Abstract: In this paper, based on the existing parallel hydraulic retarder, three kinds of retarder drive gear and passive gear with different gear input growth ratio of 2.0, 2.03 and 2.138 were designed respectively. A sample box for retarder external characteristics experiment was assembled to study the influence of input gear growth ratio on retarder braking torque performance. According to the existing experimental data of retarder, the speed ratio and braking torque curve of retarder are satisfied by theoretical calculation and design. Experimental results show that gear growth by increasing retarder ratios low speed range solve retarder braking torque smaller problems, to satisfy the market now keeping small demand, driving axle model matching retarder can be realized by limiting torque control method and the high speed smooth braking torque output, regional retarder to competing goods abroad.

Key words: Parallel hydraulic retarder; Gear growth ratio; Brake torque; Torque performance

摘要： 基于现有并联液力缓速器，分别设计 2.0、2.03、2.138 三种不同齿轮增速比的缓速器 驱动齿轮和被动齿轮，并装配样箱进行缓速器外特性实验，研究齿轮增速比对缓速器制动扭 矩性能的影响。根据现有缓速器实验数据，通过理论计算，设计满足整车匹配缓速器所需的 缓速器齿轮增速比及对应缓速器制动扭矩曲线。实验表明，可通过增大缓速器齿轮增速比来 解决缓速器低转速区间段制动扭矩较小问题，进而满足市场上大马力小后桥车型匹配缓速器 的需求，并可通过限制扭矩控制方法实现高转速区域缓速器制动扭矩的平稳输出。

关键词: 并联液力缓速器；齿轮增速比；制动扭矩；扭矩性能