JP2512673Y2 - Rotation detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a rotation detecting device, particularly a rotation detecting device mounted on a transmission of an automobile or the like and converting the rotation of the transmission into an electric signal and outputting the electric signal to an indicating instrument. Regarding

[Conventional technology]

Conventionally, as a vehicle speed sensor mounted on an automobile, the rotation in the transmission of the automobile is transmitted to a magnet disposed in the vicinity of the magnetic sensitive element, and the change in the magnetic field due to this rotation is detected by the magnetic sensitive element to be detected by the magnetic sensitive element. Semiconductor type rotation detection, which outputs the generated electrical signal to various indicating instruments, is often used.

FIG. 3 shows such conventional rotation detection.
This rotation detecting device 1 has a cylindrical housing 2, and at one end of the housing 2, a mounting recess 4 having a female screw 3 formed on the inner peripheral surface is formed. A seal packing 5 is provided on the end surface of the mounting recess 4 to prevent water from entering the inside and oil from flowing out.

A rotor 6 is rotatably disposed inside the housing 2, and the rotor 6 has, for example, an end surface portion thereof.
6a is magnetized in multiple poles. An input rotary shaft 8 rotatably supported by a bearing 7 is fitted in the center of the rotor 6, and a rotary drive source such as a transmission (not shown) is provided inside the input rotary shaft 8. One end of the coupling 9 to be connected is the mounting recess 4
It is inserted so as to be located at. The housing 2 is fixed by screwing the mounting recess 4 of the housing 2 into the sensor mounting portion 11 on the vehicle body side where the male screw 10 is formed on the outer peripheral surface, and then tightening the housing 9 in this state. The rotation of the transmission is transmitted to the rotor 6 via the input rotation shaft 8.

In addition, inside the housing 2, the rotor 6
A magnetic sensitive element 12, such as a Hall element, is disposed near the rotor 6 in the vicinity of the rotor 6.
12 and the end surface portion 6a of the rotor 6 face each other. Further, a terminal 13 for sending an electric signal generated by the magnetic sensitive element 12 to an indicator (not shown) or the like is attached.

In the conventional rotation detecting device 1, the rotation of the transmission of an automobile or the like is transmitted to the input rotary shaft 8 and the rotor 6 via the coupling 9, and the rotation of the rotor 6 causes the magnetic sensitive element 12 to generate. By outputting an electric signal to a predetermined indicating instrument through the terminal 13,
The speed is displayed according to the value of the electric signal.

[Problems to be solved by the device]

However, in the above-described conventional rotation detecting device 1, since the housing 2 is fixed to the sensor mounting portion 11 by tightening with screws, vibration or temperature change occurring during use of the device, or the housing 2 or There is a problem that the screws 3 and 10 are loosened due to the creep of the sensor mounting portion 11 and the housing 2 cannot be securely fixed, and the detection reliability is significantly reduced. Therefore, conventionally, the female screw 3 of the housing 2 is used.
An adhesive for preventing loosening is applied to the portion or the male screw 10 portion of the sensor mounting portion 11 to prevent loosening in the screw portion.

However, with the means using the above-mentioned adhesive, once the screw 3,10
After tightening, the adhesive adheres to the screws 3 and 10 parts, and if the screws 3 and 10 become loose, it will be extremely difficult to tighten them again. Even if the tightening can be performed, there is a problem that the tightening torque at the time of re-tightening becomes lower than the initial tightening torque. Moreover, since steps such as application of adhesive and drying are required,
There is a problem that the manufacturing time is long and the manufacturing cost is high.

The present invention has been made in view of the above points, and an object of the present invention is to provide a rotation detection device that can reliably prevent loosening of screws without using an adhesive or the like.

[Means for solving the problem]

In order to achieve the above-mentioned object, the rotation detecting device according to the present invention forms a mounting recess at one end of the housing that is screwed into the sensor mounting part from the outside, and arranges a seal member on the end face of the mounting recess. In a rotation detecting device in which a rotor having a magnetic force is rotatably disposed inside a housing in the vicinity of a magnetic sensitive element, and the rotor is connected to a rotation output source via a coupling, an end face of the mounting recess is provided. A spring member is disposed between the seal member and the seal member, and the sensor mounting portion is screwed into the mounting recess, and the restoring force of the spring member causes the spring member to move away from the end face of the mounting recess. The present invention is characterized in that the seal member is biased and the sensor mounting portion is biased in the separating direction by the biased seal member.

