SE538515C2 - Compact Gearshift system for the cable change of a vehicle - Google Patents

Abstract

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Description

Title Compact gear lever system for wire shifting of a vehicle Field of the invention The present invention relates to a gear lever system according to the preamble of the independent patent claim. In particular, the invention relates to a gear lever system adapted to transmit gear movements from the gear lever via two gear wires to the gearbox.

Background of the invention Many vehicles, for example trucks, with manual shifting today have a system with rods and links. A disadvantage of these systems is that the linkage system under the vehicle is relatively space consuming.

DE-19803607 shows an example of a shifting device where the shifting movements are transmitted to the gearbox via a link system.

By allowing wires to influence the shift instead of a linkage system under the vehicle, a single solution that is less space-consuming can be achieved. A gearbox where the gears are guided by wires comprises two shift wires which, by being moved to predetermined longitudinal positions, often by means of a shift servo, influence which gear is to be used.

The object of the present invention is to provide a manual shifting system with cables instead of the linkage system which partly meets the requirements for accuracy in shifting which the driver of the vehicle requires and partly is technically and thus economically advantageous.

Summary of the Invention The above objects are achieved by the invention defined by the independent claim.

Preferred embodiments are defined by the dependent claims.

To maintain a good shifting feel for the vehicle driver, the shift lever should not be extended. The movement from the neutral position to the engaged gear shall be in the order of 60-80 mm and the distance laterally between different gear positions in the order of 30-40 mm.

Due to the requirement to provide a good feeling of shifting, it is therefore, in particular larger vehicles, necessary to place the center of rotation of the shift lever above the mounting surface in the cab floor. Such a placement would mean that the attachment of the deflection frame to the gear lever would have to be upp surface from the cab floor, ie. the wires would have to go into the cab, which should be avoided for production reasons, among other things.

In order to be able to surface the rotation point of the lever and to avoid having to mount the wire frames inside the cab, a shifting system according to the present invention has been provided.

The gear lever system according to the present invention allows the movement of the lever to transmit the wire frames in the desired manner, and ensures, among other things, that the correct direction of pull and pressure is applied to the wire frames.

The advantage of the solution is that a shorter gear lever can be used, even though the wires are mounted under the cab floor and do not need to be led into the cab.

The gear lever system also allows it to be possible to adapt the construction to the pull and pressure directions of the wires, for example if the gear servo should require it.

A solution for the gear lever mechanism is constructed with a link system that has been adapted to the requirements of the prevailing space. The linkage system thus allows the movement of the lever lever to be transmitted to the wire frames in the desired manner. The solution also ensures that the correct pulling and pressure direction in the wires is achieved.

By constructing the transmission links according to the present invention, the volume of the can change mechanism is kept as small as possible. It also allows the wires to be mounted under the cab floor.

Brief Description of the Drawings Figure 1 shows a perspective view of a shift lever system according to the present invention. Figure 2 schematically shows an example of a shift diagram.

Figure 3 shows a schematic view of the first transmission link according to an embodiment of the present invention.

Figure 4 shows a further perspective view of a gear lever system according to the present invention.

Figure 5 is a further perspective view of a gear lever system according to the present invention.

Figure 6 shows a schematic horizontal cross-section of the gear lever system at the level of the spherical bearing according to the present invention.

Figure 7 shows a schematic horizontal cross-section of the gear lever system in level with the horizontal strut according to the present invention.

Detailed Description of Preferred Embodiments of the Invention The present invention will now be described in detail with reference to the figures. In the figures, the same reference numerals have been used throughout to denote the same or an equivalent detail.

The invention thus relates to a gear lever system (see in particular Figures 1, 4 and 5) forward gear change of a vehicle, preferably a truck, adapted to transmit gear movements from the gear lever 2 to two gear wires 4, 6, the gear wires running substantially horizontally from a position below the vehicle in the vehicle's gearbox. In the figures, the shift wires are arranged to run in protective bellows.

The gear lever system comprises a gear lever 2, a spherical bearing 8 with a pivot point Crunt which said Gear lever is movable, a first transmission link 10 and a second transmission link 12 adapted to be actuated depending on gear movements as applied to the gear lever 2. The first and second transmission links 10, 12 are arranged in connection to the lower end of the gear lever. The gear lever system according to the invention allows the gear lever to be movable to the right and left, seen from the driver, along a first gear movement A which is indicated by a bi-directional arrow A in the figures.

The shifting movement A refers to movement in the neutral position of the gearbox and can also be specified as perpendicular to the longitudinal direction of the vehicle.

The gear lever system further allows the gear lever to move forwards and backwards, seen from the driver, along a second gear movement B denoted by a bidirectional arrow B in the figures.

The shifting motion B refers to movement from the neutral position of the gearbox to the desired shifting position and takes place in parallel with the longitudinal direction of the vehicle.

Figure 2 shows an example of a shift pattern where R denotes reverse gear, C creeps gear and 1, 2 and 3 forward gears.

