FR2725943A1 - CABLE-OPERATED GEAR CHANGE MECHANISM - Google Patents

Abstract

Cable-operated gear change mechanism for self-propelled vehicles, characterized in that the movable assembly is constituted by a preferably metallic ring (16) which receives the gear lever (6) and covers a fixed spherical head (14) around of which the aforementioned ring is articulated to actuate the engagement cable (4) and that of the gear change (5).

Description

Cable-operated gear change mechanism

  The invention relates to a change mechanism

  gear for self-propelled vehicles, and in particular, a mechanism in which the mobile assembly is constituted by a ring, preferably metallic, which is integral with the gear lever and covers a spherical head around which this ring can be articulated in order to activate the interlocking cables

and selection.

  The mechanisms of articulation of changes

  vehicle speeds, in general, are fairly well known.

  They include a spherical head combined with the gear lever which can be articulated inside a special housing on a support. In this version,

  it is the spherical head which is articulated in order to action-

  ner the gear lever and therefore the cable

gear engagement.

  In other conventional solutions,

  the spherical head is secured to a small metal stud

  lique which comprises, at its end, a sphere which cooperates with a branch of a reference which actuates the

gear change cable.

  In this version, the mobile assembly has

  as a starting point a metal axis of large diameter

  meter which must be machined in order to obtain the two aforementioned spheres. This results in a considerable loss of

  material as well as long and costly machining. By ail-

  their, it is necessary to realize a housing for the sphere

  which is also long and expensive.

  In another known embodiment, the gou-

  metal jon is welded or crimped, which generates a loss of resistance on the lever, the sphere being for example of injected plastic. Such an achievement poses many problems with regard to the orthogonality of the whole and the use of

  welds which can weaken the part.

  In yet another embodiment, a calibrated rod receives a spherical caster in polished steel which is crimped on both sides as well as a second smaller caster and also crimped. The construction of this model is extremely complex and only concerns certain types of gear changes. Such mechanical assemblies are difficult

to achieve.

  In yet another solution, it is

  provided a set of studs and pads ortho-

  gonals, welded or crimped together. In this case, the clock-

  thogonality of the parties almost always constitutes

  a difficult problem to solve.

  One of the aims of the present invention is to remedy the various drawbacks mentioned above. The mechanism according to the invention comprises a plate with an orthogonal rim and a part

  oblique anterior through which cables pass

  gears for engaging gears and changing gears, the first being connected to the gear lever by a pivot and the second to a branch of a gear, and is characterized in that, on the plate is fixed, by bolts , a support having an L-shape and receiving, via a set of nuts and locknuts, an orthogonal bar having a bulge affecting the shape of two truncated cones joined by their large base, this bulge being inserted into a spherical head which constitutes the main support responsible for the gear engagement movement, the spherical head being crimped into the

  resistant mass which is housed in a cylindrical ring

  integral with the gear lever, while a

  support is crimped on the cylindrical ring and is pro-

  bordered by a stud terminated by a spherical head which constitutes a secondary support for the gear change and is connected to the other branch of the gear

  which is pivotally mounted on an axis of the support.

  Such an accomplishment considerably simplifies

  the construction of the whole by reducing

  the labor and the material used.

  In addition, the manufacturing time of such an assembly is reduced, which allows the elimination of labor and reduces material losses during

  machining. Indeed, in the realizations agreed-

  tional, the axis which constitutes the mobile assembly must be machined from a cylindrical bar of large

  diameter in order to obtain the large and the small sphere.

  On the other hand, according to the invention, the small sphere is incorporated into the stud, which simplifies the manufacture

  and reduces costs and execution time.

  The invention also makes it possible to produce an assembly in which the gear lever actuates

  the interlocking cable below the plate.

  In this case, it suffices to extend the lever by a

  part extending through the plate which is necessary

  for certain types of gear changes

with reverse movements.

  The invention also makes it possible to provide a gear pre-selector in order to control the maximum engagement strokes and the neutral position, thereby eliminating the greater or lesser play which still exists in the gearboxes and gives the user a feeling of precision in its

maneuvers.

  In addition to these advantages, the invention

  puts to increase the safety of the mechanical assembly

  eliminating welds and orthogonal problems

1S bed.

  Finally, the invention makes it possible to reduce the

  vibrations and the different noises generated by them

  while reducing wear and tear on the various parts.

  The invention will now be described in more detail with reference to modes of

  particular achievements given by way of example only

  LEMENT and shown in the accompanying drawings, in the-

which:

  Figure 1 is a general perspective view

  gear change with the plate, the

  seems to be moving and the interlock cables

  its and shifting, the latter being

partially shown.

