fixing member facing the coil spring. 1). In the one-way clutch device configured as described above, since the centrifugal force does not act on the groove provided in the fixing member, the grease can always be stably stored. Further, the grease stored in the groove is not pushed out of the groove even if it receives a high surface pressure due to the fastening of the coil spring to the fixing member.

In the one-way clutch device, a predetermined amount of grease is sealed in the housing, and a plurality of through holes for guiding the grease, which can communicate with each other, on the driving side member, the driven side member and the fixing member. May be provided (claim 2). In this case, the grease is always stably supplied through the plurality of through holes that can communicate with each other.

[0008]

FIG. 1 is a sectional view of a service brake mechanism including a one-way clutch device 1 according to one embodiment of the present invention. The service brake mechanism is a part of an operating device that operates a brake device (not shown) by a push rod. In the figure, the service brake mechanism includes a motor unit 2 and an output unit 3 in addition to the one-way clutch device 1. A motor 22 is provided inside the motor housing 21 in the motor section 2. Motor 22
Has an output shaft 22a with a splined tip.

The one-way clutch device 1 includes a motor 22
The one-way clutch 10 connected to the main shaft 22a is built in the clutch housing 12. FIG.
FIG. 2 is a cross-sectional view illustrating the one-way clutch 10 in an enlarged manner, in which a clutch housing 12 is not illustrated. In FIG. 2 with reference to FIG. 1, the one-way clutch 10
A primary sleeve (drive-side member) 101 spline-coupled to the second main shaft 22a, an output shaft 103 coaxially arranged facing the main shaft 22a, and rotatably supported by a bearing 102; , Bush 1
And a loose sleeve 1 attached to the secondary sleeve 105 via a pair of bearings 106.
07, a loose spring guide 108 inserted in the primary sleeve 101, a ring 109 mounted on the right end side of the loose spring guide 108, and provided so as to wind around the secondary sleeve 105 and the loose sleeve 107. A pair of bushings (made of rubber) 111 held between the primary sleeve 101 and the secondary sleeve 105;
A stopper 112 that engages with and fixes the loosening sleeve 107 is configured as a main component. One end (upper left) of the coil spring 110 is locked to the secondary sleeve 105, and the other end (lower right) is connected to the primary sleeve 101.
It is locked to. The loosening sleeve 107 is normally a fixing member fixed by a stopper 112, but in an emergency such as a failure of the motor 22, it can be rotated if the engagement is released by pulling down the stopper 112 downward.

FIG. 3 is a diagram showing the primary sleeve 101 alone, (a) is a side view including a partial cross section, (b)
FIG. 3 is a view of the primary sleeve 101 as viewed from a direction B in FIG. The primary sleeve 101 has a hub portion 101a.
And a cylindrical portion 101b. In the hub part 101a,
Plural (eight in this example) through holes 1 for guiding grease
01c are provided at equal intervals on the same circle. Also,
A first main shaft portion 101d whose inner peripheral surface is splined is formed in the axial direction of the center of the hub portion 101a, and a second main shaft portion 10 having a larger diameter than the first main shaft portion is further formed outside the first main shaft portion 101d.
1e is formed integrally. Two recesses 101f are formed at two positions 180 degrees in the circumferential direction of the outer periphery of the second main shaft portion 101e, and the bush 111 (FIG. 2) engages here. A large number of through holes 101g for guiding grease are formed on the outer peripheral surface of the cylindrical portion 101b. A cutout portion 101h is formed at an end of the cylindrical portion 101b over 90 degrees in the circumferential direction.

FIG. 4 is a view showing the secondary sleeve 105 as a single unit. FIG. 4A is a view of the secondary sleeve 105 from the left in FIG. 2 and FIG. 4B is a view of the secondary sleeve 105 from above in FIG. FIG. The secondary sleeve 105
It has a flange portion 105a and a tubular portion 105b. A hole 105h is formed on the inner peripheral side of the flange 105a, and two diametrically opposed portions of the inner wall surface are formed in an arc shape having a larger diameter than the other portion, thereby forming a concave portion 105c. I have. The aforementioned bush 111 engages with the concave portion 105c. The bush 111 is the concave portion 10 of the primary sleeve 101.
It is possible to move in the circumferential direction in the range of the illustrated predetermined angle θ while being engaged with 1f. On the other hand, a keyway 105e is provided in a shaft hole 105d provided in the central axis direction of the cylindrical portion 105b. By inserting a key (not shown) into this key groove 105e, the secondary sleeve 105 is fixed to the output shaft 103 (FIG. 2). Referring to FIG. 2 as well, the cylindrical portion 105b is provided with four through-holes 105f obliquely extending from the inner peripheral side to the outer peripheral side at equal intervals in the circumferential direction. These through holes 105f are provided for guiding grease. A hole 10 is provided at one location on the outer periphery of the flange 105a.
5 g is provided, and one end of the coil spring 110 is locked here.

