JP2010175010A - Ratchet type one-way clutch and claw member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ratchet type one-way clutch capable of suppressing impact noise when a claw member is fitted with a rack in the ratchet type one-way clutch wherein a substantially ring-like space is formed between an outer ring and an inner ring coaxially journaled so as to be relatively rotated, a plurality of the claw members are arranged in the prescribed pitches in the substantially ring-like space so that the clutch can be rotated only to one direction. <P>SOLUTION: The claw member 6 is attached to a ring-shaped ribbon spring, spring force to press a distal end side of the claw member to a rack side is energized by a pressing piece formed on the ribbon spring, the claw member has a structure wherein a metal claw and a resin base are connected, and a distal end of the base is slightly protruded from a distal end of the claw. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ratchet type one-way clutch using a ratchet as a lock mechanism so as to rotate only in one direction, and a claw member constituting the ratchet type one-way clutch.

  One-way clutches used in automatic transmissions have outer and inner rings that rotate relative to each other, and sprags and rollers that transmit torque between the outer ring and the inner ring mesh with a cam surface provided on the raceway of the outer ring or inner ring. Thus, rotational torque is transmitted only in one direction. And it is the structure which idles in the reverse direction.

  Among such one-way clutches, there is a ratchet type one-way clutch using a ratchet as a torque transmission member that transmits torque between an outer ring and an inner ring. The ratchet type one-way clutch has an outer ring having a recess on the inner periphery, an inner ring arranged coaxially with the outer ring and having a rack on the outer periphery, and is engaged with the rack of the inner ring housed in the recess to lock the one-way clutch. A claw member that transmits torque between the inner ring and the outer ring, and an elastic body such as a spring that urges the claw member toward the inner ring.

  Therefore, when the ratchet type one-way clutch rotates in one direction, the claw member slides freely with respect to the outer periphery of the inner ring, so that the outer ring and the inner ring idle relatively. However, if it tries to rotate in the opposite direction, the claw member engages with the rack, and the one-way clutch is locked.

  Thus, the ratchet type one-way clutch is disposed in the recess so as to engage with the inner ring (or outer ring) having a plurality of racks (notches), the outer ring (or inner ring) having a plurality of recesses, and the rack. A claw member and a spring for directing the claw member to the engagement position are provided. By the way, the ratchet type one-way clutch is incorporated in the transmission and is made of metal parts so that it can withstand the torque input. Therefore, an impact sound is generated when the idling state is changed to the locked state, and noise may be a problem when the ratchet type one-way clutch is employed in the vehicle.

The “ratchet type one-way clutch” according to Japanese Patent Application Laid-Open No. 2002-5201 is intended to prevent impact noise caused by backlash, reduce noise, reduce impact when meshing with a claw member and a recess, and improve life. Yes.
Therefore, an inner ring and an outer ring that are provided on the same axis and are arranged so as to be relatively rotatable, a claw member that is disposed between the inner ring and the outer ring and that fits into a concave portion on the outer periphery of the inner ring and transmits torque, and the claw member is disposed in the concave portion. And a means for absorbing an impact generated when fitting.
Here, as a means for absorbing the impact, a plate spring formed into a predetermined shape is used as is apparent from the accompanying drawings of the same patent publication, and the claw member is constrained by the plate spring. It is considered that the effect of suppressing the impact sound when the made claw member is fitted into the metal recess is small.

“Ratchet one-way clutch and stator using ratchet one-way clutch” disclosed in Japanese Patent Application Laid-Open No. 2003-56605 absorbs an impact generated when a claw member is fitted in a recess, and suppresses vibration and impact sound. It is.
That is, an inner ring and an outer ring arranged on the same axis are provided, a claw member for transmitting torque to one of the inner ring and the outer ring, and a biasing member for biasing the claw member are arranged, and the claw member is fitted to the other. A ratchet one-way clutch provided with a recess is provided with an impact absorbing member for absorbing or buffering an impact generated when the claw member is fitted into the recess.

The impact absorbing member is made of rubber, so that the impact when the claw member fits into the recess will be absorbed, but it will be a separate part other than placing the claw member between the outer ring and the inner ring. A shock absorbing member must be installed.
"Ratchet type one-way clutch" according to Japanese Patent Application Laid-Open No. 2002-5201 “Ratchet one-way clutch and stator using ratchet one-way clutch” according to Japanese Patent Application Laid-Open No. 2003-56605

  Thus, the conventional ratchet type one-way clutch has the above-mentioned problems. The problems to be solved by the present invention are these problems. The claw member generates almost no impact sound when it engages with the rack (recess), and the structure is simple. A ratchet type one-way clutch that can be easily assembled between inner rings, and a claw member constituting the ratchet type one-way clutch are provided.

