An overload protection transmission device

Abstract

The utility model discloses an overload protection transmission device, which relates to the technical field of agricultural machinery and equipment, including a shell and a main power shaft, the main power shaft is rotatably arranged in the shell, and includes a transmission component, the transmission component includes a transmission rod, a lower transmission seat, a transmission sprocket, an elastic component and a spring cover, the transmission rod is rotatably arranged on the shell, the lower end of the transmission rod is transmission-connected with the main power shaft, the lower transmission seat, the transmission sprocket, the elastic component and the spring cover are sequentially arranged on the transmission rod from bottom to top, the lower transmission seat is transmission-connected with the transmission rod, the transmission sprocket is rotationally matched with the transmission rod, the upper end surface of the lower transmission seat is provided with a meshing tooth groove, the lower end surface of the transmission sprocket is provided with meshing teeth corresponding to the meshing tooth groove, the cross-section of the meshing teeth is arranged in an isosceles trapezoid, the elastic component presses the meshing teeth of the transmission sprocket down into the meshing tooth groove, and the scheme can disconnect power transmission when the transmission sprocket is subjected to resistance overload.

Description

Technical Field

[0001] The utility model relates to the technical field of agricultural machinery and equipment, in particular to an overload protection transmission device. Background Art

[0002] During the operation of the corn harvester, power needs to be transmitted to each reed chain through the gearbox, and the corn stalks are harvested through the reed chain. When the reed chain encounters an abnormal situation and is stuck and cannot run, the gears of the transmission parts inside the gearbox will generate a large load. If it continues to run, it will cause the gear chain to break, causing damage to the mechanical equipment, thereby affecting the normal operation of the corn harvester. The overload protection device in the prior art usually causes a large radial force at the friction position due to the matching clearance and processing accuracy problems, resulting in the clutch structure cannot be effectively opened, thereby causing the insurance failure shaft breakage. Utility Model Content

[0003] The purpose of the utility model is to provide an overload protection transmission device in view of the deficiencies in the prior art.

[0004] An overload protection transmission device comprises a shell and a main power shaft, the main power shaft is rotatably arranged in the shell, and comprises a transmission assembly, the transmission assembly comprises a transmission rod, a lower transmission seat, a transmission sprocket, an elastic component and a spring cover, the transmission rod is rotatably arranged on the shell, the lower end of the transmission rod is transmission-connected to the main power shaft, the lower transmission seat, the transmission sprocket, the elastic component and the spring cover are sequentially arranged on the transmission rod from bottom to top, the lower transmission seat is transmission-connected to the transmission rod, the transmission sprocket is rotationally matched with the transmission rod, the upper end face of the lower transmission seat is provided with a meshing tooth groove, the lower end face of the transmission sprocket is provided with meshing teeth corresponding to the meshing tooth groove, the cross-section of the meshing teeth is arranged in an isosceles trapezoid, and the elastic component presses the meshing teeth of the transmission sprocket down into the meshing tooth groove.

[0005] Furthermore, a driving bevel gear is arranged on the main power shaft, a transmission bevel gear is arranged on the lower end of the transmission rod, and the driving bevel gear is transmission-connected with the transmission bevel gear.

[0006] Furthermore, a plurality of transmission components are provided, and the main power shaft is provided with driving bevel gears having the same number as the transmission components, the setting positions of the plurality of transmission components correspond to the setting positions of the driving bevel gears, and the transmission bevel gears on the plurality of transmission components are meshed with the driving bevel gears at corresponding positions on the main power shaft.

[0007] Furthermore, the elastic component is a column spring.

[0008] Furthermore, the elastic component is a spring.

[0009] Furthermore, the lower transmission seat and the transmission rod are detachable structures, a mounting piece is provided on the transmission rod, a mounting groove is provided on the lower transmission seat, and the mounting piece is embedded in the mounting groove of the lower transmission seat.

[0010] Furthermore, the transmission rod is provided with an upper cover and a lower cover, the upper cover is provided with a cavity with an opening facing downward, the lower cover is provided with a cavity with an opening facing upward, the lower cover is folded to the inner side of the upper cover, the elastic component is in the cavity between the upper cover and the lower cover, the upper end surface of the upper cover contacts with the lower end surface of the spring cover, and the lower end surface of the lower cover contacts with the upper end surface of the transmission sprocket at the elastic component.

