CA1207561A - Mechanical gear-changing device - Google Patents
Mechanical gear-changing deviceInfo
- Publication number
- CA1207561A CA1207561A CA000441846A CA441846A CA1207561A CA 1207561 A CA1207561 A CA 1207561A CA 000441846 A CA000441846 A CA 000441846A CA 441846 A CA441846 A CA 441846A CA 1207561 A CA1207561 A CA 1207561A
- Authority
- CA
- Canada
- Prior art keywords
- selector
- gear
- rails
- box
- selector rails
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/08—Multiple final output mechanisms being moved by a single common final actuating mechanism
- F16H63/20—Multiple final output mechanisms being moved by a single common final actuating mechanism with preselection and subsequent movement of each final output mechanism by movement of the final actuating mechanism in two different ways, e.g. guided by a shift gate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H2063/3079—Shift rod assembly, e.g. supporting, assembly or manufacturing of shift rails or rods; Special details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/32—Gear shift yokes, e.g. shift forks
- F16H2063/325—Rocker or swiveling forks, i.e. the forks are pivoted in the gear case when moving the sleeve
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/32—Gear shift yokes, e.g. shift forks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
- F16H63/30—Constructional features of the final output mechanisms
- F16H63/34—Locking or disabling mechanisms
- F16H63/36—Interlocking devices
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Gear-Shifting Mechanisms (AREA)
- Structure Of Transmissions (AREA)
- General Details Of Gearings (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A mechanical gear changing device in a gear change box for motor vehicles, for engaging and disengaging positive drive clutches, with selector rails of rectangular cross-section running parallel with the gear-box shaft and each associated with a channel in the basic gearbox, the selector rails being arranged as a set and for example at an angle of 45° to the centre of the gear-box shaft, and being mounted in the gear-box housing. The selector rails are provided with recess in which drivers, with rounded contact surfaces, are engaged by gear change levers mounted in the gear-box housing and/or gear change fingers arranged, for example, upon a selector shaft, or are secured to selector forks with selector rails. All of the selector rails (2,3,4), of similar cross-section, are mounted directly and jointly in the gear-box housing at least at two locations and are adapted to pivot through 90° in order to co-operate with the selector fingers(91,92,93) arranged approx-imately vertically or horizontally. The common centre of rotation of the selector rail is arranged in such a manner that the same gear change levers or selector forks are actuated by the associated selector rails and that the respective gear change levers and/or selector forks associated with the channels remain unchanged as regards position and shape. The selector rails are preferably guided in circular bearing bushes (8,80) securable to the housing, each also carrying a locking plate which is specially shaped and is provided with an opening and, in the case of a group transmission, a blocking plate (65), co-operating with the selector rails and passing partly through the recesses. The locking plate is actuated positively by a selector rail provided with notches (23,33,43) in an end recess (24,34,44) when it is shifted to an operative position. The other two selector rails are locked by radial displacement or pivoting. The locking device requires only this one locking plate, whereas the other parts are already present in the cir-cuit and may be easily adapted. Under the action of a spring (99), blocking plate (65) presses a nose(68)at all times against a control cam(96)on selector rail 95 for the group transmission and blocks the selector rails (2,3,4) of the basic gear-box during a gear change in the group transmission when the said nose engages in indentation(97)in control cam (96).
A mechanical gear changing device in a gear change box for motor vehicles, for engaging and disengaging positive drive clutches, with selector rails of rectangular cross-section running parallel with the gear-box shaft and each associated with a channel in the basic gearbox, the selector rails being arranged as a set and for example at an angle of 45° to the centre of the gear-box shaft, and being mounted in the gear-box housing. The selector rails are provided with recess in which drivers, with rounded contact surfaces, are engaged by gear change levers mounted in the gear-box housing and/or gear change fingers arranged, for example, upon a selector shaft, or are secured to selector forks with selector rails. All of the selector rails (2,3,4), of similar cross-section, are mounted directly and jointly in the gear-box housing at least at two locations and are adapted to pivot through 90° in order to co-operate with the selector fingers(91,92,93) arranged approx-imately vertically or horizontally. The common centre of rotation of the selector rail is arranged in such a manner that the same gear change levers or selector forks are actuated by the associated selector rails and that the respective gear change levers and/or selector forks associated with the channels remain unchanged as regards position and shape. The selector rails are preferably guided in circular bearing bushes (8,80) securable to the housing, each also carrying a locking plate which is specially shaped and is provided with an opening and, in the case of a group transmission, a blocking plate (65), co-operating with the selector rails and passing partly through the recesses. The locking plate is actuated positively by a selector rail provided with notches (23,33,43) in an end recess (24,34,44) when it is shifted to an operative position. The other two selector rails are locked by radial displacement or pivoting. The locking device requires only this one locking plate, whereas the other parts are already present in the cir-cuit and may be easily adapted. Under the action of a spring (99), blocking plate (65) presses a nose(68)at all times against a control cam(96)on selector rail 95 for the group transmission and blocks the selector rails (2,3,4) of the basic gear-box during a gear change in the group transmission when the said nose engages in indentation(97)in control cam (96).
Description
The present invention relates to a mechanical gear changing device, namely a mechanical gear changing device, in a gear change box for motor vehicles, for engaging and disengaging positive drive clutches, with selector rails of rectangular cross-section running parallel with the gear-box shaft and each associated with a channel in the basic gear-box, the selector rails being arranged as a set, for example at an angle of 45 to the centre of the gear-box shaft and being mounted in the gear-box housing, the selector rails being provided with recesses in which drivers, with rounded contact surfaces, are engaged by gear change levers mounted in the gear-box housing and/or gear change fingers arranged, for example, upon a selector shaft, or are secured to selector forks with selector rails. The device being for gear-change boxes with several speeds in a so-called basic gear-box and also for gear change boxes which consist of such a basic gear-box and of a group transmission coooperating with, and flanged to, the said basic gear-box and/or a "split" gear-box.
A modern arrangement of this kind is known from German patent 28 05 044, such gives satisfactory results as regards efficiency, simplicity and assembly. However, this prior art design is unusually specialized and cannot be used for all transmission installations.
It is therefore a prime aim of the present invention to improve the mechanical gear change device in accordance with the prior art in such a manner that it is more universally applicable to the design and installation of gear-boxes, and can quite easily be completed with safety and other devices necessary for a gear-box, the shifting operation of such being smooth and the unit being easily assemb-ed and having only a small number of different parts.
