Reduction gearbox body and reduction gearbox

Abstract

The utility model relates to the technical field of reduction gearboxes, in particular to a reduction gearbox body and a reduction gearbox. The reduction gearbox body comprises an upper box body, a lower box body and fasteners, the upper box body and the lower box body are both box bodies without box edges, the upper box body comprises a side plate and a top plate which are welded, the lower box body comprises a bottom plate and a side plate which are welded, the upper box body is provided with a plurality of mounting holes corresponding to the fasteners in a one-to-one mode, and the fasteners are arranged in the mounting holes. The installation holes extend from the bottom face of the upper box body to the top face of the upper box body and sequentially penetrate through the side plates and the top plate of the upper box body, the installation holes comprise counter bores and straight holes which are communicated, the counter bores are higher than the straight holes, and the diameter of the counter bores is larger than that of the straight holes. As box edges do not need to be annularly welded on the circumferential surfaces of the upper box body and the lower box body, the situation that oil leaks and leaks easily due to the fact that welding seams around the box edges are many and welding defects are easily generated can be avoided, the sealing performance of the reduction gearbox is improved, and the service life of the reduction gearbox is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of reduction gearboxes, in particular to a reduction gearbox housing and a reduction gearbox. Background Art

[0002] The reducer used in the plate rolling machine is mainly used to reduce the speed and increase the torque. It can also change the transmission direction and realize power distribution. It is widely used in industry and daily life.

[0003] At present, the welded reducer housing includes an upper housing and a lower housing. Both the upper housing and the lower housing are welded by multiple steel plates, and the upper housing edge is welded on the upper housing, and the lower housing edge is welded on the lower housing. The upper housing edge and the lower housing edge are connected by bolts. Since the upper and lower housing edges are welded by ring welding, the ring welding is difficult, and the number of welds generated during the ring welding is large. This is because the circumferential surfaces of the upper housing and the lower housing need to be welded to ensure the strength and sealing of the connection. Due to the uneven temperature distribution during the welding process, thermal stress and deformation are caused, and residual stress is formed under the action of external constraints. After cooling after welding, different tissues are formed from the weld to the parent material. The properties of these tissues are different, and the strength, hardness, toughness, and plasticity are uneven, which will cause damage at the fragile part from the weld to the parent material. In addition, welding defects such as undercuts and cracks will also reduce the sealing of the welded joints, causing the lubricating oil to flow out of the housing through these defective parts. The presence of these welding defects not only affects the sealing of the reducer housing, but may also affect its mechanical strength and durability, because they are potential stress concentration points, which may cause the generation and expansion of cracks during operation, further aggravating the oil leakage problem. Utility Model Content

[0004] (I) The problem to be solved by the present invention is that the reduction gearbox housing is welded by circumferential welding, and the number of welds produced at the housing edge is large, which is prone to welding defects and oil leakage.

[0005] (II) Technical solution

[0006] A reduction gearbox housing comprises an upper housing, a lower housing and fasteners, wherein the upper housing and the lower housing are housings without housing edges; the upper housing comprises welded side plates and a top plate, and the lower housing comprises welded bottom plates and side plates;

[0007] The upper box body is provided with a plurality of mounting holes corresponding to the fasteners one by one, and the mounting holes extend from the bottom surface of the upper box body toward the top surface thereof and pass through the side plates and the top plate of the upper box body in sequence;

[0008] The mounting hole comprises a countersunk hole and a straight hole which are connected to each other, the countersunk hole is higher than the straight hole, and the diameter of the countersunk hole is larger than the diameter of the straight hole;

[0009] A fastener is disposed in each of the mounting holes, and the fastener cooperates with the mounting hole to fix the upper box body and the lower box body;

[0010] The lower box body is provided with notches corresponding to the mounting holes one by one, the notches extend from the top surface of the lower box body toward the bottom surface thereof, the upper edge of the notches is connected to the top surface of the lower box body, and the side edge of the notches is connected to the side surface of the lower box body;

[0011] The fastener comprises at least one nut, an insert block and a threaded rod, wherein the insert block is connected to one end of the threaded rod; a limit block is respectively provided on the inner walls of both sides of the notch, a gap is formed between the two limit blocks for the threaded rod to pass through, the notch comprises an upper space and a lower space connected to each other, the limit block is located between the upper space and the lower space, and the lower space is adapted to the insert block;

[0012] The insert block is used to be inserted into the lower space, the threaded rod passes through the upper space and the mounting hole in sequence, the nut is threadedly connected to the threaded rod, and the nut is pressed on the inner bottom wall of the countersunk hole.

