Rotating speed detection device for engine

Abstract

The invention relates to the technical field of engine rotating speed detection equipment, and particularly discloses a rotating speed detection device for an engine, a flywheel of the engine is provided with a detection piece, the detection piece comprises a seat ring and an inner ring, the inner ring is coaxially and rotatably arranged in the seat ring, and a rotating speed sensor is arranged on the inner ring and can move in the radial direction of the inner ring. After the seat ring is butted with an engine through a plurality of connecting pieces, the flywheel is arranged in an inner cavity of the inner ring; the connecting piece comprises a first sliding seat, a first sliding rod and a pin, a long sliding hole is formed in the seat ring in the radial direction, the first sliding rod is suspended above the long sliding hole, the first sliding rod is slidably sleeved with the upper end of the first sliding seat, and the lower end of the first sliding seat is slidably arranged in the long sliding hole; the pins are arranged at the bottom of the first sliding seat, a plurality of pin holes are formed in the engine in an annular array mode, and the pins are arranged in the pin holes respectively. According to engines of different models, rotation speed detection can be carried out under the condition that the spatial position of a detection point of a rotation speed sensor is changed due to the fact that the spatial positions and sizes of flywheels are different.

Description

Technical Field

[0001] The present invention relates to the technical field of engine speed detection equipment, and in particular to a speed detection device for an engine. Background Art

[0002] With the development of automobile control technology, there are more and more electronic and electrical components in automobiles. The speed sensor on the existing automobile engine is generally installed on the housing of the gearbox to detect the speed of the engine.

[0003] In the early stage of engine production, the gearbox has not been assembled. When detecting the engine speed, the engine is usually installed on a test bench, and then the engine speed is detected by the speed sensor on the test bench. When the engine is tested on the test bench, since the gearbox is not installed, the speed sensor needs to be installed on the test bench through a specific bracket to ensure that the speed sensor and the speed signal wheel at the rear end of the flywheel are close to each other. For different types of engines, the spatial position and size of the flywheel are different, and the spatial position of the speed sensor detection point is also changing. After the speed sensor is initially installed, it needs to be constantly debugged to achieve the best detection position. Each adjustment of the speed sensor position requires a lot of time and manpower, and thus a speed detection device for the engine is needed, which can quickly detect the speed of multiple types of engines. Summary of the invention

[0004] The object of the present invention is to provide an engine speed detection device, which can detect the speed quickly for engines of different models because the spatial position of the flywheel and the size of the flywheel are different, and thus the spatial position of the speed sensor detection point is also changing.

[0005] The present invention is implemented by the following technical scheme: a speed detection device for an engine, comprising a speed sensor and a detection member, the detection member is arranged on a flywheel of the engine, and comprises a seat ring and an inner ring, the inner ring is coaxially rotatably arranged in the seat ring, the speed sensor can be radially moved along the inner ring and is arranged on the inner ring, the seat ring is connected to the engine through a plurality of connecting members, and the flywheel is placed in the inner cavity of the inner ring;

[0006] A plurality of connecting members are arranged in an annular array on the seat ring, the connecting members include a first slide seat, a first slide rod and a pin, a long slide hole is radially opened on the seat ring, the first slide rod is suspended above the long slide hole, the upper end of the first slide seat is slidably sleeved on the first slide rod, and the lower end of the first slide seat is slidably placed in the long slide hole;

[0007] The pin is arranged at the bottom of the first slide seat, and a plurality of pin holes are arranged in a circular array on the engine, and a plurality of the pins are respectively placed in the plurality of the pin holes.

[0008] Furthermore, it also includes a driving seat, a driving rod and a driving member, wherein the long sliding hole is located at the inner and outer sides of the seat ring and is respectively provided with a first support and a second support, the first support is vertically provided with a first slide rail, the driving seat is slidably provided on the first slide rail, and the two ends of the driving rod are respectively hinged to the driving seat and the first slide seat;

[0009] The driving member is used to drive the driving seat to move on the first slide rail.

[0010] Furthermore, it also includes a first spring, which is sleeved on the first sliding rod, and two ends of the first spring are respectively in contact with the second support and the first sliding seat.

[0011] Furthermore, the driving member is arranged on the inner ring.

