JPH0627873Y2 - Gear position sensor for transmission - Google Patents

Description

Detailed Description of the Invention a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear position sensor for a vehicle transmission, and more particularly to a non-contact type gear position sensor using a magnetoelectric conversion element and a magnet.

b. 2. Description of the Related Art Conventional technology and its problems In a transmission operating device for remotely operating an automobile transmission by an actuator or an electronically controlled automatic transmission, it is necessary to check the gear position of the transmission and control the actuators. A gear position sensor is provided.
FIG. 9 shows a conventional transmission operating device,
Two so-called contact type gear position sensors 1 and 2 are used in this device. One gear position sensor 1 is arranged near the end of the select rod 4 of the select actuator 3, and the other gear position sensor 2 is arranged near the end of the shift rod 6 of the shift actuator 5. Each of the gear position sensors 1 and 2 comprises three limit switches 1a and 2a. When the change lever 7 is operated to move the select rod 4 or the shift rod 6 to a predetermined position, one of the limit switches 1a and 2a The flange-shaped ends 4a and 6a of the valves 4 and 6 are pressed to turn on, and this signal is input to the controller 8 to detect the gear position of the transmission 9.

In FIG. 9, 10 is an air tank, 11 to 14 are solenoid valves,
Reference numeral 15 is an indicator lamp, and 16 is an abnormality alarm.

The conventional gear position sensors 1 and 2 are configured as described above, but since the gear position sensors 1 and 2 are contact type, there is a problem in reliability and durability against chattering and dirt of the limit switches 1a and 2a. was there.

Incidentally, in recent years, in order to solve such a problem, a non-contact type gear position sensor using a magnet and a Hall element or a Hall IC has been proposed (Shokai 59-116659).
This technology is for a shift / select rod integrated type, and its contents are different from the technology according to the present invention.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gear position sensor for a transmission that is excellent in reliability and durability.

c. Means for Solving the Problems In the present invention, in order to achieve the above object, a magnet is provided at each end of rods of a shift actuator and a select actuator driven based on a change lever operation signal. Then, in the gear position sensor of the transmission in which a plurality of magnetoelectric conversion elements that detect the magnetism of the magnets are arranged on the cover side that surrounds the ends of these rods, among the plurality of magnetoelectric conversion elements, A magnetoelectric conversion element that detects that each rod of the shift actuator and the selection actuator is located at the central position is installed farther from the magnet than the other magnetoelectric conversion elements, and thus the central portion is provided. The sensitivity width of the magnetoelectric conversion element for detecting that it is located at is made narrower than that of the other magnetoelectric conversion elements.

d. Embodiment Hereinafter, an embodiment of a gear position sensor for a transmission according to the present invention will be described in detail with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention.

The gear position sensor 20 of the present embodiment has a shift actuator 21 and a select actuator (because they have substantially the same configuration as the shift actuator 21, the shift actuator 21 will be referred to and the description and illustration thereof will be omitted. ) Is prepared for. The shift actuator 21 (or select actuator) has a shift rod 22 (or select rod) driven based on an operation signal from a change lever (not shown).
At the end 22a of the shift rod 22 (or the select rod), a support body 23 formed of a non-magnetic material such as aluminum in a cylindrical shape is rotatable and slidable with respect to the shift rod 22 (or the select rod). It is fixedly attached. The support 23 has a guide groove 23a extending in the axial direction on one side thereof. In addition, a cover 24 that surrounds the support 23
From the inner side wall 24a, a detent key 25 projects inward and engages with the guide groove 23a of the support 23. The rotation prevention key 25 allows the support body 23 to be non-rotatable and forward-movable with respect to the cover 24.

One permanent magnet 26 is embedded in the upper part of the outer side wall of the support body 23 in a manner to expose a part to the outside. Also this magnet
Corresponding to 26, Hall elements 27, 28, 29, which are one of magnetoelectric conversion elements, are axially arranged on the cover 24 side. As these Hall elements 27, 28, 29, the same products having exactly the same ability are used. Hall element 27, 2
The reference numerals 8 and 29 are provided on the printed circuit board 30, and are fixed to the recess 24b formed in the outer peripheral wall of the cover 24 via the support plate 31. These hall elements 27, 28, 29
Are connected to an external controller (not shown) via lead wires 27a, 28a, 29a, respectively.

