Wave disc for magnetic clutch

Abstract

The present invention relates to a wave disc for a magnetic clutch, and more specifically to a disc inside a magnetic clutch that controls the connection status when transmitting rotational power of a motor to a hydraulic pump for the operation of a winch and crane of an Army rescue armored vehicle. Among a fixed disc and a movable disc, the fixed disc is improved from a flat shape to a wave shape and manufactured from high-strength carbon steel, thereby enabling improved durability compared to a conventional flat fixed disc, as well as reduced heat generation in the magnetic clutch and increased flow rate of the hydraulic pump.

Description

Technology Field

[0001] The present invention relates to a wave disc for a magnetic clutch that improves the shape of a fixed disc among the discs of a magnetic clutch that controls whether or not engine power is transmitted to a hydraulic pump, so that the hydraulic pump for operating a winch and crane of an army rescue armored vehicle can provide stable hydraulic pressure, thereby reducing heat generation and increasing flow rate. Background Technology

[0002] The winch and crane of the Army recovery armored vehicle are recovery devices that can be used to tow equipment that is difficult to escape under its own power when the vehicle gets stuck in mud, snow, or a ditch while crossing a river.

[0003] Looking at the operating principle and structure of the magnetic pump clutch used in these army recovery armored vehicles, it operates when current is applied to the magnetic assembly, and the main components are of a disc structure.

[0004] 1. Operating Principle: Current Application

[0005] Operation method: When the rated current (24V DC) is supplied to the electromagnet coil (field) of the magnetic clutch, the coil becomes magnetized and forms a strong magnetic field.

[0006] Combination: This magnetic field attracts the fixed disk and the movable disk, bringing them into complete contact with the plate assembly.

[0007] Power transmission: As the movable disc and the fixed disc come into close contact with the plate assembly, which is continuously rotating by the engine, rotational power is transmitted to the pump, causing the pump to operate.

[0008] Release: When the current is cut off and the magnetic field of the coil disappears, the movable disc falls due to the restoring force of the fixed disc, separating the engine shaft and the pump shaft, and the pump rotation stops.

[0009] 2. Components of a Magnetic Clutch (Fixed Disc and Floating Disc)

[0010] The key is the close contact / separation of the two discs.

[0011] Fixed Disc

[0012] It is connected to the engine-side plate assembly and rotates by being coupled to the drive unit through a spline or internal gear structure. When no current is applied, it rotates independently while separated from the flow disc.

[0013] Movable Disc

[0014] It is coupled to the pump shaft side housing and is connected to the pump through an outer groove or coupling structure.

[0015] When current is applied, it comes into close contact with the fixed disc by magnetic force, and at this time, the rotational force of the engine is transmitted to the pump.

[0016] In conclusion, the structure is such that when current is applied to the magnetic clutch (pump clutch) coil to generate magnetic force, the movable disc adheres to the fixed disc, connecting the power and operating the pump.

[0017] When operating the winch and crane of an Army rescue armored vehicle, stable hydraulic pressure must be supplied to ensure accurate equipment towing and surrounding stability.

[0018] However, since the discs of conventional magnetic clutches consist of both fixed and movable discs in a flat form, they cannot guarantee a stable discharge rate. Furthermore, as the flat movable disc engages with the flat fixed disc, the large contact surface area leads to issues regarding equipment durability and heat generation.

[0019] Consequently, there is an urgent need for the development of a device capable of solving these problems. Prior art literature

[0020] Published Patent Application No. 10-2018-0096225 (Published Aug. 29, 2018) Registered Patent Application No. 10-1237402 (Registered Feb. 20, 2013) The problem to be solved

[0021] The present invention was devised to solve the above-mentioned problems, and the objective of the present invention is to provide a wave disc for a clutch that forms waves at four locations on the outer edge of a fixed disc among a planar flow disc (without internal spline) and a planar fixed disc (with internal spline) that operate in a magnetic pump clutch.

[0022] When the magnetic field is energized and the above wave shape operates, it comes into close contact with the flow disc to form a shape similar to an impeller, thereby forming a high flow path shape, and can generate flow more quickly and stably compared to conventional flat fixed discs.

