Method for manufacturing high-reliability unidirectional device

1. The utility model relates to the technical field of automobile starters, in particular to a high-reliability unidirectional device.

Background technique:

2. The one-way device is an important part of the car starter. There are splines on the shaft at the output end of the one-way device, and the gear head can be installed. The one-way device slides back and forth under the action of the shift fork to drive the gear head to mesh and separate from the engine flywheel ring gear. The input end of the unidirectional device cooperates with the reducer to transmit the torque generated by the starter rotor to the gear head. From the structural point of view, the unidirectional device is mainly composed of a sleeve, an outer cover, a hollow shaft, a drive shaft, a roller, a spring, a fork ring, etc. When the starter is working, the electromagnetic switch is first energized to generate electromagnetic attraction, which causes the drive shaft of the electromagnetic switch to move and drives the unidirectional drive shaft (the gear head is fixed on the drive shaft) to move axially to mesh with the engine flywheel ring gear; please refer to the figure 1. As shown in Figure 2, the hollow shaft of the unidirectional device does not move axially. There are oblique splines with odd number of teeth (assumed to be a) on the inner cavity, and the corresponding drive shaft also has splines, divided into 2 sections, the number of teeth in one section is Odd number a, one segment is even number 2a. When assembling, when the drive shaft is inserted to the limit position of the hollow shaft, the odd-numbered teeth of the hollow shaft and the drive shaft can be staggered, and the drive shaft is moved in the reverse direction. At this time, the tooth spline of the drive shaft moves to the odd-numbered a-segment spline of the hollow shaft. When the part is in contact, it can no longer move, thus limiting the maximum distance of the drive shaft.

3. Since the number of teeth of the spline should be 2a, in order to limit the maximum distance of the drive shaft, half of the number of teeth is removed from the inner spline of the hollow shaft, and only half of the teeth of the drive shaft and the hollow shaft work together, thereby reducing the strength of the spline , Increase the amount of swaying of the drive shaft on the hollow shaft, and reduce the performance and reliability of the unidirectional device.

4. The applicant needs to explain that the technical solutions described in the background art are for the convenience of readers to better understand the technical solutions of the present utility model, so the solutions recorded in the background art do not necessarily constitute the prior art.

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