[0012] Further, the driving member includes a driving plate, a third support, a mounting plate and a second spring, the third support is arranged on the inner ring, a first groove is vertically opened on the portion of the first support located above the first slide bar, a second groove is vertically opened on the third support, and one end of the driving plate extends out of the second groove and the first groove and is located on the moving path of the driving seat;

[0013] The ends of the plurality of driving plates away from the driving seat are connected and fixed to each other;

[0014] The mounting plate is arranged parallel to and below the driving plate, one end of the mounting plate is connected to the third support, and the other ends of a plurality of the mounting plates are connected and fixed to each other;

[0015] A plurality of second springs are arranged at intervals between the driving plate and the mounting plate, and two ends of the plurality of second springs are connected to the driving plate and the mounting plate respectively.

[0016] Furthermore, a second slide seat is provided on the inner ring, a second slide rod is provided on the second slide seat to slide radially along the inner ring, and one end of the second slide rod located on the inner side of the inner ring passes through the second slide seat and is connected to the speed sensor;

[0017] A first limit seat is arranged at one end of the second slide bar away from the rotation speed sensor, a third spring is sleeved on the second slide bar, and two ends of the third spring are respectively in contact with the first limit seat and the second slide seat.

[0018] Furthermore, the seat ring is provided with an arc-shaped first limiting guide rail, the two ends of the first limiting guide rail are respectively connected to the inner and outer sides of the seat ring, and the two ends of the first limiting guide rail and the center of the seat ring are not on the same straight line;

[0019] The first limiting seat is slidably connected to the first limiting guide rail.

[0020] Furthermore, a self-locking ring is coaxially arranged on the seat ring, the self-locking ring is located between the first support and the third support, and the third spring is located above the self-locking ring;

[0021] A plurality of locking holes are arranged in an annular array on the self-locking ring, and a locking pin is arranged at the bottom of the driving plate. The locking pin moves out of or into the corresponding locking hole below the driving plate when the driving plate moves up and down.

[0022] Furthermore, a third slide seat is provided on the inner ring, a third slide rod is provided on the third slide seat to slide radially along the inner ring, and a pulley is provided after one end of the third slide rod located on the inner side of the inner ring passes through the third slide seat;

[0023] A second limit seat is arranged at one end of the third slide bar away from the pulley, a fourth spring is sleeved on the third slide bar, and two ends of the fourth spring are respectively in contact with the second limit seat and the third slide seat;

[0024] The seat ring is provided with an arc-shaped second limiting guide rail, the second limiting guide rail and the first limiting guide rail are symmetrically arranged about the center of the seat ring, the two ends of the second limiting guide rail are respectively connected to the inner and outer sides of the seat ring, and the two ends of the second limiting guide rail and the center of the seat ring are not on the same straight line;

[0025] The second limiting seat is slidably connected to the second limiting guide rail.

[0026] Furthermore, the distance between the end of the pulley and the center of the seat ring is greater than the distance between the end of the speed sensor and the center of the seat ring.

[0027] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0028] 1. Multiple drive plates move downward synchronously and drive the drive seat to move downward. The drive seat drives the first slide seat to move outward on the first slide rod through the drive rod, so that multiple pins can enter the corresponding pin holes; for pin holes with different spacings on flange end faces of different diameters of different engines, the pins can be inserted into the corresponding pin holes by adjusting the radial position of the pins on the seat ring, so that the seat ring and the flange end face are finally butted together.

[0029] 2. Under the action of the first spring, the pin exerts a force on the side wall of the pin hole. By increasing the friction coefficient of the contact surface, the pin is not easily detached from the pin hole, which can overcome the vibration of the engine during operation, so that the seat ring can be stably connected with the flange end face, and at the same time provide a good foundation for the subsequent detection work of the speed sensor.

[0030] 3. After multiple pins are respectively inserted into multiple pin holes and the seat ring and the flange end faces are aligned and level, the drive plate is lifted up to disengage the end of the drive plate from the first groove, but not from the second groove, and then the drive plate is rotated to abut against the side wall of the second groove, thereby driving the inner ring to rotate in the seat ring. At the same time, the inner ring drives the second slide bar and the speed sensor to rotate through the second slide seat, and the first limit seat slides on the first limit guide rail. At the same time, as the first limit guide rail gets closer and closer to the center of the seat ring, the second slide bar is forced to move to one side of the axis of the seat ring, thereby driving the speed sensor close to the flywheel until it reaches the predetermined position, and the detection component can be detected, which is convenient for the subsequent speed detection of the flywheel.

