# Wedge Design and Dynamic Characteristics Analysis of Unequal-Length Wedge Slant Support Clutch
## 5 Dynamic Characteristic Testing Experiment  
By comparing the data in Sections 3.2 and 4.2, it can be observed that the differential engagement performance of the slanted support clutch with six E wedges was superior; therefore, the slanted support clutch was selected for the experiment. The unequal-length wedge slant support clutch was composed primarily of nine original wedges, six No. 5 wedges, a cage, the inner ring of the clutch, end caps on both sides, the outer ring of the  
\begin{table}
\begin{tabular}{c c c c} \hline \hline \multirow{2}{*}{**Wedge**} & \multicolumn{2}{c}{**Critical Disengagement Speed (rpm)**} & \multirow{2}{*}{**Change Rate (\%)**} \\ \cline{2-3} \cline{5-5}  & **Min** & & **Max** \\ \hline Baseline & 12,111.55 & 12,801.28 & 0\% \\ A & 12,287.73 & 12,996.79 & 1.53\% \\ B & 12,377.38 & 13,096.44 & 2.32\% \\ C & 12,455.76 & 13,183.66 & 3.00\% \\ D & 12,635.14 & 13,383.56 & 4.57\% \\ E & 12,764.48 & 13,528.00 & 5.70\% \\ \hline \hline \end{tabular}
\end{table}
Table 6: Theoretical critical disengaging speed of wedge block.  
Figure 13: Critical exceeding simulation loading curve.  
clutch, two support springs, and two 6008 zirconia ceramic bearings. The explosion and physical diagrams of the wedge are displayed in Figures 14 and 15, respectively.  
A DC resistance tester was connected to the inner and outer rings of the clutch using an electric brush. The resistance values between the inner and outer rings of the clutch were collected in real time; the sudden change range of the resistance values of the inner and outer rings of the clutch was further subdivided by the target speed of the outer ring of the clutch. Gradually, the load was increased in increments of 10 rpm, and the resistance values between the inner and outer rings were recorded at each speed. The relationship between the resistances of the inner and outer rings of the clutch and the speed of the outer ring was obtained experimentally, as indicated in Figure 16.  
As indicated in Figure 16, the overrunning process of the clutch had a segmented release feature. At approximately 1100 rpm, the resistance between the inner and outer rings increased to greater than 1 \(\Omega\), indicating that the wedge between the inner and outer rings was gradually disengaged. When the outer ring speed reached 1325 rpm to 1420 rpm, the resistance slowly increased from 15 \(\Omega\) to approximately 20 \(\Omega\). When the outer ring speed was 1430 rpm, the resistance demonstrated a geometric increase, increasing to approximately 3000 \(\Omega\) and increasing to approximately 5000 \(\Omega\) at approximately 1500 rpm. Using the analytical method described in Section 4.1 to calculate the clutch model after expansion and contraction, the theoretical values of the theoretical critical detachment speed of the wedge were obtained, as listed in Table 8.  
In summary, the critical disengagement speed of the conventional slant support clutch was approximately 1325 rpm; that of the slant support clutch with an unequal-length wedge was approximately 1430 rpm. In addition, the critical disengagement process of the unequal-length wedge clutch exhibited a segmented effect. The slanted support clutch with an unequal-length wedge had a wider critical disengagement speed range than the  
Figure 14: Exploded view of “slow”-type slant support clutch model.  
Figure 15: Comparison of unequal-length wedge blocks: short wedge block (**left**) and long wedge block (**right**).  
conventional slanted support clutch, and the differential engagement performance was significantly improved.