  The one-way clutch according to the present invention is a ratchet type one-way clutch, and forms a substantially ring-shaped space between an inner ring and an outer ring that are mounted concentrically, and a plurality of claw members are arranged in this space. Yes. Recesses (concave portions) are provided at a constant pitch on the inner periphery of the outer ring, and racks (notches) are formed at a constant pitch on the outer periphery of the inner ring, and the plurality of claw members are attached to a ring-shaped ribbon spring. At the same time, the head can fit into the recess and the tip can engage the rack.

  On the other hand, the arrangement form of the claw members may be reversed, and racks (notches) may be provided at a constant pitch on the inner periphery of the outer ring, and depressions (recesses) may be formed at a constant pitch on the outer periphery of the inner ring. The plurality of claw members attached to the ring-shaped ribbon spring can be fitted into the recesses, and the tips can be engaged with the rack.

  By the way, the claw member is composed of a metal claw and a resin base, a base is provided at the bottom of the claw, and the tip of the base slightly extends from the tip of the claw. The head of the claw member fits in the recess, and the tip engages with the rack, but the tip of the base extending from the claw hits the bottom of the rack, and when the load is applied and the tip of the base is compressed, the claw tip comes to the bottom of the rack. Abut.

  The claw member is attached to a ring-shaped ribbon spring and is pressed by a pressing piece formed on the ribbon spring, and the spring force is urged so that the tip engages with the rack. Here, the shape of the pressing piece formed on the ribbon spring is not particularly limited, but is formed integrally with the ribbon spring. On the other hand, in the ratchet type one-way clutch of the present invention, a plurality of claw members may be directly arranged in a substantially ring-shaped space formed between the inner ring and the outer ring without attaching claw members to the ribbon spring.

  When the ratchet type one-way clutch rotates in one direction, the claw member slides freely with respect to the outer periphery of the rack, so that the outer ring and the inner ring rotate relatively. However, if it tries to rotate in the opposite direction, the claw member engages with the rack, and the one-way clutch is locked. Therefore, the one-way clutch can be locked and torque can be transmitted between the inner ring and the outer ring, and a pressing piece that presses the tip of the claw member to engage the rack is formed integrally with the ribbon spring. is doing. Of course, even if the claw member is not attached to the ribbon spring, it functions sufficiently as a one-way clutch.

  The claw member is composed of a combination of a metal claw and a resin base, and since the tip of the base slightly protrudes from the claw tip, the claw member is engaged with the rack when locked from the idle state. When mating, the tip of the base comes into contact with the bottom of the rack. After that, when the torque acts, the protruding resin base tip is compressed and receives a load by the claw, but the impact is alleviated and the impact sound is suppressed by engaging the base tip first. .

  The claw member of the present invention has an integrated structure in which a metal claw is combined with a resin base, i.e., the claw member is integrated with a cushioning material. Can be achieved. That is, it is not necessary to attach an impact absorbing member in addition to the claw member, and the structure of the ratchet type one-way clutch of the present invention is simplified.

  FIG. 1 shows a stator built in the torque converter. The stator incorporates a ratchet type one-way clutch according to the present invention, and has a structure that allows rotation in only one direction. In the drawing, 1 is an outer ring, 2 is an inner ring, 3 is a blade, and blades 3, 3,... Extend radially on the outer periphery of the outer ring 1, and the outer periphery of the blades 3, 3,. 7 is connected. The inner ring 2 is provided with a shaft hole 4, and the inner periphery of the shaft hole 4 is a spline hole in which a spline tooth shape is formed.

  The stator regulates the flow of the working fluid in the torque converter, and the inner ring 2 cannot be rotated by the fixed shaft fitted in the shaft hole 4. When the rotational speed of the turbine runner is low, the working fluid flowing out from the turbine runner changes its direction by hitting the blades 3, 3,... Of the stator and is sent to the blades of the pump impeller. Of course, in this state, the ratchet type one-way clutch is locked so that the blades 3, 3... Do not rotate.

  However, when the rotational speed of the turbine runner increases, the direction of the working fluid flowing out of the turbine runner changes and comes into contact with the rear surfaces of the blades 3, 3. As a result, the ratchet type one-way clutch is released so that the blades 3, 3... Rotate, and the outer ring 1 can idle. As described above, the stator blade is stopped at low speed rotation and rotated at high speed rotation, whereby the working fluid flowing out from the turbine runner can be guided to the pump impeller blade, thereby improving the efficiency of the torque converter.

  By the way, a substantially ring-shaped space 5 is formed between the outer ring 1 and the inner ring 2, and a plurality of claw members 6, 6... Are arranged at equal intervals in the ring-shaped space 5. The outer ring 1 can be idled or locked via 6. Therefore, recesses (recesses) are provided at a constant pitch on the inner peripheral surface of the outer ring 1, and racks (notches) are also formed at a constant pitch on the outer peripheral surface of the inner ring 2.

