CN208169439U

CN208169439U - A kind of gear reduction unit

Info

Publication number: CN208169439U
Application number: CN201721923313.XU
Authority: CN
Inventors: 陈建林
Original assignee: Zhejiang Pearl Machinery Co Ltd
Current assignee: Zhejiang Pearl Machinery Co Ltd
Priority date: 2017-12-30
Filing date: 2017-12-30
Publication date: 2018-11-30
Anticipated expiration: 2027-12-30

Abstract

The utility model discloses a kind of gear reduction units, it is related to retarding device, for solving the problems, such as that existing reducer input shaft is be easy to cause transmission gear overload breakage by unilateral power, including cabinet, it is rotationally connected with the intracorporal input shaft of case, the double reduction wheel group of linkage is engaged with input shaft, the three-level ratio wheel group of linkage is engaged with double reduction wheel group, the output shaft of linkage is engaged with three-level ratio wheel group by output wheel group, it is fixed on the cabinet and is used for the case lid of closed box, the both ends of input shaft and output shaft are respectively positioned on outside cabinet, and keyway is offered on the side wall at input shaft and output shaft both ends；The utility model has the following advantages that and effect：This programme utilizes new mechanical structure, the output shaft that the input shaft and both ends that both ends input simultaneously export simultaneously, input shaft and the transmission gear at output shaft both ends can be made uniformly to share load during transmission, so that transmission gear is not easy the case where tooth root fracture occur because overloading fatigue during linkage.

Description

A kind of gear reduction unit

Technical field

The utility model relates to retarding device, in particular to a kind of gear reduction unit.

Background technique

Retarder is a kind of power transfer mechanism, mainly changes input mechanism and output mechanism using the transmission ratio of gear Between speed, and output torque is improved while reduction of speed, so that small machine can also drive big mechanical action, therefore wide It is general to be applied to the industries such as metallurgy, coal, building, ship, water conservancy.

Currently, Authorization Notice No. is CN204664306U, the Chinese utility model that authorized announcement date is 2015.09.23 is public A kind of vertical shaft type Two Grade Column Gear Reducer is opened, including cabinet, cabinet upper surface are equipped with case lid, are plugged with actively in cabinet Gear, reducer output shaft and intermediate gear shaft, driving gear shaft lower end is equipped with driving gear, on the reducer output shaft End is equipped with gear wheel, and intermediate gear shaft is equipped with intermediate gear and pinion gear, and intermediate gear engages with gear wheel, pinion gear and Driving gear engagement, the cabinet lower end surface are equipped with gland and oil tight skeleton for sealing cabinet lower end.

Cylinder gear speed reducer as described above, when use outside power mechanism driving driving gear shaft rotation, actively Gear shaft passes through driving gear in the course of rotation and the engagement of pinion gear drives intermediate gear shaft rotation, and intermediate gear shaft is again Reducer output shaft rotation is driven by the engagement of intermediate gear and gear wheel, so that executing agency is imparted power to, it is this Flat key slot is offered on one end that the driving gear shaft and reducer output shaft of cylinder gear speed reducer are located at outside cabinet, therefore It can be inferred that the driving gear shaft of retarder and reducer output shaft carried out by gear and power mechanism or executing agency Linkage, and driving gear shaft due to this retarder and reducer output shaft all only have one end to be located at outside cabinet, when holding When the load of row mechanism is larger, the load that the transmission gear on driving gear shaft and reducer output shaft is born is also larger, individually Stress makes transmission gear be very easy to overload fatigue occur, the case where tooth root fracture occurs so as to cause transmission gear.

Utility model content

The purpose of the utility model is to provide a kind of gear reduction unit, the structure with dual input and dual output can subtract Load on few single gear teeth of transmission gear reduces a possibility that transmission gear generates overload fatigue, to make transmission gear not The case where being easy to appear tooth root fracture.

