Force transmission assembly and a control assembly including such an assembly
The invention relates to a force transmission unit ( 1 ), particularly enabling the transmission of forces between a lever and a steering member, including: —a force transmission device ( 8 ) comprising a shaft ( 81 ) defining a central axis (X-X), and—a force accompanying device ( 3 ) comprising: —a cam ( 71 ), the shaft and the cam being suitable for being rotatably mobile in relation to one another, —a push member ( 6 ) suitable for engaging with the cam and for translating along the shaft, and—and a resilient member ( 9 ) suitable for working under compression during a translation movement of the push member ( 6 ), said translation movement being caused by activating the transmission unit. The push member ( 6 ) includes, at the same time, a body ( 68 ) designed for receiving cam followers ( 621; 622 ) suitable for engaging with the cam ( 71 ), and a linear bearing ( 64 ) arranged in the body, the bearing being suitable for engaging with the shaft ( 81 ).
1. A force transmission assembly, for transmitting forces between an input and an output, the force transmission assembly comprising:
a force transmission device including a stationary shaft defining a central axis; and
a force-accompanying device including:
a cam being movable in rotation about the shaft;
a pusher mounted about the shaft to be movable in translation along the shaft with the cam and which pusher includes a body having cam rollers mounted thereto so as to be engaged with and movable relative to a cam path of the cam, and a ball bushing secured within the body and about the shaft, the ball bushing being engaged with the shaft so as to be fixed from rotation about the shaft and to be movable in translation with the body along the shaft; and
a resilient member mounted about the shaft so as to be compressible by the pusher to thereby exert force to engage the cam rollers against the cam path.
2. The transmission assembly according to claim 1 , wherein the shaft includes grooves, the ball bushing being movable in translation relative to the shaft along the grooves.
3. The transmission assembly according to claim 1 , wherein the ball bushing is provided with races in which balls are mounted, which races are bullet-shaped.
4. The transmission assembly according to claim 3 , wherein the shaft includes grooves and wherein each of the grooves has a bullet-shaped profile and are disposed facing the races, such that the balls of the ball bushing move in translation within the grooves.
5. The transmission assembly according to claim 1 , wherein the body of the pusher includes a first support for supporting a first end of the resilient member, the first support being secured to a second support provided with an opening adapted to receive a key in order to secure the body relative to the ball bushing.
6. The transmission assembly according to claim 5 , wherein the shaft is provided with a substantially annular abutment support for supporting a second end of the resilient member.
7. The transmission assembly according to claim 1 , wherein the cam path has a profile that is at least in part linear.
8. The transmission assembly according to claim 1 , wherein the cam path has a profile that is at least in part curved.
9. The transmission assembly according to claim 1 , wherein the cam path has a profile that includes portions having different slopes.
10. A control assembly comprising a lever, a direction control member, and a force transmission assembly for transmitting a force imparted by the lever to the direction control member, the force transmission assembly being a force transmission assembly according to claim 1 .
11. A force transmission assembly, for transmitting forces between an input and an output, the force transmission assembly comprising:
a force transmission device including a shaft defining a central axis about which the shaft rotates; and
a force-accompanying device including:
a stationary cam, the shaft being movable in rotation within the cam;
a pusher mounted about the shaft so as to be driven in rotation by the shaft and to be movable in translation along the shaft and which pusher includes a body having cam rollers mounted thereto so as to be engaged with and movable relative to a cam path of the cam, and a ball bushing secured within the body and about the shaft, the ball bushing being engaged with the shaft so as to be fixed from rotation about the shaft and to be movable in translation with the body along the shaft; and
a resilient member mounted about the shaft so as to be compressible by the pusher to thereby exert force to engage the cam rollers against the cam path.
12. The transmission assembly according to claim 11 , wherein the shaft includes grooves, the ball bushing being movable in translation relative to the shaft along the grooves.
13. The transmission assembly according to claim 11 , wherein the ball bushing is provided with races in which balls are mounted, which races are bullet-shaped.
14. The transmission assembly according to claim 13 , wherein the shaft includes grooves and wherein each of the grooves has a bullet-shaped profile and are disposed facing the races, such that the balls of the ball bushing move in translation within the grooves.
15. The transmission assembly according to claim 11 , wherein the body of the pusher includes a first support for supporting a first end of the resilient member, the first support being secured to a second support provided with an opening adapted to receive a key in order to secure the body relative to the ball bushing.
16. The transmission assembly according to claim 15 , wherein the shaft is provided with a substantially annular abutment support for supporting a second end of the resilient member.
17. The transmission assembly according to claim 11 , wherein the cam path has a profile at least in part linear.
18. The transmission assembly according to claim 11 , wherein the cam path has a profile that is at least in part curved.
19. The transmission assembly according to claim 11 , wherein the cam path has a profile that includes portions having different slopes.
20. A control assembly comprising a lever, a direction control member, and a force transmission assembly for transmitting a force imparted by the lever to the direction control member, the force transmission assembly being a force transmission assembly according to claim 11 .