[0011] Furthermore, an external thread is provided on the side of the transmission rod away from the shell, and a fastening nut is provided above the spring cover. The internal thread of the fastening nut fits with the external thread on the transmission rod, and the fastening nut adjusts the interval between the spring cover and the transmission sprocket.

[0012] Furthermore, the angle formed between the beveled edge of the meshing tooth and the horizontal plane is 100°-140°.

[0013] Furthermore, the angle formed by the beveled edge of the meshing teeth and the horizontal plane is 110°, 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, 120°, 121°, 122°, 123°, 124°, 125°, 126°, 127°, 128°, 129°, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139° or 140°.

[0014] The advantages of the utility model compared with the prior art are:

[0015] First: This solution drives the main power shaft to rotate through the power source, and the main power shaft drives the transmission rod, and the transmission rod drives the transmission sprocket to rotate. When an abnormal situation occurs and causes the plowing chain to get stuck, the transmission load between the meshing tooth grooves and the meshing teeth on the lower transmission seat is too large, and the entire transmission sprocket is lifted upward by utilizing the inclined surface to separate the meshing tooth grooves from the meshing teeth. At this time, the main power shaft, the transmission rod and the lower transmission seat rotate on their own, and the transmission sprocket stops rotating to achieve power separation. When the plowing chain is always in a stuck state, the meshing tooth grooves and the meshing teeth continue to cooperate and separate. When the plowing chain resumes normal operation, the elastic component and the spring cover press the meshing teeth back into the meshing tooth grooves to restore power transmission.

[0016] Second: the transmission rod in this scheme is connected with the mounting part in transmission, and the transmission sprocket is arranged on the transmission rod and rotates with it. When the meshing teeth and the meshing tooth grooves are overloaded, the inner wall of the transmission sprocket and the outer wall of the transmission rod slide and cooperate with each other, thereby reducing the friction force. The radial force at the friction position is relatively low, thereby ensuring the immediate and smooth separation of the meshing teeth and the meshing tooth grooves in the overload state.

[0017] Third: In this solution, the elastic components therein are protected by the upper cover and the lower cover. The upper end surface of the upper cover contacts the lower end surface of the spring cover, and the lower end surface of the lower cover contacts the upper end surface of the transmission sprocket, thereby ensuring the transmission of elastic force of the elastic components between the upper cover and the lower cover.

[0018] Fourthly, the lower transmission seat and the transmission rod in the present scheme are detachable structures, so as to facilitate the installation and disassembly of the transmission rod. A mounting piece is provided on the transmission rod, and a mounting groove is provided on the lower transmission seat. During assembly, the mounting piece is embedded in the mounting groove of the lower transmission seat, and power transmission can be achieved through the cooperation between the mounting piece and the mounting groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of this scheme;

[0020] Figure 2 This is a cross-sectional view of this scheme;

[0021] Figure 3 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 4 is a schematic diagram of the first matching state of the meshing tooth groove and the meshing tooth;

[0023] Figure 5 is a schematic diagram of the second matching state of the meshing tooth groove and the meshing tooth;

[0024] Figure 6 Schematic diagram of the setting status of meshing teeth.

[0025] Figure numerals: housing 1, main power shaft 2, main bevel gear 21, transmission rod 3, transmission bevel gear 31, mounting member 32, lower transmission seat 4, meshing tooth groove 41, transmission sprocket 5, meshing tooth 51, elastic component 6, upper cover 61, lower cover 62, spring cover 7, fastening nut 8. DETAILED DESCRIPTION

[0026] Combined with Figure 1-6As shown, an overload protection transmission device is used in the gearbox of a corn harvester. The transmission device is arranged in the gearbox. When the straw chain is in a stuck and locked state during the harvesting process, it can be disconnected in time to prevent the straw chain and the gear set from breaking or breaking.