The above-mentioned technical purpose of the utility model technical scheme is that：A kind of gear reduction unit, Subtract including cabinet, the double reduction wheel group for being rotationally connected with the intracorporal input shaft of the case, engaging linkage with input shaft, with second level The three-level ratio wheel group of fast wheel group engagement linkage, output shaft, the fixation for engaging linkage with three-level ratio wheel group by output wheel group In the case lid on the cabinet and for closed box, the both ends of the input shaft and output shaft are respectively positioned on outside cabinet, and in institute It states and offers keyway on input shaft and the side wall at output shaft both ends.

By using above scheme, this retarder can pacify simultaneously on the both ends of input shaft and output shaft when in use Transmission gear is loaded onto, then connecting key is packed into the keyway on input shaft and output shaft, transmission gear is made to be not easy and input Axis or output shaft produce relative rotation, then allow transmission gear on input shaft and output shaft respectively with power mechanism and execution machine Structure links, during power mechanism imparts power to input shaft, since there are two transmission gears to share engine Structure conveys the torque to come, so that the load that single transmission gear is born reduces half, therefore transmission gear is not easy to produce Raw overload fatigue, so that transmission gear be made to be not easy the case where tooth root fracture occur；And due to the two of input shaft and output shaft It holds while bearing load, so that input shaft and output shaft are not susceptible to the effect of unidirectional force in the course of rotation and generate rolling It is dynamic, so that the transmission of retarder is more steady.

The utility model is further arranged to：Escapement is provided on the input shaft and output shaft, it is described anti- Release mechanism include be opened on the input shaft and output shaft and be located at keyway in mounting groove, be articulated with the input shaft or defeated On shaft and be located in mounting groove mousing-hook, be set on the input shaft or output shaft and for driving the latch hook of mousing-hook The driving assembly that portion is moved towards abjection mounting groove side, the mousing-hook are provided with the one end in latch hook portion towards the opening of keyway Side.

By using above scheme, retarder needs during transmission gear is installed on input shaft and output shaft Connecting key is installed in keyway, makes to be not easy to synchronize between transmission gear and input shaft or output shaft, the present embodiment In keyway when opening up in view of fast installing the needs of connecting key, set keyway to the form of through slot, this keyway exists When transmission gear has the trend for generating offset along the length direction of input shaft or output shaft, it is easy to deviate from out of keyway, and After escapement is set, when installing connecting key, mousing-hook is pressed in mounting groove first, connecting key is then packed into keyway It is interior, mousing-hook is then decontroled, latch hook portion one end of mousing-hook is stretched out out of mounting groove under the driving of driving assembly, overlap joint connection Key is on the side wall of keyway opening side, so that connecting key is not easy to deviate from out of keyway, to make transmission gear and input Do not allow to be also easy to produce skidding between axis, output shaft.

The utility model is further arranged to：The driving component include be opened on the input shaft or output shaft and Fitting groove in mounting groove, the elastic component being embedded in the fitting groove, the fitting groove are located at input shaft or output shaft The upper latch hook portion side close to mousing-hook, one end of the elastic component are pushed against on input shaft or output shaft, and the other end pushes against In mousing-hook.

By using above scheme, since elastic component is in compressive state, drive of the elastic component in natural resiliency potential energy Reset can be generated under dynamic, one end that mousing-hook can be driven to be provided with latch hook portion during elastic component resets is installed towards abjection The side of slot moves, so that mousing-hook be enable to catch on connecting key.

The utility model is further arranged to：The escapement further includes integrated setting in the input shaft or defeated Block on shaft and in mounting groove, the block and elastic component are located at the two sides of mousing-hook.

By using above scheme, block can block mousing-hook, be packed into mousing-hook in keyway in no connecting key Situation is not easy to turn over too big angle, so that elastic component is not easy to drop out out of fitting groove, to make elastic component in transport It is not easy to lose in the process.

The utility model is further arranged to：In the latch hook portion of the mousing-hook and back to the center of rotation of mousing-hook one Inclined surface is also provided on the side wall of side.