[0031] 4. In the initial state, the locking pin is inserted into the locking hole under the action of multiple second springs, and then in the initial state, the inner ring and the seat ring are locked with each other. When the inner ring needs to be rotated to adjust the detection position of the speed sensor, first lift the drive plate so that the end of the drive plate is aligned with the first groove and the locking pin is separated from the lock hole. After the speed sensor is rotated into place, press the drive plate down to insert the locking pin into the corresponding lock hole to lock the inner ring and the seat ring again, and fix the position of the speed sensor, which is convenient for subsequent speed detection of the flywheel.

[0032] 5. The movement mode of the pulley and the speed sensor is the same, except that the distance between the end of the pulley and the center of the seat ring is greater than the distance between the end of the speed sensor and the center of the seat ring. Therefore, after the pulley abuts the flywheel, the speed sensor is still a little short of abutting the flywheel. At this time, within the detection range of the speed sensor, the inner ring can be driven in reverse to rotate, so that the pulley retreats slightly and does not contact the flywheel. Of course, contact is also possible. Anyway, it is based on the premise of not affecting the normal movement of the flywheel and not affecting the rotation of the detection part when the detection part is set on the side wall of the flywheel, so as to ensure the normal detection of the speed sensor. Through the above operations, the position of the speed sensor and the detection part on the flywheel can be quickly adjusted without a lot of time for debugging, which greatly improves work efficiency and can be completed by one person. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of the structure of a rotation speed detection device for an engine provided by the present invention in cooperation with a flywheel;

[0035] Figure 2 for Figure 1 Structural schematic diagram of the cross section at AA;

[0036] Figure 3 for Figure 1 A magnified schematic diagram of the structure at B in the middle;

[0037] Figure 4 for Figure 2 A magnified schematic diagram of the structure at C in the middle;

[0038] Icons: 1. Speed ​​sensor, 11. Second slide seat, 12. Second slide rod, 13. First limit seat, 14. Third spring, 15. First limit guide rail, 2. Detection part, 3. Flywheel, 4. Seat ring, 41. Long slide hole, 5. Inner ring, 6. Connecting part, 61. First slide seat, 62. First slide rod, 63. Pin, 64. Drive seat, 65. Drive rod, 66. First support seat, 661. First slide rail, 662, first groove, 67, second support, 68, first spring, 7, driving member, 71, driving plate, 72, third support, 721, second groove, 73, mounting plate, 74, second spring, 8, self-locking ring, 81, locking hole, 82, locking pin, 9, pulley, 91, third slide seat, 92, third slide rod, 93, second limiting seat, 94, fourth spring, 95, second limiting guide rail, 10, pin hole. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Reference Figures 1 to 4 As shown, this embodiment provides a speed detection device for an engine, including a speed sensor 1 and a detection member 2. The detection member 2 is generally a magnetic conductive material. The detection member 2 is arranged on the flywheel 3 of the engine. As the flywheel 3 rotates, when the detection member 2 rotates one circle to the position of the speed sensor 1, the speed sensor 1 detects and records once. There are many specific types of speed sensors 1 and detection members 2, such as magnetic sensitive, laser, and magnetoelectric. For each rotation of the flywheel 3, the speed sensor 1 generates an electrical pulse signal, and the speed can be calculated from the number of pulses detected per unit time. At the same time, the number of detection members 2 can be set to multiple, and the more the number, the higher the speed accuracy obtained.

[0042] The engine speed RPM, revolutions per minute, is calculated by the following formula: speed=f×60 / N, where f is the pulse frequency and N is the number of detection elements 2 .

[0043] The detection device mainly includes a seat ring 4 and an inner ring 5. The inner ring 5 is coaxially rotatably arranged in the seat ring 4. The speed sensor 1 can be radially moved along the inner ring 5 and is arranged on the inner ring 5. After the seat ring 4 is connected to the engine through a number of connecting parts 6, the flywheel 3 is placed in the inner cavity of the inner ring 5. The seat ring 4 is mainly connected to the flange end surface connected to one side of the gearbox. By adjusting the speed sensor 1 to move radially on the inner ring 5, it can detect the detection parts 2 on the flywheels 3 with different diameters.

