The present utility model relates to a sensor, a linear driving device, an exhaust gas recirculation control valve, and an engine.
In industries such as the automotive industry, a valve device able to be precisely controlled is generally required, for example, an exhaust gas recirculation control valve for use in an engine exhaust gas recirculation system. In such a valve device, a linear driving device able to be precisely controlled is required, and it is desirable that this valve device can be as light as possible and miniaturized.
Such a linear driving device and valve device are disclosed in CN 203442281 U, for example. The current position of an output connecting rod is detected by a sensor and is transferred to a control device, so as to control the exhaust gas recirculation control valve.
However, when the whole connecting rod assembly rotates, a sensor pointer may also rotate, that is to say, a signal about a linear position may be interfered with by the rotation of the pointer. Hence, there is the problem of an imprecise sensor signal caused by the rotation of the connecting rod assembly.
The technical problem to be solved by the present utility model is that of providing a sensor, a linear driving device and a corresponding exhaust gas recirculation control valve, which solve the problem of an imprecise sensor signal caused by the rotation of the connecting rod assembly.
A sensor is proposed according to the present utility model, said sensor being used to detect the position of a movable part, and comprising a pointer rigidly connected to said movable part and a circuit structure interacting with the pointer, wherein a component of said circuit structure is arranged on the side of the circuit structure facing away from the pointer.
According to one preferred embodiment, said circuit structure is a printed circuit board. Further preferably, said pointer is rigidly connected to said movable part via a bracket. Further preferably, said pointer is fixed onto said bracket by insert molding. Further preferably, said bracket is fixed onto said movable part by insert molding. Further preferably, the end face of said pointer facing toward the circuit structure has a circular arc shape. Further preferably, said sensor is an inductive sensor.
A linear driving device is proposed according to the present utility model, comprising: an electric motor; a speed-reducing transmission stage comprising a pinion gear fixedly connected to an output shaft of the electric motor and a transmission gear meshing with the pinion gear; a linear transmission stage for transforming a rotational movement of said transmission gear into a linear movement of a movable part; and a sensor for detecting the position of said movable part, comprising a pointer rigidly connected to the movable part and a circuit structure interacting with the pointer, wherein a component of said circuit structure is arranged on the side of the circuit structure facing away from the pointer.
According to one preferred embodiment, said circuit structure is a printed circuit board. Further preferably, said pointer is rigidly connected to said movable part via a bracket. Further preferably, said pointer is fixed onto the bracket by insert molding. Further preferably, said bracket is fixed onto the movable part by insert molding. Further preferably, the end face of said pointer facing toward the circuit structure has a circular arc shape. Further preferably, said sensor is an inductive sensor. Further preferably, said transmission gear is a sector gear. Further preferably, said linear driving device comprises a restoring system for restoring without electricity, and said restoring system comprises a spring directly or indirectly applying a restoring action to the transmission gear.
The present utility model further relates to an exhaust gas recirculation control valve comprising the above-mentioned linear driving device, and to an engine comprising the exhaust gas recirculation control valve.
A sensor, a linear driving device, an exhaust gas recirculation control valve and an engine according to embodiments of the present utility model are described below with reference to the accompanying drawings. In the following description, many specific details are set forth in order to give those skilled in the art a more comprehensive understanding of the present utility model. However, it will be apparent to a person skilled in the art that the present utility model may be achieved without some of these specific details. In addition, it should be understood that the present utility model is not limited to the specific embodiments presented. Instead, it is envisaged herein that any combination of the following features and elements can be used to implement the present utility model, regardless of whether or not they are involved in different embodiments. Therefore, the following aspects, features, embodiments and advantages are merely illustrative and should not be regarded as elements or definitions of the claims, unless explicitly stated in the claims.