[0013] According to an embodiment of the utility model, a plurality of vertically arranged positioning shafts are fixedly mounted on the top surface of the lower box body, and a plurality of positioning holes corresponding to the positioning shafts are opened in the lower half of the upper box body.

[0014] According to one embodiment of the utility model, the top end of the threaded rod has a rod body coaxially arranged therewith, the diameter of the rod body is smaller than the diameter of the threaded rod, the top end of the threaded rod is provided with a first thread segment, and the rod body is provided with a second thread segment, the thread directions of the first thread segment and the second thread segment are opposite, and two nuts are provided, namely a first nut and a second nut, and the first nut and the second nut are respectively adapted to the first thread segment and the second thread segment.

[0015] According to an embodiment of the utility model, at least four mounting holes are provided, and the four mounting holes are respectively located at four corners of the upper box body.

[0016] A reduction box comprises the reduction box body mentioned above.

[0017] Beneficial effects of the utility model:

[0018] The upper box body and the lower box body in this embodiment are both boxes without box edges. When assembling the upper box body and the lower box body, it is only necessary to first place the upper box body on the lower box body, and then use fasteners and mounting holes to fix the upper box body and the lower box body together.

[0019] Since it is no longer necessary to weld the box edges around the circumference of the upper box body and the lower box body, it is possible to avoid the occurrence of oil leakage and seepage caused by multiple welds around the box edges and welding defects, thereby improving the sealing of the reduction box and increasing the service life of the reduction box.

[0020] In addition, the fastener can tightly connect the upper box body and the lower box body, has a good sealing effect, and is also easy to disassemble later. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A top view of a first reduction gearbox housing provided in an embodiment of the utility model;

[0023] Figure 2 The embodiment of the utility model provides Figure 1 Sectional view of AA in the middle;

[0024] Figure 3 A top view of a second reduction gearbox housing provided by an embodiment of the utility model;

[0025] Figure 4 The embodiment of the utility model provides Figure 3 Cross-sectional view of the middle BB;

[0026] Figure 5 A top view of a third reduction gearbox housing provided by an embodiment of the utility model;

[0027] Figure 6 The embodiment of the utility model provides Figure 5 Cross-sectional view of CC;

[0028] Figure 7 A top view of the third reduction gearbox housing provided by the embodiment of the utility model with the upper housing removed;

[0029] Figure 8 The embodiment of the utility model provides Figure 7 Cross-sectional view of the middle DD;

[0030] Fig. 9 The embodiment of the utility model provides Figure 8 Enlarged view of part E in the middle;

[0031] Fig.10A structural diagram of an insert block, a threaded rod, a first nut and a second nut provided in an embodiment of the utility model;

[0032] Fig.11 This is a structural diagram of a threaded rod and a rod body provided in an embodiment of the utility model.

[0033] Icons: 1. Lower box; 2. Upper box; 201. Mounting hole; 3. Locking bolt; 4. Positioning shaft; 5. Round rod; 6. Screw; 7. Insert; 8. Threaded rod; 801. Rod body; 802. First threaded segment; 803. Second threaded segment; 9. First nut; 10. Limit block; 11. Second nut. DETAILED DESCRIPTION

[0034] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] Embodiment 1:

[0036] An embodiment of the utility model provides a reduction gearbox housing, comprising an upper housing 2, a lower housing 1 and fasteners, wherein the upper housing 2 and the lower housing 1 are housings without housing edges; the upper housing 2 comprises side panels and a top panel welded together, and the lower housing 1 comprises a bottom panel and side panels welded together; a plurality of mounting holes 201 corresponding to the fasteners are provided on the upper housing 2, and the mounting holes 201 extend from the bottom surface of the upper housing 2 toward the top surface thereof and sequentially penetrate the side panels and the top panel of the upper housing 2; a fastener is provided in each mounting hole 201, and the fastener cooperates with the mounting hole 201 to fix the upper housing 2 and the lower housing 1.

[0037] In this embodiment, the mounting hole 201 includes a countersunk hole and a straight hole that are connected. The countersunk hole is higher than the straight hole, and the diameter of the countersunk hole is larger than the diameter of the straight hole. The countersunk hole and the straight hole are coaxially arranged.

[0038] It should be noted that both the upper box body 2 and the lower box body 1 are rectangular box structures, and both the upper box body 2 and the lower box body 1 are manufactured by welding.

