CN2293681Y

CN2293681Y - Small planetary gear reducer

Info

Publication number: CN2293681Y
Application number: CN97205990.3U
Authority: CN
Inventors: 于太明; 赵夕军; 孔庆森; 陆廷相; 王先金
Original assignee: JINMING SPEED REDUCER CO Ltd ZHUCHENG CITY
Current assignee: JINMING SPEED REDUCER CO Ltd ZHUCHENG CITY
Priority date: 1997-01-29
Filing date: 1997-01-29
Publication date: 1998-10-07
Anticipated expiration: 2007-01-29

Abstract

The utility model discloses a small-size speed reducer with a planetary gear in a speed reducing device of a crane, outputting torque via three-level speed reducing transmission. The utility model is characterized in that second-level speed reducing transmission is composed of a sun wheel shaft (10), a connecting disk (8), a pin shaft (18), a speed changing bearing (6) and a first-level low-speed shaft (4). The utility model has the advantages of compact structure, small size, low noise, large speed ratio and large transferring torque, and is suitable for tower cranes below QT25.

Description

Small-sized planet-gear speed reducer

The utility model relates to the speed reducer of hoist, the small-sized planet-gear speed reducer on a kind of specifically hoist.

At present, in small-sized tower crane speed reducer such as the comparatively general QT25 of China, QT20, mostly be the externally-engaged cylindrical gear transmission, such speed reducer speed ratio is little, and transmitting torque is little, volume is big, structure is not compact, the noise height.

The purpose of this utility model provide a kind of QT25 of being suitable for tower crane following, speed ratio is big, transmitting torque is big, volume is little, compact structure, small-sized row amount gear reduction unit that noise is low.

Its scheme is: motor torque is imported by input shaft, export by the one-level lower velocity shaft through first order column gear transmission, after the gearing down of the second level, export from sun wheel shaft, sun wheel shaft, planet wheel, the internal tooth volume, planet carrier and output shaft constitute third level gearing down again, output shaft is surrounded by auxiliary housing outward, gland is fixed on the auxiliary housing lower end, the above part of output shaft is sealed up, it is characterized in that second level gearing down is by the one-level lower velocity shaft, variable-speed bearing, bearing pin, tie-plate and sun wheel shaft are formed, one-level lower velocity shaft input torque, variable-speed bearing slows down the back by bearing pin drive tie-plate running disposed thereon, and be input in the third level gearing down by the sun wheel shaft that links to each other with tie-plate, variable-speed bearing is surrounded by bearing housing outward, the bearing housing upper fixed has step, and tie-plate is surrounded by casing outward, such linkage structure compactness, it is little to take volume, and makes that the speed ratio of this speed reducer is big, can reach about 250.

Planet carrier and output shaft can be structure as a whole, and have so just increased the intensity of output shaft, have reduced the quantity of speed reducer driving component, have improved the stationarity of Gear Planet Transmission structure.

The utility model adopts variable-speed bearing, it integrates the supporting effect of rolling bearing and the speed changing function of speed reducer, significantly shortened Transmitted chains, make the compact structure of this speed reducer, it is little to take volume, also alleviated the weight of speed reducer, and the noise of speed reducer is low when using, the speed ratio of this speed reducer can reach 250 simultaneously, be far longer than the speed reducer of external gear pump transmission, the torque of its output is also significantly greater than the speed reducer of external gear pump transmission, because These characteristics of the present utility model, make it and to be installed in very easily on the minor crane, especially on the tower crane below the QT25.

The contrast accompanying drawing specifies enforcement of the present utility model below.

Fig. 1 is a structural representation of the present utility model.

Shown in Figure 1, from top to bottom, distance is changeed in input shaft 1 input, change distance through first order column gear transmission by 4 outputs of one-level lower velocity shaft, upper bearing bracket 2 supports sealing by bearing 3 with input shaft 1, the below of upper bearing bracket 2 is fixed with step 5, in step 5 is included in one-level lower velocity shaft 4, and by bearings input shaft 1 and one-level lower velocity shaft 4, bearing 3 also supports one-level lower velocity shaft 4, one-level lower velocity shaft 4 connects with variable-speed bearing 6 again, they and bearing pin 18, tie-plate 8, sun wheel shaft 10 is formed the second level and is become fast transmission, one-level lower velocity shaft 4 connects with variable-speed bearing 6 by key, evenly is provided with 6 bearing pins 18 on the variable-speed bearing 6, and bearing pin 18 drives tie-plate 8 runnings, tie-plate 8 is connected with sun wheel shaft 10 downwards, the outer installment of variable-speed bearing 6 has bearing housing 7, and bearing housing 7 is fixed on the below of bearing support 5, and is fixed together with the casing 9 of its bottom; Sun wheel shaft 10 is again as the input end of third level speed change transmission, it and planet wheel 16, internal tooth volume 17, planet carrier 14 and output shaft 13 are formed third level gearing down, planet carrier 14 is a hollow structure, sun wheel shaft 10 is inserted in it, and in this and 16 engagements of three planet wheels, planet wheel 16 is fixed on the planet carrier 14 by pivot pin 15, and and be fixed on internal tooth volume 17 engagements of 11 of casing 9 and auxiliary housinies, and planet carrier 14 is structure as a whole with output shaft 13, the torque of sun wheel shaft 10 inputs like this, from output shaft 13 ends deceleration output, the outside of output shaft 13 is surrounded by auxiliary housing 11, and it and internal tooth volume 17 are fixed together, and are fixed with the gland 12 that seals below auxiliary housing 11, output shaft 13 stretches out from the centre of gland 12, the output torque.

Claims

1, a kind of small-sized planet-gear speed reducer, motor driving input shaft (1), one-level lower velocity shaft (4) by first order column gear transmission drives second level gearing down, drive by sun wheel shaft (10) by sun wheel shaft (10), planet wheel (16), internal tooth volume (17), the third level gearing down that planet carrier (14) and output shaft (13) constitute, the outer auxiliary housing (11) that is surrounded by of output shaft (13), gland (12) is fixed on the lower end of auxiliary housing (11), it is characterized in that second level gearing down is by one-level lower velocity shaft (4), variable-speed bearing (6), bearing pin (18), tie-plate (8) and sun wheel shaft (10) are formed, one-level lower velocity shaft (4) drives variable-speed bearing (6), variable-speed bearing (6) drives tie-plate (8) by bearing pin (18) disposed thereon, the sun wheel shaft (10) that links with tie-plate (8) drives third level gearing down, the outer bearing housing (7) that is surrounded by of variable-speed bearing (6), bearing housing (7) upper fixed has step (5), the outer casing that is surrounded by of tie-plate (8).

2,, it is characterized in that planet carrier (14) and output shaft (13) can be structure as a whole according to the described speed reducer of claim 1.