Novel gearbox switch structure

Abstract

The utility model belongs to the technical field of gearbox switches, and discloses a novel gearbox switch structure which comprises an ejector rod assembly, a shell and a socket opening and closing piece, the ejector rod assembly is inserted into the shell and penetrates out of one end of the shell, and the two ends of the socket opening and closing piece are provided with an insertion cavity and a sliding cavity respectively. According to the utility model, the original waveform sealing ring structure has the advantages of good sealing performance, normally-closed and normally-open conversion and extremely strong part universality, the contacts of the movable contact sheet slide on the copper columns in the whole course and do not pass through other insulating materials such as plastics, and the sealing performance of the movable contact sheet is greatly improved. Compared with a traditional brush piece type structure, the movable contact piece has the advantages that the load capacity is greatly improved, the movable contact piece is of a clamping jaw structure, double insurance is achieved on the two sides, the contact reliability of the switch is greatly improved, the manufacturability is high, full-automatic production can be achieved, and economic benefits are good.

Description

Technical Field

[0001] The utility model relates to the technical field of gearbox switches, and particularly relates to a novel gearbox switch structure. Background Art

[0002] A gearbox is a mechanism used to change the speed and torque from the engine, enabling the vehicle to move forward, backward or idle. Each gear state requires a highly reliable switch signal for monitoring and transmitting the state signal to the engine controller (ECU) to execute corresponding instructions. The gearbox is adjacent to the engine, and the surrounding environment here is extremely harsh, such as high temperature, oil pollution, vibration, wading, etc., which poses a severe test to the reliability of the signal switch. At present, the failure rates of various gearbox switches on the market, especially those for commercial vehicles, are very high and the reliability is poor. The main failure phenomena are as follows:

[0003] 1. Seal failure, with oil or water entering inside, affecting the contact reliability of the switch;

[0004] 2. Poor contact of the contacts. Over time, the switch contacts are inevitably subject to arcing and oxidation problems, and the accumulated arcing oxides affect the contact reliability of the switch;

[0005] 3. Poor on-off stroke, rapid wear of the contacts, directly affecting the on-off trigger stroke of the switch.

[0006] In summary, in the current market, there is an urgent need for a highly reliable gearbox switch, and this invention patent has emerged as the times require. Content of the Utility Model

[0007] The purpose of the utility model is to provide a novel gearbox switch structure, aiming to solve the above-mentioned technical problems existing in the prior art.

[0008] To achieve the above purpose, the utility model adopts the following technical solutions:

[0009] The top of described sliding panel also is provided with an inserting hole, and the bottom of described sliding panel also is provided with an inserting hole, and the inserting hole is fixed with the middle part of described sliding panel, and the bottom of described sliding panel is connected with the inserting hole of described sliding panel.

[0010] The upper part of the conductive copper pillar is a square columnar structure, and the lower part is a cylindrical structure. The square columnar structure penetrates the sliding cavity, and its surface is inlaid with insulating protrusions. The opposite sides of the top of the insulating protrusion are set as inclined surfaces, and the middle is hollowed out to expose part of the conductive copper pillar. The two contact ears that are tightly attached to each other are stretched open by the insulating protrusion and tightly attached to the corresponding surface of the conductive copper pillar.

[0011] In a preferred embodiment of the present invention, a clamping cylinder is integrally formed in the middle of the corrugated sealing ring, a pressure column is inserted into the clamping cylinder, the pressure column and the clamping cylinder are inserted into the plug hole together, the tail of the pressure column is fixed to the plug hole by ultrasonic welding, and one end of the push rod assembly is tightly attached to one end of the pressure column.

[0012] In a preferred embodiment of the present invention, the plug-in hole extends toward the interior of the slider to form a hole wall column, a mounting groove is provided in the center of the bottom of the inner wall of the sliding cavity, a guide column is fixedly connected to the inner center of the mounting groove, and the two ends of the reset spring are respectively plugged into the hole wall column and the guide column.

[0013] In a preferred embodiment of the present invention, the surface of the insulating protrusion has a stepped structure, which decreases from top to bottom, with its maximum thickness being greater than the thickness of the square columnar structure and its minimum thickness being less than the thickness of the square columnar structure.

