Two-speed planetary transmission
A kind of transmission device and planetary gear technology, which is applied in the direction of transmission device, transmission device control, gear transmission device, etc.
Active Publication Date: 2020-07-17
德冠精密股份有限公司
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Problems solved by technology
However, such a design has the disadvantage that during the production of the toothing by milling, the machining area of the milling cutter is limited in the axial direction, since in particular during milling the milling cutter is inclined relative to the axial direction of the drive shaft collides with the centering element
Method used
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Embodiment Construction
[0014] like figure 1 As shown, a planetary gear 12 is accommodated in the housing 10 , which can be shifted via a shifting mechanism 14 mounted on the housing 10 , for example with a The electric motor of the transmission acts as the actuator.
[0015] The two-stage planetary transmission 12 has a hollow sleeve 30 with an axial bore 16 for non-rotatably receiving the drive shaft, which is thereby connected to the sun gear 18 , and a coaxial output shaft 20 with the A planet carrier 22 is connected, from which two planet wheels 24 can be identified. The two planet wheels mesh with the inner diameter 26 of the ring gear 28 .
[0016] The sleeve 30 has an external toothing 32 on which a selector sleeve 34 is axially displaceable by means of an internal toothing 36 (cf. Figures 2 to 5 ). As mentioned, the shifting bush 34 can be moved axially by means of an electric motor with transmission arranged in the shifting mechanism 14 . A ball bearing 38 is used for supporting the s...
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The present invention relates to a two-speed planetary transmission. The two-speed planetary transmission (12) of the present invention comprises: a drive shaft having a sun gear (18) connected to the transmission; an output shaft (20) sharing the same axis with the drive shaft to be connected to a planetary gear carrier (22); a ring gear (28) having an internal sawtooth unit (26) engaged with planetary gears (24); and a shifting sleeve (34) which can be displaced from a first gear shift position, which connects a housing (10) of the planetary transmission (12) and the ring gear (28), to a second gear shift position, which connects a hub (30) and the ring gear (28), in an axial direction on the hub (30) of the drive shaft having the external sawtooth unit (32) and on an external sawtooth unit (42) of the ring gear (28). The transmission of the present invention also has a means for centering of the shifting sleeve (34), which can be displaced on the hub (30). As such, the means for centering in the present invention have a loose inserting centering gap (56) in between tooth tip units (32) of the hub (30) and tooth root units (52) of the shifting sleeve. The centering gap is shorter than 0.1 mm, and is desirably between 0.05 and 0.07 mm. The present invention aims to provide a planetary transmission to prevent a milling process during manufacturing of the external sawtooth unit of the hub from being interfered with in an axial direction and to prevent centering characteristics in between the hub and the shifting sleeve from decreasing.
Description
technical field [0001] The invention relates to a two-speed planetary transmission. Such shifting transmissions are used, for example, in machine tools in which the transition from direct gear (i=1) to Shifts with ratio i≠1 (mostly enter low speed). The shifting takes place here via an axially displaceable shifting bush, which is also referred to as a catch shifting bush and is connected to the ring gear via an internal toothing. The housing or sleeve of a planetary gear. Background technique [0002] In modern machine tools, such as lathes or milling machines, the requirements regarding rotational speed, vibration and precision are very high. For this reason, it is necessary to minimize the unbalance in the planetary gear in order to be able to carry out machining of the workpiece surface as accurately as possible. [0003] The subject matter of DE 103 48 755 A1 is a planetary transmission, in which a centering element (Zentrierbund) is formed in order to center a displ...
Claims
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IPC IPC(8): F16H3/44F16H59/02
CPCF16H3/44F16H59/02F16H2306/00F16D11/14F16D2011/004F16D2011/008F16H3/54F16H63/30F16H2063/3093F16H2200/0034F16H2200/2005F16H2200/2035F16H2200/2064F16H2200/2094
Inventor C.特里恩德尔
Owner 德冠精密股份有限公司