CN2402871Y

CN2402871Y - Differential gear reduction unit

Info

Publication number: CN2402871Y
Application number: CN00219058U
Authority: CN
Inventors: 胡敖荣; 胡志良
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-01-05
Filing date: 2000-01-05
Publication date: 2000-10-25
Anticipated expiration: 2010-01-05

Abstract

The utility model relates to a differential gear speed reducer which has a big case body, a bearing, an input shaft supported on the big case body and an output shaft; a small rotatable case body is in the big case body, one side of the small case body is fixedly connected with a speed ratio fixed gear, a differential gear which can do cycle movement around an output gear on the output shaft is in the small case body, and a speed ratio differential gear is in the big case body; the speed ratio fixed gear is one or a plurality of teeth less or more than the speed ratio differential gear, and the tooth ratio of a first and a second driving gears which are respectively engaged with the speed ratio fixed gear and the speed ratio differential gear is one to two. The utility model has large speed reduction ratio, output torque and stable output power.

Description

The differential gear speed reducer

The utility model relates to a kind of speed reducer, particularly a kind of differential gear speed reducer.

In various transmission devices, need that all the high rotating speed of motor prime movers is reduced to low speed and turn round greatly and refuse output, operating various mechanisms, as the rotation of valve opening and closing, the rotation of wheel cabin etc.But general gear reduction unit, because structural limitations, the single-stage speed ratio can not be too big, thereby, must use multi-stage speed-reducing, for reaching 1: 100 or bigger speed ratio for satisfying the demand, will be with three grades or more multistage, thus make the speed reducer volume very huge, very heavy.The speed reducer that has uses differential mode to slow down, but it is to utilize the tooth difference between rigidity gear ring and flexible gear ring to slow down, can accomplish that the single-stage speed ratio rises reaches 100, but owing to will use flexible gear ring, flexible at work gear ring constantly is out of shape, thereby to the technical requirements height of flexible gear ring, and is subjected to the restriction of flexible gear ring tooth intensity, output torque can not be too high, and output power is also unstable simultaneously.

The purpose of this utility model provides a kind of differential gear speed reducer, and it has very big reduction speed ratio and output torque, and has stable output power.

The technological scheme that realizes above-mentioned purpose is: a kind of differential gear speed reducer, and have big casing and bearing, and be bearing in input shaft and output shaft on the big casing, be fixedly connected with first driving gear and driving gear on the input shaft; Also be supported with intermediate propeller shaft in the big casing, the driving gear that is fixedly connected with second driving gear on this intermediate propeller shaft and is meshed with driving gear on the input shaft; Also be supported with the ratio differential gear shaft in the big casing, be fixedly connected with the ratio differential gear that is meshed with second driving gear on this ratio differential gear shaft; Also has the small box that can be rotated to support on the bearing in the big casing, one side of small box is fixedly connected with the speed ratio fixed gear with the engagement of first driving gear, and be supported with the ratio differential gear shaft, opposite side is supported with output shaft, in small box, the axle head of ratio differential gear shaft is fitted with ratio differential gear shaft gear, and the axle head of output shaft is fitted with output gear; Also be supported with two or four differential gear axles in the small box, all be fitted with a differential gear on the every differential gear axle, differential gear had not only meshed with ratio differential gear shaft gear shaft gear engagement but also with output gear; The speed ratio fixed gear has Z1 tooth, and the ratio differential gear has Z2 tooth, and Z1 and Z2 differ 1 tooth or number tooth, and first driving gear has Z3 tooth, and second driving gear has Z4 tooth, and the ratio of Z3 and Z4 is 1: 2.

After adopting technique scheme, because the number of teeth of first driving gear is two times of the second driving gear number of teeth, the number of teeth of speed ratio fixed gear and ratio differential gear can be set at and differ a tooth, thereby make speed ratio fixed gear revolution cross a commentaries on classics, output gear only turns over a tooth, the rotating speed of output shaft is the number of teeth/one's of speed ratio fixed gear a rotating speed, in addition, also there are a speed ratio in first driving gear and speed ratio fixed gear, the total speed ratio of input shaft and output shaft is that two gear-stage velocity ratios are long-pending, thereby can obtain very big reduction speed ratio and output torque.Simultaneously, so owing to all be that rigid transmission between gear and the gear can obtain stable output power.

Below in conjunction with accompanying drawing the utility model is described in further detail.

Fig. 1 is first kind of embodiment's of the utility model a cross-sectional schematic;

Fig. 2 is the A-A sectional view of Fig. 1;

As shown in Figure 1, 2, a kind of differential gear speed reducer has big casing 14 and bearing 12, and is bearing in input shaft 1 and output shaft 13 on the big casing 14, is fixedly connected with first driving gear 16 and driving gear 2 on the input shaft 1; Also be supported with intermediate propeller shaft 3 in the big casing 14, the driving gear 2 that is fixedly connected with second driving gear 4 on this intermediate propeller shaft 3 and is meshed with driving gear 2 on the input shaft 1, the driving gear 2 on the input shaft 1 is identical gear with driving gear 2 on the intermediate propeller shaft 3; Also be supported with ratio differential gear shaft 5 in the big casing 14, be fixedly connected with the ratio differential gear 6 that is meshed with second driving gear 4 on this ratio differential gear shaft 5; Also has the small box 15 that can be rotated to support on the bearing 12 in the big casing 14, one side of small box 15 is fixedly connected with the speed ratio fixed gear 7 with 16 engagements of first driving gear, and be supported with ratio differential gear shaft 5, opposite side is supported with output shaft 13, in small box 15, the axle head of ratio differential gear shaft 5 is fitted with ratio differential gear shaft gear 8, and the axle head of output shaft 13 is fitted with output gear 11; Also be supported with two or four differential gear axles 9 in the small box 15, all be fitted with a differential gear 10 on the every differential gear axle 9, differential gear 10 not only meshes with ratio differential gear shaft gear 8 but also meshes with output gear 11; Speed ratio fixed wheel 7 has Z1 tooth, and ratio differential gear 6 has Z2 tooth, and Z1 and Z2 differ 1 tooth or number tooth, and first driving gear 16 has Z3 tooth, and second driving gear 4 has Z4 tooth, and the ratio of Z3 and Z4 is 1: 2.