In the prior art, various components 13 of the printed circuit board 12 are usually arranged on the side of the printed circuit board 12 facing toward the pointer 4 (see
Therefore, the present utility model proposes that various components 13 of a printed circuit board 12 are arranged on the side of the printed circuit board 12 facing away from the pointer 4 (see
On the other hand, a pointer (see
1. An output of the sensor 3 is the position where the pointer 4 moves in a y direction (see
2. The movable part rotating in a relatively large amplitude may also cause the pointer 4 to come into contact with and scrape the printed circuit board 12 of the sensor 3, destroying parts of the sensor 3, and the sensor 3 is thus damaged.
3. The existing pointer 4 is fixed to the movable part via a plastic member by means of interference press fit, snap-fitting or screwing, etc., but since the plastic member may fall off due to the effect of temperature, and severe environmental factors such as vibration, a signal problem occurs.
4. The existing pointer 4 is generally fixed to the plastics in an adhesive or printing method, but the process is complicated and has high costs.
Therefore, the present utility model proposes that the end face of the pointer 4 facing toward the printed circuit board 12 is arc-shaped, see
In addition, the pointer 4 is fixed using an insert molding method, for example, both the pointer 4 and the bracket 10 can be fixed by insert molding. Therefore, a simpler process, a higher reliability and lower costs are achieved.
Taking a linear driving device of an exhaust gas recirculation control valve for use in the engine exhaust gas recirculation as an example, the linear driving device according to the present utility model will be explained below, but the present utility model is not limited thereto. The linear driving device according to the present utility model can be used with any equipment requiring small precise linear control, such as a variety of valves and actuators.
In order to avoid the ingress of dust or other foreign substances and consequent damage to the transmission device, a housing 11 and a corresponding sealing system are provided. The first transmission stage, i.e. the speed-reducing transmission stage, comprises a pinion gear 5 fixedly connected to an output shaft of the electric motor and a transmission gear 6 meshing with the pinion gear 5. When the motor 2 operates, the pinion gear 5 is driven to rotate, so that the transmission gear 6 meshing with the pinion gear 5 is rotated.
The second transmission stage is a linear transmission stage for transforming a rotational movement of the transmission gear 6 into a linear movement of the movable part 7. The second transmission stage comprises a spiral groove 8 formed on the transmission gear 6, a follower 9 received in the groove 8, and the movable part 7 fixedly connected to the follower 9.
The movable part 7 is arranged in a sleeve member (not shown), and is thus only able to linearly move up and down. When the transmission gear 6 rotates, the follower 9 is displaced along the groove 8, and owing to the spiral shape of the groove 8, the follower 9 moves up or down, thereby driving the movable part 7 to move up and down.
In order to enable the movable part 7 to return back to its initial position even if the electric motor 2 malfunctions or is de-energized, the linear transmission device preferably further comprises a restoring system for restoring without electricity, which is not shown. As is well known, when the electric motor is energized, the driving thereof in two opposite directions can achieve driving and restoring. However, when the electric motor is de-energized (for example, due to a failure or for other reasons), it is desirable that the transmission device can restore to the initial position, so that there is a need for such a restoring system. Said restoring system comprises a spring directly or indirectly applying a restoring action to the transmission gear 6.
The linear driving device 1 further comprises a sensor 3 according to the present utility model, which is used to detect the position of a movable part, i.e. the movable part 7, and to transfer the position to a control device so as to control the exhaust gas recirculation control valve.
While the present utility model has been disclosed above by means of the relatively preferred embodiments, the present utility model is not limited thereto. A variety of changes and modifications made by a person skilled in the art, without departing from the spirit and scope of the present utility model, should be included in the scope of protection of the present utility model, and thus the scope of protection of the present utility model should be defined by the claims.
1 Linear driving device
2 Electric motor
3 Sensor
4 Pointer
5 Pinion gear
6 Transmission gear
7 Movable part
8 Groove
9 Follower
10 Bracket
11 Housing
12 Printed circuit board
13 Component
Number | Date | Country | Kind |
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201420754847.4 | Dec 2014 | CN | national |
Number | Date | Country | |
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Parent | PCT/IB2015/002284 | Dec 2015 | US |
Child | 15605084 | US |