GB2259337A

GB2259337A - Transmission selector system for radially coupled gears comprises tube having linear gear

Info

Publication number: GB2259337A
Application number: GB9118982A
Authority: GB
Inventors: Andrew David Marsh
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-09-05
Filing date: 1991-09-05
Publication date: 1993-03-10
Also published as: GB9118982D0

Abstract

Gears (1 to 7) of a cluster (A) are selectively connected to drive an output shaft (D) at varying speeds by means of a selector coupling (Z), splined on the output shaft and to any one gear of the cluster. The selector coupling is moved axially to engage with a given gear of the cluster by virtue of being mounted on a sliding tube (G) having a linear gear engageable by a gear wheel (K). <IMAGE>

Description

IMPROVEMENTS TO TRANSMISSION SELECTOR SYSTEMS.

This invention relates to a transmission selector system.

The seiection method of a multi-spead transmission system involves several moving jpartes Usually each speed being ammompaniad by its dwn individual selection device with a function to engage and disongage a gear by a variaty of means as and when required. Such systems can have limitations especially whan size and weight are considerations, also speed of selection and mdtiple speed requirements from a single range.

The principal object of this invention is the use of a single assembly to angage, disengage and coupla tha selection of speads the transmisaion has to offer and in this way take advantage of a siapler construction and lower production coat.

According to the present invention there is provided a transmission solector syoten comprising a pair of intermechlng gear ciusters, une mathined form molid the other ande up of segareis geefs. En catput chef that passes within these geers and a celechor davice with seans to couple these geare intornally to the seid output chaft to effect a aulti-speed trensmission system.

A specifice embodiment of the invention will be destribad by example with referenme to the ammompanying drmsings in which : Sigure One represents a plan view of a transmiesion assambly mith selector coupling in neutral position.

Figure Two represents a plan view of a transmission assombly with selcter coupling in engaged position.

Referring to figure one the assembly comprises two intermeshing gear clustere A and B. B is of solid construction and forms an input shaft mith bearings M and N at each end. An imput device de located at position P. A is the output cluster and is mede up of separate gears sach with a protruding journal that inter lochs and terd en the neighbouring gear. These gearsn have a common laternal spline with a neutral space between them to facilitata easy @@icction when the chafts are in motion also to provant mon- then ane speed being engsged at ont time.

The gears at each end of this cluster are borne independently and there is an intermediate bearing at position T. A splined shaft D is situated in the centre of cluster A with an output at point V and borne at the other end internally at S in an exension pieme R that is secured to the outer housing.

A selector coupling Z splined both internally to the output shaft D and externally to the centre of each of the gears 1-6 is attached via a thrust race to a sliding tube G. This tube has gear teath cut along one side of its langth and is a sliding fit on extension piece R. Gear wheel K is engaged with the teeth of the tube and can be rotated in stages in either direction. A detent devine is sited at position H.

Power is imtroduced to the transmission at point X and the solid gear cluster B rotates between bearings M and N. The gears of cluster A are in comstant mesh with the gears of cluster B and are rotated at speede respective to their individual ratios. The selestion is made when gear wheel K is caused to rotate in one direction or other. This gear whael is in mesh with linear gear 3 and will alide the tube/coupling Z in or out in stages to take up Brive with the required speed.

In figure one the selection coupling Z is in neutral positral position as it is not angaged with any of the gears 1-8.

In figure two the selection coupling Z is moved to engaqe mith inner spline of gear 4 , thus the power is transmitted from B through gear 4, through the selector compling and en to the output shaft at Y.

The speed of qutput Y (given a constant speed at x) will vary according to which of the gears in cluster A has been selected.

Claims

1 A transmission selector system for a multispeed gearbox comprising two intermeshing gear clusters, a selector coupling splined both internally to an output shait and enternally to the geare of one cluster, and a tube with a linear gear cut along one side of its length which is a sliding fit on an ewtension piece.

2 A transmission sulecter system as claimed in claim 1 wheroby the gears of the output cluster are profiled in such a way as to have a protruding fournal thet interlocks and bears on the neighbauring gear.

3 A tranmmission selector system s claimed in claim 1 and claim 2 whereb, the quars of the cutput mluster are supported by thron baering rates, one et each end of the cluater and one in the centre.

4 A tr ansmineion melacter systemas claimd im claim 1 wharety the qeurs of the input gaer cluater are fixed and will rotabe at a common speof.

5 A transminnien selemter system as claimed in claim 4 whereby tha imput gear cluster has a bearing at mach end.

6 A transmission salmotor system as claimed in claim i wheraty a selactor couplirg is splined internally to an output thaft und will freely alide along its length.

7 A transmittion selecor system as claimed in clain 6 thereby a selester moupling is aplined externally to the centre of @@@ of the goors of the output clumter and will alide internall, along the longth of this lcusten.

8 A transmission selector system as claimed in claim 1 whereeby a @rush race is lossted between the selector soupling nd the sliding tobe and that these three components move linearly together as the different selections are made.

9 A transmission selactor system as claimed in claim 1 whereby mne end of the cutput shaft forms a spigot for the location of a bearing within one end of the mxtension piane.

10 A transmicsion moloctor system as claimed in @@@@ @@@@ally as desoribed herein with reference to and @@ @@@@ @@@ figuren one @@@ twe of tia@ accompanying drawings.