As shown in Figure 1, 2, the differential gear 10 in the small box 15 is four, and this is in order to increase the intensity of output shaft, also can for example, left and right two differential gears 10 among Fig. 2 be taken away only with two differential gears 10 certainly, but can reduce the intensity of output shaft like this.

Differential principle is described as follows: 1, revolve when going around when speed ratio fixed gear 7 drives small box 15, ratio differential gear 6 also revolves with same speed and direction goes around, then the differential gear in the small box 15 10 is not moving, just not work is goed around so output shaft also revolves with same speed and direction; 2, when driving small box 15, speed ratio fixed gear 7 revolves when going around, when if ratio differential gear 6 rotates with same direction speed fast again at one time, differential gear 10 is being ring Zhou Yundong around output gear 11, thereby output shaft 13 is motionless, and promptly rotating speed is zero; 3, utilize 2 principle, when the ratio of the tooth number Z 4 of the tooth number Z 3 of first driving gear 16 and the 2nd driving gear 4 is 1: 2, the rotating speed of ratio differential gear 6 is 2 times of speed ratio fixed gear 7, if at this moment the tooth number Z 2 of the tooth number Z 1 of speed ratio fixed gear 7 and ratio differential gear 6 differs a tooth, output shaft 13 can obtain the number of teeth/one's of speed ratio fixed gear 7 rotating speed, if the tooth number Z 2 of the tooth number Z 1 of speed ratio fixed gear 7 and ratio differential gear 6 differs the n tooth, output shaft 13 can obtain the rotating speed of n of the number of teeth branch of speed ratio fixed gear 7; When Z2＞Z1, for multiple tooth poor, output shaft 13 sense of rotation are identical with speed ratio fixed gear 7, for clockwise, when ratio differential gear 6 lacks tooth than speed ratio fixed gear 7, promptly during Z2＜Z1, poor for few tooth, at this moment output shaft 13 sense of rotation are opposite with speed ratio fixed gear 7, are counter-rotating.

Adopt the reduction speed ratio i formula of the present utility model of above-mentioned principle as follows:

i＝(Z1/Z3)·[Z1/(Z2-Z1)]

As work as Z3=15, and Z1=150, during Z2=151,

i＝(150/15)·[150/(151-150)]＝1500

The utility model job step is as follows: motor drives input shaft 1 rotates, and input shaft 1 drives the driving gear 2 and first driving gear 16 that are fixed on the input shaft 1 and rotates, and is divided into the two-way transmission then.First driving gear 16 drives speed ratio fixed gear 7 and rotates, and speed ratio fixed gear 7 drives the small box 15 of fixedlying connected with it again and rotates, and small box 15 drives differential gear 10 by differential gear axle 9 and makes ring Zhou Yundong around output gear 11.The second the tunnel is that the driving gear 2 that the driving gear 2 on the input shaft 1 drives on the intermediate propeller shaft 3 rotates, driving gear 2 drives intermediate propeller shaft 3 and rotates, and then drive second driving gear 4 again and rotate, second driving gear 4 drives ratio differential gear 6 and rotates, ratio differential gear 6 drives ratio differential gear shaft 5 and rotates, ratio differential gear shaft 5 drives the ratio differential gear shaft gear 8 that is fixed on the ratio differential gear shaft 5 and rotates, and ratio differential gear shaft gear 8 drives differential gear 10 and rotates.Last two-way transmission realizes differential drive, thereby makes output gear 11 and output shaft 13 obtain very little rotating speed and very big output torque.

Claims

1, a kind of differential gear speed reducer has big casing (14) and bearing (12), and is bearing in input shaft (1) and output shaft (13) on the big casing (14), it is characterized in that:

Be fixedly connected with first driving gear (16) and driving gear (2) on a, the input shaft (1);

Also be supported with intermediate propeller shaft (3) in b, the big casing (14), the driving gear (2) that is fixedly connected with second driving gear (4) on this intermediate propeller shaft (3) and is meshed with driving gear (2) on the input shaft (1);

Also be supported with ratio differential gear shaft (5) in c, the big casing (14), be fixedly connected with the ratio differential gear (6) that is meshed with second driving gear (4) on this ratio differential gear shaft (5);

Also has the small box (15) that can be rotated to support on the bearing (12) in d, the big casing (14), one side of small box (15) is fixedly connected with the speed ratio fixed gear (7) with first driving gear (16) engagement, and be supported with ratio differential gear shaft (5), opposite side is supported with output shaft (13), in small box (15), the axle head of ratio differential gear shaft (5) is fitted with ratio differential gear shaft gear (8), and the axle head of output shaft (13) is fitted with output gear (11);

Also be supported with two or four differential gear axles (9) in e, the small box (15), all be fitted with a differential gear (10) on the every differential gear axle (9), differential gear (10) both meshed with ratio differential gear shaft gear (8), meshed with output gear (11) again;

F, speed ratio fixed gear (7) have Z1 tooth, and ratio differential gear (6) has Z2 tooth, and Z1 and Z2 differ 1 tooth or number tooth, and first driving gear (16) has Z3 tooth, and second driving gear (4) has Z4 tooth, and the ratio of Z3 and Z4 is 1: 2.