By using above scheme, the inclined surface in latch hook portion can work as connection during connecting key is packed into keyway When key contacts with the inclined surface generation in latch hook portion and does the movement goed deep into keyway, connecting key can be incited somebody to action along this inclined surface The latch hook portion of mousing-hook is pushed towards the side in insertion mounting groove, and connecting key is enable smoothly to be packed into keyway, and even It connects after key is completely embedded into keyway, mousing-hook can be stretched out out of mounting groove under the driving of elastic component again, and latch hook portion is made to be overlapped on company It connects on key, to achieve the purpose that limit connecting key deviates from out of keyway.

The utility model is further arranged to：The double reduction wheel group includes that integrated setting in input shaft is located at case The input gear teeth on the side wall of internal one end are rotationally connected with the intracorporal secondary drive shaft of the case, are fixed on the second level and pass The number of teeth of double-reduction gear on moving axis and with input gear teeth meshing, the input gear teeth is less than the tooth of double-reduction gear Number.

By using above scheme, the number of teeth for inputting the gear teeth is less than the number of teeth of double-reduction gear, so that input shaft and two Transmission ratio between grade transmission shaft is greater than 1, according to transmission ratio formula i=n1/n2=z2/z1, it is known that the revolving speed of input shaft is greater than The revolving speed of secondary drive shaft, the transmission inputted between the gear teeth and double-reduction gear at this time is deceleration regime, and will input tooth Direct integrated setting is taken turns on input shaft, volume between transmission can be reduced, to reach the mesh for reducing retarder volume 's.

The utility model is further arranged to：The input shaft is located at the underface of the secondary drive shaft.

By using above scheme, larger gap is had between the inner wall of reduction case gears at different levels, by input shaft After being set to immediately below earphone rotation axis, it can be improved the utilization rate of housing interior volume, further decrease deceleration to reach The purpose of body product.

The utility model is further arranged to：The three-level ratio wheel group includes integrated setting in secondary drive shaft side Three-level driving wheel tooth on wall is rotationally connected with the intracorporal three-level transmission shaft of case, is fixed on the three-level transmission shaft and with three The three-level reduction gearing of grade driving wheel tooth engagement, the number of teeth of the three-level driving wheel tooth are less than the number of teeth of three-level reduction gearing.

Similar with the principle of double-reduction gear group by using above scheme, the number of teeth of three-level driving wheel tooth is less than three The number of teeth of grade reduction gearing so that transmission ratio between secondary drive shaft and three-level transmission shaft is greater than 1, at this time secondary drive shaft and Transmission between three-level transmission shaft is deceleration regime, and by the direct integrated setting of three-level driving wheel tooth on input shaft, energy Enough reduce the distance between secondary drive shaft and three-level transmission shaft, therefore double reduction wheel group and three-level reduction gearing can be reduced The volume of group, to achieve the purpose that further to reduce retarder volume.

The utility model is further arranged to：The output wheel group includes integrated setting on three-level transmission shaft side wall The output gear teeth, be fixed on the output shaft and with output gear teeth meshing output gear, it is described output the gear teeth the number of teeth it is small In the number of teeth of output gear.

By using above scheme, the number of teeth for exporting the gear teeth is less than the number of teeth of output gear, so that three-level transmission shaft and defeated Transmission ratio between shaft is greater than 1, is similarly deceleration regime between three-level transmission shaft and output shaft at this time, at this time entire retarder Inside forms level Four reducing transmission structure, therefore can substantially reduce power mechanism and be driven the revolving speed to come, and revolving speed is lower, turns round Square is bigger, so that this retarder be made to be able to bear bigger load.

In conclusion the utility model has the advantages that：

1. the output shaft that input shaft and both ends that both ends input simultaneously export simultaneously, can make to input during transmission Axis and the transmission gear at output shaft both ends uniformly share load, so that transmission gear is not easy because overload is tired during linkage Labor and there is the case where tooth root fracture；

2. the mousing-hook on input shaft and output shaft limitation connecting key can take off after connecting key is packed into keyway out of keyway Out, so that not allowing to be also easy to produce skidding between transmission gear and input shaft, output shaft, to enable retarder by power mechanism Power transmission is to executing agency；

3. the inclined surface in mousing-hook can be during connecting key be packed into keyway in retraction mounting groove, and is being connected It connects after key is entirely enclosed in keyway and is resetted under the driving of elastic component, to achieve the purpose that facilitate installation connecting key.

