KR100497823B1 - Gear shift position detector - Google Patents

Abstract

The present invention relates to a transmission gear position sensor for indicating that the transmission gear is engaged in the transmission. The device comprises an instruction structure 19 connected to a portion 11 of the transmission ratio selector mechanism of the transmission moving in the first linear direction X and the second rotational direction Y during selection of each gear, and a cam ( 20 in the form of a cam face 28 and in the first and second directions to provide an indication of the currently coupled transmission ratio of the transmission via the linear sensing probe 26. It includes a sensing configuration to be moved to).

Description

Gear shift position detector

Referring to the present invention in more detail by the accompanying drawings as follows.

1 is an exploded perspective view showing a part of a shift gear position sensor and a shift gear selecting mechanism;

2 is a cross-sectional view taken along the line A-A of FIG.

3 is an explanatory view of a gear selection gate used by the selection mechanism shown in FIG.

4 is a front view showing the shape of a sensing cam used for the shift gear position sensor of FIG. 1 as viewed in the direction of arrow B;

5A to 5E are explanatory diagrams showing neutral conditions of a cam lift and a transmission mechanism at each transmission ratio.

Fig. 6 is a diagram showing the range of cam displacement for each speed ratio.

FIG. 7 is a sectional view showing a modified form of the sensor device shown in FIGS. 1 and 2. FIG.

8 and 9 are cross-sectional views showing another configuration in which the sensing cam is not directly supported from the sensor mounting housing.

The present invention relates to a shift gear position sensor for providing an indication as to which shift gear is currently coupled to a transmission of a motor vehicle.

Typically, a vehicle transmission has a plurality of transmission gears that can be mutually exclusively coupled to each other so that only one transmission gear can be engaged at any one time, and these transmission gears move in a linear and rotational direction so as to engage each transmission gear. It is selected by the selection member.

An object of the present invention is to provide a transmission gear position sensor that can be easily detected the operating ratio of such a transmission.

According to one aspect of the invention there is provided a transmission gear position sensing device for indicating that one of a plurality of transmission gears is engaged in a transmission, the device being arranged in a first linear direction and a second rotational direction during selection of each transmission gear. An instruction structure operatively connected to a portion of the transmission ratio selection mechanism of the moving transmission, and moving in a third linear direction in accordance with the movement of the instruction component in the first and second directions to provide an instruction regarding a current transmission ratio of the transmission; It consists of a sensing configuration in the form of a cam surface.

In a first embodiment the sensing arrangement is in the form of a cam and moves the linear sensing probe of the electrical position sensor to provide an indication of the combined transmission ratio.

The cam may simply be in contact with the probe or may be connected to the probe in a snap or other connection.

The cam extends through a through hole formed in the casing of the selection mechanism and can act in the third linear direction in a housing that supports the electrical position sensor.

The cam and the housing in which the cam acts linearly inside have a cooperative configuration for preventing the cam from rotating in the housing.

The housing includes a mounting flange fixed outside the casing of the selection mechanism.

The cam and the housing may be made of plastic material.

In another embodiment, the electrical position sensor has a portion extending toward the housing and protruding therefrom from the sensing probe, the cam in the third direction on an outer side of the portion of the electrical position sensor projecting into the casing. It has a hollow tubular portion that is stretchable and linearly active.

The portion of the electrical position sensor and the flexible tubular portion have a mating arrangement to prevent relative rotation. Again, these stretchable components can also be made of plastics.

1 and 2 show a part of the speed ratio selection mechanism 10 of a vehicle transmission (not shown). The selection mechanism includes a shaft 11 on which a speed ratio selection rod 12 is mounted, which is coupled to cutouts 13, 14, 15 formed in the speed ratio selection rods 16, 17, 18. As is well known, the shaft 11 selectively engages with each speed ratio selection rod 16, 17, 18 during the movement of the gear shift lever (not shown) in the speed ratio selection gate shown in FIG. It is possible to move in the first direction X in the axial direction and to rotate in the direction Y. The connection method (not shown) between the transmission gear select lever and the shaft 11 may be a mechanical, electrical, or hydraulic connection method. For example, the gear lever may be connected to the shaft 11 via a cable and a lever system.