The aforementioned aim is accomplished by providing, in accordance with the present invention a mechanical gear 1207S6~
changing device, in a gear change box for motor vehicles, for engaging and disengaging positive drive clutches, with selector rails of rectangular cross-section running parallel with the gear-box shaft and each associated with a channel in the basic gear-box, the selector rails being arranged as a set, for example at an angle of 45 to the centre of the gear-box shaft and being mounted in the gear-box housing, the selector rails being provided with recesses in which drivers, with rounded contact surfaces, are engaged by gear change levers mounted in the gear-box housing and/or gear change fingers arranged, for example, upon a selector shaft, or are secured to selector forks with selector rails, wherein all of the selector rails, of similar cross-section, are mounted directly and jointly in the gear-box housing at least at two locations and are adapted to pivot through 90 in order to cooperate with the selector fingers arranged approximately vertically or horizontally, in that tlle common centre of rotation of the associated selector rails is arranged in such a manner that the same gear change levers or selector forks are actuated by the associated selector rails, and in that the respective gear change levers and/or selector forks, associated with the channels, remain unchanged as regards position and shape.
Since the selector rail unit is mounted in at least two locations in the gear-box housing, this provides very stable guidance, relatively high efficiency, and also has the advantage of making it possible to arrange the selector rails either transversely or on edge, in relation to the upright gear-box, so that the rotating shaft can be arranged either transversely or laterally uprightly, in relation to the gear-box, with no changes being required in the shape of the selector rails or in the shape and position of the gear change levers and any selector forks that may be present. It is also possible to use the same parts, all that is required in the case of an existing selector for secured to a selector rail, being an arrangement displaced through 90 between the said fork ~nd rail. If the reverse gear is actuated with a gear lever, as in the case of a 5-speed box, even this small additional expense is eliminated.
Other embodiments provide a particularly advantages configuration of the invention. For instance, if the selector rail assembly is mounted in circular bushes arranged in the housing, it is a particularly simple matter to pivot the rails through 90 since only the bushes need be rotated through this angle. At least one bush may be secured quite simply, e.g.
by means of adjusting shims, an attachment screw, and appropriate incorporation into the bush, or, in the case of a divided housing, by means of a nub on the bush projecting into a bore in the housing. If a selector fork secured to the selector rail is used of a reverse gear, for example, it is a simple matter to use this fork also for securing.
The arrangement of à locking dévice according to a further embodiment, in the vicinity of the selector rails ~O themselves, and in the form of a locking plate located at right angles to the selector rails and cooperating therewith, is particularly simple, since the only additional part required is the locking plate. If the locking plate is of a suitable configuration, the operation of the locking device is reliable.
Any suitable design may be used. The locking plate is also positively guided - one selector rail shifted into one speed locking the other two rails by means of the locking plate, a feature which contributes to reliable operation. If the locking plate is secured axially, for example in a circular recess in the housing, by one of the bearing bushes for the selector rails, then the only addition necessary is this circular recess in the housing, and this can be readily and simply provided in known fashion`in the one bearing bush, notwithstanding ~Z07561 the locking device, A guide pin, for example in the form of a non-machined nub in the bearing bush is simple and inexpensive to produce. This nub, in conjunction with a slot suitably arranged in the locking plate, provides adequate guidance for the radial and pivoting motions of the locking plate.
Suitable configuration of the recess provided in the end faces of the selector rails, ana of the notches arranged in these recesses in the vicinity of the locking plate, involves no extra tooling costs since the existing selector rails need not be enlarged and this configuration for the locking device may be produced in the same operation as that used to produce the selector rails themselves, namely a precision stamping process.
In conjunction with the configuration of the selector rails, the special configuration of the locking plate, opening, and arcuate recess provides, in conjunction with the config-uration of the selector rails, not only simple but also very effective locking by positive guidance of two motions in the radial direction and during pivoting, which is effected by the movement of only one selector rail.
If each of the selector rails comprises all recesses for engagement of the gear change lever drivers, then, par-ticularly if the reverse gear is also actuated by a gear change lever, all the selector rails, or at least the two external ones, will be the same in principle.
The mounting of this group of selector rails by stud-like elements in conjunction with holes in the housing has advantage, especially if for example, the said group of selector rails is held in the desired position by the reverse gear selector fork.
The production of the selector rails by precision lZ~7S~l stamping process not only ensures accuracy but improves assembly because it eliminates all adjustments and adaptations, it also rationalizes production, especially if many of the se-lector rails are of the same shape and if a selector rail can be made in a single operation. Rationalized production of the locking plate can also be achieved by utilizing the precision stamping process.
If the gear change box is designed in group form with a basic gear-box, an additional blocking plate can be arranged rotatably quite simply, like the locking plate, in the vicinity of the bearing bush, the blocking plate being controlled by the selector rail actuated, for example, by an auxiliary force, in conjunction with a spring. The blocking plate blocks all of the selector rails of the basic gear-box until the group transmission reaches a selected position.
According to a further embodiment of the invention, the structural configuration is very simple and the parts used for the blocking device are those which are already required for group selection and for selecting the basic gear-box. Thus the only additional parts required are the blocking plate and the spring - possibly a simple compression spring.
The special configuration of the blocking plate according to further embodiments makes reliable blocking possible with the smallest pivoting motion.
The indentation in the control cam, with its trans-ition ramps, is simple in shape and can also be produced by precision stamping.
If the blocking plate is otherwise supported during selection of the group transmission and externally of the pivoting motion, friction at the control nose can be prevented Since, as already stated in connection with the ad-vantages of first embodiments mentioned, securing of the iZ~7S61 selector rail groups may be accomplished quite simply by means of a special device in conjunction with a bearing bush, or with a reverse speed fork, no special devices at all are needed in the case of gear change boxes according to ones of embodi-ments mentioned, since the selector rail for the group trans-mission can also lock the bearing bush, and thus the selector rails, in both positions. Also of particular advantage is the one only mounting and support for the spring in the housing in two positions of the selector rails.
Selector rails mounted in a housing are known from German OS 30 00 577, however these are of circular cross-section, mounted individually in the gear-box housing, and wherein adjustrnents are also necessary during assembly, es-pecially between the selector fingers and the selector rails.