Detailed description of the invention

Fig. 1 is the main view of the present embodiment；

Fig. 2 is the left view of the present embodiment；

Fig. 3 is the top view of the present embodiment；

Fig. 4 is the structural schematic diagram of the present embodiment cabinet and case lid；

Fig. 5 is the cross section view of the present embodiment；

Fig. 6 is the structural schematic diagram of the present embodiment input shaft；

Fig. 7 is the partial enlarged view being located at A in Fig. 6.

In figure：1, cabinet；11, axis hole is filled；12, lower dress axial trough；2, input shaft；3, double reduction wheel group；31, wheel for inputting Tooth；32, secondary drive shaft；33, double-reduction gear；4, three-level ratio wheel group；41, three-level driving wheel tooth；42, three-level is driven Axis；43, three-level reduction gearing；5, output shaft；6, bearing；7, first bearing end cap；8, escapement；81, mounting groove；82, prevent It breaks off relations；821, interconnecting piece；822, latch hook portion；8221, inclined surface；83, driving assembly；831, fitting groove；832, elastic component；833, Block；9, second bearing end cap；10,3rd bearing end cap；20, output wheel group；201, the gear teeth are exported；202, output gear； 30, keyway；40, fourth bearing end cap；50, case lid；501, upper dress axial trough.

Specific embodiment

The utility model is described in further detail below in conjunction with attached drawing.

As shown in Figure 4 and Figure 5, a kind of gear reduction unit, including cabinet 1, input shaft 2, double reduction wheel group 3, three-level subtract Fast wheel group 4, output shaft 5, case lid 50 offer the dress axis hole 11 of perforation on the side wall of cabinet 1, are used for and case lid in cabinet 1 The lower dress axial trough 12 being parallel to each other there are three central axis is opened up on the end face of 50 inconsistent sides, fills axial trough 12 under three Diameter from a side to the other side extend during be sequentially increased, dress axis hole 11 be located at diameter it is the smallest it is lower fill axial trough 12 just under Side；The upper dress for being cooperated with lower dress axial trough 12 is offered on the end face with the inconsistent side of cabinet 1 in case lid 50 Axial trough 501, after cabinet 1 and the lid of case lid 50 close, upper dress axial trough 501 and lower dress axial trough 12 close up the rounded circle of rear Formation cross-section Hole.

As shown in Fig. 2, Fig. 3 and Fig. 5, input shaft 2 is rotatablely installed in the dress axis hole 11 on cabinet 1, at this time by bearing 6 The both ends of input shaft 2 are respectively positioned on outside cabinet 1, and after input shaft 2 is packed into dress axis hole 11, then at the both ends of input shaft 2 It is arranged first bearing end cap 7, first bearing end cap 7 is fixed on cabinet 1 with bolt after installing first bearing end cap 7, thus The bearing 6 on input shaft 2 is set to be not easy to drop out out of cabinet 1；It is opened up on the side wall that input shaft 2 is located at the outer both ends of cabinet 1 There is length direction to be parallel to the keyway 30 of 2 length direction of input shaft, keyway 30 is connected with the end face of input shaft 2, and two keys Slot 30 opening towards mutually back to side.