[0014] In a preferred embodiment of the present invention, the surface of the insulating protrusion has a stepped structure, which increases from top to bottom, with a maximum thickness greater than the thickness of the square columnar structure and a minimum thickness less than the thickness of the square columnar structure.

[0015] In a preferred embodiment of the present invention, the push rod assembly includes a metal push rod, a telescopic spring, a gasket and a copper sleeve. The gasket is sleeved on the outside of the metal push rod. The copper sleeve is turned inward to clamp the metal push rod and the gasket inside. A telescopic spring is provided inside the metal push rod, and the two ends of the telescopic spring respectively contact the metal push rod and the copper sleeve.

[0016] In a preferred embodiment of the present invention, an O-ring is provided between the surface of the shell and the inner surface of the socket separation and assembly part and near the riveted joint.

[0017] The beneficial effects of the utility model are:

[0018] The utility model is characterized by its original corrugated sealing ring structure with good sealing performance, reasonable layout, ingenious design, normally closed and normally open conversion, and strong parts versatility. The contacts of the moving contact piece slide on the copper column throughout the entire process without passing through other insulating materials such as plastic, which greatly reduces the contamination of the contacts. The sliding contacts avoid the accumulation of arc carbides. At the same time, the load capacity of the moving contact piece is greatly improved compared with the traditional brush-type structure. The moving contact piece is a clamping claw structure with double insurance on both sides, which greatly improves the reliability of the switch contact, has strong processability, can be fully automatically produced, and has good economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the full cross-sectional structure of structure A of the present utility model;

[0020] Figure 2 This is a schematic diagram of the full cross-sectional structure of structure B of the present utility model;

[0021] Figure 3 This is a schematic diagram of the three-dimensional explosion structure of the utility model;

[0022] Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the normally open type of the utility model;

[0023] Figure 5 It is a schematic diagram of the three-dimensional cross-sectional structure of the normally closed type of the utility model.

[0024] Figure numerals; among them, 1, push rod assembly; 101, metal push rod; 102, telescopic spring; 103, gasket; 104, copper sleeve; 2, outer shell; 3, corrugated sealing ring; 301, clamping cylinder; 4, O-ring; 5, socket separation and assembly part; 501, insulating protrusion; 502, guide column; 503, mounting groove; 504, plug-in cavity; 505, sliding cavity; 6, pressure column; 7, slider; 701, plug-in hole; 702, hole wall column; 8, moving spring; 801, contact ear; 9, reset spring; 10, conductive copper column. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the present invention in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structures of the drawings is only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings. It should be noted here that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0026] Embodiment:

[0027] As Figures 1-5 shown, this embodiment provides a novel gearbox switch structure, including a push rod assembly 1, a housing 2 and a socket separating and combining member 5. The push rod assembly 1 is inserted into the housing 2 and penetrates from one end. The two ends of the socket separating and combining member 5 are respectively provided with a plugging cavity 504 and a sliding cavity 505. Two conducting copper columns 10 are buried side by side inside the plugging cavity 504. The housing 2 is riveted or spin-riveted to the socket separating and combining member 5. A slider 7 is movably connected inside the sliding cavity 505. A plugging hole 701 is provided in the center of the top of the sliding cavity 505. The middle part of a corrugated sealing ring 3 is inserted into the plugging hole 701. The edges around the corrugated sealing ring 3 are clamped with the edges around the socket separating and combining member 5 and are tightly fixed to the inner wall of the housing 2. One end of the push rod assembly 1 is closely attached to the middle part of the corrugated sealing ring 3. A return spring 9 is fixedly connected between the center of the inner wall of the top of the slider 7 and the center of the inner wall of the bottom of the sliding cavity 505. A moving reed 8 is fixedly installed inside the slider 7. Contact ears 801 are integrally formed at the four corner positions at the bottom of the moving reed 8. The two contact ears 801 on the same side are closely attached to each other;

[0028] The upper part of the conducting copper column 10 is in a square columnar structure, and the lower part is in a cylindrical structure. The square columnar structure penetrates into the sliding cavity 505. An insulating protrusion 501 is embedded on its surface. The opposite sides of the top of the insulating protrusion 501 are both set as inclined surfaces, and the middle part is hollowed out to expose part of the conducting copper column 10. The two mutually attached contact ears 801 are separated by the insulating protrusion 501 and are closely attached to the surface of the corresponding conducting copper column 10.