As described in the last paragraph on page 7 of the aforementioned reference, such gear-boxes have an addition-al idler shaft for accommodating a locking device for un-selected channels, however, this requires a relatively larger amount of space and also production cost. German OS 30 00 577 discloses a subskantially more satisfactory solution - i.e.
locking discs on the selector-shaft, however such cannot be used for selecting device of the type in question since,in this instance, selector fingers 21,22 are not provided for each selector rail, do not engage directly therein, and move axially with the selector shaft upon channel selection.
German OS 22 23 553 discloses a locking device to prevent double selections i.e. engagement of more than one speed - in the vicinity of the selector rails. The latter, however, are not arranged as a group but are mounted in-dividually in khe gear-box housing, and are of circular cross-section. Locking is effected by means of balls and thrust pieces in holes arranged at right angles to the selector 12~)7561 rails, in cooperation with grooves in the selector rails.
Further details of the invention are explained here-inafter in conjunction with the examples of embodiment illust-rated in the drawings attached hereto, wherein:
Figure 1 is a partial cross-sectional view of a motor vehicle gear-box in the axial direction with clutches and a selecting device, in side elevation, Figure 2 is a partial cross-sectional view taken along line II-II in Figure 1, Figure 3 is a partial cross-sectional view taken at right angles to the selector rails shown in Figure 1, in the vicinity of the bearing bushes;
Figure 4 is a partial cross-sectional view similar to that of Figure 3, but with the bearing bush rotated through 90, Figure 5 is a partial cross-sectional view similar to that of Figure 3, but in the vicinity of a clutch, Figure 6 is a partial cross-sectional view similar to that of Figure 5, but with a selector fork, Figure 7 is a partial cross-sectional view of a bearing location in the selector rail group, with machined journals, Figure 8 is a partial cross-section, in side elevation, taken through the gear-box housing with a locking device in the circuit;
Figure 9 is a partial cross-sectional view taken along line IX-IX in Figure 8 in the setting, central selector rail selected, Figure 10 is a partial cross-sectional view similar to that of Figure 9, but in the setting, one outer selector rail is selected, Figure 11 is a partial cross-sectional view taken `` ~2~756~
along line XI-XI in Eigure 12 namely according to Figure 8 with another blocking plate between the bearing bush and the gear-box housing, Figure 12 is a partial cross-sectional view taken along line XII-XII in Figure 11 in the vicinity of the blocking plate.
The gear-box shown in part in Eigure 1 (side elevation) and Figure 2 (plan view) is intended for motor vehicles of higher power, i.e. commercial vehicles. At least as regards basic gear-box 1, gear-changing is carried out man-ually by the driver, the selecting movement being transferred from a hand lever (not shown), through conventional element, also not shown, to a selector shaft 9 in basic gear-box 1.
The basic gear-box, in this case a synchro-mesh gear-box having five forward speeds and a reverse, comprises three clutches 5, 7 and 70 arranged as positive drive clutches in dual design upon a gear-box shaft 12, for the purpose of connecting this shaft selectively to one of gears 13 mounted rotatably thereon. These gears are in permanent engagement with other gears in the basic gear-box. In order to be able to engage sliding sleeves 51,71,710 of clutches 5,7,70, which sleeves can move axially along, but cannot rotate upon, the gear-box shaft, selectively with the teeth on gears 13, long-itudinally guided selector rails 2,3,4 are arranged in housing 11. These rails are displaced longitudinally by selector fingers 91,92,93 each pivoted in known fashion by selector shaft 9. Engaging in recesses 21,31,41 in selector rails 2,3,4 are drivers 53,73,730 on gear shift levers 52,72,720 having circular contact surfaces in the direction of movement. The said gear shi~t levers are mounted in known fashion rotatably in gear box housing 11, whereas the said selector rails are mounted, for example with circular bearing ~2C~7S6~
bushes ~3, in gear-box housing 11 in such a manner that they can be locked in two positions (Figures 3,4) differing by an angle of 90. The change in the position of selector rails 2,3,4 is effected by rotating bearing bushes 8, of which at least two are provided, in circular recesses, for example, in gear-box housing 1~, locking being effected, for example, by attachment screws 14 in gear-box 11 and by shims 82 in centering recesses 83 to bearing bushes 8 (Figure 4).
Readily seen in Figure 2 is the engagement of drivers 52,73,730 on gear shift levers 52,72,720 in recesses 21,31,41 in selector rails 2,3,4 the said selector rails running at right angles to the horizontally arranged gear-box.
If selector shaft (rotating shaft) 9 - which can be mounted in its own housing 94 adapted to be mounted in two different positions (horizontally or vertically in relation to, for example, the horizontally arranged gear-box) upon gear-box housing 11 - is displaced through 90, then selector rail group 10 is also rotated through 90. Thus selector fingers 91,92,93, arranged upon selector shaft 9, still engage in relevant selector rails 2,3,4.
The engagement of drivers 53,73,730, associated with the two positions of selector rail group 10, in recesses 21,31,41 in the selector rails is shown in Figure 5, for ex-ample for a gear shift lever 72 of a clutch 7.
Figure 6 shows the two attachments of a selector fork 49, e.g. by welding to the reverse gear selector rail 40 if, in the case of a 4-speed gear-box, the reverse gear is selected, not by a shift lever 72, but by a selector fork 4 moving in parallel with selector rail 40.
The arrangement according to Figures 1 to 5, also makes it possible for at least the two outer selector rails
A modern arrangement of this kind is known from German patent 28 05 044, such gives satisfactory results as regards efficiency, simplicity and assembly. However, this prior art design is unusually specialized and cannot be used for all transmission installations.
It is therefore a prime aim of the present invention to improve the mechanical gear change device in accordance with the prior art in such a manner that it is more universally applicable to the design and installation of gear-boxes, and can quite easily be completed with safety and other devices necessary for a gear-box, the shifting operation of such being smooth and the unit being easily assemb-ed and having only a small number of different parts.
The aforementioned aim is accomplished by providing, in accordance with the present invention a mechanical gear 1207S6~
changing device, in a gear change box for motor vehicles, for engaging and disengaging positive drive clutches, with selector rails of rectangular cross-section running parallel with the gear-box shaft and each associated with a channel in the basic gear-box, the selector rails being arranged as a set, for example at an angle of 45 to the centre of the gear-box shaft and being mounted in the gear-box housing, the selector rails being provided with recesses in which drivers, with rounded contact surfaces, are engaged by gear change levers mounted in the gear-box housing and/or gear change fingers arranged, for example, upon a selector shaft, or are secured to selector forks with selector rails, wherein all of the selector rails, of similar cross-section, are mounted directly and jointly in the gear-box housing at least at two locations and are adapted to pivot through 90 in order to cooperate with the selector fingers arranged approximately vertically or horizontally, in that tlle common centre of rotation of the associated selector rails is arranged in such a manner that the same gear change levers or selector forks are actuated by the associated selector rails, and in that the respective gear change levers and/or selector forks, associated with the channels, remain unchanged as regards position and shape.
