A motive power transmission device including first and second motive power transmission members that are spline-fitted together includes a spring retaining member that retains a spring and is mounted on the first motive power transmission member. The spring retaining member includes a temporarily fixing portion that is temporarily fixed to and mounted on the first motive power transmission member in a first compression state of the spring and a locking portion that is locked with the second motive power transmission member in a second compression state where when the first and second motive power transmission members are spline-fitted together, the spring is compressed and urges the second motive power transmission member toward one side in a circumferential direction with respect to the first motive power transmission member.

A shaft assembly for an aircraft engine includes a first shaft coupled to a second shaft with a splined coupling made of an electrically-insulating material. The first and second shafts and the splined coupling are rotatable about an axis. A positioning device is mounted to the splined coupling and to the first shaft about the axis. The positioning device is displaceable along the axis relative to the first shaft to vary an axial position of the splined coupling.

A dielectric insulating insert assembly arranged to be positioned between a drive shaft and a driven shaft of a motorised drive assembly. The insert includes a body of dielectric material to form an insulating layer and having a non-circular cross-section and configured to engage, respectively, with the drive shaft and the driven shaft in torque transfer engagement, the insulating layer providing a dielectric barrier between the drive shaft and the driven shaft.

An electrically isolated coupler includes a drive body, a driven body, an insulating member and an isolation coating. The drive body is made of first metallic material and has a drive end configured to interface with a fastening component. The drive body includes a first interface portion and the driven body includes a second interface portion. The driven body is made of a second metallic material and has a driven end configured to interface with a driving tool. The insulating member is molded to fit between the drive body and the driven body to electrically isolate the drive body and the driven body from each other. The isolation coating is disposed on a surface of the first interface portion or the second interface portion that contacts the insulating member and faces the second interface portion or the first interface portion, respectively. The isolation coating includes a material that adheres to metal and has a dielectric strength of greater than about 10 kV.

A dielectric insulating insert arranged to be positioned between a drive shaft and a ball shaft of a motorised ball valve assembly. The insert includes a body of dielectric material to form an insulating layer and having opposing sides from each of which extends an engagement portion having a non-circular cross-section and configured to engage, respectively, with the drive shaft and the ball shaft in torque transfer engagement.

Embodiments are directed to a drive shaft apparatus comprising a first rotary member and a second rotary member arranged coaxially with said first rotary member. The rotary members are fixedly connected at a first end so that they rotate together. Each rotary member has a set of elements spaced apart around its circumference at a second end. The elements on the first rotary member are spaced apart from the elements on the second rotary member at rest. The first rotary member undergoes torsion when a load is applied during rotation, which causes the first rotary member elements to move closer to the second rotary member elements. The first elements engage the second elements when a torque load less than a yield torque is applied to the first rotary member, which transfers at least a portion of the torque load to the second rotary member.

A torque converter is configured to connect with an electric machine via a connecting assembly. The torque converter includes a front cover facing the electric machine. The connecting assembly is non-rotatably fixed to the front cover to be coaxial with a rotor shaft of the electric machine. The connecting assembly defines axially extending teeth configured to engage the electric machine.

A split shaft is disclosed. The split shaft includes a proximal shaft section having a first proximal shaft end and a second proximal shaft end. The first proximal shaft end is configured to couple to the first machine arrangement. The split shaft further includes a distal shaft section having a first distal shaft end and a second distal shaft end. The first distal shaft end is configured to couple to the second machine arrangement. The second distal shaft end is configured to engage with the second proximal shaft end to convey the drive power from the first machine arrangement to the second machine arrangement. The second proximal shaft end includes a first indicator, and the second distal shaft end includes a second indicator. Alignment of the first indicator and the second indicator conveys timing for the drive power.

A traveling device (11) is provided with an electric motor (16) provided in a vehicle body (2) of a dump truck (1), an output shaft (17) an axial base end of which is connected to the electric motor (16) and which outputs rotation of the electric motor (16), a bottomed hole spline (53) formed in an axial front end of the output shaft (17), and an input shaft (42) which has a shaft spline (54) spline-coupled to the hole spline (53), and inputs the rotation of the output shaft (17) to a reduction gear mechanism (27). The output shaft (17) is provided with an oil reservoir space (55) formed in the innermost part of the hole spline (53), an annular oil groove (56) and an oil path (57) providing communication between the oil reservoir space (55) and the annual oil groove (56). Lubricant oil (100) supplied to the annular oil groove (56) is supplied via the oil path (57) to the oil reservoir space (55), and is supplied to a spline joint between the hole spline (53) and the shaft spline (54) with rotation of the output shaft (17).

An electrically isolated coupler includes a drive body, a driven body, an insulating member and an isolation coating. The drive body is made of first metallic material and has a drive end configured to interface with a fastening component. The drive body includes a first interface portion and the driven body includes a second interface portion. The driven body is made of a second metallic material and has a driven end configured to interface with a driving tool. The insulating member is molded to fit between the drive body and the driven body to electrically isolate the drive body and the driven body from each other. The isolation coating is disposed on a surface of the first interface portion or the second interface portion that contacts the insulating member and faces the second interface portion or the first interface portion, respectively. The isolation coating includes a material that adheres to metal and has a dielectric strength of greater than about 10 kV.