[Action]

According to the present invention, the spring member biases the seal member in the direction away from the end surface of the mounting recess in the state where the housing is screwed to the sensor mounting portion, and the biased seal member is the sensor. By urging the mounting part toward the above-mentioned separating direction, the male screw of the sensor mounting part can be used regardless of occurrence of vibration or temperature change during use of the device, or creep of the housing or sensor mounting part. The slant surface opposite to the end surface side of the mounting recess is pressed against the slant surface opposite to the end surface side of the mounting recess by the female thread of the mounting recess so that both are always in close contact, and the male screw of the sensor mounting portion and the female screw of the mounting recess are attached. There is no play between and.

Therefore, the housing can be reliably fixed to the sensor mounting portion, and the reliability of rotation detection can be significantly improved.

Further, unlike the conventional case, since the loosening of the screws is not prevented by using an adhesive, it is possible to re-tighten extremely easily and with an appropriate tightening torque. Since processes such as application of an adhesive and drying are not necessary, it can be manufactured quickly and at low cost.

Further, the biasing of the sensor mounting portion in the direction away from the end surface of the mounting recess is not directly performed by the spring member, but indirectly through the seal member that contacts both the spring member and the sensor mounting portion. It is possible to prevent the sensor mounting portion from being damaged by the direct contact of the spring member, and reliably prevent the rotation detection accuracy of the sensor from being deteriorated.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

1 and 2 show an embodiment of the present invention, in which a rotation detecting device 1 has a cylindrical housing 2, and one end of the housing 2 has an inner peripheral surface. A mounting recess 4 having a female screw 3 is formed. Further, in the present embodiment, a seal packing 5 for preventing intrusion of water into the inside and outflow of oil to the outside is disposed on the end surface of the mounting recess 4. Between the inner surface and the end surface of the mounting recess 4, there is disposed a leaf spring 14 as a spring member that biases the seal packing 5 in a direction away from the end surface of the mounting recess 4.

Inside the housing 2, for example, a roller 6 whose end face a is magnetized in multiple poles is rotatably disposed, and a bearing 7 is rotatably supported by a bearing 7 at the center of the rotor 6. At the same time, an input rotary shaft 8 having a coupling 9 connected to a rotary drive source such as a transmission (not shown) is fitted inside. Then, the housing 2 is fixed by screwing the mounting recess 4 of the housing 2 into the sensor mounting portion 11 on the vehicle body side having an external thread formed on the outer peripheral surface thereof and tightening the same. The rotation of the transmission is transmitted to the rotor 6 via the input rotation shaft 8.

In addition, inside the housing 2, the rotor 6
A magnetic sensitive element 12, such as a Hall element, is disposed near the rotor 6 in the vicinity of the rotor 6.
12 and the end surface portion 6a of the rotor 6 face each other. Further, a terminal 13 for sending an electric signal generated by the magnetic sensitive element 12 to an indicator (not shown) or the like is attached.

 Next, the operation of this embodiment will be described.

In this embodiment, the rotation of the automobile transmission is transmitted to the input rotary shaft 8 and the rotor 6 via the coupling 9, and the rotation of the rotor 6 causes an electric signal generated by the magnetic sensitive element 12 to be instructed to a predetermined direction. By outputting to a measuring instrument, speed display or the like according to the value of the electric signal is performed.

In this embodiment, the leaf spring 14 biases the seal packing 5 in the direction away from the end face of the mounting recess 4 with the housing 2 screwed to the sensor mounting portion 11. The seal packing 5 is the sensor mounting part 11
Is urged in a direction away from the end surface of the mounting recess 4, thereby causing vibration and temperature change during use of the device,
Alternatively, regardless of the occurrence of creep or the like of the housing 2 and the sensor mounting portion 11, the slope of the male screw 10 of the sensor mounting portion 11 opposite to the end face side of the mounting recess 4 is fixed by the female screw 3 of the mounting recess 4. The concave portion 4 is pressed against the sloped surface on the side opposite to the end surface side so that they are always in close contact with each other, and the male screw 10 of the sensor mounting portion 11
There is no play between the female screw 3 of the mounting recess 4 and the female screw 3.