[0027] like Figure 1-2 As shown, the gearbox includes a housing 1, a main power shaft 2 and a transmission assembly. The main power shaft 2 is rotatably arranged in the housing 1, and the power source is transmission-connected to the main power shaft 2. A plurality of transmission assemblies can be provided. The number of transmission assemblies is set in combination with the output requirements of the current gearbox. In this scheme, two transmission assemblies are preferably provided. The two transmission assemblies are rotatably arranged on the housing 1, and the main power shaft 2 is transmission-connected to the two transmission assemblies. The transmission assembly includes a transmission rod 3, a transmission bevel gear 31, a lower transmission seat 4, a transmission sprocket 5, an elastic component 6 and a spring cover 7. The transmission bevel gear 31 is arranged at the lower end of the transmission rod 3, and the transmission seat is fixedly installed on the transmission rod 3. The transmission sprocket 5 and the elastic component 6 are sleeved on On the transmission rod 3, the spring cover 7 is fixed on the transmission rod 3. In this scheme, the transmission bevel gear 31, the lower transmission seat 4, the transmission sprocket 5, the elastic component 6 and the spring cover 7 are arranged on the transmission rod 3 from bottom to top in sequence, wherein the transmission bevel gear 31, the lower transmission seat 4 and the spring cover 7 are fixedly matched with the transmission rod 3, and an active bevel gear 21 is arranged on the active power shaft 2, and the active bevel gear 21 is meshed with the transmission bevel gear 31. The upper end surface of the lower transmission seat 4 is provided with a meshing tooth groove 41, and the lower end surface of the transmission sprocket 5 is provided with a meshing tooth 51 corresponding to the meshing tooth groove 41. The mutual cooperation between the meshing tooth groove 41 and the meshing tooth 51 can realize the power transmission between the lower transmission seat 4 and the transmission sprocket 5.

[0028] In this solution, the clutching effect on the power is achieved by the mutual cooperation between the inner meshing teeth 51 and the meshing tooth grooves 41. Therefore, the bevel angle of the meshing teeth 51 will affect the clutch efficiency of the gearbox. The present application is set in combination with the operating state of the equipment. The angle formed between the bevel of the meshing teeth 51 and the horizontal plane is 100°-140°, and the angle formed between the bevel of the meshing teeth 51 and the horizontal plane is 110°, 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, 120°, 121°, 122°, 123°, 124°, 125°, 126°, 127°, 128°, 129°, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139°, 140°, 141°, 142°, 143°, 144°, 145°, 146°, 147°, 148°, 149°, 150°, 151°, 152°, 153°, 154°, 155°, 156°, 157°, 158°, 159°, 160°, 161°, 162°, 163°, 164°, 165°, 166°, 167°, 168°, 169° 16°, 117°, 118°, 119°, 120°, 121°, 122°, 123°, 124°, 125°, 126°, 127°, 128°, 129°, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139° or 140°; wherein the angle formed by the bevel of the meshing tooth 51 and the horizontal plane is preferably 125°.

[0029] It can be selected that the number of active bevel gears 21 is the same as the number of transmission components, the setting positions of multiple active bevel gears 21 correspond to the setting positions of multiple transmission components, and the active bevel gears 21 can drive the transmission rods 3 in the transmission components at corresponding positions to rotate.

[0030] Preferably, Figure 4-5 As shown, the cross-section of the meshing tooth 51 is arranged in an isosceles trapezoid, and the notch of the meshing tooth groove 41 is also arranged in an isosceles trapezoid. The trapezoidal structure of the meshing tooth 51 cooperates with the meshing tooth groove 41. When the transmission load between the meshing tooth 51 and the meshing tooth groove 41 is too large, the bevel of the meshing tooth 51 will cooperate with the bevel of the meshing tooth groove 41 to lift the entire transmission sprocket 5 upward, and the meshing tooth groove 41 and the meshing tooth 51 are separated by the bevel cooperation.

[0031] During the normal operation of the equipment, the main power shaft 2 is driven to rotate by the power source, and the main power shaft 2 transmits power to the transmission bevel gear 31 through the active bevel gear 21. The rotation of the transmission bevel gear 3 drives the transmission rod 3 to rotate, and the transmission rod 3 drives the lower transmission seat 4 to rotate. The transmission sprocket 5 is pressed downward by the cooperation of the elastic component 6 and the spring cover 7, so that the meshing teeth 51 set on the lower end surface of the transmission sprocket 5 are embedded in the meshing tooth groove 41. When the lower transmission seat 4 rotates, it will drive the transmission sprocket 5 to rotate, and the power is transmitted to the straw-pulling link through the transmission sprocket 5 to realize the straw-pulling operation of the corn harvester.

