CN2477895Y

CN2477895Y - Rack driving gear

Info

Publication number: CN2477895Y
Application number: CN 00241796
Authority: CN
Inventors: 吴秦业
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-18
Filing date: 2000-07-18
Publication date: 2002-02-20
Anticipated expiration: 2010-07-18

Abstract

A rack drive mechanism, which applies flexible rack to replace the rigid rack as conventionally used for rack drive so that the flexible rack can be engaged around the gear. The mechanism also contains a support frame, and the arc-like pressure plate on the support frame is positioned on the outer flank of the engaging part between the flexible rack and the gear, and the clearance between the car-like pressure plate and the back side of the flexible rack is small enough to ensure firm engagement between the flexible rack and the gear; therefore the utility model can realize rotations that cannot be realized by rigid rack drive.

Description

A kind of rack gear

The utility model relates to a kind of rack gear, and especially tooth bar is rack gear flexible, that can carry out the arcuation engagement around gear.

Common rack gear is made up of the gear of rigidity and the tooth bar of rigidity, and tooth bar is a flat, and in gear and the tooth bar engagement driving process, or the rotation of gear is converted into the translation of tooth bar; Or the translation of tooth bar is converted into the rotation of gear.Tooth bar all can only can only be done back and forth the reciprocal translation of 180 ° of tunings along the tangent direction and the gear engagement of gear.When this structure need to be used to gear that rotation is converted into the reciprocal translation of 180 ° of the non-tunings back and forth of tooth bar, can't realize transmission.

The purpose of this utility model provides a kind of tooth bar transmission, and it can not only be converted into the rotation of gear the translation of tooth bar, and can easily make this translation, becomes non-reciprocal translation of just adjusting back on a tangent direction of gear to 180 °.

The purpose of this utility model is achieved in that design one rack gear, this mechanism is with replacing rigid toothed in the common rack gear around rigid gear and with the flexible rack of rigid gear engagement, at the two ends of flexible rack by certain Placement, each end at the two ends of flexible rack is all linked to each other with the moving body that is connected with the flexible rack two ends that the motion of need by flexible rack drives respectively. make this mechanism in transmission, when motion is converted into the translation of flexible rack by the rotation of gear, the moving body that is connected with the flexible rack two ends is along with flexible rack moves. and, because flexible rack is engagement on the gear to gear meshing, flexible rack has two point of contacts on gear, the position at this two point of contact changes the gear engagement degree change with flexible rack, make this mechanism in the course of the work, the motion of the two-end-point of flexible rack, can be designed as can be in the motion on the different straight paths, promptly, non-the reciprocal translation of 180 ° of tunings back and forth, thereby satisfy and the moving body of flexible rack end points connection demand different reciprocal translation forms. and compare with the rigid toothed drive mechanism, when flexible rack reaches semicircle around the curved portion of gear engagement, when the mutual motion of the moving body that the flexible rack two ends connect is parallel motion, can satisfy the transmission required distance and guarantee to stablize, under the situation, can make the size of mechanism on the tooth bar direction reduce about 50% reliably.Simultaneously, in order to guarantee effective engagement of flexible rack and gear, can design a supporting frame, make supporting frame have the pressing plate of arc. pressing plate is positioned at the outside of flexible rack and gear meshing part, gap delta between pressing plate and the flexible rack dorsal part should be enough little, thereby guarantee not take place between flexible rack and the gear to break away from engagement.

Owing to adopt such scheme, can solve the insurmountable transmission problem of common rigid toothed transmission, and simple in structure easily to realize.

Below in conjunction with paying figure and embodiment the utility model is further specified.

Figure the-1st, after the utility model was contained in the power box, plan view was installed in the application on Chinese utility model patent ZL9622586.X operator cabin (cabin) front window Motorized blind device.Figure-A, figure-A ' are respectively the enlarged views of two local A and A ' among the figure-1.

Figure the-2nd, the mounting structure figure of the utility model in power box.

Figure the-3rd, the installation diagram of rigid toothed transmission in power box.

Figure the-4th, the enlarged view of figure-2.