Since the selector rail unit is mounted in at least two locations in the gear-box housing, this provides very stable guidance, relatively high efficiency, and also has the advantage of making it possible to arrange the selector rails either transversely or on edge, in relation to the upright gear-box, so that the rotating shaft can be arranged either transversely or laterally uprightly, in relation to the gear-box, with no changes being required in the shape of the selector rails or in the shape and position of the gear change levers and any selector forks that may be present. It is also possible to use the same parts, all that is required in the case of an existing selector for secured to a selector rail, being an arrangement displaced through 90 between the said fork ~nd rail. If the reverse gear is actuated with a gear lever, as in the case of a 5-speed box, even this small additional expense is eliminated.
Other embodiments provide a particularly advantages configuration of the invention. For instance, if the selector rail assembly is mounted in circular bushes arranged in the housing, it is a particularly simple matter to pivot the rails through 90 since only the bushes need be rotated through this angle. At least one bush may be secured quite simply, e.g.
by means of adjusting shims, an attachment screw, and appropriate incorporation into the bush, or, in the case of a divided housing, by means of a nub on the bush projecting into a bore in the housing. If a selector fork secured to the selector rail is used of a reverse gear, for example, it is a simple matter to use this fork also for securing.
The arrangement of à locking dévice according to a further embodiment, in the vicinity of the selector rails ~O themselves, and in the form of a locking plate located at right angles to the selector rails and cooperating therewith, is particularly simple, since the only additional part required is the locking plate. If the locking plate is of a suitable configuration, the operation of the locking device is reliable.
Any suitable design may be used. The locking plate is also positively guided - one selector rail shifted into one speed locking the other two rails by means of the locking plate, a feature which contributes to reliable operation. If the locking plate is secured axially, for example in a circular recess in the housing, by one of the bearing bushes for the selector rails, then the only addition necessary is this circular recess in the housing, and this can be readily and simply provided in known fashion`in the one bearing bush, notwithstanding ~Z07561 the locking device, A guide pin, for example in the form of a non-machined nub in the bearing bush is simple and inexpensive to produce. This nub, in conjunction with a slot suitably arranged in the locking plate, provides adequate guidance for the radial and pivoting motions of the locking plate.
Suitable configuration of the recess provided in the end faces of the selector rails, ana of the notches arranged in these recesses in the vicinity of the locking plate, involves no extra tooling costs since the existing selector rails need not be enlarged and this configuration for the locking device may be produced in the same operation as that used to produce the selector rails themselves, namely a precision stamping process.
In conjunction with the configuration of the selector rails, the special configuration of the locking plate, opening, and arcuate recess provides, in conjunction with the config-uration of the selector rails, not only simple but also very effective locking by positive guidance of two motions in the radial direction and during pivoting, which is effected by the movement of only one selector rail.
If each of the selector rails comprises all recesses for engagement of the gear change lever drivers, then, par-ticularly if the reverse gear is also actuated by a gear change lever, all the selector rails, or at least the two external ones, will be the same in principle.
The mounting of this group of selector rails by stud-like elements in conjunction with holes in the housing has advantage, especially if for example, the said group of selector rails is held in the desired position by the reverse gear selector fork.
The production of the selector rails by precision lZ~7S~l stamping process not only ensures accuracy but improves assembly because it eliminates all adjustments and adaptations, it also rationalizes production, especially if many of the se-lector rails are of the same shape and if a selector rail can be made in a single operation. Rationalized production of the locking plate can also be achieved by utilizing the precision stamping process.
If the gear change box is designed in group form with a basic gear-box, an additional blocking plate can be arranged rotatably quite simply, like the locking plate, in the vicinity of the bearing bush, the blocking plate being controlled by the selector rail actuated, for example, by an auxiliary force, in conjunction with a spring. The blocking plate blocks all of the selector rails of the basic gear-box until the group transmission reaches a selected position.
According to a further embodiment of the invention, the structural configuration is very simple and the parts used for the blocking device are those which are already required for group selection and for selecting the basic gear-box. Thus the only additional parts required are the blocking plate and the spring - possibly a simple compression spring.
The special configuration of the blocking plate according to further embodiments makes reliable blocking possible with the smallest pivoting motion.
The indentation in the control cam, with its trans-ition ramps, is simple in shape and can also be produced by precision stamping.
If the blocking plate is otherwise supported during selection of the group transmission and externally of the pivoting motion, friction at the control nose can be prevented Since, as already stated in connection with the ad-vantages of first embodiments mentioned, securing of the iZ~7S61 selector rail groups may be accomplished quite simply by means of a special device in conjunction with a bearing bush, or with a reverse speed fork, no special devices at all are needed in the case of gear change boxes according to ones of embodi-ments mentioned, since the selector rail for the group trans-mission can also lock the bearing bush, and thus the selector rails, in both positions. Also of particular advantage is the one only mounting and support for the spring in the housing in two positions of the selector rails.
Selector rails mounted in a housing are known from German OS 30 00 577, however these are of circular cross-section, mounted individually in the gear-box housing, and wherein adjustrnents are also necessary during assembly, es-pecially between the selector fingers and the selector rails.
As described in the last paragraph on page 7 of the aforementioned reference, such gear-boxes have an addition-al idler shaft for accommodating a locking device for un-selected channels, however, this requires a relatively larger amount of space and also production cost. German OS 30 00 577 discloses a subskantially more satisfactory solution - i.e.
locking discs on the selector-shaft, however such cannot be used for selecting device of the type in question since,in this instance, selector fingers 21,22 are not provided for each selector rail, do not engage directly therein, and move axially with the selector shaft upon channel selection.
German OS 22 23 553 discloses a locking device to prevent double selections i.e. engagement of more than one speed - in the vicinity of the selector rails. The latter, however, are not arranged as a group but are mounted in-dividually in khe gear-box housing, and are of circular cross-section. Locking is effected by means of balls and thrust pieces in holes arranged at right angles to the selector 12~)7561 rails, in cooperation with grooves in the selector rails.