[0032] When an abnormal situation occurs and causes the plowing chain to get stuck, the power source drives the main power shaft 2 to rotate, and the main power shaft 2 transmits power to the transmission bevel gear 31 through the active bevel gear 21. The rotation of the transmission bevel gear 3 drives the transmission rod 3 to rotate, and the transmission rod 3 drives the lower transmission seat 4 to rotate. At this time, due to the excessive transmission load between the meshing tooth grooves 41 and the meshing teeth 51 on the lower transmission seat 4, the entire transmission sprocket 5 is lifted upward by the inclined surface to separate the meshing tooth grooves 41 from the meshing teeth 51. At this time, the main power shaft 2, the transmission rod 3 and the lower transmission seat 4 rotate by themselves, and the transmission sprocket 5 stops rotating to achieve power separation. When the plowing chain is always in a stuck state, the meshing tooth grooves 41 and the meshing teeth 51 continue to cooperate and separate. When the plowing chain resumes normal operation, the elastic component 6 and the spring cover 7 press the meshing teeth 51 back into the meshing tooth grooves 41 to restore power transmission.

[0033] Alternatively, the lower transmission seat 4 and the transmission rod 3 in this solution are integrally formed to ensure structural strength;

[0034] Alternatively, the lower transmission seat 4 and the transmission rod 3 in the present embodiment are of a detachable structure, so as to facilitate the installation and disassembly of the transmission rod 3. A mounting member 32 is provided on the transmission rod 3, and a mounting groove is provided on the lower transmission seat 4. During assembly, the mounting member 32 is embedded in the mounting groove of the lower transmission seat 4, and power transmission can be achieved through the cooperation between the mounting member 32 and the mounting groove.

[0035] Alternatively, the elastic component 6 in the present solution may be a column spring, a spring sheet or other components capable of generating downward elastic force.

[0036] Preferably, if a hard material is stuck in the elastic component 6 during the operation of the equipment, the lower transmission seat 4 and the transmission sprocket 5 cannot be separated, resulting in damage to the equipment, such as Figure 3 As shown, in order to prevent foreign particles from being stuck in the elastic component 6, an upper cover 61 and a lower cover 62 are provided at the elastic component 6. The upper cover 61 and the lower cover 62 are provided in a semi-enclosed structure. The upper cover 61 is provided with a cavity opening downward, and the lower cover 62 is provided with a cavity opening upward. The lower cover 62 can be folded to the inner side of the upper cover 61. The upper cover 61 and the lower cover 62 are sleeved on the transmission rod 3. The elastic component 6 is in the cavity between the upper cover 61 and the lower cover 62. The elastic component 6 therein is protected by the upper cover 61 and the lower cover 62, wherein the spring cover 7 can also be provided on the inner side of the upper cover 61, and the upper end face of the spring cover 7 contacts the top of the inner side wall of the upper cover 61, and the lower end face of the lower cover 62 contacts the upper end face of the transmission sprocket 5, thereby ensuring the transmission of the elastic force of the elastic component 6 between the upper cover 61 and the lower cover 62.

[0037] Preferably, an external thread is provided on the side of the transmission rod 3 away from the shell 1, and a fastening nut 8 is provided above the spring cover 7. The internal thread of the fastening nut 8 fits with the external thread on the transmission rod 3. By adjusting the fastening nut 8, the interval between the spring cover 7 and the transmission sprocket 5 can be adjusted. The lower the fastening nut 8 is, the smaller the interval between the spring cover 7 and the transmission sprocket 5 is, the greater the elastic potential energy of the elastic component 6 is, and the greater the resistance required for overload at this time; the higher the fastening nut 8 is, the greater the interval between the spring cover 7 and the transmission sprocket 5 is, the smaller the elastic potential energy of the elastic component 6 is, and the smaller the resistance required for overload at this time.

[0038] Preferably, the axis of the transmission rod 3 in this scheme is perpendicular to the axis of the main power shaft 2. The transmission rod 3 is rotatably set on the shell 1, and a deep groove ball bearing is arranged between the transmission rod 3 and the shell 1. The deep groove ball bearing is used to limit the installation of the transmission rod 3, and the setting stability and rotation stability of the transmission rod 3 are guaranteed, thereby improving the power transmission efficiency.