[0039] That is, the upper box body 2 includes a welded top plate and four side plates, and the lower surfaces of the four side plates are the lower surface of the upper box body 2. The lower box body 1 includes a welded bottom plate and four side plates, and the upper surfaces of the four side plates of the lower box body 1 are the upper surface of the lower box body 1.

[0040] The upper box body 2 and the lower box body 1 in this embodiment are both boxes without box edges. When assembling the upper box body 2 and the lower box body 1, it is only necessary to first place the upper box body 2 on the lower box body 1, and use fasteners to cooperate with the mounting holes 201 to fix the upper box body 2 and the lower box body 1 together.

[0041] Since it is no longer necessary to weld the box edges around the circumference of the upper box body 2 and the lower box body 1, it is possible to avoid the occurrence of oil leakage and seepage caused by multiple welds around the box edges and welding defects, thereby improving the sealing of the reduction box and increasing the service life of the reduction box.

[0042] As the first type of reduction gearbox housing, Figure 1 and Figure 2 As shown, in this embodiment, threaded holes corresponding to the mounting holes 201 are provided on the top surface of the lower box body 1. That is, the threaded holes are provided on the side plates of the lower box body 1, and the threaded holes are arranged vertically.

[0043] The fastener comprises a locking bolt 3, and the locking bolt 3 comprises a bolt head and a bolt rod connected to each other. The diameter of the straight hole of the above-mentioned mounting hole 201 is larger than the diameter of the bolt rod, and the countersunk hole of the mounting hole 201 can allow the bolt head to enter.

[0044] The mounting hole 201 can be milled out, and the threaded hole can be directly drilled.

[0045] Since the side panels of the upper housing 2 and the lower housing 1 have a certain thickness, the reduction gearbox housing no longer needs to be equipped with a bearing seat separately. Instead, corresponding circular grooves for installing bearings can be directly opened on the two side panels of the upper housing 2 and the lower housing 1, thereby saving costs.

[0046] Thus, when installing the upper case 2 and the lower case 1, it is only necessary to first place the upper case 2 on the lower case 1, so that the lower surfaces of the four side panels of the upper case 2 fit on the upper surfaces of the four side panels of the lower case 1. At this time, the mounting holes 201 on the upper case 2 correspond to the threaded holes on the lower case 1, and the mounting holes 201 and the corresponding threaded holes are coaxial. Then, the locking bolt 3 is inserted into the mounting hole 201 from the top of the upper case 2, and the bolt rod of the locking bolt 3 passes through the countersunk hole and the straight hole in turn and enters the threaded hole of the lower case 1, and then the locking bolt 3 is tightened, and the bolt rod of the locking bolt 3 is screwed into the threaded hole of the lower case 1, and finally the bolt head of the locking bolt 3 is pressed against the inner bottom wall of the countersunk hole, thereby fixing the upper case 2 on the lower case 1.

[0047] The lower box body 1 also includes a bottom plate, and four side plates are welded to the bottom plate.

[0048] It can be seen that the upper box body 2 and the lower box body 1 in this embodiment do not have a box edge, so there is no need to assemble the reduction gearbox case by fastening the upper box edge and the lower box edge with bolts. Therefore, some problems caused by the reduction gearbox with a box edge in the past can be avoided, and the upper box body 2 and the lower box body 1 are easy to assemble.

[0049] It should be noted that there is no specific restriction on the number and position of the above-mentioned mounting holes 201, and there is no specific restriction on the number and position of the corresponding threaded holes on the lower box body 1, as long as the connection strength and sealing performance of the upper box body 2 and the lower box body 1 can be met.

[0050] Preferably, Figure 1 As shown, there are four mounting holes 201, which are distributed at the four corners of the upper box 2, and there are four corresponding threaded holes, which are arranged at the four corners of the lower box 1. Of course, in order to improve the connection strength and meet the sealing requirements, the mounting holes 201 can also be evenly arranged along the bottom of the lower box 1.

[0051] Optional, such as Figure 2 As shown, a vertically arranged positioning shaft 4 is installed on the upper surface of the upper box body 2, and a positioning hole corresponding to the positioning shaft 4 is opened on the bottom surface of the lower box body 1. The depth of the positioning hole is slightly greater than the length of the positioning shaft 4, and the diameter of the positioning shaft 4 is the same as the diameter of the positioning hole.