Further details of the invention are explained here-inafter in conjunction with the examples of embodiment illust-rated in the drawings attached hereto, wherein:
Figure 1 is a partial cross-sectional view of a motor vehicle gear-box in the axial direction with clutches and a selecting device, in side elevation, Figure 2 is a partial cross-sectional view taken along line II-II in Figure 1, Figure 3 is a partial cross-sectional view taken at right angles to the selector rails shown in Figure 1, in the vicinity of the bearing bushes;
Figure 4 is a partial cross-sectional view similar to that of Figure 3, but with the bearing bush rotated through 90, Figure 5 is a partial cross-sectional view similar to that of Figure 3, but in the vicinity of a clutch, Figure 6 is a partial cross-sectional view similar to that of Figure 5, but with a selector fork, Figure 7 is a partial cross-sectional view of a bearing location in the selector rail group, with machined journals, Figure 8 is a partial cross-section, in side elevation, taken through the gear-box housing with a locking device in the circuit;
Figure 9 is a partial cross-sectional view taken along line IX-IX in Figure 8 in the setting, central selector rail selected, Figure 10 is a partial cross-sectional view similar to that of Figure 9, but in the setting, one outer selector rail is selected, Figure 11 is a partial cross-sectional view taken `` ~2~756~
along line XI-XI in Eigure 12 namely according to Figure 8 with another blocking plate between the bearing bush and the gear-box housing, Figure 12 is a partial cross-sectional view taken along line XII-XII in Figure 11 in the vicinity of the blocking plate.
The gear-box shown in part in Eigure 1 (side elevation) and Figure 2 (plan view) is intended for motor vehicles of higher power, i.e. commercial vehicles. At least as regards basic gear-box 1, gear-changing is carried out man-ually by the driver, the selecting movement being transferred from a hand lever (not shown), through conventional element, also not shown, to a selector shaft 9 in basic gear-box 1.
The basic gear-box, in this case a synchro-mesh gear-box having five forward speeds and a reverse, comprises three clutches 5, 7 and 70 arranged as positive drive clutches in dual design upon a gear-box shaft 12, for the purpose of connecting this shaft selectively to one of gears 13 mounted rotatably thereon. These gears are in permanent engagement with other gears in the basic gear-box. In order to be able to engage sliding sleeves 51,71,710 of clutches 5,7,70, which sleeves can move axially along, but cannot rotate upon, the gear-box shaft, selectively with the teeth on gears 13, long-itudinally guided selector rails 2,3,4 are arranged in housing 11. These rails are displaced longitudinally by selector fingers 91,92,93 each pivoted in known fashion by selector shaft 9. Engaging in recesses 21,31,41 in selector rails 2,3,4 are drivers 53,73,730 on gear shift levers 52,72,720 having circular contact surfaces in the direction of movement. The said gear shi~t levers are mounted in known fashion rotatably in gear box housing 11, whereas the said selector rails are mounted, for example with circular bearing ~2C~7S6~
bushes ~3, in gear-box housing 11 in such a manner that they can be locked in two positions (Figures 3,4) differing by an angle of 90. The change in the position of selector rails 2,3,4 is effected by rotating bearing bushes 8, of which at least two are provided, in circular recesses, for example, in gear-box housing 1~, locking being effected, for example, by attachment screws 14 in gear-box 11 and by shims 82 in centering recesses 83 to bearing bushes 8 (Figure 4).
Readily seen in Figure 2 is the engagement of drivers 52,73,730 on gear shift levers 52,72,720 in recesses 21,31,41 in selector rails 2,3,4 the said selector rails running at right angles to the horizontally arranged gear-box.
If selector shaft (rotating shaft) 9 - which can be mounted in its own housing 94 adapted to be mounted in two different positions (horizontally or vertically in relation to, for example, the horizontally arranged gear-box) upon gear-box housing 11 - is displaced through 90, then selector rail group 10 is also rotated through 90. Thus selector fingers 91,92,93, arranged upon selector shaft 9, still engage in relevant selector rails 2,3,4.
The engagement of drivers 53,73,730, associated with the two positions of selector rail group 10, in recesses 21,31,41 in the selector rails is shown in Figure 5, for ex-ample for a gear shift lever 72 of a clutch 7.
Figure 6 shows the two attachments of a selector fork 49, e.g. by welding to the reverse gear selector rail 40 if, in the case of a 4-speed gear-box, the reverse gear is selected, not by a shift lever 72, but by a selector fork 4 moving in parallel with selector rail 40.
The arrangement according to Figures 1 to 5, also makes it possible for at least the two outer selector rails
2,4 to be of exactly the same shape, if the recessions for the _g_ ~Z~7~
two positions and d~ivers 53,73 of gear shift levers 52,72 are fitted. If the selector rails are produced by stamping, pre-ferably precision stamping, this facilitates both stock keeping and produc-tion.
As seen in Figure 7, a journal ]01 may be machined at bo-th ends of selector rail group 100, flats 102 being provided on the two outer selector rails 20,40 and the said journals being preferably rnoun-ted in bushes 112 secured in housing 110. This arrangement can be used, however, only if centering of selector rail group 100 is effected by means of a selector fork secured to the selector rail.
Figure 8 shows mainly the locking means only.
Arranged in a first circular recess 111 in gear-box housing 1 is a bearing bush 8 which is secured -to the gear-box housing, and thus covers a second circular recess 113, concentric with the first recess, in which locking plate 6 is arranged. Locking plate 6 is guided upon a pin, preferably a nub 84, projecting axially from bearing bush 8, by means of a slot 61. This allows the locking plate to move in the direction of upright selector rails 2,3,4 and also to pivot at right angles thereto, since the diameter of the locking plate is smaller than that of second circular recess 113 in gear-box housing 11. Locking plate 6 may also be guided upon a pin or bolt secured in gear-box housing 11.
Selector rails 2,3,4 outer rails 2,4 for example, being a~ the same design - carry at one end, in the vicinity of bearing bush 8 and locking plate 6, recesses 24,34,44 which are open at their ends. Recess 34 in central selector rail 3 is narrower, while outer rails 2,4 are wider and of similax design. In the vicinity o~ loc~ing plate 6, when the selector rails are in the neutral setting, no-tches 23,33,43 are arranged, in central selector rail 3, at the lower edge oE recess 3~
12~)756~
and in outer rails 2,4, at the upper edge, locking plate 6 engaging in these notches for the purpose of locking. Two selector rails are locked at all times whenever a selector rail is shifted from neutral into gear. Figures 9 and 10 are, in principle, cross-sections along the line IX-IX in Figure 8, except that in Figure 9, the central selector rail is shifted into a terminal position corresponding to a speed.