[0044] More specifically, Figures 1 to 4As shown, a plurality of connecting members 6 are arranged in a circular array on the seat ring 4, and the connecting members 6 include a first slide seat 61, a first slide rod 62 and a pin 63. A long slide hole 41 is radially opened on the seat ring 4, and the first slide rod 62 is suspended above the long slide hole 41. The upper end of the first slide seat 61 is slidably sleeved on the first slide rod 62, and the lower end of the first slide seat 61 is slidably placed in the long slide hole 41; the pin 63 is arranged at the bottom of the first slide seat 61, and a plurality of pin holes 10 are arranged in a circular array on the flange end face of the engine. A plurality of pins 63 are respectively placed in a plurality of pin holes 10 so that the seat ring 4 can be connected to the flange end face. Furthermore, by driving the first slide seat 61 to slide on the first slide rod 62, the pin 63 is driven to slide along the long slide hole 41, that is, to move radially along the seat ring 4. For pin holes 10 with different spacings on flange end faces of different diameters of different engines, the pin 63 can be inserted into the corresponding pin hole 10 by adjusting the radial position of the pin 63 on the seat ring 4, so that the seat ring 4 and the flange end face are finally butted together.

[0045] More specifically, Figures 1 to 4 As shown, it also includes a driving seat 64, a driving rod 65 and a driving member 7. The long sliding hole 41 is located on the inner and outer sides of the seat ring 4, and a first support 66 and a second support 67 are respectively provided. A first slide rail 661 is vertically provided on the first support 66. The driving seat 64 is slidably set on the first slide rail 661. The two ends of the driving rod 65 are respectively hinged to the driving seat 64 and the first slide seat 61. Two driving rods 65 can be used here, which are symmetrically arranged on both sides of the driving seat 64 and the first slide seat 61; the driving member 7 is used to drive the driving seat 64 to move on the first slide rail 661, and then drive the first slide seat 61 to move on the first slide rod 62 through the driving rod 65, and then drive the pin 63 to move radially on the seat ring 4.

[0046] When implementing it, Figures 1 to 4 As shown, it also includes a first spring 68, which is sleeved on the first slide rod 62, and the two ends of the first spring 68 are respectively in contact with the second support 67 and the first slide seat 61. In the initial state, the driving member 7 does not act on the driving seat 64. Under the action of the first spring 68, the first slide seat 61 is located on the inner side of the seat ring 4, that is, on the side of the long slide hole 41 close to the center of the seat ring 4. As the driving member 7 drives the driving seat 64 to move downward, the driving seat 64 drives the first slide seat 61 to move outward on the first slide rod 62 through the driving rod 65, thereby allowing multiple pins 63 to enter the corresponding pin holes 10. There are at least two pins 63 here. Under the action of the first spring 68, the pins 63 have a force on the side wall of the pin hole 10, and by increasing the friction coefficient of the contact surface, the pin 63 is not easy to disengage from the pin hole 10, which can overcome the vibration of the engine during operation, thereby enabling the seat ring 4 to stably dock with the flange end face, and at the same time provide a good foundation for the subsequent detection work of the speed sensor 1.

[0047] More specifically, Figures 1 to 4 As shown, the driving member 7 is arranged on the inner ring 5. The driving member 7 includes a driving plate 71, a third support 72, a mounting plate 73 and a second spring 74. The third support 72 is arranged on the inner ring 5. The first support 66 is provided with a first groove 662 vertically on the part above the first slide bar 62. The third support 72 is provided with a second groove 721 vertically. One end of the driving plate 71 extends the second groove 721 and the first groove 662 and is located on the moving path of the driving seat 64. The height of the second groove 721 extending upward is higher than the height of the first groove 662. In specific implementation, the ends of several driving plates 71 away from the driving seat 64 are connected and fixed to each other. At least two groups of driving members 7 are arranged here. By pressing down the driving plate 71, the multiple driving plates 71 are synchronously moved downward, and the driving seat 64 is driven to move downward, so as to synchronously adjust the positions of the multiple pins 63, so as to facilitate the rapid docking of the seat ring 4 with the flange end face.

[0048] like Figure 2 and Figure 4 As shown, the mounting plate 73 is arranged parallel to the lower side of the driving plate 71, one end of the mounting plate 73 is connected to the third support 72, and the other ends of the plurality of mounting plates 73 are connected and fixed to each other; a plurality of second springs 74 are arranged at intervals between the driving plate 71 and the mounting plate 73, and the two ends of the plurality of second springs 74 are connected to the driving plate 71 and the mounting plate 73, respectively. The second springs 74 are mainly used to limit the distance between the driving plate 71 and the mounting plate 73. When the driving plate 71 is pressed down, the plurality of second springs 74 are compressed. When no external force acts on the driving plate 71, the plurality of second springs 74 reset the driving plate 71. Similarly, when the driving plate 71 is lifted up, the plurality of second springs 74 are stretched. After the external force is removed, the plurality of second springs 74 can still drive the driving plate 71 to reset.