[0029] In a preferred embodiment of the present invention, further, a clamping cylinder body 301 is integrally formed in the middle of the corrugated sealing ring 3. A pressing column 6 is inserted into the clamping cylinder body 301. The pressing column 6 and the clamping cylinder body 301 are together inserted into the plugging hole 701. The tail of the pressing column 6 is fixed to the plugging hole 701 by ultrasonic welding. One end of the push rod assembly 1 is closely attached to one end of the pressing column 6.

[0030] In a preferred embodiment of the present utility model, further, the insertion hole 701 extends into the slider 7 to form a hole wall cylinder 702. A mounting groove 503 is provided at the center of the inner bottom wall of the sliding cavity 505. A guide post 502 is fixedly connected to the center of the inside of the mounting groove 503. The two ends of the return spring 9 are respectively inserted into the hole wall cylinder 702 and the guide post 502.

[0031] Specifically, this switch is divided into Structure A and Structure B as shown in Figure 1 、 2 . The main difference lies in the sealing structure inside the switch.

[0032] The sealing core of A is the closed corrugated sealing ring 3 without a hole in the middle. This sealing ring adopts the material forming process of rubberized fabric, which improves its comprehensive performance, especially the stress and wear resistance. Compared with Structure A, this structure is relatively simple, but there will be a certain deformation when the elastic rubber is compressed (the metal ejector rod 101 and the slider 7 squeeze the corrugated sealing ring 3 under the action of the spring). If the deformation in the middle is too large, it will affect the on-off stroke of the switch and needs to be well controlled;

[0033] The sealing core of Structure B is the annular corrugated sealing ring 3 with a through hole with a lip and a clamping cylinder body 301 in the middle. The ejector post 6 passes through the clamping cylinder body 301 and is sleeved on the slider 7. The lip of the sealing ring is tightly compressed to form a central seal. An ultrasonic welding wire structure is designed between the ejector post 6 and the slider 7, which can weld and fix the ejector post 6, the annular corrugated sealing ring 3 and the slider 7 into an integral sub-assembly, facilitating subsequent assembly. This structure realizes flexible sealing. The displacement stroke of the ejector rod is transmitted through the deformation amount of the corrugated sealing ring 3 to realize the on-off signal of the switch. The biggest advantage of Structure B is that the pressure on the ejector rod assembly 1 does not directly act on the sealing ring, but is directly transmitted to the slider 7 through the ejector post 6, avoiding the risk of extrusion damage to the sealing ring and the influence of compression deformation on the stroke. Structure A and Structure B each have their own advantages.

[0034] The common parts and assembly relationships of each structure are as follows:

[0035] Assembly of the ejector rod assembly 1: The copper sleeve 104 is flanged, and the pre-inserted metal ejector rod 101, spring, and gasket 103 are riveted into a sub-assembly. In this sub-assembly state, the metal ejector rod 101 has a large pre-pressure;

[0036] The socket separation and combination part 5 is integrally formed by injection molding with two conducting copper columns 10 buried. One end of the conducting copper column 10 is cylindrical, which is the standard size of the connector, and the other end is square-column shaped. The side of the square column is partially plastic-coated, and the conducting copper column 10 is partially exposed to provide the conduction or disconnection area for the moving reed 8;

[0037] It should be particularly emphasized that the plastic coating of the square conductive copper column 10 is not the conventional co-planar and flush plastic coating of two materials. If it were, the wear resistance of the two materials would be different when the moving reed 8 slides on its surface, and pits and steps would form at the joint, accelerating the wear of the moving contact piece. That is, the contact ear 801 that realizes fitting by friction between the side part of the contact ear 801 and the insulating protrusion 501, and the plastic particles worn off directly get mixed into the contact point of the moving contact piece, resulting in poor insulation contact. This is a problem that many switches on the market encounter;

[0038] Looking at a single conductive copper column 10 alone, the square conductive copper column 10 (conductive area) is in the middle, with plastic protrusions on both sides, and it is transitioned through an inclined plane step. The corresponding moving contact piece is designed with two relatively wide contact ears 801. When sliding, the plastic inclined planes on both sides lift the contact ears 801 of the moving contact piece to achieve conduction or disconnection. The contact ears 801 are on both sides and the conductive area is in the middle, avoiding the influence of insulating wear impurities on conduction and disconnection. This is very important;

[0039] The plastic on the inclined planes on both sides is made into inserts on the mold, and local displacement can achieve normally closed or normally open of the switch, with extremely strong versatility.

