JPS5919140Y2 - One-way meshing cam clutch - Google Patents

Description

[Detailed description of the invention] This invention provides an arcuate piece on the inner ring of the dog clutch that protrudes outward due to the centrifugal force generated by its rotation, thereby preventing contact between the cam and the inner ring during idling, preventing wear and durability. The present invention relates to a one-way dog clutch that can improve performance.

For example, conveyor devices such as packet conveyors must be reliably prevented from reversing even in the event of an accident such as a power outage, as well as various machines such as pumps and blowers. One-way dog clutches are often used.

Furthermore, as such a one-way mesh clutch, a one-way mesh clutch in which a large number of cams are arranged between an inner ring and an outer ring is often used due to its advantages such as compactness and reliable operation. As shown in FIGS. 11 and 12, for example, a power clutch has a cam 4 interposed between an outer ring 2 fixed to a stationary member and an inner ring 3 attached to a rotating shaft, which is constantly driven by a spring 5 to rotate the outer ring 2. It is biased in the direction of contacting the sliding surface 6 and the sliding surface 7 of the inner ring 3, and therefore causes wear to the cam 4, the inner ring 3, and the outer ring 2 during idle rotation.

In particular, when the inner ring 3 rotates at high speed, the sliding speed between the cam 4 and the sliding surfaces 6, 7 of the inner ring 3 and outer ring 2 increases, and the lubricant tends to deteriorate due to heat generation, increasing wear and shortening its service life. .

However, using forced lubrication to reduce wear requires expensive equipment and maintenance.

Furthermore, in order to reduce the rotational speed of the inner ring 3, when installing it on a low-speed shaft instead of a high-speed shaft in the power transmission path of the machine, the torque will inevitably increase and a large one-way engagement force clutch must be used. This increases costs and becomes uneconomical.

The purpose of the present invention is to provide a one-way meshing force clutch that can solve the above-mentioned problems by providing an arcuate piece on the inner ring that can push up the cam during high-speed rotation. I will explain based on this.

1 to 10, one-way dog clutch 1 of the present invention
The cam 4 is interposed between the outer ring 2 and the inner ring 3 inserted into the outer ring 2, and the inner ring 3 is provided with an arcuate piece 10.
is installed.

The inner ring 3 is provided with through holes 11 for mounting the rotating shaft, and on the outer periphery, on both sides of the sliding surface 7 that contacts the cam 4, stepped portions 12 for mounting the arcuate piece 10 are separated, and a bearing is provided. 14. A small diameter portion 16 is provided to which the oil seal 15 is attached.

The stepped portion 12 may cooperate with a side surface of the inner ring 17 of the bearing 14 to form a circumferential groove for attaching the guide piece 10.

The cam 4 has pin portions 19 protruding from both ends thereof.
are pivotally supported by retainer rings 9, 9 inserted in contact with the outer ring 20 of the bearing 14.

Note that the retainer rings 9, 9 are kept spaced apart from each other by stays (not shown) fixed using screws 9a, and are prevented from being deformed.

Further, in this embodiment, the upper edge of each retainer ring 9 is cut out at three or more places at equal angular pitches, and a spring piece 20 formed by bending a spring plate into a mountain shape, for example, is screwed into the cutout portion 9b. The frame is passed between the retainer rings 9 and 9.

The top of the spring piece 20 contacts the sliding surface 6 of the outer ring 2 elastically and evenly, and holds the retainer ring 9°9 together with the outer ring 2, and also maintains the relationship between the retainer rings 9, 9 and the outer ring 2. This prevents relative rotation between the two.

In the cam 4, a notch 21 is formed at the upper end of the pin portion 19, and a spring 5 formed by a ring-shaped coil spring is wound around the upper surface of the notch 21.

The cam 4 has upper and lower cam surfaces consisting of arcuate surfaces with large diameter dimensions, and the cam 4 has contact points a and l where it comes into contact with the sliding surface 6 of the outer ring 2 and the sliding surface 7 of the inner ring 3. ) connecting line segment C1
is attached so as to be slightly inclined with respect to the clutch center line C2.

Further, the spring 5 presses the notch 21 in the direction of raising the cam 4, and the cam 4 comes into contact with the sliding surfaces 6 and 7 of the inner ring 3 and outer ring 2, thereby lifting the inner ring in the opposite direction of the inclination of the cam 4. When the cam 3 rotates in the direction of the arrow X, the cam 4 can immediately wedge the outer ring 2 and the inner ring 3 together.

In this embodiment, the arcuate piece 10 is a quarter-part piece of a circular ring, and can be attached to the stepped portion 12.

The arcuate piece 10 has extension parts 24 and 24 formed by cutting off the side surfaces of the arcuate portion 23 at an angle of about 90 degrees at both ends, and the arcuate piece 10 has a spring groove for attaching a spring. 27
are formed continuously.

Further, two guide pins 29, 29 are provided on the sides of the arcuate piece 10 at symmetrical positions.

The guide pin 29 is inserted into a long groove 30 formed on the rising wall surface of the stepped portion 12 of the inner ring 2 and capable of guiding the arcuate piece 10 radially outward.

