Thrust brake on the outboard engine axle drive shaft
Technical field
The utility model relates to thrust brake on a kind of outboard engine axle drive shaft.
Background technology
Outboard engine is when work, and the power of driving engine output is by being delivered under the driving axial on the shifting gear that is installed in gear case, and shifting gear and prop shaft mesh, and prop shaft drives the screw propeller rotation, produces thrust.In this power transmittance process, can produce friction drag, influence power transfer efficiency, also can produce noise.
For the friction drag in the depowering transmittance process, improve power transfer efficiency, reduce noise, be furnished with several bearings under water in the device case and be used to reduce friction drag; Be furnished with two bearings in the prop shaft axial location, one of them bearing press mounting is under water on the device case, another is fitted on the underwater units case lid, and two shifting gears are installed in respectively on these two bearings, realizes reducing the purpose of shifting gear spin friction power; At the driving axis shaft position, tandem is arranged two bearings, realizes reducing the purpose of axle drive shaft spin friction power.In addition, axle drive shaft is that the driving gear by being installed in the axle drive shaft top is delivered to shifting gear with the power of driving engine, driving gear and shifting gear engagement, the driving gear flute profile is a screw bevel gear, friction drag during its work and noise are subjected to the influence of gear backlash.In the power transmittance process, when the hand of rotation of the helical angle of design-calculated driving gear (A to) and driving gear is opposite, shifting gear can produce an application force that pulls down to driving gear, this application force can have influence on the relative position of driving gear and shifting gear, thereby has influence on the size of gear backlash.
Summary of the invention
The utility model purpose is: thrust brake on a kind of outboard engine axle drive shaft is provided, this installs, and the bearing away from driving gear adopts thrust bearing in the bearing that performs of the drive axis position on the device case under water, by the size that thrust bearing cooperates shimming plate to come the pinion sideshake, realize reducing the purpose of friction drag.
The technical solution of the utility model is: thrust brake on a kind of outboard engine axle drive shaft, comprise by perform bearing and lower gear bearing and be vertically mounted on axle drive shaft in the underwater units housing, the lower end of axle drive shaft is equipped with driving gear, and the described bearing that performs adopts thrust bearing.
The further technical scheme of the utility model is: thrust brake on a kind of outboard engine axle drive shaft, comprise by perform bearing and lower gear bearing and be vertically mounted on axle drive shaft in the underwater units housing, the lower end of axle drive shaft is equipped with driving gear, and the described bearing that performs adopts thrust bearing; The underwater units housing of the described bearing below of performing is provided with step, step and perform and be provided with shimming plate between the bearing.
The utility model advantage is:
The utility model under water in the bearing of the drive axis position on the device case bearing that performs away from driving gear adopt thrust bearing, by the size that thrust bearing cooperates shimming plate to come the pinion sideshake, realize reducing the purpose of friction drag.
2. the utility model is simple in structure, and the reliability height can effectively improve power transfer efficiency, reduces noise.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is a structural representation of the present utility model.
Wherein: 1 bearing that performs; 2 lower gear bearings; 3 underwater units housings; 4 axle drive shafts; 5 driving gears; 6 steps; 7 shimming plates.
The specific embodiment
Embodiment: as shown in Figure 1, thrust brake on a kind of outboard engine axle drive shaft, comprise by perform bearing 1 and lower gear bearing 2 and be vertically mounted on axle drive shaft 4 in the underwater units housing 3, the lower end of axle drive shaft 4 is equipped with driving gear 5, the described bearing 1 that performs adopts thrust bearing, the underwater units housing 3 of bearing 1 below of performing is provided with step 6, step 6 and perform and be provided with shimming plate 7 between the bearing 1.
Axle drive shaft 4 is that the driving gear 5 by being installed in axle drive shaft 4 tops is delivered to shifting gear with the power of driving engine, driving gear 5 and shifting gear engagement, driving gear 5 flute profiles are screw bevel gear, and friction drag during its work and noise are subjected to the influence of gear backlash.In the power transmittance process, shifting gear can produce an application force that pulls down to driving gear 5, and this application force can have influence on the relative position of driving gear 5 and shifting gear, thereby has influence on the size of gear backlash.The bearing 1 that performs away from driving gear 5 adopts thrust bearing in the bearing of axle drive shaft 4 axial location on the underwater units housing 3 with being arranged in, and by the size that thrust bearing 1 cooperates shimming plate 7 to come the pinion sideshake, realizes reducing the purpose of friction drag.
The utility model is simple in structure, and the reliability height can effectively improve power transfer efficiency, reduces noise.