Among the figure, 1, gap=R-R ' δ ', flexible rack tooth depth L, power box between power box 2, guide rail 3, elasticity abat vent 4, car 5, supporting frame 6, gear 7, flexible rack 8, pulling cable (the flexible rack end points connects moving body) 9, rigid toothed 10, pulley δ, supporting frame arc pressuring plate and the flexible rack back side outer wide, car runk inner width L1, power box inner width L2, power box inner width L ', maximum sunshade stroke L2＞2L '＞L＞L1＞L ' when adopting the rigid toothed transmission

In figure-1, figure-2, in order not destroy the inner structure of car (4) and attractive in appearance, when utility model patent ZL9622586.X implemented, elasticity abat vent (3) must be in car (4) ceiling be only installed and work in the high space about 15mm.So what elasticity abat vent (3) can only be open and flat is installed in car (4) ceiling, and work the time is only done translation and is not reeled.During work, the power box (1) that elasticity abat vent (3) is placed in the trunk of car (4) rear portion draws translation in the guide rail (2) that is installed on car (4) the ceiling left and right sides by pulling cable (8).Shown in figure-1, the position that car (4) front window all covered of elasticity abat vent (3) from figure-1, translation is arrived in the whole opening procedures of car (4) front window, and needing the stroke of motion is L '; Conversely, from the front window with car (4) all is opened to all coverage processes of front window with car (4), also must movement travel L '.That is, finish a front window with car (4) from the full standard-sized sheet that hides again by the process of standard-sized sheet to full screening, abat vent (3) needs the stroke of to-and-fro motion 2L '.In order to realize the exactly in the above-mentioned 2L ' stroke motion of elasticity abat vent (3), during utility model patent ZL9622586.X implements, on probation to the various kinds of drive on stand, determine the exactly motion of the realization elasticity abat vent (3) that the tooth bar kind of drive can be the most satisfactory.But shown in figure-3, if adopt the power box of rigid toothed transmission, the left end that above-mentioned to-and-fro motion stroke 2L ' shows as upper rack (9) right-hand member of movement travel L ' and following tooth bar (9) left moves right stroke L '.Shown in figure-2, if adopt the flexible rack transmission, the upper end that above-mentioned to-and-fro motion stroke 2L ' then shows as flexible rack (7) is movement travel L ' left, and the lower end moves right stroke L '.At this moment, as figure-1, figure-2, shown in the figure-3, when the inner width of car (4) trunk is L, adopting the inner width of the power box of rigid toothed transmission is L2.The inner width of power box (1) is L1.And several width correlations are L2＞2L '＞L＞L1＞L '.And the degree of L＞L1 is considerably beyond the required space of power box (1) casing wall thickness.The power box of significantly scheming the employing rigid toothed transmission shown in-3 as can be seen can't satisfy the requirement of car (4) luggage boot size.Make utility model patent ZL9622586.X when car (4) is gone up specifically installation enforcement, used the power box (1) of flexible rack transmission instead, at this moment, as long as shown in figure-1, power box (1) outer wide is designed to the same wide with the inner width of car (4) trunk, or narrow slightly, just satisfied of the requirement of car (4) luggage boot width easily to the outer wide size of power box (1).Make utility model patent ZL9622586.X on car (4), obtain the most satisfactory enforcement.

Shown in figure-4, in the power box (1) that adopts the flexible rack transmission, for preventing to come off in flexible rack (7) the transmission engagement, the inventor has also designed supporting frame (5) flexible rack has been supported.Gapped δ between the arc pressuring plate of supporting frame (5) and the flexible rack back side.δ has well guaranteed not break away from engagement in flexible rack (7) engagement process less than the tooth depth δ ' of flexible rack (7).

The flexible rack driving mechanism has played the effect that rigid toothed transmission and other driving mechanism can't play in sum in the more perfect implementation process of utility model patent ZL9622586.X!

Claims

1, a kind of rack gear, it is characterized in that mechanism has replaced rigid toothed (9) in the common tooth bar transmission with flexible rack (7), flexible rack (7) meshes around gear (6), and the arc pressuring plate on the supporting frame (5) prevents flexible rack (7) and the out-of-gear support of gear (6) to the outside of flexible rack (7) and gear (6) mate; The two ends of flexible rack (7) are connected moving body (8) respectively and link to each other with the flexible rack end points; During transmission, gear (6) rotates and drives flexible rack (7) translation, and flexible rack (7) drives the flexible rack end points and connects moving body (8) motion, makes the rotation of gear (6) become the motion that the flexible rack end points connects moving body (8).