FIGS. 5A and 5B are views showing the loosening spring guide 108 alone, wherein FIG. 5A is a side view, and FIG. 5B is a view of the guide 108 in FIG. The loosening spring guide 108 is cylindrical, and has a large number of through holes 108a for guiding grease over the entire outer periphery.

FIGS. 6A and 6B are views showing the loosening sleeve 107 alone, wherein FIG. 6A is a plan view or a side view, and FIG.
FIG. 5 is a view of the loosening sleeve 107 viewed from the direction B in FIG. The loosening sleeve 107 has a flange portion 107a and a tubular portion 107b. A plurality (eight in this example) of recesses 107c are formed at equal intervals on the outer periphery of the flange-like portion 107a, and a stopper 112 is provided in any one of the recesses 107c.
By engaging (FIG. 2), the loosening sleeve 107 is fixed. Referring also to FIG. 2, a groove 107 extending in parallel to the axial direction facing the coil spring 110 is formed in the cylindrical portion 107b.
A plurality of (d in this example, 16) are provided at equal intervals in the circumferential direction. A through hole 107e is provided in the radial direction near one end of each groove 107d. These grooves 107d and through holes 107e are provided to guide grease.

Returning to FIG. 1, the output shaft 103 of the one-way clutch 10 is engaged with the gear 31 of the output unit 3. When the gear 31 rotates, the screw of a ball screw (not shown) rotates, and the push rod for operating the brake device moves forward or backward. In the clutch housing 1, about 1 /
A part of the grease 13 is sealed in the grease 13, and the primary sleeve 101, the secondary sleeve 105, the loosening spring guide 108, and the loosening sleeve 107 are partially immersed in the grease 13. In FIG. 2, a through hole 101g of the primary sleeve 101 can communicate with a through hole 108a of an adjacent loosening spring guide 108. Also,
The through hole 108a is loosened through the gap between the strips of the coil spring 110 and the groove 107d of the sleeve 107 and the through hole 107e.
Can be communicated with. Further, the through hole 107e communicates with the through hole 105f of the secondary sleeve 105.

Next, the operation of the one-way clutch device configured as described above will be described. First, it is assumed that the bush 111 is at the end in the counterclockwise direction in FIG. 4A with respect to the secondary sleeve 105 (that is, the illustrated position). Further, it is assumed that the coil spring 110 is in a tightened state and the secondary sleeve 105 and the loosening sleeve 107 are in a fixed state. Here, when the motor 22 starts rotating in a predetermined direction corresponding to the braking operation, the primary sleeve 101 also starts rotating. When the rotation of the primary sleeve 101 starts, the bush 110 rotates clockwise in FIG. 4A and reaches the end in the clockwise direction.
, The rotational torque is transmitted to the secondary sleeve 105. Thus, when the secondary sleeve 105 tries to rotate,
Coil spring 11 having one end engaged with next sleeve 105
0 is loose. As a result, the coil spring 110 expands in diameter and is released from the state in which the loosening sleeve 107 as a fixing member is fixed. As a result, the secondary sleeve 105 and the coil spring 110 become rotatable and rotate together with the primary sleeve 101. By the rotation of the secondary sleeve 105, the output shaft 103 rotates, the screw of a ball screw (not shown) rotates, and the push rod moves forward. Also, the rotating coil spring 110
Is in a state of sliding at a high speed with respect to the loosening sleeve 107 as a fixing member.

When the push rod moves forward by a predetermined stroke and the brake device operates, the advance of the push rod is stopped. At this time, since the reaction force from the brake device is applied to the push rod, by detecting this with a pressure sensor or the like, it is confirmed that a predetermined braking force has been generated, and the motor 22 is stopped. Also, at this time, the reaction force from the brake device acts in a direction to reversely rotate the screw of the ball screw.
Accordingly, a rotational torque acts on the secondary sleeve 105 from the output shaft 103 to rotate the secondary sleeve 105 in the reverse direction. As a result, when the secondary sleeve 105 is about to rotate in the reverse direction, the loose coil spring 110 whose one end is locked to the secondary sleeve 105 is wound up and reduced in diameter. The wound coil spring 110 firmly secures both the secondary sleeve 105 and the loosening sleeve 107 to fix them together. Thus, the secondary sleeve 105
Reverse rotation is prevented. Therefore, even if the supply of electric power to the motor 22 is stopped, the secondary sleeve 105 and the output shaft 1
03 does not rotate. In this state, the coil spring 110 is pressed against the loosening sleeve 107 with a high surface pressure.