As shown in Figure 6 and Figure 7, it is located at the position in keyway 30 in input shaft 2 and is provided with escapement 8, escapement 8 Including mounting groove 81, mousing-hook 82, driving assembly 83, mounting groove 81 is opened on input shaft 2 and is located in keyway 30, and installs One end of slot 81 is connected with the end face of input shaft 2；Mousing-hook 82 includes that interconnecting piece 821 and integrated solid schedule interconnecting piece 821 On latch hook portion 822, interconnecting piece 821 and latch hook portion 822 make mousing-hook 82 in hook, interconnecting piece 821 far from latch hook portion 822 one End be articulated in mounting groove 81, and far from mounting groove 81 be open one end, and at this time latch hook portion 822 far from interconnecting piece 821 One end is located in keyway 30, is provided with inclined surface on side wall of the latch hook portion 822 back to 821 center of rotation side of interconnecting piece 8221, inclined surface 8221 keeps the section in latch hook portion 822 triangular in shape；Driving assembly 83 includes fitting groove 831,832 and of elastic component Block 833, fitting groove 831 are opened in the position being located in mounting groove 81 on input shaft 2, and one to be open close to mounting groove 81 End；Elastic component 832 is spring, and elastic component 832 is embedded in fitting groove 831, and one end of elastic component 832 is pushed against fitting groove at this time 831 bottom, the other end are pushed against interconnecting piece 821 back on the side wall of 822 side of latch hook portion；833 integrated solid of block schedules On input shaft 2 and it is located in mounting groove 81, block 833 and elastic component 832 are located at the two sides of interconnecting piece 821 at this time, and keep off Block 833 is between latch hook portion 822 and the center of rotation of interconnecting piece 821, and block 833 is back to the end of 821 side of interconnecting piece The bottom flush in face and keyway 30.

As shown in Figure 5 and Figure 6, double reduction wheel group 3 includes the input gear teeth 31, secondary drive shaft 32, double-reduction gear 33, input 31 integration of the gear teeth is opened on the side wall of input shaft 2, and is located in cabinet 1；Secondary drive shaft 32 passes through bearing 6 It is rotatablely connected in the lower dress axial trough 12 being located at right above dress axis hole 11 on cabinet 1, and is installed in secondary drive shaft 32 in bearing 6 Afterwards, second bearing end cap 9 (see Fig. 1 main view) is installed on cabinet 1, and with bolt by second bearing end cap 9 and cabinet 1 into Row is fixed, so that the bearing 6 in secondary drive shaft 32 is not easy to drop out out of cabinet 1；Double-reduction gear 33 is fixed on second level On transmission shaft 32, double-reduction gear 33 is meshed with the input gear teeth 31, and the diameter of double-reduction gear 33 and the number of teeth are big In the diameter and the number of teeth of the input gear teeth 31, it is greater than according to the revolving speed that transmission ratio formula i=n1/n2=z2/z1 can obtain input shaft 2 The revolving speed of secondary drive shaft 32, thus rotation pass in secondary drive shaft 32 after have passed through deceleration.

Three-level ratio wheel group 4 includes three-level driving wheel tooth 41, three-level transmission shaft 42, three-level reduction gearing 43, three-level transmission The gear teeth 41 are opened on the side wall of secondary drive shaft 32；Three-level transmission shaft 42 is rotationally connected on cabinet 1 and second level by bearing 6 In the adjacent lower dress axial trough 12 of transmission shaft 32,3rd bearing end cap 10 is installed after three-level transmission shaft 42 installs on cabinet 1 (see Fig. 1 main view), and 3rd bearing end cap 10 and cabinet 1 are fixed with bolt, so that the axis on three-level transmission shaft 42 6 are held to be not easy to drop out out of cabinet 1；Three-level reduction gearing 43 is fixed on three-level transmission shaft 42, three-level reduction gearing 43 and three Grade driving wheel tooth 41 is meshed, and the diameter of three-level reduction gearing 43 and the number of teeth are all larger than the diameter and tooth of three-level driving wheel tooth 41 Number.

Output shaft 5 is rotationally connected in lower dress axial trough 12 adjacent with three-level transmission shaft 42 on cabinet 1 by bearing 6, and The both ends of output shaft 5 also are located at outside cabinet 1；Upper fourth bearing end cap 40 (see Fig. 1 main view) is covered at the both ends of output shaft 5, and Equally fourth bearing end cap 40 is fixed on cabinet 1 with bolt, so that the bearing 6 on output shaft 5 is less likely to occur to fall off.

