The application discloses a needle-tooth shell
assembly and a speed
reducer, and solves the problem of high difficulty in needle selection and the problem of speed
reducer failure caused by needle-tooth groove wear in the prior art. The needle-tooth shell
assembly comprises a needle-tooth shell and a needle-tooth sleeve. The needle-tooth sleeve is arranged to be movable on the needle-tooth shell, so that the position of the needle-tooth groove on the needle-tooth sleeve for cooperating with the needle can be adjusted, and the
diameter of the needle-tooth shell is adjusted, so that the needle-tooth groove can be adapted according to the selection of the needle, the problem that the needle engagement top gap is too different from the theory due to the error in the
diameter screening of the needle in the prior art is solved, the purpose of weakening the
adverse effect of the large
diameter fluctuation of the needle on the service life of the speed
reducer is achieved, the
assembly precision of the speed reducer and the service life of the speed reducer are improved, the purpose of reducing the idle
stroke of the speed reducer and the attenuation rate of the stiffness curve is achieved, and the service life of the speed reducer is improved.