JPH0520915Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a gear position detection device for a transmission.
In particular, by using multiple magnetoelectric effect elements,
It is effective for use in electronically controlled gear transmissions that are configured to automatically move a desired gear specified by a computer under the control of an actuator. related to technology.

[Conventional technology]

Gear transmissions installed in automobiles include a computer that calculates the appropriate gear ratio corresponding to the driving conditions, specifies the desired gear, and operates the gear shift, and a select rod that operates the select rod in response to the computer's commands to select the desired gear. There are electronically controlled gear transmissions that include a selection actuator and an actuator that similarly operates a shift rod to shift the selected gear from a neutral position to a desired position. In this transmission, in order to realize automatic control,
A device is installed to detect the position of the gear.

As shown in FIG. 5, such a gear position detection device includes a neutral position magnet 3a' and a both shift position magnet 3b', which are respectively disposed on the shift rod 2, and a transmission frame. Neutral position holes arranged in 1
It is equipped with an IC (integrated circuit device having a Hall element) 4a' and Hall ICs 4b' and 4c' for both shift positions, and each magnet 3a' and 3b' is By timely detection,
Some are configured to detect whether the gear is in neutral or both gears.

[Problem that the invention attempts to solve]

In such a gear position detection device for a transmission, two types of magnets are installed, one for the neutral position and the other for the shift position, to change the detection range, thereby eliminating the difference in mechanical tolerance range between the neutral state and the shifted state. However, there is a problem in that costs increase due to an increase in the number of parts and assembly work.

An object of the present invention is to provide a gear position detection device for a transmission that can reduce costs.

[Means for solving problems]

The gear position detection device for a transmission according to the present invention includes:
A small piece made of a magnetic material is attached to each of the magnetoelectric effect elements that detect the magnet, and the small piece attached to the magnetoelectric effect element at the neutral position has a size similar to that of the small pieces attached to the magnetoelectric effect elements on both sides thereof. It is characterized by being different.

[Effect]

The magnetic field formed by the magnet is varied by the magnetic material, and the variation depends on the size of the magnetic material.
Therefore, according to the above-mentioned means, since the size of the magnetic body disposed at the intermediate position is different from that disposed at both side positions, the sensitivity of the magnetoelectric effect element at the intermediate position to the magnet is This is different from that in the positional magnetoelectric effect element.
In other words, even if there is a single magnet, the detection ranges of the magneto-effect element at the middle position and the magneto-effect elements at both sides can be made different, and this difference causes the difference between the neutral state and the shifted state. Differences in mechanical tolerance ranges can be accommodated and the number of magnets can be reduced.

〔Example〕

FIG. 1 is a partial perspective view showing a gear position detection device for an electronically controlled gear transmission which is an embodiment of the present invention;
FIG. 2, FIG. 3, and FIG. 4 are schematic diagrams for explaining the operation.

In this embodiment, the gear position detection device of the transmission is configured to detect the gear position in an electronically controlled gear transmission, and includes a shift rod as an operating member and a gear position as a fixed member facing the shift rod. It is equipped to detect the gear position between the frame and the frame. That is, a shift rod 2 is disposed in the machine frame 1 of this transmission so as to cross the inside thereof, and is slidable in the longitudinal direction (hereinafter referred to as the left and right direction), but is prevented from rotating in the circumferential direction. The rod 2 is supported so as not to rotate by a key (not shown), and a single magnet 3 is disposed at the left end of the rod 2 and is fixed to the rod 2 so as to move therewith. On the other hand, at a position directly above the shift rod 2 in the machine frame 1, there are three integrated circuit devices (Hall ICs) each having a Hall element as a magnetoelectric effect element. The center Hall IC (hereinafter referred to as "Hall IC for neutral position") 4a is placed in a position where the magnet 3 is almost directly below when in neutral position, as will be described later, and the left and right Hall ICs (hereinafter referred to as "Hole IC for neutral position") are arranged and fixed respectively. (Referred to as the Hall IC for the left shift position and the Hall IC for the right shift position.)
4b and 4c are disposed at the left side and right side positions, respectively, where the magnet 3 is located substantially directly below when shifting to the left and right sides, respectively. These Hall IC4
a, 4b, and 4c are connected to input the detection results to a computer to be described later.

In each Hall IC, a small piece of iron made of a magnetic material is disposed so as to face a Hall element (not shown) as a magnetoelectric effect element, and is formed into a substantially cylindrical shape to be fixed. The size (outer diameter or length) of the iron piece 5a attached to the hole IC4a for the neutral position is
is set larger than that of the left shift position Hall IC 4b and the right shift position Hall IC 4c.

On the other hand, there are multiple shafts 6 at the bottom of the machine frame 1.
are arranged in the left-right direction so as to be parallel to the shift rod 2, and are also arranged in the front-rear direction and supported so as to be slidable in the longitudinal direction. and a gear meshing member (not shown) are each fixed. A select rod 9 is disposed at an intermediate position between the shift rod 2 and the shaft 6 in the front-rear direction perpendicular thereto and is supported so as to be slidable in the longitudinal direction. It is arranged and fixed like this. A lever 11 is attached to the shift rod 2 so as to be rotatable and integrally slidable.The lever 11 has its middle portion slidably inserted into a guide 10, and its lower end inserted into an engaging member 8. It is configured to be able to engage with each of the.