[0040] The moving contact piece has been introduced above. It is the bridge connecting the two conductive copper columns 10. The moving contact piece is installed in the slider 7. There are four guiding ribs on the outside of the slider 7 that cooperate with the four guiding grooves of the socket separating and combining part 5 to achieve axial linear movement. The return spring 9 is sleeved into the column of the slider 7 and presses against the moving contact piece.

[0041] The operation principle of this switch is as follows: Since the spring force of the metal ejector rod 101 is much greater than the spring force of the return spring 9 of the slider 7, when the metal ejector rod 101 is pressed down, the internal return spring 9 will be compressed first, the corrugated sealing ring 3 deforms, and the slider 7 drives the moving contact piece to displace and contact or disconnect from the conductive copper column 10 to achieve the on-off of the switch. When the metal ejector rod 101 continues to be pressed down, after the bottom of the slider 7 is limited by the socket separating and combining part 5, the ejector rod spring starts to be compressed, realizing the over-travel of the metal ejector rod 101. The over-travel structure reduces the friction travel of the moving contact piece, reduces the deformation amount of the corrugated sealing ring 3, and reduces the axial space of the switch.

[0042] In a preferred embodiment of the present invention, further, the surface of the insulating protrusion 501 has a stepped structure, which gradually decreases from top to bottom. Its maximum thickness is greater than the thickness of the square columnar structure, and its minimum thickness is less than the thickness of the square columnar structure. Specifically, as Figure 3As shown, by setting the opposite sides of the top of the insulating protrusion 501 as inclined surfaces, when the mutually close contact ears 801 move downward to contact the top of the insulating protrusion 501, they will open due to the guidance of the inclined surfaces. At this time, the thickness of the insulating protrusion 501 is greater than that of the conduction copper column 10. At this time, the moving contact piece is not in contact with the conduction copper column 10, and the switch is in an open state at this time. By pressing the ejector rod assembly 1 to drive the slider 7 to continue to displace, the moving contact piece continues to slide along the insulating protrusion 501, and when it moves to a position where the thickness of the insulating protrusion 501 is less than the thickness of the conduction copper column 10, the contact ear 801 is in close contact with the conduction copper column 10 to achieve conduction.

[0043] In a preferred embodiment of the present invention, further, the surface of the insulating protrusion 501 has a stepped structure, which increases sequentially from top to bottom. Its maximum thickness is greater than the thickness of the square columnar structure, and its minimum thickness is less than the thickness of the square columnar structure. Specifically, as Figure 4 shown, by setting the opposite sides of the top of the insulating protrusion 501 as inclined surfaces, when the mutually close contact ears 801 move downward to contact the top of the insulating protrusion 501, they will open due to the guidance of the inclined surfaces. At this time, the thickness of the insulating protrusion 501 is less than the thickness of the conduction copper column 10. At this time, the moving contact piece is in contact with the conduction copper column 10, and the switch is in an open state at this time. By pressing the ejector rod assembly 1 to drive the slider 7 to continue to displace, the moving contact piece continues to slide along the insulating protrusion 501, and when it moves to a position where the thickness of the insulating protrusion 501 is greater than the thickness of the conduction copper column 10, the contact ear 801 is in close contact with the conduction copper column 10 to achieve disconnection.

[0044] Therefore, by installing different styles of insulating protrusions 501 during the production process, the normally open and normally closed functions of the switch are realized.

[0045] In a preferred embodiment of the present invention, further, the ejector rod assembly 1 includes a metal ejector rod 101, a telescopic spring 102, a gasket 103, and a copper sleeve 104. The gasket 103 is sleeved outside the metal ejector rod 101, and the copper sleeve 104 is caulked inside to hold the metal ejector rod 101 and the gasket 103 inside. A telescopic spring 102 is arranged inside the metal ejector rod 101, and both ends of the telescopic spring 102 are in contact with the metal ejector rod 101 and the copper sleeve 104 respectively.