Here, in the case of the shift actuator 21, the hall element 27 detects that the magnet 26 is at any position corresponding to the back R, the second speed, and the fifth speed. Further, the Hall element 28 detects that the magnet 26 is located at the neutral position, that is, at any of the central positions N ₁ , N ₂ and N ₃ . Hall element 29
Detects that the magnet 26 is in any one of positions corresponding to the first speed, the third speed, and the fourth speed. The Hall elements 27 and 29 may of course be arranged so as to detect mutually opposite positions.

Similarly, considering the case of the select actuator this time, the hall element 27 detects that the magnet 26 is in any one of the fifth speed, the center position N ₃ and the fourth speed, The element 28 detects that the magnet 26 is in any of the positions corresponding to the second speed, the central position N ₂ and the third speed, and the hall element 29 detects that the magnet 26 is in the back R, the central position N ₁ and the third position. It is detected that the vehicle is in any position corresponding to the first speed.

FIG. 4 conceptually shows the characteristic portion of this embodiment. That is, the Hall elements 27 and 29 are floated from the printed circuit board 30 by a predetermined distance and fixed to the printed circuit board by soldering, whereas the Hall element 28 is the printed circuit board.
It is abutted on 30 and fixed by soldering. As a result, the distance d ₃ of the Hall element 28 to the magnet 26 is set to be larger than any of the distances d ₁ and d ₂ of the other Hall elements 27 and 28 to the magnet 26. The distances d ₁ and d ₂ in the Hall elements 27 and 29 can be easily determined to be appropriate distances by changing the length of each foot (lead). As a method of floating the Hall elements 27, 29, it is of course possible to interpose a stand such as a spacer between the Hall elements 27, 28 and the printed circuit board 30.

FIG. 5 and FIG. 6 show the relationship between the deviation S of the magnet 26 and the electromotive force Vout generated by the Hall element 28 (27 or 29 may be used), and the distance between the magnet 26 and the Hall elements 27, 29 and 28. d to d
₁ (= 0.62 mm), d ₂ (= 1.32 mm) and d ₃ (= 1.93 mm)
It shows the case of setting to.

In the case of the present embodiment, when the electromotive force Vout generated by the Hall element 28 (or 27, 29) reaches a certain set voltage Vth or higher, the magnetic detectable range of the Hall element 28 (or 27, 29) (hereinafter referred to as the detection width L). It is assumed that it is detected that the magnet 26 is positioned inside.

As is apparent from FIG. 6, the detection width L of the Hall element 28 (or 27, 29) is L with respect to the distances d ₁ , d ₂ , d ₃ .
_A (= 4.2mm), L _B (= 3.6mm), L _C (= 2.4mm).
Here, L _A > L _B > L _C >. That is, it can be seen that the detection width L decreases as the distance d increases.

Therefore, in the present embodiment, the detection width L _C in the Hall element 28 is the detection width L _A in the other Hall elements 27, 29.
It is narrower than L _B. Therefore, in this embodiment, it is possible to obtain the same effect as using a Hall element of the same product having the same ability as if using a Hall element of another product having a different ability.

Further, as is clear from the above, the same applies to the case of the select actuator, and in this case as well, the detection width suitable for the select actuator can be obtained by appropriately setting the distance d. Hall element 28 for detecting the central position of the magnet 26 in the select actuator
The detection width L _C can be easily set smaller than the detection widths L _A and L _B of the other Hall elements 27 and 29 (see FIG. 3).

In FIG. 3, a line 32 conceptually shows the movable range of the magnet 26 attached to the shift rod 22 of the shift actuator 21, and a line 33 shows the movable range of the magnet 26 attached to the select rod of the select actuator. The area is shown conceptually.

By the way, in general, the stroke S in the axial direction of the shift rod 22 of a transmission for an automobile is often different depending on each shift stage (see FIG. 3), and each shift stage should be covered with the same detection width L. If so, a very large width is required as the detection width L, and as a result, the detection width at the neutral position (or the center position) remains set to a large value, so the neutral position becomes unclear and gear entanglement occurs. The system was easy to do. Originally, it is preferable to make the detection width at the neutral position as small as possible.

The present invention fully satisfies this conventional need, as already described.

7 and 8 show another embodiment of the gear position sensor of the transmission according to the present invention. In FIGS. 7 and 8, those having the same functions as those shown in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In this embodiment, as in the case of the previous embodiment, three Hall elements 27, 28, 29 having the same performance are used. In the case of this embodiment, a Hall element for detecting that the magnet 26 is in the neutral position (or the central position)
28 is offset laterally from the other Hall elements 27, 29 by a distance l and fixed to the printed circuit board 30 by soldering. As a result, the distance between the Hall element 28 and the magnet 26
d ₃ can be set easily greater than the distance d ₁ for magnets 26 of the Hall element 27, 29. Therefore, also in this embodiment, as in the case of the previous embodiment, the Hall element for detecting the neutral position (or the central position).
The detection width of 28 can be set smaller than the detection widths of the other hawk elements 27 and 29.