Shift rod 2 and select rod 9 are linked with shift and select actuators 12 and 13, respectively, which are composed of fluid pressure cylinder devices, etc., and these actuators operate solenoid valves (not shown) under the control of a computer 14, respectively. It is configured to operate the rods 2 and 9. The computer 14 is configured to control the actuator according to operating conditions, and the computer 14 includes the hall
IC4a, 4b, 41c are connected.

Next, the effect will be explained.

The computer 14 determines an appropriate gear ratio based on operating conditions such as traveling speed and engine torque, and controls the actuators 12 and 13 by specifying the corresponding gear. By sliding the select rod 9 in a predetermined direction, the select actuator 13 engages the lever 11 with an engaging member 8 fixed to a predetermined shaft 6 via a guide 10. Next, shift actuator 1
2 moves the lever 11 along the guide 10 by sliding the shift rod 2 in a predetermined direction, and shifts the gear to a desired shift position via the lever 11 → the engagement member 8 → the shaft 6.
By shifting the gears, the gear ratio is changed to the one designated by the computer 14, so that the transmission executes the desired speed change operation.

In such a shift operation, the position of the gear before and after the shift is sequentially detected because the magnet 3 fixed to the shift rod 2 is constantly detected by each Hall IC 4a, 4b, 4c. The results are input into the computer 14 at any time. Based on this detection result, the computer 14 automatically and appropriately executes the above-mentioned speed change operation.

Here, in the gear transmission according to the above configuration, the mechanical tolerance range in the neutral state is usually smaller than that in the shifted state. Therefore, in the shift operation described above, the magnet detection range La of the neutral position Hall IC4a that detects the neutral position of the gear is different from that of the left and right shift position Hall IC4 as shown in FIG.
It is necessary to set it smaller than the magnet detection ranges Lb and Lc of magnets b and 4c.

By the way, as shown in FIG. 3, if the detection range for the magnet 3 in the Hall IC 4' to which no iron piece is attached is L', as shown in FIG. Since the magnetic field of the magnet 3 is deflected by the iron piece 5, the detection range L for the same magnet 3 in the Hall IC 4 to which the magnet 5 is attached becomes larger than L'. Since this amount of increase (L-L') depends on the size of the iron piece 5, by making the size of the iron piece 5 attached to the Hall IC 4 different,
The detection range for the magnet 3 of each Hall IC 4 can be made different.

Therefore, in this embodiment, iron pieces 5a, 5b, and 5c are respectively attached to the hole ICs 4a, 4b, and 4c for detecting the magnet 3, and the size of the iron piece 5a attached to the neutral position hole IC 4a is set to the left side. By making the size smaller than the iron pieces 5b and 5c attached to the right-side shift position Hall ICs 4b and 4c, respectively, the detection range La of the neutral position Hall IC 4a is
Hall IC4b, 4 for left and right shift positions
c is made smaller than the detection ranges Lb and Lc.
Thereby, differences in mechanical tolerance ranges between the neutral state and the shifted state can be accommodated as desired.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified without departing from the gist thereof.
It goes without saying that various changes are possible.

For example, the magnet and each Hall IC are not limited to being placed on the shift rod and the machine frame, but they may be replaced with each other, or they may be placed on the select rod, lever, shaft, special stay for installing the Hall IC, etc. You can. In short, the magnet and each Hall IC may be relatively disposed between an operating member for operating a predetermined gear and a fixed member facing the operating member.

The magnetoresistive element is not limited to a Hall element, but may also be a magnetoresistive element. Further, the circuit to which the magneto-electric effect element is connected is not limited to an IC, and a discrete circuit may be used.

In the above embodiment, the case where it is used as a gear position detection device to realize automatic control in an electronically controlled gear transmission has been explained, but the present invention can also be used in other transmissions to check the operation, etc. It can be used to detect the gear position, etc.

[Effect of idea]

As explained above, according to the present invention, even if there is a single magnet, the detection ranges of the magnetoelectric effect element in the middle position and the magnetoelectric effect elements in the positions on both sides can be made different. Due to the difference, it is possible to deal with the difference in mechanical tolerance range between the neutral state and the shifted state, and as a result, costs can be reduced by reducing the number of parts and assembly man-hours.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a gear position detection device for an electronically controlled gear transmission which is an embodiment of the present invention;
FIG. 2, FIG. 3, and FIG. 4 are schematic diagrams for explaining the operation. FIG. 5 is a schematic diagram showing a conventional example. 1... Machine frame (fixed member), 2... Shift lever (operating member), 3... Magnet, 4a, 4b, 4
c...Hall IC (IC having a Hall element as a magneto-electric effect element), 5a, 5b, 5c... Iron piece (small piece made of magnetic material), 6... Shaft, 8... Engaging member, 9... Select rod , 10... Guide, 11... Lever, 12, 13... Actuator, 14... Computer.

Claims (1)

[Scope of utility model registration request] A magnet and a plurality of magneto-electric effect elements for detecting the magnet are respectively disposed between an operating member that executes a speed change operation by operating a predetermined gear and a fixed member opposing the operating member. , a gear position detection device for a transmission configured to detect a neutral position of a gear and moving positions on both sides of the gear by detecting a magnet in a magnetoelectric effect element; The transmission is characterized in that the small pieces attached to the magnetoelectric effect element at the neutral position are different in size from the small pieces attached to the magnetoelectric effect elements at both sides thereof. Gear position detection device.