The arc piece 10 engages with the long groove 30, and at its lower end position, the guide surface 31 on the outer circumference of the arc portion 23 can sink below the sliding surface 7 of the inner ring 3, and at its upper end position, the guide surface 31 can sink below the sliding surface 7. The radius of the guide surface 31 is set so that the guide surface 31 can form a continuous perfect circle around its outer periphery at the protruding position of each arcuate piece 10.

The outer periphery of the extension portion 24 is formed into an arcuate surface d that curves slightly inward to prevent discontinuous projections from occurring when the arcuate piece 10 protrudes. ,
A spring 32 made of a coiled spring is inserted.

The spring 32 constantly presses the arcuate piece 10 and urges the guide surface 31 inwardly, and when the inner ring 3 reaches a predetermined rotation speed or higher, the arcuate piece 10 overcomes the urging force of the spring 32. Can stand out.

Further, in this embodiment, the extension portions 24 of the arcuate pieces 10 are arranged so as to overlap each other with a phase difference of approximately 45° on the left and right sides of the inner ring 3, as shown in FIG.

In the one-way meshing force clutch 1 of the present invention, the rotating shaft is passed through the through hole 11 of the inner ring 3, and the outer ring 2 is fixed to a stationary member.

As the rotating shaft rotates, centrifugal force acts on the arcuate piece 10, which overcomes the contraction force of the spring 32 and moves the pin 29 radially outward beyond the sliding surface 7 of the inner ring 3 to position it at the upper end of the guide groove 30. The guide surface 31 continues to form a perfect circle.

As a result, as both ends of the cam 4 slide on the guide surface 31, the cam 4 rises above the sliding surface 7 of the inner ring 3, breaking the contact therebetween, and completely preventing wear between the inner ring 3 and the cam 4. .

Note that the spring piece 20 is connected to the guide surface 3 of the floating circular arc piece 10.
A frictional resistance greater than the sliding frictional force between the outer ring 2 and the cam 4 is created between the outer ring 2 and the cam 4, thus preventing the outer ring 2 and the cam 4 from slipping.

When the rotating shaft becomes slow or reverses, the arcuate piece 10 is pushed down by the spring 32, the cam 4 and the sliding surface 7 come into contact again, and the wedged connection of the cam 4 prevents the rotating shaft from reversing.

Furthermore, the entire circumference of the arcuate piece 10 becomes a perfect circle in its floating state, which prevents the cam from vibrating during high-speed rotation. They overlap each other, thus preventing vibrations, pulsations, etc. of the cam.

As mentioned above, the one-way meshing force clutch of the present invention is equipped with an arcuate piece that pushes up the cam by centrifugal force, and can prevent the cam from coming into contact with the inner ring and outer ring during high-speed idling, thus efficiently reducing wear and heat generation between them. This can have excellent effects such as extending the life of the cam clutch and improving its durability.

In addition, in the one-way meshing force clutch of the present invention, the arcuate piece can be formed using a metal with excellent wear resistance such as a bearing base metal, and the coefficient of friction can be reduced by providing a fluororesin coating or the like on the guide surface. Moreover, wear can be suppressed.

In addition, by periodically replacing only the arcuate pieces after long-term use, the expensive inner ring, outer ring, cam, etc. can be reused as they are, and maintenance costs can be greatly reduced.

Furthermore, the one-way meshing force clutch of the present invention may be constructed using a plate spring inserted into the lower surface of the arcuate piece 10 in place of the spring 32, and the arcuate piece 10 may be divided into four parts, three parts, or more. It is also possible to form the pin 29, guide groove 30, etc. as a divided piece divided into the above number of pieces.
As long as 0 can be moved in the radial direction, it can be transformed into various forms.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a partially cutaway sectional view taken along line A-A, Fig. 3 is a plan view illustrating an arcuate piece, and Fig. 4 is its front view. Figure 5 is a partial view illustrating the overlapping of the circular arc pieces, Figure 6 is a partial view illustrating the overlap when the circular arc pieces float, and Figure 7 is a partial view illustrating the guide groove of the inner ring. Fig. 8 is a sectional view showing the action of the one-way meshing force clutch shown in Figs. FIG. 11 is a sectional view illustrating a conventional one-way cam clutch, and FIG. 12 is a partially broken sectional view taken along the line CC. 2...Outer ring, 3...Inner ring, 4...
...Cam, 7... Sliding surface of inner ring, 10...
...Circular piece, 31...Guide surface, 32...
·Spring.

Claims (2)

[Scope of utility model registration request] (1) A one-way engagement force clutch in which a cam is interposed between an inner ring and an outer ring disposed on the inner ring, and the inner ring and outer ring are wedged by the cam during relative rotation in one direction, The outer circumference is provided with a guide surface that forms an arc with a radius approximately equal to the circumferential surface of the inner ring, and is biased radially inward by a spring, so that the guide surface normally sinks below the sliding surface of the inner ring, and the inner ring A plurality of circular arc pieces whose guide surfaces protrude approximately concentrically from the sliding surface of the inner ring due to centrifugal force due to rotation are provided around the entire circumference of the inner ring with their ends overlapping each other and non-rotatable. A one-way meshing force clutch characterized by: (2) The one-way mesh clutch according to claim 1, wherein the guide surface of the arcuate piece is coated with a low-friction material.