quadruped_ros2_control/descriptions/deep_robotics/lite3_description/xacro/transmission.xacro

<?xml version="1.0"?>

<robot xmlns:xacro="http://www.ros.org/wiki/xacro">

  <xacro:macro name="leg_transmission" params="name">
    <transmission name="${name}_HipX_tran">
      <type>transmission_interface/SimpleTransmission</type>
      <joint name="${name}_HipX">
        <hardwareInterface>hardware_interface/EffortJointInterface</hardwareInterface>
      </joint>
      <actuator name="${name}_HipX_motor">
        <mechanicalReduction>1</mechanicalReduction>
      </actuator>
    </transmission>
    <transmission name="{name}_HipY_tran">
      <type>transmission_interface/SimpleTransmission</type>
      <joint name="{name}_HipY">
        <hardwareInterface>hardware_interface/EffortJointInterface</hardwareInterface>
      </joint>
      <actuator name="{name}_HipY_motor">
        <mechanicalReduction>1</mechanicalReduction>
      </actuator>
    </transmission>
    <transmission name="{name}_Knee_tran">
      <type>transmission_interface/SimpleTransmission</type>
      <joint name="{name}_Knee">
        <hardwareInterface>hardware_interface/EffortJointInterface</hardwareInterface>
      </joint>
      <actuator name="{name}_Knee_motor">
        <mechanicalReduction>1</mechanicalReduction>
      </actuator>
    </transmission>
  </xacro:macro>

</robot>