  Figure 2 is a sectional side view

  of the mobile assembly with the gear lever,

before line A-A in figure 1.

  Figure 3 is a side view of the assembly

  ble movable with the gear lever for a version in which the cable is actuated below

from the whole.

  The cable operated system, introduced in an articulated gear change mechanism

  for self-propelled vehicles, object of the invention, comprising

  takes a plate 1 serving to support the assembly with

  an orthogonal rim 2 and an oblique front part

  that 3 through which pass a snap-in cable

  gear 4 and a shift cable, the first extending to a shift lever 6 to which it is fixed by a pivot

  and the second being connected to an L 7 reference.

  On the plate 1 is fixed, by bolts 9, a support 8. The support 8 has the general shape of an L 10 and allows, by means of a set of nuts and locknuts 11, the fixing of an orthogonal metal bar 12. The bar 12 comprises, at an intermediate point of its length, a bulged part 13 affecting the shape of two contiguous truncated cones

by their large base.

  s The bulged part 13 is inserted into a spherical head 14 which constitutes a main support

  interlocking movements and which can be carried out

  made of different materials including some resistant plastics. The spherical head 14 is set in a resistant mass 15 which is mounted in a cylindrical ring 16 secured to the gear lever 6. A support 17 set on the cylindrical ring 16 supports a stud 18 terminated by a head 19 which constitutes a secondary support for the movements of the gear change. The head 19 is connected to a branch of the reference 7 which pivots on the axis

l9a of support 8.

  In the embodiment of Figure 2, there is provided a preselector and speed positioner 20. The latter consists of a part integral with the cylindrical ring 16 which, with the action of a helical spring of pressure 21, limit more or less the existing play when shifting to neutral, or at a set speed, and gives the user

  a feeling of precision in its maneuvers.

  This arrangement is possible because it is the cylindrical housing which is movable and

  not a spherical head as in the systems con-

  prospective. In the embodiment of FIG. 3, the gear lever 6 is extended on the side of

  plate 1, which is of interest in the cons-

  tructions in which the cable must be operated

  under the assembly, that is to say, in cases where the

  ble is operated in the opposite direction to that of the lever.

  The metal ring 16 is integral with the

  gear lever 6 which receives the interlock cable

  gears and which rotates around the spherical head

  risk to allow angular movements. This aspect constitutes one of the novelties of the invention because the construction of the assembly is simplified and

  this saves manpower and ma-

  third. In addition, during the movement of the metal ring 16, the stud 18 which is terminated by the

  head 19 will also be actuated and will generate

  metal arm 7 so that it activates the

gear change cable.

  Of course, the invention is not li-

  affected by the embodiments which have just been

  described and represented. We can bring many

  detail changes without going out

of the scope of the invention.

Claims (3)

R E V E N D I C A T I 0 N S   1. Gear change mechanism   actuated by cables for self-propelled vehicles   taking a plate (1) with an orthogonal rim (2) and an oblique front part (3) through which pass gear engagement (4) and gear change (5) cables, the first being connected to the lever gears (6) by a pivot and the second to a branch of a return (7), characterized in that on the plate (1) is fixed, by bolts   (9), a support (8) having an L-shape (10) and receiving   by means of a set of nuts and   nuts (11), an orthogonal bar (12) having a bulge (13) affecting the shape of two truncated cones joined by their large base, this bulge   being inserted into a spherical head (14) which constitutes   kills primary support responsible for the movement of   gear engagement, the spherical head (14) being crimped in a resistant mass (15) which is housed in a cylindrical ring (16) integral with the gear lever (6), while a support (17) is crimped on the cylindrical ring (16) and is extended by a   stud (10) terminated by a spherical head which   secondary support for the change of speed   ses and is connected to the other branch of the reference (7) which   is pivotally mounted on an axis (19a) of the support (8).   2. Gear change mechanism actuated by cables for self-propelled vehicles, according to claim 1, characterized in that the gear lever (6) is extended on the side of the plate (1) in an embodiment in which the cable is   operated in the opposite direction to that of the lever (6).   3. Gear change mechanism actuated by cables for self-propelled vehicles, according to claim 1, characterized in that it comprises a pre-selector and a gear positioner (20) comprising a part integral with the cylindrical ring (16) and which, under the pressure exerted by a helical spring (21), limits the play of the lever   (6) in the neutral or engaged position.