[0049] A second slide seat 11 is arranged on the inner ring 5, and a second slide rod 12 is arranged on the second slide seat 11 to slide radially along the inner ring 5. One end of the second slide rod 12 located on the inner side of the inner ring 5 passes through the second slide seat 11 and is connected to the speed sensor 1. In order to prevent the second slide rod 12 from rotating on the second slide seat 11, the second slide rod 12 can be spline-connected with the second slide seat 11, so that the speed sensor 1 will not rotate while moving with the second slide rod 12.

[0050] like Figure 1 As shown, a first limit seat 13 is provided at one end of the second slide bar 12 away from the speed sensor 1, and a third spring 14 is sleeved on the second slide bar 12. Both ends of the third spring 14 are respectively abutted against the first limit seat 13 and the second slide seat 11, so that in the original state, the speed sensor 1 is always in the initial position, that is, close to the inner ring 5, through the third spring 14.

[0051] More specifically, Figure 1As shown, an arc-shaped first limit guide rail 15 is provided on the seat ring 4, and the two ends of the first limit guide rail 15 are respectively connected to the inner and outer sides of the seat ring 4, and the two ends of the first limit guide rail 15 and the center of the seat ring 4 are not on the same straight line; the first limit seat 13 is slidably connected to the first limit guide rail 15. During specific implementation, after multiple pins 63 are respectively inserted into multiple pin holes 10 and the seat ring 4 is flattened with the flange end surface, the drive plate 71 is lifted up to make the end of the drive plate 71 disengage from the first groove 662, but not disengage from the second groove 721, and then the drive plate 71 is rotated to abut against the side wall of the second groove 721 through the drive plate 71, thereby driving the inner ring 5 to rotate in the seat ring 4. At the same time, the inner ring 5 drives the second slide bar 12 and the speed sensor 1 to rotate through the second slide seat 11, and the first limit seat 13 slides on the first limit guide rail 15. At the same time, as the first limit guide rail 15 gets closer and closer to the center of the seat ring 4, the second slide bar 12 is forced to move toward the axis of the seat ring 4, thereby driving the speed sensor 1 close to the flywheel 3 until it reaches the predetermined position, and the detection member 2 can be detected, which is convenient for the subsequent speed detection of the flywheel 3.

[0052] like Figures 1 to 4 As shown, a self-locking ring 8 is coaxially arranged on the seat ring 4, and the self-locking ring 8 is located between the first support 66 and the third support 72; a plurality of locking holes 81 are arranged in an annular array on the self-locking ring 8, and a locking pin 82 is arranged at the bottom of the driving plate 71, and the locking pin 82 is moved out of or into the corresponding locking hole 81 below it by the up and down movement of the driving plate 71; in specific implementation, in the initial state, the locking pin 82 is inserted into the locking hole 81 under the action of a plurality of second springs 74, and then in the initial state, the inner ring 5 and the seat ring 4 are locked with each other, when it is necessary to rotate the inner ring 5 to adjust the detection position of the speed sensor 1, the driving plate 71 is first lifted up, so that the end of the driving plate 71 is classified with the first groove 662, and the locking pin 82 is separated from the locking hole 81, and after the speed sensor 1 is rotated into place, the driving plate 71 is pressed down to insert the locking pin 82 into the corresponding locking hole 81, so that the inner ring 5 and the seat ring 4 can be locked again, and the position of the speed sensor 1 is fixed, which is convenient for the subsequent speed detection of the flywheel 3.

[0053] More specifically, Figure 1 As shown, a third slide seat 91 is arranged on the inner ring 5, and the third slide seat 91 and the second slide seat 11 are symmetrically arranged about the center of the inner ring 5. A third slide rod 92 is arranged on the third slide seat 91 to slide radially along the inner ring 5. The end of the third slide rod 92 located on the inner side of the inner ring 5 passes through the third slide seat 91 and is provided with a pulley 9. The third slide rod 92 and the third slide seat 91 are also spline-connected, thereby ensuring that the pulley 9 does not rotate and can roll against the flywheel 3 when the flywheel 3 rotates.