[0023] In addition, it is manufactured of high-strength carbon steel to maintain a stable flow rate even with repetitive magnetic operation, and

[0024] The invention provides a wave disc for a magnetic clutch that improves the ON / OFF switching responsiveness of the magnetic clutch by having the wave shape of the fixed disc act as an elastic restoring spring when switching from magnetic operation to non-operation, reduces frictional heat inside the magnetic clutch by reducing the contact surface between the discs compared to a conventional flat structure, and assists in stable shaft rotation due to the constant shape of the wave.

[0025] Other objects and advantages of the present invention will be described below and will be known from the embodiments of the present invention. Additionally, the objects and advantages of the present invention may be realized by means and combinations set forth in the claims. means of solving the problem

[0026] The present invention is a means for solving the above-mentioned problems,

[0027] When driving a hydraulic pump (300) with the rotational power of an engine (200) to operate a winch and crane installed on an army rescue armored vehicle, thereby generating hydraulic pressure necessary for operating the winch and crane,

[0028] In a magnetic clutch (100) that controls power transmission ON / OFF by magnetic operation, so that the fixed disc (10) and the movable disc (20) are detached to transmit the rotational power of the above engine (200) to the hydraulic pump (300),

[0029] By forming wave points (12) at four outer locations of a fixed disk (10) that is connected to and rotated with the engine (200), so that the fixed disk (10) is configured in a wave shape that ripples along its circumferential surface,

[0030] Even when the movable disc (20) makes corresponding contact with the fixed disc (10) for the operation of the above winch and crane, the entire surface of the two is not in contact in a flat manner, and a locally lifted clearance is formed between them to reduce the contact surface, thereby reducing the frictional heat inside the magnetic clutch (100).

[0031] When the above magnetic operation is performed, the flow rate of the hydraulic pump (300) is formed quickly and stably, and

[0032] When switching from the magnetic operation state to the non-operation state, the wave shape of the fixed disc (10) acts as an elastic restoration function, thereby improving the ON / OFF switching responsiveness of the magnetic clutch (100). Effects of the invention

[0033] As seen above, the present invention replaces the conventional flat fixed disc with the wave-shaped fixed disc of the present invention, thereby reducing the contact surface between the fixed disc and the movable disc, so that when the magnetic clutch is operated, the external temperature of the magnetic clutch is reduced by more than 10°C, resulting in a heat reduction effect, and the discharge flow rate on the crane side and the discharge flow rate on the winch side are maintained almost constant, which helps improve product quality.

[0034] In addition, by manufacturing the disc from high-strength carbon steel using a press mold, it has the effect of improving durability and enabling the formation of a stable flow rate that remains consistent even during repetitive magnetic operation. Brief explanation of the drawing

[0035] FIG. 1 is a drawing of an embodiment showing the structure of a magnetic clutch according to the present invention. FIG. 2 is a drawing of an embodiment showing a plate assembly on which a fixed disk and a movable disk are mounted according to the present invention. FIG. 3 is an exploded view according to one embodiment of a magnetic clutch according to the present invention. FIG. 4 is a drawing of an embodiment showing a fixed disk and a movable disk according to the present invention. FIG. 5 is a drawing of an embodiment showing a wave point of a fixed disk according to the present invention. FIG. 6 is a drawing of an embodiment showing a reduced contact surface position when using a wave-shaped fixed disk according to the present invention. FIG. 7 is a drawing of an embodiment showing a heat reduction effect when using a wave-shaped fixed disk according to the present invention. FIG. 8 is a drawing of an embodiment showing a flow rate increase effect when using a wave-shaped fixed disk according to the present invention. FIG. 9 is a drawing of an embodiment showing a press mold for producing a wave-shaped fixed disk according to the present invention. FIG. 10 is a drawing of an embodiment showing a tester for testing the pump flow rate during operation of a magnetic clutch according to the present invention. Specific details for implementing the invention

[0036] Before describing various embodiments of the present invention in detail, it will be understood that the application is not limited to the details of the configuration and arrangement of components described in the following detailed description or illustrated in the drawings. The present invention may be embodied and practiced in other embodiments and may be carried out in various ways. Furthermore, it will be understood that the expressions and terms used herein regarding device or element orientations (e.g., "front," "back," "up," "down," "top," "bottom," "left," "right," "lateral") are used merely to simplify the description of the present invention and do not indicate or imply that the related device or element must simply have a specific orientation. Additionally, terms such as "first" and "second" are used in this and the appended claims for illustrative purposes and are not intended to indicate or imply relative importance or intent.