According to the invention, the first transmission link 10 is adapted to directly transmit single-gear movement A, which is thus substantially perpendicular to the longitudinal direction of the vehicle, to the first shift wire 4, and that the second transmission link 12 is adapted to transmit a shift movement B, which is substantially parallel to the longitudinal direction of the vehicle, to the second shift wire 6.

The first transfer link 10 is fixed in a bearing 16 such that the first transfer link 10 is movable about a horizontal lateral axis 18, and that the lateral axis longitudinal axis A1 is a predetermined distance from the spherical bearing rotation point C. The first transfer link 10 is adapted to be actuated via transmission shaft 20 having a longitudinal axis A2 passing through the point of rotation C of the spherical bearing one end of the transmission shaft is fixed in the lower part of the gear lever and thus moves when the gear lever moves and acts via the other end the first transmission link via a sliding bearing 22. The sliding bearing 22 allows the transmission shaft from the shift lever can be angled, rotated, and slid substantially perpendicular to the first transmission link. The first transfer link 10 further comprises a lower part 24 with an attachment point 26 with a bearing 28 for the first shift wire 4, where the attachment point is located a predetermined vertical distance h below the bearing 16 for the side impact shaft 18.

Figure 3 shows a schematic view of the first transmission link according to an embodiment of the present invention.

In the embodiment illustrated in Figures 1, 4 and 5 and also schematically shown in Figure 3, the first transfer link 10 is adapted to rotate about the side pivot shaft 18 by the bearing 16 by actuating the gear lever via the transfer shaft 20 via the plain bearing 22 where the bearing 22 is located in front, seen in the vehicle longitudinal direction, the bearing 16. Thereby a movement of gear cable em 4 is achieved which means that when the gear lever co-gear movement A is moved to the right the gear cable 4 will be inserted into the gearbox and when the gear lever is moved to the left the gear cable 4 will be pulled out of the gearbox.

According to another embodiment, opposite movements of the gear wire can be obtained if instead the bearing 16 around which the transmission link rotates is instead placed in the position where the sliding bearing 22 is placed according to the embodiment described above and the sliding bearing 22 is placed at the location of the bearing 16.

The second transfer link 12 comprises a substantially horizontally oriented strut 30 and a first elongate link arm 38, the horizontally oriented strut 30 being hinged at its lower end 32 to the lower part of the gear lever and at its second end 34 being articulated to a first end 36 of the first elongate link arm 38 fixed in one opposite end 40 to the upper part of said vertical axis 14. The first link arm 38 is oriented so that its greatest extent is in a direction which is substantially perpendicular to the shifting movement B.

The bearing connecting the strut 30 to the first link jug 38 is a spherical bearing 42 which allows the horizontal strut 30 to be subjected to some rotation along its longitudinal axis A4 (see Figure 7) relative to the point of rotation of the bearing.

The vertical shaft 14 is in its lower part fixedly connected to a second elongate link arm 44 which in turn is attached to the second horizontally arranged gear wire 6, and that the second link arm 44 has an orientation which substantially corresponds to the orientation of the first link arm. 38.

The vertical axis 14 has a predetermined length 1 which is of the same order of magnitude as the predetermined distance h of the first transmission link 10.

The gear lever system further comprises a mounting plate 5 on which the gear lever and the transfer links are mounted. The mounting plate is adapted to be attached to the floor of the vehicle's cab, for example via screw connections. The plate is provided, among other things, with an elongate opening 7 adapted so that the lower part of the first transmission link can pass through the mounting plate for co-operation with the first shift wire.

The mounting plate further comprises a vertical hole adapted for the vertical bar.

A shifting operation consists of two phases, first the first shifting movement A, i.e. the driver of the shifting lever to the desired position along the line A, is performed. This movement causes a rotational movement around the rotation point C, and around the longitudinal axis A3 shown in Figure 6, the first transmission link is forced, by actuation of the transmission shaft, to rotate about the shaft A1 in such a way that, according to the embodiment shown in the figure, a movement to the right of the gear lever causes the front link of the transmission link to move upwards and this causes the lower part of the transmission link in one direction into the gearbox.

A movement to the left of the gear lever causes the first transmission link to be forced, by actuating the transmission shaft, to rotate about the shaft A1 in such a way that it causes the front part of the transmission link to move downwards and this causes the lower part of the first transmission link to actuate the first shift wire. a direction out of the gearbox.

The second transfer link 12 will be substantially stationary when the gear lever is moved in the neutral position, i.e. according to shift movement A.

The second phase of the shift maneuver means that the driver moves the shift lever to the desired shift position up or down from the neutral position, ie. shifting movement B. This movement also takes place through a rotational movement around the point of rotation C where the sliding bearing contributes to the first transmission link remaining in its position.

The second transmission link 12 is thus adapted to transmit movements performed longitudinally by the gear lever. The second transfer link thus comprises a substantially horizontally oriented strut 30 which at its one end is articulated attached to the lower part of the gear lever. The horizontally oriented strut is preferably articulated attached to the lower part of the gear lever via a bearing so that it is movable in a vertical plane. At its other end, the horizontally oriented strut is articulated connected to a first portion of a first elongate link arm 38 which in its opposite second portion is fixedly mounted to the upper portion of a vertical shaft 14. The bearing connecting the strut to the first link arm is preferably a spherical bearing. 42 which allows the horizontal strut to be subjected to some rotation along its longitudinal axis A4 relative to the point of rotation of the bearing.