[0054] A second limit seat 93 is disposed at one end of the third slide bar 92 away from the pulley 9, and a fourth spring 94 is sleeved on the third slide bar 92, and two ends of the fourth spring 94 are respectively in contact with the second limit seat 93 and the third slide seat 91;

[0055] like Figure 1 As shown, an arc-shaped second limit guide rail 95 is provided on the seat ring 4, and the second limit guide rail 95 and the first limit guide rail 15 are symmetrically arranged about the center of the seat ring 4, and the two ends of the second limit guide rail 95 are respectively connected to the inner and outer sides of the seat ring 4, and the two ends of the second limit guide rail 95 and the center of the seat ring 4 are not on the same straight line; the second limit seat 93 is slidably connected to the second limit guide rail 95.

[0056] When implementing it, Figure 1 As shown, the movement mode of the pulley 9 is consistent with that of the speed sensor 1, except that the distance between the end of the pulley 9 and the center of the seat ring 4 is greater than the distance between the end of the speed sensor 1 and the center of the seat ring 4. Therefore, after the pulley 9 abuts against the flywheel 3, the speed sensor 1 is still a little short of abutting against the flywheel 3. At this time, within the detection range of the speed sensor 1, the inner ring 5 can be driven in reverse to rotate, so that the pulley 9 retreats slightly and does not contact the flywheel 3. Of course, contact is also possible. Anyway, it is based on the premise of not affecting the normal movement of the flywheel 3 and not affecting the rotation of the detection member 2 when the detection member 2 is set on the side wall of the flywheel 3, so as to ensure the normal detection of the speed sensor 1. Through the above operation, the position of the speed sensor 1 and the detection member 2 on the flywheel 3 can be quickly adjusted without a lot of time for debugging, which greatly improves the work efficiency and can be completed by one person.

[0057] like Figures 1 to 4 As shown, after the detection is completed, the driving plate 71 is lifted up to separate the locking pin 82 from the locking hole 81. Under the action of the third spring 14 and the fourth spring 94, the second slide bar 12 and the third slide bar 92 are forced to move outward, thereby driving the inner ring 5 to reset. Of course, the inner ring 5 can also be reset by human power. After the driving plate 71 is aligned with the first groove 662, the driving plate 71 is pressed down to first insert the locking pin 82 into the locking hole 81, and then the pin 63 is slightly moved outward to reduce the friction between the pin 63 and the pin hole 10. Then, the fingers hold the mounting plate 73 and the entire device is pulled outward to make the pin 63 withdraw from the pin hole 10. The entire device is very simple and convenient to connect and disassemble with the flange end face of the engine, and the installation position is accurate and can be quickly coaxial with the flywheel 3. At the same time, the position adjustment of the speed sensor 1 and the detection member 2 on the flywheel 3 is also convenient and quick, and can be completed by one person, which saves manpower and material resources while greatly improving the detection efficiency.

[0058] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotation speed detection device for an engine, comprising a rotation speed sensor (1) and a detection member (2), wherein the detection member (2) is arranged on a flywheel (3) of the engine, and characterized in that: It comprises a seat ring (4) and an inner ring (5), wherein the inner ring (5) is coaxially rotatably arranged in the seat ring (4), the rotation speed sensor (1) is arranged on the inner ring (5) so as to be movable radially along the inner ring (5), and after the seat ring (4) is docked with the engine via a plurality of connecting pieces (6), the flywheel (3) is placed in the inner cavity of the inner ring (5); A plurality of connecting members (6) are arranged in an annular array on the seat ring (4), the connecting members (6) comprising a first sliding seat (61), a first sliding rod (62) and a pin (63), a long sliding hole (41) is radially opened on the seat ring (4), the first sliding rod (62) is suspended above the long sliding hole (41), the upper end of the first sliding seat (61) is slidably sleeved on the first sliding rod (62), and the lower end of the first sliding seat (61) is slidably placed in the long sliding hole (41); The pin (63) is arranged at the bottom of the first slide seat (61), a plurality of pin holes (10) are arranged in a circular array on the engine, and a plurality of the pins (63) are respectively placed in a plurality of the pin holes (10).