This central selector rail has raised locking plate 6 with its lower forked ends 32, so that arcuate recess 63 lies in notches 10 ~ 23,43 in outer selector rails 2,4, in the outer corner thereof.
The locking effect in area X thus makes shifting o~ the outer selector rails impossible.
In Figure 10, outer selector rail 4, shown on the right, has been shifted into gear, and the outer edge of notch ~3 has pivoted locking plate 6 over arcuate recess 63(Z). In this setting, central selector rail 3 is locked by contact Y of locking plate 6 into notch 33 of this selector rail, while left-hand outer selector rail 2 is locked into notch 23, as already described in connection with Figure 2. Locking plate 6 may be supported in slot 61, but also in notch 33 of central selector rail 3.
Figure 11 is, in principle, a cross-section along the line IX-IX in Figure 8, but with an additional blocking plate 65 to block selector rails 2,3,4, when the selection of group transmission 10, effected mainly by auxiliary force, is not yet concluded - the selector rails are free only when the group transmission is selected - while Figure 12 shows the arrangement of blocking plate 65 and selector rail 95 as shown in Figure 11. Blocking plate 65 may be pivoted by pins or nubs 86 arranged on the bearing bush and an opening 67 cooperates with forked ends 220,320,420. Spring 99,mounted in bore 17 in gear-box housing 11, presses nose 68, through 120756~
lever 69, at all times against selector rail 95. In the vicinity of nose 68, this has a control cam 96 which, in the case of a two-speed group transmission, for example, consists of an indentation 79 and the two diameters, directly adjoining the indentation, of a circular selector rail, for example. The selector rails of basic gear-box 1 are guided in bearing bush 80, as already described in connection with bearing bush 8. The method of operation of the blocking plate is as follows.
In the two axial terminal positions of the selector rail - group transmission 10 is selected by a gear shift lever not shown - which is displaced, for example, by an auxiliary force, nose 68 of blocking plate 65 bears upon the outside diameter of selector rail 95. In this position, all three selector rails 2,3,4 of basic gear-box 1 are free and may be displaced axially at will. If, when selector rail 95 is moved out of its terminal position, nose 68 enters indentation 97 in control cam 96, blocking noses 66 engage, as a result of the pivoting movement of blocking plate 65, in notches 321,421 of selector rails 3,4 so that these cannot be moved and all forward speeds, for example, are locked.
Simultaneously, and in the same way, reverse gear rail 2 is locked in lower notch 222.
Blocking plate 65 may also be supported, during the selection process, in the group transmission and, outside the pivoting range, on bearing bush 80 on the, or one of the, selector rails 2,3,4 of the basic gear-bo~, or also in gear-box housing 11, thus Ieaving a gap 98 between the bottom of indentation 97 and the position of the control nose 68. It is also possible for blocking noses 66 for all three rails to be arranged to engage in cams 221,321,421 at upper forked ends 220,320,420. Selector rail 95 for group transrnission 10 also 1~37561 constitutes, in conjunction with recesses 87 in bearing bush 80, a means for securing the selector rails against rotation. If two recesses 87 arranged at 90 to each other, and pins or nubs 86, axe fitted to bearing bush 80, selector rails 2,3,4 may be arranged, as already described, rotated through 90, so that the selector shaft (rotating shaft) may be arranged horizontally or vertically. In both positions of the selector rails, bore 17 in gear-box housing 11 remains in the same position, when blocking plate 65 is moved accordingly, or if a separately adapted blocking plate is pro-vided for each position of the selector rails displaced through 90.
The present invention is not deemed restricted solely to the example of embodiment disclosed. For instance, it is also possible to secure bearing bush 8 against rotation by means of a nub or pin thereon which engages in a hole in gear-box housing l:L. This is particularly desirable if the bearing bush is fixed axially between two parts of the gear-box housing or, as shown in Figure 3, is held axially by means of an expanding ring 85.
two positions and d~ivers 53,73 of gear shift levers 52,72 are fitted. If the selector rails are produced by stamping, pre-ferably precision stamping, this facilitates both stock keeping and produc-tion.
As seen in Figure 7, a journal ]01 may be machined at bo-th ends of selector rail group 100, flats 102 being provided on the two outer selector rails 20,40 and the said journals being preferably rnoun-ted in bushes 112 secured in housing 110. This arrangement can be used, however, only if centering of selector rail group 100 is effected by means of a selector fork secured to the selector rail.
Figure 8 shows mainly the locking means only.
Arranged in a first circular recess 111 in gear-box housing 1 is a bearing bush 8 which is secured -to the gear-box housing, and thus covers a second circular recess 113, concentric with the first recess, in which locking plate 6 is arranged. Locking plate 6 is guided upon a pin, preferably a nub 84, projecting axially from bearing bush 8, by means of a slot 61. This allows the locking plate to move in the direction of upright selector rails 2,3,4 and also to pivot at right angles thereto, since the diameter of the locking plate is smaller than that of second circular recess 113 in gear-box housing 11. Locking plate 6 may also be guided upon a pin or bolt secured in gear-box housing 11.
Selector rails 2,3,4 outer rails 2,4 for example, being a~ the same design - carry at one end, in the vicinity of bearing bush 8 and locking plate 6, recesses 24,34,44 which are open at their ends. Recess 34 in central selector rail 3 is narrower, while outer rails 2,4 are wider and of similax design. In the vicinity o~ loc~ing plate 6, when the selector rails are in the neutral setting, no-tches 23,33,43 are arranged, in central selector rail 3, at the lower edge oE recess 3~
12~)756~
and in outer rails 2,4, at the upper edge, locking plate 6 engaging in these notches for the purpose of locking. Two selector rails are locked at all times whenever a selector rail is shifted from neutral into gear. Figures 9 and 10 are, in principle, cross-sections along the line IX-IX in Figure 8, except that in Figure 9, the central selector rail is shifted into a terminal position corresponding to a speed.
This central selector rail has raised locking plate 6 with its lower forked ends 32, so that arcuate recess 63 lies in notches 10 ~ 23,43 in outer selector rails 2,4, in the outer corner thereof.
The locking effect in area X thus makes shifting o~ the outer selector rails impossible.