Next, when the motor 22 rotates in a predetermined direction corresponding to the release of the brake, the other end of the coil spring 110
Driven in the loosening direction by the next sleeve 101, the coil spring 110 expands in diameter and loosens. Therefore, the coil spring 110
Is released from the state in which the loosening sleeve 107 is secured. As a result, the secondary sleeve 105 and the coil spring 11
0 becomes rotatable and rotates together with the primary sleeve 101. By the rotation of the secondary sleeve 105, the output shaft 103
Rotate, the screw of the ball screw (not shown) rotates, and the push rod retreats. Also at this time, the rotating coil spring 110 slides at a high speed with respect to the loosening sleeve 107 as a fixed member.

With the operation described above, the grease 13 sealed in the clutch housing 12 (FIG. 1) releases the through-holes 101c and 101g of the primary sleeve 101 shown in FIG. The coil spring 110 is introduced inward through the through hole 108a of the guide 108 and
Is introduced into the groove 107d and the through hole 107e of the loosening sleeve 107 through the inter-strip gap. Further, it is also introduced into the through hole 105f of the secondary sleeve 105. In this way, grease is constantly introduced through the large number of holes. Since each of the primary sleeve 101, the secondary sleeve 105, and the loosening spring guide 108 is a rotating member, grease is scattered to some extent due to centrifugal force. And no grease runs out.

On the other hand, the loosening sleeve 107 as a fixing member
Since the centrifugal force does not act on the groove 107d and the through-hole 107e provided in the above, grease can always be stably stored. The grease accumulated in the groove 107d is
Even if a high surface pressure is applied by tightening the coil spring 110 to the loosening sleeve 107, it is not pushed out of the groove. Further, since the groove 107d extends in the axial direction facing the coil spring 110, and is provided in a plurality in the circumferential direction, the entire sliding surface against the coil spring 110 is evenly lubricated by the grease stored therein. Can be done. Therefore, when the coil spring 110 slides with respect to the loosening sleeve 107 and when the loosening sleeve 1
In any case where the coil spring 110 is pressed against 07 with a high surface pressure, it is possible to reliably hold the grease and prevent the grease from running out.

[0020]

The present invention configured as described above has the following effects. According to the one-way clutch device of the first aspect, the grease can always be stably stored by the groove provided in the fixing member. Further, the grease stored in the groove is not pushed out of the groove even if it receives a high surface pressure due to the fastening of the coil spring to the fixing member.
Therefore, it is possible to reliably hold the grease and prevent the grease from running out.

According to the one-way clutch device of the present invention, since the grease is always supplied stably through the plurality of through holes which can communicate with each other, it is possible to prevent the grease from running out.

[Brief description of the drawings]

FIG. 1 is a sectional view of a service brake mechanism including a one-way clutch device according to an embodiment of the present invention.

FIG. 2 omits a clutch housing from FIG. 1;
It is sectional drawing which expands and shows a one-way clutch.

3A and 3B are diagrams each showing a primary sleeve alone in the one-way clutch, wherein FIG. 3A is a side view including a partial cross section, and FIG. 3B is a view of the primary sleeve in FIG. is there.

4A and 4B are diagrams each showing a secondary sleeve in the one-way clutch as a single unit, wherein FIG. 4A is a view of the secondary sleeve in FIG. 2 viewed from the left side, and FIG. 4B is a view of the secondary sleeve in FIG. FIG.

5A and 5B are diagrams each showing a loosening spring guide alone in the one-way clutch, wherein FIG. 5A is a side view, and FIG. 5B is a view of the loosening spring guide in FIG.

FIG. 6 is a diagram showing a loosening sleeve in the one-way clutch as a single unit, (a) is a plan view or a side view,
(B) is the figure seen from the B direction in (a).

[Explanation of symbols]

REFERENCE SIGNS LIST 1 one-way clutch device 10 one-way clutch 12 clutch housing 13 grease 22 motor 101 primary sleeve (drive-side member) 105 secondary sleeve (driven-side member) 107 loosening sleeve (fixed member) 107d groove 101c, 101g, 105f, 107e, 108a
Through hole 110 Coil spring

Claims (2)

[Claims] A driving member provided in the housing and rotationally driven by a power source; a driven member provided in the housing and rotationally driven by the driving member; A fixed member fixed in the housing; and a coil spring for releasing or fixing the driven member with respect to the fixed member by engaging with the driving member or the driven member to expand and contract a spring diameter. The one-way clutch device according to claim 1, wherein a plurality of grooves for holding grease are provided on a surface of the fixing member facing the coil spring. 2. A method according to claim 1, wherein a predetermined amount of grease is sealed in said housing, and a plurality of through holes for guiding grease are provided in each of said driving side member, driven side member and fixed member. Item 1. The one-way clutch device according to Item 1.