The second part of the first link arm is thus fixedly mounted to the vertical shaft, for example via a screw connection.

The first link arm is oriented so that its largest extent is in a direction which is substantially perpendicular to the shifting movement B.

Thanks to the spherical bearing, the first link arm will be substantially still when the gear lever is moved in the neutral position, ie. in the shifting movement A.

The vertical shaft is in its lower part fixedly connected to a second elongate link arm 44 which in turn is attached to the second horizontally arranged gear cable 6.

The second link arm has an orientation that substantially corresponds to the first link arm.

Thus, longitudinal movements of the shift lever (shift movement B) are transmitted via the horizontally oriented strut to the first link arm which in turn affects the vertical axis which is rotated along the vertical axis. The movement of the vertical shaft affects the second link arm which transmits the movement to the second gear wire. The vertical axis has a length 1 which is of the same order of magnitude as the height h of the first transmission link.

The embodiment shown in the figures entails a rearward movement of the gear lever, e.g. attachment of gear 3 (see figure 2) that the first link arm is moved backwards which causes the vertical axis to be rotated and the movement is transmitted to the second link arm which acts on the other gear wire in a direction out of the gearbox. Correspondingly, a forward movement of the gear lever, e.g. when loading gear 2 (see figure 2) that the second link arm acts on the second gear wire in one direction into the gearbox. In this embodiment, the first and second link arms have the same orientation. If they are instead directed in opposite directions, reverse directions for how the gear lever is affected can be achieved.

Typical stroke lengths of the shift wires are +/- 25 mm. Other stroke lengths are of course possible to achieve by changing, for example, the height h of the first transmission link, or by changing the length of the first or second link arm.

The present invention is not limited to the preferred embodiments described above. Various alternatives, modifications and equivalents may be used. Therefore, the above embodiments are not to be construed as limiting the scope of the invention as defined by the appended claims.

Claims (7)

A gear lever system for shifting a vehicle, preferably a truck, adapted to transmit shifting movements from the shift lever (2) to a first and a second shift wire (4, 6), the shift wires running substantially horizontally from a position below the vehicle cab and into the vehicle gearbox , the gear lever system comprising the gear lever (2), a spherical bearing (8) with a point of rotation C around which said gear lever is movable, a first transfer link (10) and a second transfer link (12) adapted to be actuated depending on gear movements applied to the gear lever (2). ), said first and second transmission links (10, 12) are arranged in connection with the lower end of the gear lever, said first transmission link (10) being adapted to directly transmit single-gear movement A, which is substantially perpendicular to the longitudinal direction of the vehicle, to said first shift wire (4), and said second transmission link (12) is adapted to viarotate a vertical shaft (14) to transmit a n shifting movement B, which is substantially parallel to the longitudinal direction of the vehicle, to said second shifting wire (6), characterized by the first transmission link (10) is fixed in a bearing (16) such that the first transmission link (10) is movable about a horizontal lateral axis (18) ), and that the longitudinal axis A1 of the side impact shaft is a predetermined distance from the point of rotation C of the spherical bearing (8), the first transmission link (10) being adapted to be actuated by the gear lever via a transfer shaft (20) having a longitudinal axis A2 passing through the spherical bearing rotation point C. A gear lever system according to claim 1, wherein the transmission shaft (20) is adapted to actuate the first transmission link (10) via a plain bearing (22), the plain bearing allowing the transmission shaft from the gear lever to be angled, rotated, and slid substantially perpendicular to the first transmission link. A gear lever system according to claim 1 or 2, wherein the first transfer link (10) further comprises a lower part (24) with a fastening point (26) with a bearing (28) for the first shift wire (4), the fastening point being located a predetermined vertical distance h below the bearing (16) for the side impact shaft (18). lO Gear lever system according to any one of the preceding claims, wherein the second transmission link (12) comprises a substantially horizontally oriented strut (30) which is hinged at its lower end (32) to the lower part of the gear lever and at its other end (34) is articulated to a first end (36) of a first elongate link arm (38) fixed in a opposed second end (40) to the upper part of said vertical axis (14), the first link arm (38) being oriented so that its greatest extent is in a direction which is substantially perpendicular to the shifting motion B. A gear lever system according to claim 4, wherein the bearing connecting the strut (30) with the first link arm (38) is a spherical bearing (42) which allows the horizontal strut (30) to be subjected to some rotation along its longitudinal axis relative to the point of rotation of the bearing. Gear lever system according to claim 4 or 5, wherein the vertical shaft (14) is in the lower part fixedly connected to a second elongate link arm (44) which in turn is attached to the second horizontally arranged gear cable (6), the second link jug (44) has a single orientation that substantially corresponds to the orientation of the first link arm (ss). A gear lever system according to claim 3, wherein the vertical shaft (14) has a predetermined length 1 which is of the same order of magnitude as the predetermined distance h of the first transmission link (10).