In Figure 10, outer selector rail 4, shown on the right, has been shifted into gear, and the outer edge of notch ~3 has pivoted locking plate 6 over arcuate recess 63(Z). In this setting, central selector rail 3 is locked by contact Y of locking plate 6 into notch 33 of this selector rail, while left-hand outer selector rail 2 is locked into notch 23, as already described in connection with Figure 2. Locking plate 6 may be supported in slot 61, but also in notch 33 of central selector rail 3.
Figure 11 is, in principle, a cross-section along the line IX-IX in Figure 8, but with an additional blocking plate 65 to block selector rails 2,3,4, when the selection of group transmission 10, effected mainly by auxiliary force, is not yet concluded - the selector rails are free only when the group transmission is selected - while Figure 12 shows the arrangement of blocking plate 65 and selector rail 95 as shown in Figure 11. Blocking plate 65 may be pivoted by pins or nubs 86 arranged on the bearing bush and an opening 67 cooperates with forked ends 220,320,420. Spring 99,mounted in bore 17 in gear-box housing 11, presses nose 68, through 120756~
lever 69, at all times against selector rail 95. In the vicinity of nose 68, this has a control cam 96 which, in the case of a two-speed group transmission, for example, consists of an indentation 79 and the two diameters, directly adjoining the indentation, of a circular selector rail, for example. The selector rails of basic gear-box 1 are guided in bearing bush 80, as already described in connection with bearing bush 8. The method of operation of the blocking plate is as follows.
In the two axial terminal positions of the selector rail - group transmission 10 is selected by a gear shift lever not shown - which is displaced, for example, by an auxiliary force, nose 68 of blocking plate 65 bears upon the outside diameter of selector rail 95. In this position, all three selector rails 2,3,4 of basic gear-box 1 are free and may be displaced axially at will. If, when selector rail 95 is moved out of its terminal position, nose 68 enters indentation 97 in control cam 96, blocking noses 66 engage, as a result of the pivoting movement of blocking plate 65, in notches 321,421 of selector rails 3,4 so that these cannot be moved and all forward speeds, for example, are locked.
Simultaneously, and in the same way, reverse gear rail 2 is locked in lower notch 222.
Blocking plate 65 may also be supported, during the selection process, in the group transmission and, outside the pivoting range, on bearing bush 80 on the, or one of the, selector rails 2,3,4 of the basic gear-bo~, or also in gear-box housing 11, thus Ieaving a gap 98 between the bottom of indentation 97 and the position of the control nose 68. It is also possible for blocking noses 66 for all three rails to be arranged to engage in cams 221,321,421 at upper forked ends 220,320,420. Selector rail 95 for group transrnission 10 also 1~37561 constitutes, in conjunction with recesses 87 in bearing bush 80, a means for securing the selector rails against rotation. If two recesses 87 arranged at 90 to each other, and pins or nubs 86, axe fitted to bearing bush 80, selector rails 2,3,4 may be arranged, as already described, rotated through 90, so that the selector shaft (rotating shaft) may be arranged horizontally or vertically. In both positions of the selector rails, bore 17 in gear-box housing 11 remains in the same position, when blocking plate 65 is moved accordingly, or if a separately adapted blocking plate is pro-vided for each position of the selector rails displaced through 90.
The present invention is not deemed restricted solely to the example of embodiment disclosed. For instance, it is also possible to secure bearing bush 8 against rotation by means of a nub or pin thereon which engages in a hole in gear-box housing l:L. This is particularly desirable if the bearing bush is fixed axially between two parts of the gear-box housing or, as shown in Figure 3, is held axially by means of an expanding ring 85.
Claims (17)
1. A mechanical gear changing device, in a gear change box for motor vehicles, for engaging and disengaging positive drive clutches, with selector rails of rectangular cross-section running parallel with the gear-box shaft and each associated with a channel in the basic gear-box, the selector rails being arranged as a set for example at an angle of 45° to the centre of the gear-box shaft and being mounted in the gear-box housing, the selector rails being provided with recesses in which drivers, with rounded contact surfaces, are engaged by gear change levers mounted in the gear-box housing and/or gear change fingers arranged, for example, upon a selector shaft, or are secured to selector forks with selector rails, wherein all of the selector rails, of similar cross-section, are mounted directly and jointly in the gear-box housing at least at two locations and are adapted to pivot through 90° in order to co-operate with the selector fingers (91,92,93) arranged approximately vertically or horizontally; in that the common centre of rotation of the associated selector rails is arranged in such a manner that the same gear change levers (52,72,720) or select-or forks (49) are actuated by the associated selector rails (2,3,4); and in that the respective gear change levers (52,72, 720) and/or selector forks (49), associated with the channels, remain unchanged as regards position and shape.
2. A mechanical gear changing device as defined in claim 1, wherein the selector rails (2,3,4) are guided, for example, in a circular bearing bush (8) securable to the housing.
3. A mechanical gear changing device as defined in claims 1 or 2, wherein the angular position of the selector rails (2,3,4) is obtained by a torque lock (81) on at least one of the bearing bushes (8) or by a selector fork (4) secured to a selector rail (4).
4. A mechanical gear changing device as defined in claim 1, wherein a locking device is arranged in the vicinity of the selector rails (2,3,4) for the unselected speeds, the said locking device comprising a locking plate (6) arranged at right angles to the selector rails, secured axially in the gear-box housing (11) cooperating with recesses (24,34,44) in the selector rails, and brought by one of the selector rails into the locking position for the other selector rails.
5. A mechanical gear changing device as defined in claim 4, wherein the locking plate (6) is arranged between the gear-box housing (11) and the one bearing bush (8) in such a manner as to be movable.
6. A mechanical gear changing device as defined in claim 5, wherein the bearing bush (8) comprises, in the plane of the central selector rail (3) close to the periphery, a projecting guide pin (nub 84) in relation to which the locking plate (6) is axially movable and pivotable.
7. A mechanical gear changing device as defined in claims 4, 5 or 6, wherein the recesses (24,34,44) in the vicinity of the locking plate (6) are open towards the front faces of the selector rails (2,3,4) the recess (34) (central rail), in the vicinity of the lower edge of the locking plate (6), and the two other recesses (24,44) comprising notches (33,23,43) at the upper edges in which said locking plate engages alternately.