[0039] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0042] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An overload protection transmission device, comprising a housing (1) and a main power shaft (2), wherein the main power shaft (2) is rotatably arranged in the housing (1), characterized in that: The invention comprises a transmission assembly, wherein the transmission assembly comprises a transmission rod (3), a lower transmission seat (4), a transmission sprocket (5), an elastic component (6) and a spring cover (7); the transmission rod (3) is rotatably arranged on a housing (1); the lower end of the transmission rod (3) is transmission-connected to a main power shaft (2); the lower transmission seat (4), the transmission sprocket (5), the elastic component (6) and the spring cover (7) are sequentially arranged on the transmission rod (3) from bottom to top; the lower transmission seat (4) is transmission-connected to the transmission rod (3); the transmission sprocket (5) and the transmission rod (3) are rotationally matched; the upper end surface of the lower transmission seat (4) is provided with a meshing tooth groove (41); the lower end surface of the transmission sprocket (5) is provided with a meshing tooth tooth (51) corresponding to the meshing tooth groove (41); the cross section of the meshing tooth tooth (51) is arranged in an isosceles trapezoid; the elastic component (6) presses the meshing tooth tooth (51) of the transmission sprocket (5) downward into the meshing tooth groove (41).

2. An overload protection transmission device according to claim 1, characterized in that: A driving bevel gear (21) is arranged on the main power shaft (2), a transmission bevel gear (31) is arranged at the lower end of the transmission rod (3), and the driving bevel gear (21) is transmission-connected to the transmission bevel gear (31).

3. An overload protection transmission device according to claim 2, characterized in that: A plurality of transmission assemblies are provided, the main power shaft (2) is provided with driving bevel gears (21) of the same number as the transmission assemblies, the arrangement positions of the plurality of transmission assemblies correspond to the arrangement positions of the driving bevel gears (21), and the transmission bevel gears (31) on the plurality of transmission assemblies mesh with the driving bevel gears (21) at corresponding positions on the main power shaft (2).

4. An overload protection transmission device according to claim 1, characterized in that: The elastic component (6) is a column spring.

5. The overload protection transmission device according to claim 1, characterized in that: The elastic component (6) is a spring sheet.

6. An overload protection transmission device according to claim 1, characterized in that: The lower transmission seat (4) and the transmission rod (3) are detachable structures; a mounting member (32) is provided on the transmission rod (3); a mounting groove is provided on the lower transmission seat (4); and the mounting member (32) is embedded in the mounting groove of the lower transmission seat (4).

7. An overload protection transmission device according to claim 1, characterized in that: The transmission rod (3) is provided with an upper cover (61) and a lower cover (62); the upper cover (61) is provided with a cavity with an opening facing downward, and the lower cover (62) is provided with a cavity with an opening facing upward; the lower cover (62) is folded inside the upper cover (61); the elastic component (6) is located in the cavity between the upper cover (61) and the lower cover (62); the upper end surface of the upper cover (61) contacts the lower end surface of the spring cover (7), and the lower end surface of the lower cover (62) contacts the upper end surface of the transmission sprocket (5) at the elastic component (6).

8. An overload protection transmission device according to claim 1, characterized in that: An external thread is arranged on the side of the transmission rod (3) away from the housing (1), and a fastening nut (8) is arranged above the spring cover (7). The internal thread of the fastening nut (8) fits with the external thread on the transmission rod (3), and the fastening nut (8) adjusts the interval between the spring cover (7) and the transmission sprocket (5).

9. An overload protection transmission device according to claim 1, characterized in that: The angle formed between the bevel of the meshing tooth (51) and the horizontal plane is 100°-140°.

10. An overload protection transmission device according to claim 9, characterized in that: The angle formed by the bevel of the meshing tooth (51) and the horizontal plane is 110°, 111°, 112°, 113°, 114°, 115°, 116°, 117°, 118°, 119°, 120°, 121°, 122°, 123°, 124°, 125°, 126°, 127°, 128°, 129°, 130°, 131°, 132°, 133°, 134°, 135°, 136°, 137°, 138°, 139° or 140°.

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