It is linked between output shaft 5 and third transmission shaft by output wheel group 20, output wheel group 20 includes the output gear teeth 201, output gear 202, the output gear teeth 201 are opened on the side wall of third transmission shaft；Output gear 202 is fixed on output shaft 5 On, it is intermeshed between output gear 202 and the output gear teeth 201, the diameter and the number of teeth of output gear 202 are all larger than output wheel The diameter and the number of teeth of tooth 201, and the diameter of output gear 202, three-level reduction gearing 43, double-reduction gear 33 successively subtracts It is small；Keyway 30 is also offered on the side wall that output shaft 5 is located at the outer both ends of cabinet 1, the keyway 30 on output shaft 5 and output shaft 5 End face be connected, and two on output shaft 5 keyway 30 opening towards mutually back to side；On output shaft 5 and position It is again provided with escapement 8 in the position in keyway 30, and the structure of escapement 8 and anticreep on input shaft 2 on output shaft 5 The structure of mechanism 8 is identical.

As shown in Figure 1 and Figure 4, after the above drive mechanisms at different levels are all installed on cabinet 1, case lid 50 is installed to cabinet On 1, and it is combined with each other the upper dress axial trough 501 on case lid 50 and the lower dress axial trough 12 on cabinet 1, first uses spiral shell after installing case lid 50 Case lid 50 and cabinet 1 are fixed together by bolt, then again with bolt respectively by second bearing end cap 9,10 and of 3rd bearing end cap Fourth bearing end cap 40 is fixed together with case lid 50, to complete the installation of entire retarder.

Specific implementation process：Driving cog is loaded onto simultaneously firstly the need of at the both ends of input shaft 2 and output shaft 5 when in use Wheel, and the transmission gear on input shaft 2 and output shaft 5 is made to be meshed respectively with power mechanism and executing agency, transmission gear exists After on input shaft 2 or output shaft 5, needs to be limited to generate between transmission gear and input shaft 2 or output shaft 5 with connecting key and beat Sliding, connecting key is during being packed into keyway 30, the meeting after inclined surface 8221 on connecting key and latch hook portion 822 generates contact It pushes in 822 retraction mounting groove 81 of latch hook portion, when connecting key is completely embedded into keyway 30 and is deep into latch hook portion 822 and keyway 30 Far from latch hook portion 822 inner wall between position when, interconnecting piece 821 can under the driving of elastic component 832 band moveable lock hook portion 822 It is stretched out out of mounting groove 81, enables latch hook portion 822 that connecting key is stopped to be deviate from out of keyway 30；Subsequent power mechanism is by torque It is driven to the transmission gear on input shaft 2, drive gears driven input shaft 2 rotates, and input shaft 2 drives 32 turns of secondary drive shaft Dynamic, secondary drive shaft 32 drives three-level transmission shaft 42 to rotate, and three-level transmission shaft 42 drives output shaft 5 to rotate again, and due to defeated Enter the biography between axis 2 and secondary drive shaft 32, secondary drive shaft 32 and three-level transmission shaft 42, three-level transmission shaft 42 and output shaft 5 It is dynamic than being all larger than 1, therefore during rotating and passing to output shaft 5 from input shaft 2, revolving speed constantly reduces, and torque constantly increases, and makes It obtains the revolving speed that retarder exports power mechanism to slow down, and since there are two driving cogs on input shaft 2 and output shaft 5 Wheel shares power mechanism and is transmitted through the torque come so that the load that single transmission gear is born reduces half, therefore be not easy because Overload is tired and the case where tooth root fracture occurs, and due to the both ends of input shaft 2 and output shaft 5 while stress, so that input Axis 2 and output shaft 5 are not allowed to generate shaking in the course of rotation, to keep the transmission of retarder more steady.

This specific embodiment is only the explanation to the utility model, is not limitations of the present invention, ability Field technique personnel can according to need the modification that not creative contribution is made to the present embodiment after reading this specification, but As long as all by the protection of Patent Law in the scope of the claims of the utility model.