8. A mechanical gear changing device as defined in claims 4, 5 or 6, wherein the locking plate (6) comprises a slot (61) accommodating the guide pin, an opening (62) through which the ends (22,32,42) closest to the said guide pin, of the selector rails (2,3,4) project, and an arcuate recess (63), facing the said slot (61), for the other ends (22A,32A,42A) of the said selector rails (2,3,4) and in that the one end (32) is locked by the upper boundary of the opening (62), while the two ends (22A,42A) are locked by the lateral boundary of the arcuate recess (63), the said locking action being alternate, thus making it possible to engage a speed.
9. A mechanical gear changing device as defined in claims 4,5 or 6, wherein the pivoting motion of the locking plate (6) in the terminal positions - respectively with one speed engaged - is limited by the outer edges (25,45) of the selector rails (2,3,4).
10. A mechanical gear changing device as defined in claim 1, wherein guidance of the selector rails (2,3,4) in the gear-box housing (1) is effected by stud-like elements (101) on the selector rails (2,3,4) assembled into a unit (100), the outer selector rails (40,20) being provided with flats (102).
11. A mechanical gear changing device as defined in claim 5, but for gear change boxes consisting of a basic gear-box and a group transmission cooperating therewith and flanged thereto, wherein mounted rotatably at right angles to the selector rails (2,3,4) in the vicinity of the other bearing bush (80), for the mounting of the said selector rails of the basic gear-box in the gear-box housing (1), is a blocking plate (65) which is displaced, against the action of a spring (99), by a selector rail (95) arranged to select the group trans-mission (10), the said selector rails (2,3,4) being blocked until said group transmission has been selected.
12. A mechanical gear changing device as defined in claim 11, wherein the blocking plate (65) is mounted between the bearing bush (80) and the bottom (15) of a recess (16) in the gear-box housing (11) and upon a pin or nub (86) arranged near the edge of the said bearing bush, in that the blocking plate (65) is pivoted about said pin or nub, in that the pivot-ing motion is produced by a control cam having indentations, said control cam (96) arranged in the selector rail (95) of the group transmission (10) and cooperating with a control nose (68) on the said blocking plate, the said control nose, under the action of a spring (99) which is mounted and supported in the gear-box housing (11) (bore 17) is pressed by a lever (69) on the blocking plate in the direction of the selector rail (95) of the group transmission (10), and in that the suitably shaped blocking plate engages, in the blocking position, in notches (221,321,421) which are engaged in the forked ends (220,320,420) of the selector rails (2,3,4).
13. A mechanical gear changing device as defined in claim 12, wherein the pivotably mounted blocking plate (65) comprises, at the external contour adjacent the control nose (68) blocking noses (66) which engage, in the locked position, in all of the selector rails (2,3,4) or in those to be locked, and in that an opening is arranged through which some of the forked ends (220,320,420) of the selector rails project.
14. A mechanical gear changing device as defined in claim 13, wherein the opening (67) in the blocking plate (65), in conjunction with the notches (222) on the forked ends (220) of the selector rails (2), block the movement thereof.
15. A mechanical gear changing device as defined in claims 12, 13, or 14, wherein the control cam (96) of the selector rail (95) is arranged in such a manner that, in the positions in which the group transmission is shifted, the control nose (68) of the blocking plate (65) does not engage in indentations (97) in the control cam (96).
16. A mechanical gear changing device as defined in claim 12, wherein the control nose (68) bears directly upon the control cam only in the selected positions of the group transmission and in areas where a pivoting motion of the blocking plate (65) is effected, support for the blocking plate (65) during the remaining shifting procedure in the group transmission being provided by the bearing bush (80) of the selector rails for the basic gear-box or by the gear-box housing.
17. A mechanical gear changing device as defined in claims 12 or 13, wherein the selector rail (95) of the group transmission (10) is also a torque lock for the bearing bush (80), and in that the edge of the latter comprises two recesses (87) located at 90° to each other, for said selector rail, and nubs or pins (86) for mounting the blocking plate (65), and in that the mounting and support bore (17) for the spring (99) in the gear-box housing (11) remains unchanged even if the selector rails (2,3,4) for the basic gear-box (1) are rotated through 90°.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3243579 | 1982-11-25 | ||
| DEP3243579.7 | 1982-11-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1207561A true CA1207561A (en) | 1986-07-15 |
Family
ID=6178983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000441846A Expired CA1207561A (en) | 1982-11-25 | 1983-11-24 | Mechanical gear-changing device |
Country Status (5)
| Country | Link |
|---|---|
| BR (1) | BR8306457A (en) |
| CA (1) | CA1207561A (en) |
| FR (1) | FR2536706B1 (en) |
| GB (1) | GB2130664B (en) |
| ZA (1) | ZA838651B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4827793A (en) * | 1988-06-01 | 1989-05-09 | Dana Corporation | Forward/center control shifting apparatus for a vehicle transmission |
| DE502005004520D1 (en) * | 2004-02-03 | 2008-08-07 | Getrag Getriebe Zahnrad | CONTROL DEVICE |
| US11162579B2 (en) * | 2019-11-14 | 2021-11-02 | Hyundai Motor Company | Dial type shift control apparatus for electronic shift system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1385909A (en) * | 1971-05-14 | 1975-03-05 | Cav Ltd | Gear change mechanism |
| GB1570759A (en) * | 1975-10-23 | 1980-07-09 | Zahnradfabrik Friedrichshafen | Shift device for change-speed gearboxes in motor vehicles |
| DE2805044C3 (en) * | 1978-02-07 | 1981-11-26 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Mechanical switching device for a gearbox |
| US4273004A (en) * | 1978-07-25 | 1981-06-16 | Morrison William M | Gear selector mechanism |
| DE3000577C2 (en) * | 1980-01-09 | 1983-01-27 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Switching device for a gear change gearbox consisting of a main and a two-range group transmission |
-
1983
- 1983-11-21 ZA ZA838651A patent/ZA838651B/en unknown
- 1983-11-22 FR FR8318693A patent/FR2536706B1/en not_active Expired
- 1983-11-23 GB GB08331258A patent/GB2130664B/en not_active Expired
- 1983-11-24 BR BR8306457A patent/BR8306457A/en not_active IP Right Cessation
- 1983-11-24 CA CA000441846A patent/CA1207561A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2130664B (en) | 1986-10-22 |
| GB8331258D0 (en) | 1983-12-29 |
| FR2536706A1 (en) | 1984-06-01 |
| BR8306457A (en) | 1984-06-26 |
| FR2536706B1 (en) | 1987-01-09 |
| GB2130664A (en) | 1984-06-06 |
| ZA838651B (en) | 1984-06-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |