CN2415967Y

CN2415967Y - Two-gear automatic varing speed mechanism

Info

Publication number: CN2415967Y
Application number: CN 00234086
Authority: CN
Inventors: 陈立宇
Original assignee: Industrial Technology Research Institute ITRI
Current assignee: Industrial Technology Research Institute ITRI
Priority date: 2000-05-09
Filing date: 2000-05-09
Publication date: 2001-01-24
Anticipated expiration: 2010-05-09

Abstract

The utility model relates to a two-gear automatic speed-change mechanism, which comprises two constant meshed gear sets which are arranged on the same set of parallel shafts. The utility model is characterized in that a one-way bearing is arranged between one gear of low gears and a centre shaft thereof; a rolling bearing is arranged between one gear of high gears at the other shaft and a centre shaft thereof; the rest of the two gear sets move together with the shafts; when the one-way shaft is arranged at a low gear, the power can be transmitted to an output shaft form an input shaft via a low speed gear set; except the shaft at which the one-way shaft is arranged, the other shaft is provided with a set of centrifugal clutch unit between two gears; therefore, an automatic speed-change mechanism with high efficiency is assembled.

Description

Two-shift automatic variable speed mechanism

The utility model relates to a kind of two-shift automatic variable speed mechanism, refers to a kind of high efficiency automatic transmission that has especially.

The change-speed box that mini locomotive is used, adopt stepless speed changing mechanism traditionally, or planetary two-stage speed-changing mechanism, the process of its low gear and gear shift all has serious loss in efficiency problem, the change-speed box of this type is configured on composite power or the electric locomotive, tends to cause shortcomings such as endurance shortening, accelerating ability deficiency, for the special quality locomotive, can not satisfy requirements such as environmental protection and energy savings, be still a big defective.

Use the transmission gearbox on electric locomotive at present, continue to use the toric transmission or the planetary wheel two-speed transmission of two stroke locomotives more, its general city driving to be used at low gear, driving efficiency is less than 0.5 often, for emphasizing to be useful in the locomotive in city district, driving efficiency is less than 0.5 often, and for emphasizing to be useful in the locomotive in city district, the waste of the energy that causes is considerable.

As from the foregoing, above-mentioned known speed-changing mechanism on reality is used, obviously has inconvenience and exists with shortcoming, remains to be improved.

Main purpose of the present utility model, be to provide a kind of two-shift automatic variable speed mechanism, it still needs speed change at mini locomotive, to adjust primary mover (engine or motor) to high-revolving efficiency operation district, the transmission loss that reduction causes because of gearshift, and have high efficiency as the hand row change-speed box.

In order to achieve the above object, the utility model provides a kind of two-shift automatic variable speed mechanism, include two groups of gears in mesh groups often, be configured on the same group of parallel shafts, between a gear of low gear and its center shaft, dispose unilateral bearing, dispose antifriction-bearing box between another high speed gear and its center shaft, it is moving together with axle that remaining two gear is fixed in axle, it is that power can reach output shaft through the low speed gear group by input shaft that unilateral bearing is configured in low gear, disposing one group of centrifugal clutch unit between two gears on another axle except the unilateral bearing configuration axle, to form a two-shift automatic variable speed mechanism.

Describing preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing, so that further understand the feature and the technology contents of the utility model, yet is not to be used for the utility model is limited.Wherein:

Fig. 1 is the plan sketch (power-transfer clutch in the configuration of input shaft) of the utility model when high speed gear;

Fig. 2 is the plan sketch (power-transfer clutch in the configuration of input shaft) of the utility model when low gear;

Fig. 3 is the plan sketch of the utility model centrifugal clutch;

Fig. 4 is the plan sketch of the utility model platen;

Fig. 5 is the plan sketch (power-transfer clutch in the configuration of output shaft) of the utility model when high speed gear;

Fig. 6 is the plan sketch of the utility model configuration free-wheel clutch;

The plan sketch of Fig. 7 conventional belt for the utility model uses.