Claims

1. a kind of gear reduction unit, including cabinet (1), the input shaft (2) and input shaft that are rotationally connected in the cabinet (1) (2) the double reduction wheel group (3) of linkage is engaged, the three-level ratio wheel group (4) to link is engaged with double reduction wheel group (3), is passed through Output wheel group (20) engages the output shaft (5) of linkage with three-level ratio wheel group (4), is fixed on the cabinet (1) and for sealing The case lid (50) of closed box body (1), it is characterised in that：The both ends of the input shaft (2) and output shaft (5) are respectively positioned on cabinet (1) outside, And keyway (30) are offered on the side wall at the input shaft (2) and output shaft (5) both ends.

2. a kind of gear reduction unit according to claim 1, it is characterised in that：On the input shaft (2) and output shaft (5) It is provided with escapement (8), the escapement (8) includes being opened on the input shaft (2) and output shaft (5) and being located at Mounting groove (81) in keyway (30) is articulated on the input shaft (2) or output shaft (5) and is located at anti-in mounting groove (81) Break off relations (82), be set on the input shaft (2) or output shaft (5) and be used to drive latch hook portion (822) court of mousing-hook (82) The driving assembly (83) moved to abjection mounting groove (81) side, the mousing-hook (82) are provided with one end of latch hook portion (822) Towards the opening side of keyway (30).

3. a kind of gear reduction unit according to claim 2, it is characterised in that：The driving component (83) includes being opened in On the input shaft (2) or output shaft (5) and be located at mounting groove (81) in fitting groove (831), be embedded at the fitting groove (831) elastic component (832) in, the fitting groove (831) are located on input shaft (2) or output shaft (5) close to mousing-hook (82) Latch hook portion (822) side, one end of the elastic component (832) is pushed against on input shaft (2) or output shaft (5), and the other end It is pushed against on mousing-hook (82).

4. a kind of gear reduction unit according to claim 3, it is characterised in that：The escapement (8) further includes one Change the block (833) for being set on the input shaft (2) or output shaft (5) and being located in mounting groove (81), the block (833) The two sides of mousing-hook (82) are located at elastic component (832).

5. a kind of gear reduction unit according to claim 2, it is characterised in that：The latch hook portion of the mousing-hook (82) (822) on and back to being also provided with inclined surface (8221) on the side wall of the center of rotation side of mousing-hook (82).

6. a kind of gear reduction unit according to claim 1, it is characterised in that：The double reduction wheel group (3) includes one Body is set to the input gear teeth (31) that input shaft (2) is located on the side wall of cabinet (1) interior one end, is rotationally connected with the cabinet (1) secondary drive shaft (32) in is fixed on the secondary drive shaft (32) and the second level engaged with the input gear teeth (31) subtracts The number of teeth of fast gear (33), the input gear teeth (31) is less than the number of teeth of double-reduction gear (33).

7. a kind of gear reduction unit according to claim 6, it is characterised in that：The input shaft (2) is located at the second level The underface of transmission shaft (32).

8. a kind of gear reduction unit according to claim 1, it is characterised in that：The three-level ratio wheel group (4) includes one Three-level driving wheel tooth (41) that body is set on secondary drive shaft (32) side wall, the three-level being rotationally connected in cabinet (1) pass Moving axis (42) is fixed on the three-level reduction gearing engaged on the three-level transmission shaft (42) and with three-level driving wheel tooth (41) (43), the number of teeth of the three-level driving wheel tooth (41) is less than the number of teeth of three-level reduction gearing (43).

9. a kind of gear reduction unit according to claim 1, it is characterised in that：The output wheel group (20) includes integration The output gear teeth (201) that are set on three-level transmission shaft (42) side wall, be fixed on the output shaft (5) and with the output gear teeth (201) number of teeth of the output gear (202) engaged, the output gear teeth (201) is less than the number of teeth of output gear (202).