[0046] In a preferred embodiment of the present invention, further, an O-ring seal 4 is provided between the surface of the housing 2 and the inner surface of the socket separating and combining member 5 and near the riveting position.

[0047] [[ID=

Claims

1. A new type of gearbox switch structure, comprising a push rod assembly (1), a housing (2) and a socket separating and combining part (5). The push rod assembly (1) is inserted into the housing (2) and penetrates out from one end. Both ends of the socket separating and combining part (5) are respectively provided with a plugging cavity (504) and a sliding cavity (505). Two conducting copper posts (10) are embedded side by side inside the plugging cavity (504). The housing (2) is riveted or spin-riveted to the socket separating and combining part (5), and is characterized in that, A slider (7) is movably connected within the sliding cavity (505). A plugging hole (701) is provided at the center of the top of the sliding cavity (505). The middle part of a corrugated sealing ring (3) is plugged into the plugging hole (701). The edges around the corrugated sealing ring (3) are clamped with the edges around the socket separating and combining part (5) and are tightly fixed against the inner wall of the outer shell (2). One end of the ejector rod assembly (1) is closely attached to the middle part of the corrugated sealing ring (3). A return spring (9) is fixedly connected between the center of the inner wall at the top of the slider (7) and the center of the inner wall at the bottom of the sliding cavity (505). A moving reed (8) is fixedly installed inside the slider (7). Contact ears (801) are integrally formed at the four corner positions of the bottom of the moving reed (8), and the two contact ears (801) on the same side are closely attached to each other. The upper part of the conducting copper column (10) has a square columnar structure, and the lower part has a cylindrical structure. The square columnar structure penetrates into the sliding cavity (505), and insulating protrusions (501) are inlaid on its surface. The opposite sides of the top of the insulating protrusion (501) are both arranged as inclined surfaces, and the middle part is hollowed out to expose part of the conducting copper column (10). The two mutually attached contact ears (801) are separated by the insulating protrusion (501) and are closely attached to the surface of the corresponding conducting copper column (10).

2. The novel gearbox switch structure according to claim 1, characterized in that, A clamping cylinder body (301) is integrally formed in the middle part of the corrugated sealing ring (3). A pressing column (6) is plugged into the clamping cylinder body (301). The pressing column (6) and the clamping cylinder body (301) are both inserted into the plugging hole (701). The tail of the pressing column (6) is fixedly connected to the plugging hole (701) by ultrasonic welding. One end of the ejector rod assembly (1) is closely attached to one end of the pressing column (6).

3. The novel gearbox switch structure according to claim 2, characterized in that, The plugging hole (701) extends into the slider (7) to form a hole wall cylinder (702). An installation groove (503) is provided at the center of the inner wall at the bottom of the sliding cavity (505). A guiding column (502) is fixedly connected to the center inside the installation groove (503). The two ends of the return spring (9) are respectively plugged into the hole wall cylinder (702) and the guiding column (502).

4. The novel gearbox switch structure according to claim 3, characterized in that, The surface of the insulating protrusion (501) has a stepped structure, which gradually decreases from top to bottom. Its maximum thickness is greater than the thickness of the square columnar structure, and its minimum thickness is less than the thickness of the square columnar structure.

5. The novel gearbox switch structure according to claim 3, characterized in that, The surface of the insulating protrusion (501) has a stepped structure, which gradually increases from top to bottom. Its maximum thickness is greater than the thickness of the square columnar structure, and its minimum thickness is less than the thickness of the square columnar structure.

6. The novel gearbox switch structure according to claim 1, characterized in that, The ejector rod assembly (1) includes a metal ejector rod (101), a telescopic spring (102), a gasket (103) and a copper sleeve (104). The gasket (103) is sleeved outside the metal ejector rod (101). The copper sleeve (104) internally clamps the metal ejector rod (101) and the gasket (103) by inward turning. A telescopic spring (102) is arranged inside the metal ejector rod (101), and both ends of the telescopic spring (102) are in contact with the metal ejector rod (101) and the copper sleeve (104) respectively.

7. The novel gearbox switch structure according to claim 6, characterized in that, An O-ring seal (4) is provided between the surface of the outer shell (2) and the inner surface of the socket separating and combining member (5) and near the riveting position.

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