[0038] The present invention has the following features to achieve the above objective.

[0039] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0040] Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0043] Hereinafter, a wave disk for a magnetic clutch according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 1 to 10.

[0044] The wave disc for a magnetic clutch according to the present invention is intended to solve the problems of heat generation and discharge volume of conventional discs. When a flat fixed disc (10) and a movable disc (20) are in close contact (magnetic operation ON), a fixed disc (10) with a wave shape is applied to replace the flat fixed disc (10), thereby reducing the friction surface to reduce heat generation, while creating a pocket that forms a flow rate by providing a gap space between the fixed disc (10) and the movable disc (20) due to the wave shape, thereby generating a better flow rate.

[0046] First, to explain the operation of the magnetic pump clutch (100), it is connected to the power shaft of the engine (200) via a universal joint and is a device that controls the drive of the winch and crane using the hydraulic pressure of the hydraulic pump (300) through an electric magnetic (electromagnetic) operating method.

[0047] When current is applied to the magnetic coil, the fixed disc (10) and the movable disc (20) come into close contact due to magnetic action, and rotational power is transmitted. This power drives the hydraulic pump (300) to generate hydraulic pressure necessary for operating the winch and crane.

[0048] ※ Operation sequence: Rotational power of engine (200) --> Magnetic clutch (100) control --> Hydraulic pump (300) drive --> Winch and crane operation

[0049] The operating principle is as follows.

[0050] (a) Non-energized state (power off):

[0051] No current flows through the coil, so no magnetic force is formed.

[0052] Therefore, the hydraulic pump (300) is not driven, and both the crane shaft and the winch shaft inside the hydraulic pump (300) are in a completely stopped state where no discharge occurs.

[0053] (b) Power on:

[0054] When current is applied to the coil, a magnetic force is formed inside the magnetic assembly, and the movable disc (20) is pressed against the fixed disc (10) by the magnetic force, and as the two friction surfaces are pressed together, the rotational power of the engine (200) is transmitted to the hydraulic pump (300) shaft.

[0055] When the hydraulic pump (300) is driven, hydraulic pressure is formed according to the internal flow path structure of the hydraulic pump (300), and the hydraulic pressure is branched by the internal hydraulic circuit and discharged to the crane shaft and the winch shaft, respectively.

[0056] Winch shaft discharge flow rate 65.5 L / MIN or more (1750 RPM & pressure 170 kg / ㎠)

[0057] Crane shaft discharge flow rate 32.7 L / MIN or more (1750 RPM & pressure 170 kg / ㎠)

[0058] The above discharge amount measurement value can be used as a measuring instrument dedicated to magnetic clutches to prove that the wave-shaped fixed disc (10) shows better performance than the flat-shaped conventional fixed disc after measurement.

[0059] (c) Block (Return to off) :

[0060] When the current is cut off, the magnetic force disappears, and the movable disc (20) returns to its original position by the return spring force and the elastic restoring force of the wave-shaped fixed disc (10). The friction surface is separated, power transmission is immediately stopped, the hydraulic pump (300) stops operating, and the operation of the winch and crane stops.

[0061] The magnetic clutch (100) is a hydraulic pump (300) for operating the winch and crane of the Army K288 rescue armored vehicle, and stable hydraulic pressure must be sent when operating the winch and crane to ensure accurate towing of equipment and safety of the surroundings.

[0063] To this end, the present invention relates to a magnetic clutch (100) that controls power transmission ON / OFF by magnetically operating a fixed disc (10) and a movable disc (20) to transmit the rotational power of an engine (200) to a hydraulic pump (300) in order to operate a winch and a crane installed on various rescue vehicles and armored vehicles of the army, by driving a hydraulic pump (300) with the rotational power of an engine (200) to generate hydraulic power required for winch operation.