  FIG. 2 shows the claw member 6 interposed in the ring-shaped space 5. The head 8 of the claw member 6 is fitted in a recess 9 formed on the inner peripheral surface of the outer ring 1, and the tip 10 is engaged with a rack 11 formed on the outer peripheral surface of the inner ring 2. This figure is a partially enlarged view showing a single claw member 6, but a plurality of claw members 6, 6... Are arranged at equal intervals in the ring-shaped space 5. Therefore, the claw members 6, 6... Are attached to the ring-shaped ribbon spring 12 and positioned, but are not completely fixed, and the ribbon spring 12 is deformed so that the claw members 6, 6,. It is installed so that its orientation can be changed.

  Here, the inner ring 2 is fixed without rotating, and the outer ring 1 is allowed to rotate in the right direction (clockwise rotation), but cannot be rotated in the left direction (counterclockwise rotation). When the outer ring 1 rotates in the right direction, the claw member 6 slides on the racks 11, 11... Formed on the outer peripheral surface of the inner ring 2 and conversely rotates in the left direction. The claw member 6 is engaged with the rack 11 as shown in FIG. Therefore, leftward rotation of the outer ring 1 is prevented.

  FIGS. 3A and 3B show the claw member 6 alone, where FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is an AA cross-sectional view of FIG. As shown in the figure, the claw member 6 is composed of a metal claw 13 and a resin base 14. The base 14 covers the bottom of the claw 13, and a band 15 is provided at an intermediate portion to hold the claw 13. It is out. Accordingly, the base 14 and the claw 13 are integrated, and the tip of the base 14 protrudes by a slight length a from the tip of the claw 13. Here, when pressure (load) is applied to the tip of the base, the base 14 is integrally formed with the claw 13 so that the base 14 is not displaced.

  That is, the base 14 and the claw 13 can be integrally manufactured by setting a separately manufactured metal claw 13 in the cavity of the injection mold and pouring molten resin. In this case, by providing a concave groove on the bottom surface of the claw 13 and forming a concave groove at the center, the resin is filled in the concave groove so that the base 14 is fixed to the bottom of the claw 13 and the band 15 is Fixed to side and top. That is, the resin base 14 is fixed to the claw 13.

  4A and 4B are partially enlarged views of the ribbon spring 12, wherein FIG. 4A is a plan view and FIG. 4B is a cross-sectional view. The rectangular holes 16, 16... Pass through the ring-shaped ribbon spring 12 having a certain width, and the claw member 6 can be fitted into the holes 16. A pressing piece 17 is formed on one side of the hole 16 (the tip side of the claw member). The pressing piece 17 has a curved shape that bulges outward and the tip extends inward, and the tip 18 contacts the top surface of the tip of the claw member 6 as shown in FIG.

  By the way, when the outer ring 1 rotates in the right direction (clockwise rotation), the claw member 6 fitted in the recess 9 provided on the inner peripheral surface of the outer ring 1 also rotates with the outer ring 1 in the right direction. The plurality of claw members 6, 6... Attached to the ribbon spring 12 slide on the top surface of the rack 11. In this case, while changing the direction of the top surfaces of the uneven racks 11, 11. It can rotate (while swinging).

  The claw member 6 is pressed inward by the pressing piece 17 formed on the ribbon spring 12, so that when the claw member 6 moves along the upper surface of the rack 11, the front end of the claw member 6 is It is pushed up by the rack, and the pressing piece 17 and the ring-shaped ribbon spring 12 can be deformed to change their directions. The tip side rises along the upper surface of one rack 11 and descends when reaching the next rack 11, and can be rotated to the right while repeating this movement.

  If the outer ring 1 stops and rotates in the counterclockwise direction (counterclockwise), the tip of the claw member 6 is locked to the bottom surface of the rack 11 to prevent the counterclockwise rotation. The bottom surface of the claw member 6 of the present invention is covered with a resin base 14, and the tip of the base protrudes by a slight length a from the tip of the claw. Therefore, when the outer ring 1 rotates in the right direction, it slides on the uneven racks 11, 11..., But the impact is alleviated by the resin base 14 coming into contact with the rack 11.

  Then, when the outer ring 1 rotating to the right stops and rotates to the left, the tip of the claw member 6 engages with the rack bottom. In this case, the resin base tip 19 hits the rack bottom. Therefore, the impact when the claw member 6 engages with the rack 11 and the impact sound accompanying the impact hardly occur. After the engagement, the protruding base tip 19 is compressed and hits with a metal claw tip, and can withstand the load caused by the rotational torque.