The shaft 11 is provided with a pointing structure in the form of a projection 19, which projection is activated in a plastic housing 21 which protrudes through a through hole 22a into a casing 22 surrounding the selection mechanism. Coupled to the sensing arrangement in the form of 20). The housing 21 also includes a mounting flange 23 extending out of the casing 22 and having an electrical position sensor 24 fastened with a screw 25. The detector 24 is in contact with the back portion 27 of the cam 20 and probes 26 along the linear movement of the cam 20 in the direction Z in response to the linear and rotational movements of the axis 11 in the respective directions X and Y. Has The detector 24 generates an electrical signal that changes with the axial position of the probe 26 to provide an indication to the electrical control system that the transmission gear is currently coupled to the transmission. And this electrical signal is for example part of a semi-automatic transmission of the type described in EP 0038113, 0043660, 0059035 and 001220 or as part of a fully automatic transmission described in UK 95 02140.8. Can be used.

In Fig. 4, this shows in detail the shape of the cam surface 28, which is the front portion of the cam 20, which is contacted by the projection 19. This cam surface 28 has a center track 30 and is capable of moving the projection 19 along this track when the transmission is in a neutral state. An upward cam contact surface 31 is formed, which is engaged by the projection 19 when the shaft 11 is moved to one side from one side end of the track 30 to engage the reverse gear of the transmission. The other side of the neutral track 30 is formed with a downward cam contact surface 32 is engaged when the shaft 11 is moved to engage the five-gear gear of the transmission. On both sides of the neutral track 30, the cam contact area is moved axially toward the center of the track and is coupled by the projection 19 when the shaft 11 is moved to engage the third and fourth gears of the transmission. 33) 34 are formed. These contact areas 33 and 34 are formed at a position slightly lower than the height of the neutral track 3 of the cam surface 28.

On the other end of the neutral track 30, two upward contact areas 35 and 36 are formed on both sides of the neutral track, which are formed when the first and second gears of the transmission are coupled by the movement of the shaft 11. It is coupled by the protrusion 19.

5A shows the normal displacement of the back portion 27 of the cam 20 from the longitudinal axis X-X of the axis 11 when the probe 19 is engaged with the neutral track 30.

Typically this displacement is 37 mm (0.3 mm). Similarly, FIGS. 5B, 5C, 5D and 5E show the normal displacement of the rear portion 27 when the 1st / 2nd stage, 3rd / 4th stage, 5th stage and the reverse gear are selected by the transmission. 6 shows a chart showing normal, maximum and minimum displacements for each speed ratio. This diagram defines the electrical signal from the sensor 24 for the range of cam positions and for each transmission ratio.

As can be appreciated from the above, the output signal from the detector 24 will be the same when the projection 19 is coupled to the cam contact surface 35 or 36 to select the first or second operating ratio. . Likewise, the output from the detector 24 will be equal to the third and fourth operating ratios when the protrusions 19 engage the cam contact surface 33 or 34 to select the third or fourth operating ratios. will be. In order to allow the electric control system to differentiate between the first, second and third and fourth transmission ratios, the gear selector lever indicates whether the driver pulled or pushed the gear lever and the entire system first and second gears. A motion sensor is provided to differentiate between the selection and the third and fourth gear selections.

In addition, when the moving distance of the probe 26 is sufficiently long, the cam face 28 suitably modified may have the inherent axial position of the probe 26 (corresponding to the inherent position of the cam 20) for each speed ratio. There is no need to use a gear lever push / pull detector to differential between the first and second and third and fourth gears as mentioned above.

FIG. 7 shows a sensing arrangement similar to that shown in FIG. 1 except that the detector 24 has a spline portion 24a inserted into the plastic housing 23 by casting or permanent press molding.