As shown in Figures 1 and 2, the utility model provides a kind of two-shift automatic variable speed mechanism, the utility model includes two groups and is configured on parallel input shaft 1 and the output shaft 2 gears in mesh group 3 often respectively, 4, wherein low speed gear group 3 includes one first gear 31 and one second gear 32 that is meshed, first gear 31 and second gear 32 are arranged at respectively on input shaft 1 and the output shaft 2, with input shaft 1 and output shaft 2 is center shaft, high speed gear group 4 includes one the 3rd gear 41 and one the 4th gear 42 that is meshed, the 3rd gear 41 and the 4th gear 42 are arranged at respectively on input shaft 1 and the output shaft 2, with input shaft 1 and output shaft 2 is center shaft, configuration one unilateral bearing 33 between second gear 32 and its center shaft (output shaft 2), configuration one antifriction-bearing box 43 between the high speed gear 41 of another (input shaft 1) and its center shaft (input shaft 1), remaining two gear (first gear 31 and the 4th gear 42) are fixed in axle 1, on 2, can be with

axle

1,2 rotate synchronously.Power can reach output shaft 2 through low speed gear group 3 by input shaft 1 when unilateral bearing 33 was configured in low gear, disposing one group of centrifugal clutch unit between two gears (first gear 31 and the 3rd gear 41) on another axle 1 except the unilateral bearing 33 configuration axles, it is made up of a centrifugal clutch 5 and a clutch control unit 6.

Centrifugal clutch 5 is formed (please consulting Fig. 3 simultaneously) by a clutch drum 51 and a centrifugal slipper 52, clutch drum 51 devices are at in-

line gears

31,41 first gear, 31 sides, centrifugal slipper 52 devices are at in-

line gears

31,41 first gear, 41 sides in addition, when rotating speed surpasses certain speed limit, centrifugal slipper 52 can contact and drive clutch drum 51, coaxial 1 two

gears

31,41 rotating speeds are consistent with axle 1, power can reach output shaft 2 through high speed gear group 4 by input shaft 1, the unilateral bearing 33 of former low speed gear group 3 by counter with and formative gear 32 and 2 idle running of axle.Dispose the taper hole 3 at little oblique angle on the centrifugal slipper 52, withstand slipper 52 whereby, in order to the opportunity of control clutch start in order to clutch control unit 6.

Clutch control unit 6 is in order to the opportunity of control gear shift, its device is on the gear 41 of centrifugal slipper 52 homonymies, it is by plunger 61, spring 62, platen 63 (please consulting Fig. 4 simultaneously) and one group of roller 64 are formed, plunger 61 has the awl post 66 and platen 63 interlocks adaptive with the taper hole 53 of slipper 52, can on slide rail 65, move by the influence of roller 64 centrifugal effect component and the pre-power of spring 62 compressions, try hard to recommend moving plunger 61 in advance by spring 62 compressions during low the commentaries on classics and withstand centrifugal slipper 52, make the power-transfer clutch can't start and remain on low gear, roller 64 centrifugal action component were after overcoming the pre-power of spring 62 compressions when rotating speed raise, drive platen 63 and the plunger 61 centrifugal slipper 52 that gets loose, when reaching gear shifting rotational speed, centrifugal slipper 52 and clutch drum 51 be instantaneous to contact start, the power of input shaft 1 can be passed to output shaft 2 via high speed gear group 4, and reaches the function that upgrades automatically.

When rotating speed continued to raise, roller 64 was restricted in position radially, can't continue compression spring 62, to guarantee the compression stroke of spring 62.When rotating speed reduces near gear shift, when platen 63 is subjected to the pulling force of spring plunger 61 compression reactions to surpass roller 64 centrifugal action component, plunger 61 moves to centrifugal slipper 52 approaching, the awl post 66 of plunger 61 adopts minimum oblique angle, can easily clutch drum 51 be left on centrifugal slipper 52 tops, the kinetic current of high speed gear group 4 is to interruption, power is returned to the situation of low speed gear group 3, when rotating speed is extremely low, be restricted in because of block 67 makes the position of plunger 61, make plunger 61 awl post 66 can't with taper hole 53 driving fits of centrifugal slipper 52 to avoid self-locking (as Fig. 2).

Gearshift of the present utility model is owing to there is clutch control unit 6 to control, and can set during speedup from bigger friction torque to begin braking, can reduce unnecessary cliding friction loss, guarantees acceleration capability.During deceleration when the moment of torsion of centrifugal clutch 5 during less than the car load torque, slipper 52 begins to skid, input shaft 1 rotating speed rises and to be transformed into the low gear state rapidly, and the K value that the length of the time of skidding can piston spring 62 is adjusted, and looks the performance curve of primary mover and selects.