  FIGS. 5A and 5B are schematic views showing the operation when the claw member 6 is engaged with the rack 11. (A) is an initial state when the nail | claw member 6 engages with the rack 11, and resin-made base front-end | tips 19 contact | abut to the rack bottom. However, the tip of the pawl 13 does not contact the rack bottom, leaving a clearance a. For this reason, since the metal claw tip does not hit at the moment of engaging with the rack 11, the impact sound accompanying the engagement hardly occurs.

  FIG. 5B shows a state in which engagement of the claw tip is in contact with the rack bottom and the engagement is completed. The base end 19 made of resin hits the bottom of the rack, and the base end 19 is compressed by the subsequent load, so that there is no clearance a remaining between the bottom of the rack and the tip of the metal claw comes into contact. As a result, leftward rotation (counterclockwise rotation) of the outer ring 1 is prevented.

  In the embodiment described above, the recess 9 (concave portion) is formed on the inner peripheral surface of the outer ring 1 and the rack 11 is provided on the outer periphery of the inner ring 2, but it may be configured as a reverse pattern. That is, it is possible to provide a recess in which the head of the claw member 6 fits in the outer periphery of the inner ring 2 and form a rack in which the tip of the claw member 6 engages in the inner periphery of the outer ring 1. On the other hand, in the embodiment, the claw members 6, 6... Are set in the holes 16, 16... Provided in the ribbon spring 12, and the ring-shaped space 5 formed between the outer ring 1 and the inner ring 2 in this state. In the present invention, the claw members 6, 6... Can be directly arranged in the ring-shaped space 5 without using the ribbon spring 12.

The stator provided with the ratchet type one-way clutch concerning the present invention. A claw member interposed in the ring-shaped space between the outer ring and the inner ring. A specific example of a claw member. The elements on larger scale of the ribbon spring which attaches a claw member. The schematic diagram which shows the operation | movement at the time of a nail | claw member engaging with a rack.

DESCRIPTION OF SYMBOLS 1 Outer ring 2 Inner ring 3 Blade 4 Shaft hole 5 Ring-shaped space 6 Claw member 7 Core 8 Head 9 Recess
10 Tip
11 racks
12 Ribbon spring
13 claw
14 base
15 bands
16 holes
17 Pressing piece
18 Tip
19 Base tip

Claims (4)

A substantially ring-shaped space is formed between an outer ring and an inner ring that are coaxially supported so as to rotate relative to each other, and a plurality of claw members are arranged at a constant pitch in the approximate ring-shaped space. A ratchet type one-way clutch that fits the head of the claw member into a recess (concave portion) provided on the inner periphery of the outer ring and can rotate only in one direction so that the tip of the claw member can engage with a rack formed on the outer periphery of the inner ring. The ratchet type one-way clutch according to claim 1, wherein the claw member has a structure in which a metal claw and a resin base are combined, and the tip of the base slightly protrudes from the claw tip. A substantially ring-shaped space is formed between an outer ring and an inner ring that are coaxially supported so as to rotate relative to each other, and a plurality of claw members are arranged at a constant pitch in the approximate ring-shaped space. A ratchet type one-way clutch that fits the head of the claw member into a recess (concave portion) provided on the inner periphery of the outer ring and can rotate only in one direction so that the tip of the claw member can engage with a rack formed on the outer periphery of the inner ring In
The claw member is attached to a ring-shaped ribbon spring, and a spring force that presses the front end side of the claw member toward the rack is urged by a pressing piece formed on the ribbon spring, and the claw member is made of a metal claw. A ratchet type one-way clutch that has a structure in which a base made of resin and resin are combined, and the tip of the base slightly protrudes from the tip of the claw. A substantially ring-shaped space is formed between an outer ring and an inner ring that are coaxially supported so as to rotate relative to each other, and a plurality of claw members are arranged at a constant pitch in the approximate ring-shaped space. A ratchet type one-way clutch that fits the head of the claw member into a recess (concave portion) provided on the outer periphery of the inner ring, and can rotate only in one direction so that the tip of the claw member can engage with a rack formed on the inner periphery of the outer ring. The claw member is attached to a ring-shaped ribbon spring, and a spring force that presses the tip side of the claw member toward the rack is urged by a pressing piece formed on the ribbon spring, and the claw member is made of metal. The ratchet type one-way clutch has a structure in which the claw and the resin base are combined, and the base tip slightly protrudes from the claw tip. A substantially ring-shaped space is formed between the outer ring and the inner ring that are coaxially supported so as to rotate relative to each other, and the rotation is allowed only in one direction by interposing the approximate ring-shaped space. In the ratchet type one-way clutch claw member, the claw member has a structure in which a metal claw and a resin base are combined, and the base end protrudes slightly from the claw end. Claw member.

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