2. The engine speed detection device according to claim 1, characterized in that: It also includes a driving seat (64), a driving rod (65) and a driving member (7); the long sliding hole (41) is located at the inner and outer sides of the seat ring (4), and a first support (66) and a second support (67) are respectively provided; a first slide rail (661) is vertically provided on the first support (66); the driving seat (64) is slidably provided on the first slide rail (661); and the two ends of the driving rod (65) are respectively hinged to the driving seat (64) and the first slide seat (61); The driving member (7) is used to drive the driving seat (64) to move on the first slide rail (661).

3. The engine speed detection device according to claim 2, characterized in that: It also includes a first spring (68), which is sleeved on the first slide bar (62), and the two ends of the first spring (68) are respectively in contact with the second support (67) and the first slide seat (61).

4. The engine speed detection device according to claim 3, characterized in that: The driving member (7) is arranged on the inner ring (5).

5. The engine speed detection device according to claim 4, characterized in that: The driving member (7) comprises a driving plate (71), a third support (72), a mounting plate (73) and a second spring (74); the third support (72) is arranged on the inner ring (5); a first groove (662) is vertically provided on a portion of the first support (66) located above the first slide bar (62); a second groove (721) is vertically provided on the third support (72); one end of the driving plate (71) extends out of the second groove (721) and the first groove (662) and is located on a moving path of the driving seat (64); The ends of the plurality of drive plates (71) away from the drive seat (64) are connected and fixed to each other; The mounting plate (73) is arranged parallel to the bottom of the driving plate (71), one end of the mounting plate (73) is connected to the third support (72), and the other ends of a plurality of the mounting plates (73) are connected and fixed to each other; A plurality of second springs (74) are arranged at intervals between the driving plate (71) and the mounting plate (73), and two ends of the plurality of second springs (74) are respectively connected to the driving plate (71) and the mounting plate (73).

6. The engine speed detection device according to claim 5, characterized in that: A second slide seat (11) is arranged on the inner ring (5), a second slide rod (12) is arranged on the second slide seat (11) to slide radially along the inner ring (5), and one end of the second slide rod (12) located on the inner side of the inner ring (5) passes through the second slide seat (11) and is connected to the speed sensor (1); A first limit seat (13) is arranged at one end of the second slide bar (12) away from the rotation speed sensor (1), and a third spring (14) is sleeved on the second slide bar (12), and two ends of the third spring (14) are respectively in contact with the first limit seat (13) and the second slide seat (11).

7. The engine speed detection device according to claim 6, characterized in that: The seat ring (4) is provided with an arc-shaped first limiting guide rail (15), the two ends of the first limiting guide rail (15) are respectively connected to the inner and outer sides of the seat ring (4), and the two ends of the first limiting guide rail (15) and the center of the seat ring (4) are not on the same straight line; The first limiting seat (13) is slidably connected to the first limiting guide rail (15).

8. The engine speed detection device according to claim 7, characterized in that: A self-locking ring (8) is coaxially arranged on the seat ring (4), the self-locking ring (8) is located between the first support (66) and the third support (72), and the third spring (14) is located above the self-locking ring (8); A plurality of locking holes (81) are arranged in an annular array on the self-locking ring (8), and a locking pin (82) is arranged at the bottom of the driving plate (71). The locking pin (82) moves out of or into the corresponding locking hole (81) below the driving plate (71) as the driving plate (71) moves up and down.

9. The engine speed detection device according to claim 8, characterized in that: A third slide seat (91) is arranged on the inner ring (5), a third slide rod (92) is arranged on the third slide seat (91) to slide radially along the inner ring (5), and a pulley (9) is arranged on one end of the third slide rod (92) located on the inner side of the inner ring (5) and passing through the third slide seat (91); A second limit seat (93) is arranged at one end of the third slide bar (92) away from the pulley (9), a fourth spring (94) is sleeved on the third slide bar (92), and two ends of the fourth spring (94) are respectively in contact with the second limit seat (93) and the third slide seat (91); The seat ring (4) is provided with an arc-shaped second limiting guide rail (95), the second limiting guide rail (95) and the first limiting guide rail (15) are symmetrically arranged about the center of the seat ring (4), the two ends of the second limiting guide rail (95) are respectively connected to the inner and outer sides of the seat ring (4), and the two ends of the second limiting guide rail (95) and the center of the seat ring (4) are not on the same straight line; The second limiting seat (93) is slidably connected to the second limiting guide rail (95).

10. The engine speed detection device according to claim 9, characterized in that: The distance between the end of the pulley (9) and the center of the seat ring (4) is greater than the distance between the end of the rotation speed sensor (1) and the center of the seat ring (4).

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