Therefore, the housing 2 can be reliably fixed to the sensor mounting portion 11, and the reliability of rotation detection can be significantly improved.

Moreover, unlike the conventional method, the adhesive is not used to prevent the screws 3 and 10 from loosening, so that when tightening again, it is extremely easy and can be tightened with an appropriate tightening torque. Moreover, the application of adhesive,
Since a process such as drying is unnecessary, it can be manufactured quickly and at low cost.

Further, when the housing 2 is made of resin, it is particularly effective as a means for preventing loosening of the screws 3 and 10 against creep.

Further, in the present embodiment, the urging of the sensor mounting portion 11 in the direction away from the end surface of the mounting recess 4 is not directly performed by the leaf spring 14, but the leaf spring 14 and the sensor mounting portion 11 are urged.
Since it is indirectly performed via the seal packing 5 that contacts both of them, it is possible to prevent the sensor mounting portion 11 from being damaged by the direct contact of the leaf spring 14 and surely prevent the rotation detection accuracy of the sensor from being deteriorated.

[Effect of device]

As described above, in the rotation detecting device according to the present invention, the spring member is arranged between the end surface of the mounting recess formed at one end of the housing and the seal member, and the seal member is mounted by the spring member. The sensor mounting portion, which is biased in the direction away from the end face of the recess, and in which the mounting recess is screwed from the outside, is screwed into the mounting recess by the seal member biased by the spring member. The bias is applied in a direction away from the end surface of the mounting recess.

Therefore, regardless of the occurrence of vibration or temperature change during use of the device, or the occurrence of creep or the like of the housing or the sensor mounting part, the external thread of the sensor mounting part can be used to remove the sloped surface on the side opposite to the end surface side The internal thread of the mounting recess is pressed against the sloped surface on the side opposite to the end surface of the mounting recess, and the two are always in close contact, and there is no rattling between the male thread of the sensor mounting section and the female thread of the mounting recess. Therefore, the housing can be securely fixed to the sensor mounting part,
The reliability of rotation detection can be significantly improved.

Further, unlike the conventional case, since the loosening of the screws is not prevented by using an adhesive, it is possible to re-tighten extremely easily and with an appropriate tightening torque. Since steps such as application of an adhesive and drying are not required, it can be manufactured quickly and at low cost.

Further, the biasing of the sensor mounting portion in the direction away from the end surface of the mounting recess is not directly performed by the spring member, but indirectly through the seal member that contacts both the spring member and the sensor mounting portion. It is possible to prevent the sensor mounting portion from being damaged by the direct contact of the spring member, and reliably prevent the rotation detection accuracy of the sensor from being deteriorated.

[Brief description of drawings]

1 is a vertical sectional view showing an embodiment of a rotation detecting device according to the present invention, FIG. 2 is a vertical sectional view of a mounting recess portion of FIG. 1, and FIG. 3 is a vertical sectional view showing a conventional rotation detecting device. Is. 1 ... Rotation detecting device, 2 ... Housing, 3 ... Female screw, 4 ... Mounting recess, 5 ... Seal packing, 6 ... Rotor, 9 ... Coupling, 10 ... Male screw, 11 ... Sensor mounting Part, 12 ... Magnetic sensitive element, 14 ... Leaf spring.

Claims (1)

(57) [Scope of utility model registration request] 1. A rotor having magnetic force inside the housing, wherein a mounting recess is formed at one end of the housing, the mounting recess being screwed into the sensor mounting portion from the outside, and a seal member is disposed on the end face of the mounting recess. In a rotation detecting device, which is rotatably disposed in the vicinity of a magnetically sensitive element and is connected to a rotation output source via a coupling, a spring member is provided between an end face of the mounting recess and the seal member. And the sensor mounting portion is screwed into the mounting recess, the restoring force of the spring member urges the seal member in a direction away from the end surface of the mounting recess, A rotation detecting device, wherein the sensor mounting portion is biased in the separating direction by a biased seal member.