[0064] By configuring the outer surface of the fixed disc (10), which is connected to and rotated by the engine (200), into a wave shape that ripples along the circumferential surface, so that when the movable disc (20) comes into contact with the fixed disc (10) for the operation of the winch, the entire surface of the two is not in contact in a flat shape, but rather a space is formed where the two are locally lifted, thereby reducing the contact surface, so that frictional heat inside the magnetic clutch (100) is reduced, and when the magnetic operation is performed, the flow rate of the hydraulic pump (300) is formed quickly and stably, and when switching from the magnetic operation to the non-operation state, the wave shape of the fixed disc (10) acts as an elastic restoring function, thereby improving the ON / OFF switching responsiveness of the magnetic clutch (100).

[0066] The above fixed disk (10) is

[0067] Wave points (12) are formed on the circumferential surface at preset angle intervals (e.g., a total of 4 locations at 90-degree intervals, etc.) such that the disk is lifted upward, thereby helping to ensure stable axis rotation due to the constant wave shape.

[0068] The height of the wave point (12), which is the part that rises upward, is set to 0.8 to 1.2 mm, and the wave point (12) part does not come into contact with the flow disk (20) so that frictional heat is reduced and a space for oil to enter is secured so that heat generation is prevented.

[0070] In addition, the fixed disk (10) and the movable disk (20) are

[0071] A number of fixed disks (10) are spaced apart and used alternately (e.g., 7 fixed disks (10) and 6 movable disks (20)). When magnetically operated, one side of the fixed disk (10) contacts the movable disk (20) only at the wave point (12) portion, and the other side of the fixed disk (10) contacts the movable disk (20) only at the portion other than the wave point (12), thereby reducing friction and heat generation. Additionally, the diameter of the fixed disk (10) is formed to be smaller than the diameter of the movable disk (20), so that space for oil is secured between the arranged movable disks (20) and the outer edges of the movable disks (20), thereby preventing heat generation.

[0072] The above fixed disk (10) and flow disk (20) are made of high-strength carbon steel so that stable flow rate can be formed even with repeated magnetic operation.

[0073] To explain in more detail the installation locations of the fixed disk (10) and the movable disk (20) mentioned above,

[0074] The fixed disk (10) and the movable disk (20) each have a connecting hole (H) formed in the center and are installed on the outer circumference of a plate assembly (30) that is connected to and rotated with the engine (200) inside the magnetic clutch (100).

[0075] The above fixed disk (10) is formed with a spline (11) in the connecting hole (H) so as to correspond to the spline connecting shaft (31) formed in the plate assembly (30), and rotates together with the engine (200).

[0076] In the above-mentioned fluid disk (20), a plurality of fastening holes (21) are formed around the outer circumference of the fluid disk (20) so as to correspond to and be fastened with a plurality of protrusions (33) formed on the outer circumference of the connector (32) in the connector (32) which is connected to the hydraulic pump (300) to enable power transmission.

[0077] When the magnetic operation is performed, the movable disc (20) is in close contact with the fixed disc (10) and rotates together, thereby transmitting the rotational power of the engine (200) to the hydraulic pump (300).

[0079] In addition, in the case of the wave point (12) of the fixed disk (10) having a wave shape,

[0080] It can be manufactured so as to be formed in multiple places (e.g., 4 places at 90-degree intervals, etc.) on the outer edge of the fixed disk (10) using a press bending die (40, press die), and

[0081] In the case of such a press bending die (40),

[0082] It may be composed of a lower mold (41) that forms a plurality of recessed portions (43) that are recessed downward in an arc cross-section at preset angle intervals on the upper surface of a flat base (42) on which a plate material for manufacturing a fixed disc (10) is placed, and an upper mold (44) that is installed to be vertically movable toward the lower mold (41) and has a plurality of protruding portions (45) formed on its bottom surface so as to be inserted into the plurality of recessed portions (43).

[0085] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto and it is obvious that various modifications and changes are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs. Explanation of the symbols

[0086] 10: Fixed disk 11: Spline 12: Wavepoint 20: Floating disk 21: Fastening hole 30: Plate assembly 31: Spline connecting shaft 32: Connector 33: Protrusion 40: Press bending die 41: Bottom mold 42: Base 43: Depressed area 44: Upper mold 45: Protrusion 100: Magnetic clutch 200: Engine (for substitute motor TESTER) 300: Hydraulic pump H: Connection hole

