JPS59144826A - One-way clutch - Google Patents

Abstract

PURPOSE:To improve assembly performance and to reduce the number of parts by disposing a bearing surface both on a retainer and an outer race, and providing an elastic body for pressing the bearing surface of the retainer and pressing roller to the wall of a cam chamber opposite to the driving direction. CONSTITUTION:In the initial condition, a retainer 2 is pressed by a spring 4, so that a roller 3 fitted to a projection 2a is pressed to the narrower side of the cam chamber 1b, that is, in the opposite direction to the driving direction to couple a pinion 5 to the retainer. When a starter is started, an armature shaft and a torsion spline 1c are engaged with each other, so that the pinion 5 is advanced to be connected to a link gear. The rotation of the armature shaft is transmitted from the spline 1c to an outer race 1 and further to the retainer 2 coupled to the pinion 5 by the roller 3, so that the pinion 5 rotates the ring gear to start an engine. In this arrangement, the number of elastic bodies for pressing the roller is smaller than the number of the rollers, and before assembling springs for always pressing the rollers, in the condition where the inside diameter is large, parts may be assembled in the inside diameter, which can reduce the number of parts and improve the assembly performance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the structure of a one-way clutch.

Conventional one-way clutches require a spring that constantly presses and connects one roller in a direction opposite to the driving direction for one roller that transmits rotational force during driving. Since the roller is constantly pressed inside the cam chamber, the inner diameter is cramped and the roller cannot be assembled to the inner diameter without compressing the spring.

The present invention aims to improve the ease of assembling a one-way clutch and reduce the number of parts.

That is, it is annular and has one or more protrusions on its lower surface, or has a retainer, a hollow roller attached to the protrusion of the retainer, a cam chamber into which the roller fits, and a retainer and an outer that rotates. In a one-way clutch, the retainer and the outer have a surface, and the retainer has an elastic body between them that presses the surface and presses the roller against the wall of the cam chamber in the direction opposite to the drive direction. It is. .

An example in which the present invention is applied to a starter shown in the drawings will be described below. FIG. 1 is a plan view of the outer 1. FIG. The outer 1 has two receiving surfaces 1a for the spring 4 on the inner periphery, and several cam chambers 1b which are narrow on the side opposite to the driving direction around the hole through which the armature shaft passes.
is engaged with an armature shaft (not shown) in the driving direction by a torsion spline 1c shown in the overall sectional view of FIG. FIG. 2 is a plan view of the retainer 2. FIG. The retainer 2 is annular and has several protrusions 2a on the lower surface of the inner edge to which the rollers 3 are attached.
The spring 4 supports are provided on the outer edge by bending the surface 2b upward at two locations. Figure 3 shows the state in which the inner helical retainer 2 of the outer 1 is assembled, and Figure 4 is a detailed view of the cam chamber 1b when assembled, and the broken line shows the state in which the roller 3 has moved to the wider side of the cam chamber 1b. Retainer 2 is omitted because it is not visible.Roller 3
is a hollow cylinder that fits into the protrusion 2a and has some room for movement in the radial direction with respect to the rotation of the retainer 2. spring 4
The support is located between the surfaces 1a and 2b and presses the retainer 2 at all times. The pinion 5 is connected to the retainer 2 when the roller 3 is on the narrow side of the cam chamber 1b, and idles when the roller 3 is on the wide side.

Next, the operation of the above configuration will be explained. In the initial state, the retainer 2 is pressed by the spring 4, so the roller 3 that fits into the projection 2a is pressed toward the narrow side of the cam chamber 1b, that is, the side opposite to the driving direction, and the pinion 5
are connected. When the starter is started, an armature shaft (not shown) and a torsion spline IC are engaged, and the pinion 5 moves forward and is connected to a ring gear (not shown). The rotation of the armature shaft is transmitted from the helical spline IC to the outer 1, and then transmitted to the retainer 2 connected to the pinion 5 by the roller 3, and the pinion 5 turns the ring gear to start the engine.

When the engine ignites and the rotation of the pinion 5, which is rotated by the ring gear, becomes faster than the rotation of the outer 1, the spring 4 is compressed, and the roller 3, which had been pressed against the narrow side of the cam and chamber 1b, is moved as shown by the broken line in Fig. 4. Moving to the wider side of the cam chamber 1b shown, the pinion 5 is connected.

I'm deterred. In this way, the pinion 5 is uncoupled and spins idly, so that the starter does not overrun. When the pinion 5 separates from the ring gear and the rotation of the pinion 5 decreases, the roller 3 is again pressed against the narrow side wall of the cam chamber 1b by the pressure of the spring 4, connecting the pinion 5 and returning to the initial state.

In the assembly structure of the above embodiment, the number of springs 4 is smaller than the number of rollers 3, and after the assembly of the springs 4, the fourth
If the roller 3 is moved closer to the wider side of the cam chamber 1b as shown by the broken line in the figure, the inner diameter will become wider, making it easier to insert the pinion 5.

Also, since the force applied to each protrusion 2a is about 1 kg, iron material is sufficient.

In addition, there are the following as other embodiments of the present invention.

The spring 4 is a plate spring instead of a spiral spring.

The surface 1a of the spring 4 receiver is dug into a portion of the outer 1 where the cam chamber 1b is not provided, and the surface 2b of the receiver is provided on the same side as the protrusion 2a.

Assume that the positions of outer 1 and retainer 2 are swapped. That is, the cam chamber 1b is provided in the part fixed to the pinion 5,
It is assumed that a retainer 2 to which rollers 3 are attached is provided at a location of the outer 1.

Furthermore, the unidirectional Kura Nochi of the present invention can be used for purposes other than starters.

As described above, according to the present invention, the number of elastic bodies that press the rollers is less than the number of rollers, and the spring that constantly presses the rollers can be installed, and the inner diameter can be moved in a wide inner diameter state. Since parts can be assembled, it has the advantage of reducing the number of parts and improving ease of assembly.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the outer of the present invention, FIG. 2 is a plan view of the retainer of the present invention, FIG. 3 is an assembly diagram of the retainer and outer of the present invention, FIG. 4 is a detailed view of the cam chamber, and FIG. The figure is a cross-sectional view of the entire structure. ■... Outer, 1a... The receiver is a surface, 1b... Cam chamber, 2... Retainer, 2a... Protrusion, 2b... The receiver is a surface, 3... Roller, 4... ·spring. Representative Patent Attorney Takashi Okabe

Claims (1)

[Claims] A unidirectional clutch comprising an annular retainer with one or more protrusions on its lower surface, a hollow roller attached to the protrusion of the retainer, a cam chamber in which the roller is placed, and an outer that rotates with the retainer. In the above, a receiver provided on the retainer and the outer is an elastic body that is located between the surfaces, and the receiver of the retainer always presses the surface and presses the roller against a wall in a direction opposite to the driving direction in the cam chamber of the outer. One-way clutch with.