In all of the above configurations, the probe 26 of the detector 24 is simply in contact with the rear portion 27 of the cam 20 and remains in contact with this surface when the cam moves in the Z direction. In the configuration shown in Fig. 8, the probe 26 has a ball-shaped end 26a that snaps to the ball-shaped request 26c of the cam 20 so that the cam and the probe 26 can move as a single piece. In the configuration shown in FIGS. 8 and 9, the cam 20 is guided on the protrusion 24b of the detector 24 and is not directly supported from the housing 23 which mounts the detector 24 in the selection mechanism casing. It has (20a). As shown in Fig. 9, the cross section of the protrusion 24b of the detector 24 and the tubular portion 20a of the cam 20 surrounding it shows the cam (when the protrusion 19 moves while selecting different transmission ratios of the transmission). 20 cooperates to prevent rotation about the projection 24b.

As such, the present invention provides a simple and efficient configuration for attaching an electrical position sensor to the selection mechanism casing and converting the linear and rotational motion of the speed ratio selection member into a pure linear motion of the sensing probe of the position sensor.

Claims (16)

In order to indicate the gear ratio currently connected among the plurality of transmission ratios in the transmission, it has a projection 19 connected with the shaft 11 of the transmission ratio selecting mechanism 10 constituting the transmission, and the shaft ( 11) moves in the first direction x of the linear motion and in the second direction y of the rotational motion, In the gear position sensor having a cam 20 having a cam contact surface, the projection 19 is moved in the first direction (x) and the second direction (y), the cam 20 is moved, A shift gear position sensor, characterized in that the cam (20) sliding linearly by the protrusion moves in the third direction (z). The shift gear position sensor according to claim 1, wherein the cam (20) moves the linear probe (26) of the sensor (24) to indicate the connected gear ratio. The shift gear position sensor according to claim 2, wherein the cam (20) is in contact with or connected to the sensing probe. 4. The shift gear position sensor according to claim 3, wherein the cam (20) is snap-connected to the sensing probe. The housing (21) according to claim 1, wherein the cam is arranged inside the housing (21), the housing (21) extends through the through hole (22a) formed in the casing (22) of the speed ratio selector (10), and the housing (21). Transmission gear position sensor, characterized in that the support (24). 6. The shift gear position sensor according to claim 5, wherein a component for preventing rotation of the cam (20) in the housing (21) is constituted by the cam (20) and the housing (21). The shift gear position sensor according to claim 5, wherein the mounting flange (23) is fixed to an outer portion of the casing of the shift ratio selection mechanism (10). 6. The shift gear position sensor according to claim 5, wherein the cam (20) and the housing (21) are made of a plastic material. 8. The shift gear position sensor according to claim 7, wherein the detector (24) is cast, press-formed or screwed to the mounting flange. 4. The sensor according to claim 2 or 3, wherein the detector 24 has a protrusion 24b extending into the housing 21 and having a probe 26 protruding therefrom. Transmission gear position sensor, characterized in that the cam (20) is formed of a tubular portion (20a) of the hollow structure that is linearly slidable in a third direction (z). 12. The shift gear position sensor according to claim 10, wherein the protruding portion (24b) of the detector (24) and the flexible tubular portion (20a) have a coupling structure for preventing relative rotation. 12. The shift gear position sensor according to claim 11, wherein the telescopic tubular portion (20a) and the protruding portion (24b) are made of a plastic material. 12. The shift gear position sensor according to claim 10, wherein the detector (24) is cast, press-formed or screwed into a mounting flange fixed to an outer portion of a casing of the speed ratio selector (10). The central neutral track 30 to which the projections 19 are engaged when the speed ratio selector 10 is in neutral, and the projections 19 at each transmission ratio are respectively coupled. Transmission gear position sensor, characterized in that the contact surfaces located on both sides of the neutral track is configured in the cam (20). 10. Transmission gear position sensor according to any one of the preceding claims, characterized in that the cam (20) generates a natural motion for each transmission. 10. The cam 20 according to any one of claims 1 to 9, wherein the speed ratio is selected by moving the speed ratio selection rod 12 in a gear ratio selection gate having a plurality of selection planes, and when the speed ratio is selected on the same selection plane, the cam 20 is selected. The movement of the shift gear position sensor, characterized in that the gear ratios are divided in the same selection plane by using a motion sensor for sensing the movement direction of the gear ratio selection rod 12.