Claims

Claim 1 In order to operate the winch and crane installed on the Army rescue armored vehicle, when the hydraulic pump (300) is driven by the rotational power of the engine (200) to generate hydraulic pressure necessary for winch operation, in order to transmit the rotational power of the engine (200) to the hydraulic pump (300), in a magnetic clutch (100) that controls power transmission ON / OFF by magnetic operation, a wave point (12) is formed at multiple locations on the outer edge of the fixed disc (10) which is connected to and rotated by the engine (200), so that the fixed disc (10) is configured in a wave shape that ripples along the circumferential surface, so that even when the movable disc (20) comes into contact with the fixed disc (10) for winch operation, the entire surface of the two surfaces does not come into contact in a flat shape, but rather forms a locally lifted clearance space between them, thereby reducing the contact surface, so that the inside of the magnetic clutch (100) A wave disc for a magnetic clutch characterized by reducing frictional heat, ensuring that the flow rate of the hydraulic pump (300) is formed quickly and stably during magnetic operation, and that when switching from magnetic operation to non-operation, the wave shape of the fixed disc (10) acts as an elastic restoring function to improve the ON / OFF switching responsiveness of the magnetic clutch (100). Claim 2 A wave disc for a magnetic clutch according to claim 1, characterized in that the fixed disc (10) has wave points (12) formed at 90-degree intervals on the circumferential surface at four locations where the disc lifts upward, thereby helping to ensure stable shaft rotation due to a constant wave shape. Claim 3 A wave disc for a magnetic clutch according to claim 1 or 2, characterized in that the height of the wave point (12), which is the part that is lifted upward, of the fixed disc (10) is 0.8 to 1.2 mm, and the wave point (12) part does not come into contact with the movable disc (20) to reduce frictional heat and secure a space for oil to enter so as to prevent heat generation. Claim 4 A wave disk for a magnetic clutch according to claim 1, wherein the fixed disk (10) and the movable disk (20) are alternately spaced apart and used, so that when the magnetic is operated, only the wave point (12) portion of one side of the fixed disk (10) contacts the movable disk (20), and only the portion other than the wave point (12) of the other side of the fixed disk (10) contacts the movable disk (20), thereby reducing friction surface and heat generation. Claim 5 A wave disc for a magnetic clutch according to claim 1, wherein the fixed disc (10) and the movable disc (20) are alternately spaced apart and used, the diameter of the fixed disc (10) is formed to be smaller than the diameter of the movable disc (20), and a space for oil to be entered is secured between the outer edges of the arranged movable disc (20) and the movable disc (20) to prevent heat generation. Claim 6 In claim 1, the fixed disk (10) and the movable disk (20) are installed on the outer circumference of a plate assembly (30) that is connected to and rotated with the engine (200) inside the magnetic clutch (100), with a connecting hole (H) formed in the center. The fixed disk (10) is configured to rotate together with the engine (200) by forming a spline (11) in the connecting hole (H) so as to correspond to a spline connecting shaft (31) formed in the plate assembly (30). The movable disk (20) is configured to be connected to a hydraulic pump (300) via a connecting body (32) that allows power transmission. A plurality of fastening holes (21) are formed around the outer circumference of the movable disk (20) so as to correspond to and be fastened with a plurality of protrusions (33) formed on the outer circumference of the connecting body (32). When the magnetic operation occurs, the movable disk (20) is in close contact with the fixed disk (10) and rotates together. A wave disc for a magnetic clutch characterized by transmitting the rotational power of the engine (200) to the hydraulic pump (300). Claim 7 A wave disc for a magnetic clutch according to claim 1, characterized in that the fixed disc (10) and the flow disc (20) are made of high-strength carbon steel so as to enable stable flow formation even with repeated magnetic operation. Claim 8 A wave disc for a magnetic clutch, characterized in that, in claim 1, the wave point (12) is manufactured to be formed using a press bending die (40). Claim 9 In claim 8, the above press bending die (40) is characterized by being composed of: a lower die (41) that forms a plurality of recessed portions (43) that are recessed downward in an arc cross-section at preset angle intervals on the upper surface of a flat base (42) on which a plate material for making a fixed disc (10) is placed; and an upper die (44) that is installed to be vertically movable toward the lower die (41) and has a plurality of protruding portions (45) formed on its bottom surface so as to be inserted into the plurality of recessed portions (43).

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