The utility model still needs speed change at mini locomotive, to adjust primary mover (engine or motor) to high-revolving efficiency operation district, reduces the transmission loss that causes because of gearshift, and described two-shift automatic variable speed mechanism, and has the high efficiency as the hand row speed change.

In addition, as shown in Figure 5, the utility model clutch unit is also configurable on output shaft 2.As shown in Figure 6, the utility model unilateral bearing can be used free-wheel clutch 7 instead, is configured in coaxial 1 two

gears

31 and 41, and the transmission of gear 31 power changes by one-way clutch 7 and gear 41 and comes shaft coupling.As shown in Figure 7, the gear cluster of the utility model also can utilize conventional belt pulley set (or chain wheel set) 8,9 replace, it includes two groups of conventional belt pulley set (or chain wheel set) 8 that often link, 9, be configured in same group of parallel shafts 1, on 2, a conventional belt pulley (or sprocket wheel) 82 and 2 configurations of its center shaft unilateral bearing 33 at low gear, conventional belt pulley (or the sprocket wheel) 91 of another high speed gear and 1 configuration of its center shaft antifriction-bearing box 43, remaining two conventional belt pulley (or sprocket wheel) 81,92 with

axle

1,2 with moving, power can reach output shaft 2, two conventional belt pulleys (or sprocket wheel) 81 on another axle except the unilateral bearing 33 configuration axles through the conventional belt pulley set of low speed (or chain wheel set) 8 by input shaft 1 when unilateral bearing 33 was configured in low gear, one group of centrifugal clutch unit of forming by a centrifugal clutch 5 and a clutch control unit 6 of 91 configurations.

In sum, the utility model is a rare novel practical novel product in fact, has novelty, creativeness and practicality.

The above only is the preferable possible embodiments of the utility model, is not so inflexible limit claim of the present utility model, so the equivalent structure that all utilization the utility model specification sheetss and accompanying drawing content are done changes, all should belong in the protection domain of the utility model.

Claims

1, a kind of two-shift automatic variable speed mechanism is characterized in that, comprising:

One input shaft;

One output shaft:

Two groups of gears in mesh groups often are configured in this input shaft and output shaft;

One unilateral bearing is configured between a gear and its center shaft of low gear, and it is that power can reach output shaft through the low speed gear group by input shaft that described unilateral bearing is configured in low gear;

One bearing is configured between another high speed gear and its center shaft, and it is moving together with axle that remaining two gear of two gear clusters are fixed in axle;

One group of centrifugal clutch unit, it is configured in and unilateral bearing disposes between last two gears of corresponding another axle of axle.

2, two-shift automatic variable speed as claimed in claim 1 mechanism is characterized in that the centrifugal clutch unit is made up of centrifugal clutch and clutch control unit.

3, two-shift automatic variable speed as claimed in claim 2 mechanism, it is characterized in that, described centrifugal clutch is made up of a clutch drum and a centrifugal slipper, the clutch drum device is in a gear side of in-line gears, centrifugal slipper device is in another gear side of in-line gears, and when rotating speed surpasses certain speed limit, centrifugal slipper can contact and drive clutch drum, be that coaxial two gear rotational speeds are consistent with axle, dispose the taper hole at little oblique angle on the centrifugal slipper.

4, two-shift automatic variable speed as claimed in claim 2 mechanism, it is characterized in that, described clutch control unit is made up of plunger, spring, platen and one group of roller, plunger is adaptive awl post and the platen interlock of taper hole that has with the slipper of centrifugal clutch, can move by the influence of roller centrifugal effect component and the pre-power of length of spring compressed.

5, two-shift automatic variable speed as claimed in claim 1 mechanism is characterized in that clutch unit is configurable on input shaft or output shaft.

6, two-shift automatic variable speed as claimed in claim 1 mechanism is characterized in that unilateral bearing can be a free-wheel clutch.

7, two-shift automatic variable speed as claimed in claim 1 mechanism is characterized in that,

Described two groups often the gears in mesh group can be two groups of conventional belt pulley set of bonded assembly often.

8, two-shift automatic variable speed as claimed in claim 1 mechanism is characterized in that, described two groups often the gears in mesh group can be two groups of bonded assembly chain wheel set often.