Although the Hall element is used as the magnetoelectric conversion element in both of the above-described embodiments, the present invention is not limited to this, and any element such as a Hall IC having a magnetoelectric conversion function may be used.

When the magnetoelectric conversion element is arranged on the printed board, an amplifier and a comparator may be arranged together with the magnetoelectric conversion element.

e. Effect of the Invention As described above, according to the gear position sensor of the transmission according to the present invention, the magnets are provided at the ends of the rods of the shift actuator and the select actuator that are driven based on the operation signal of the change lever. Is installed,
In a gear position sensor of a transmission, wherein a plurality of magnetoelectric conversion elements for detecting the magnetism of the magnet are arranged on the side of the cover surrounding the ends of these rods, the shift of the plurality of magnetoelectric conversion elements is used. A magnetoelectric conversion element that detects that the rods of the actuator for selection and the rod of the selection actuator are in the central position is installed farther from the magnet than the other magnetoelectric conversion elements. Since the sensitivity range of the magnetoelectric conversion element for detecting that the above condition is set is made narrower than that of the other magnetoelectric conversion elements, the following effects can be obtained.

That is, the gear position sensor of the transmission according to the present invention has the same performance without using a large number of magnetoelectric conversion elements, aligning elements having different performances, or using a shield plate or the like. By using an element, you can easily set the detection width of that element to be smaller than the detection width of other elements simply by offsetting the element that detects the neutral position (or center position) of these elements to the left or right or upward. You can Therefore, it is possible to prevent an increase in cost in element purchase.

Further, the structure of the present invention in which the magnetoelectric conversion elements are installed offset in the horizontal direction or the vertical direction is very simple. Therefore, it is possible to prevent an increase in size of the device and an increase in manufacturing cost.

Further, as in the present invention, by setting the detection width of the magnetoelectric conversion element for detecting the neutral position (or the central position) to be small, it is possible to effectively prevent various troubles related to gear change such as gear entanglement.

[Brief description of drawings]

1 to 4 show an embodiment of a gear position sensor of a transmission according to the present invention. FIG. 1 is a sectional view of a main part thereof, FIG. 2 is a partially broken sectional view thereof, and FIG. FIG. 4 is a diagram showing the operating range of the shift actuator and the select actuator, and FIG. 4 is a conceptual diagram showing an enlarged main part thereof.
5 and 6 are views showing the relationship between the magnet and the magnetoelectric conversion element, and FIGS. 7 and 8 show another embodiment of the gear position sensor of the transmission according to the present invention. FIG. 7 is a plan view conceptually showing the positional relationship of the magnetoelectric conversion elements, FIG. 8 is a cross-sectional view of an essential part thereof, and FIG. 9 is a cross-sectional view showing a gear position sensor of a conventional transmission. 20 …… Gear position sensor, 21 …… Shift actuator, 22 …… Shift rod, 23 …… Support, 23a …… Guide groove, 24 …… Cover, 25 …… Locking key, 26 …… Magnet, 27 , 28, 29 …… Hall element, 30 …… Printed circuit board.

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H01L 43/08 9274-4M

Claims (3)

[Scope of utility model registration request] 1. A magnet is provided at the end of each rod of a shift actuator and a select actuator driven based on a change lever operation signal, and a cover is provided on the side of the cover surrounding the end of these rods. In a gear position sensor of a transmission including a plurality of magnetoelectric conversion elements for detecting the magnetism of the magnet, the shift actuator and the select actuator have rods at the center of the plurality of magnetoelectric conversion elements. The magnetoelectric conversion element that detects that the position is located farther from the magnet than the other magnetoelectric conversion elements, and thus the sensitivity range of the magnetoelectric conversion element that detects that it is in the central position is set. A gear position sensor for a transmission, characterized in that it is made narrower than that of the other magnetoelectric conversion element. 2. A utility model registration claim according to claim 1, wherein a magnetoelectric conversion element other than the magnetoelectric conversion element for detecting that it is in the neutral position is projected toward the rod side through a projecting means. ) The gear position sensor of the transmission according to the item. 3. A utility model registration claim, characterized in that the magnetoelectric conversion element for detecting that it is in the neutral position is installed so as to be offset from the other magnetoelectric conversion elements in the circumferential direction.
The gear position sensor of the transmission according to item (1).