[0052] Thus, when placing the upper box 2, it is only necessary to align the positioning hole on the upper box 2 with the positioning shaft 4 of the lower box 1, and then place the upper box 2 on the lower box 1. When the positioning shaft 4 is inserted into the positioning hole, the threaded hole on the lower box 1 is naturally aligned with the mounting hole 201 on the upper box 2. The positioning shaft 4 is provided to facilitate the alignment of the upper box 2 and the lower box 1, and the positioning shaft 4 can also improve the stability between the upper box 2 and the lower box 1, and prevent the upper box 2 and the lower box 1 from being misaligned in the horizontal direction.

[0053] It should be clear that there is no specific restriction on the number and position of the positioning shafts 4 , and there is no specific restriction on the number and position of the corresponding positioning holes, as long as they are reasonable.

[0054] It should be noted that the gearbox housing usually includes an upper housing 2 and an upper housing edge integrally cast by a mold, and a lower housing 1 and a lower housing edge integrally cast. Through holes are opened on the upper housing edge, screw holes are opened on the lower housing edge, and the upper and lower housing edges are connected by bolts, thereby connecting the upper and lower housings of the gearbox together. However, the mold casting cost is high, and the bottom surface of the upper housing 2 and the top surface of the lower housing 1 are prone to pores, sand holes and other casting defects. The holes at the housing edges provide a leakage channel for the lubricating oil, so that the lubricating oil can flow out of the box through these defective parts. In addition, the large number of pores and sand holes at the upper and lower housing edges may also affect the mechanical strength and durability of the gearbox housing, because they are potential stress concentration points, which may cause the generation and expansion of cracks during operation, further exacerbating the oil leakage problem.

[0055] The upper box body 2 and the lower box body 1 in this embodiment are welded by steel plates, and the bottom surface of the upper box body 2 and the top surface of the lower box body 1 have few pores and sand holes, which can prevent the lubricating oil from flowing out of the box from these defective parts, thereby ensuring the sealing performance of the reduction box.

[0056] As the second type of reduction gearbox housing, the reduction gearbox housing in this embodiment is also manufactured by welding. Figure 3 and Figure 4 As shown, the fasteners in the reduction gearbox housing of this embodiment are different from the fasteners in the first reduction gearbox housing described above.

[0057] Specifically, in this embodiment, the fastener includes a round rod 5, a screw rod 6 and at least one nut, wherein the round rod 5 and the screw rod 6 are connected, the round rod 5 and the screw rod 6 are coaxially arranged, and the diameter of the round rod 5 is slightly larger than the diameter of the screw rod 6. The round rod 5 is fixedly mounted on the top of the lower box body 1, and the diameter of the straight hole of the mounting hole 201 in the upper box body 2 is the same as the diameter of the round rod 5.

[0058] Before assembly, the bottom end of the round rod 5 is welded to the top surface of the lower box body 1 in advance, and then the upper box body 2 is covered on the lower box body 1, and the top end of the screw rod 6 passes through the mounting hole 201 of the upper box body 2. Finally, a nut is screwed on the top end of the screw rod 6 and tightened until the nut is tightly pressed against the inner bottom wall of the countersunk hole of the mounting hole 201. In this way, the upper box body 2 is pressed down with the nut to fix the upper box body 2 tightly to the lower box body 1.

[0059] It should be noted that, due to the existence of the round rod 5, there will be no offset between the upper box body 2 and the lower box body 1 in the horizontal direction, thereby ensuring the stability between the upper box body 2 and the lower box body 1.

[0060] It should be noted that there is no specific limit on the number of nuts, for example, two or three nuts may be provided.

[0061] As the third type of reduction gearbox, the reduction gearbox housing in this embodiment is also manufactured by welding. Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the fasteners in the reduction gearbox housing of this embodiment are different from the fasteners used in the first reduction gearbox housing and the fasteners used in the second reduction gearbox housing.

[0062] Specifically, in this embodiment, the fastener includes at least one nut, an insert block 7 and a threaded rod 8, and the bottom ends of the insert block 7 and the threaded rod 8 are integrally formed.

[0063] like Figure 6 and Figure 8 As shown, a notch is opened on the side of the side plate of the lower box body 1, the notch corresponds to the mounting hole 201 one by one, the notch extends from the top surface of the lower box body 1 toward its bottom surface, the upper edge of the notch is connected to the top surface of the lower box body 1, and the side edge of the notch is connected to the side of the lower box body 1.

[0064] like Fig. 9 As shown, a stopper 10 is provided on the inner walls on both sides of the notch, the two stopper blocks 10 are of the same height, and the distance between the two stopper blocks 10 is greater than the diameter of the threaded rod 8. The space below the stopper block 10 of the notch becomes the bottom space, and the space above the stopper block 10 of the notch becomes the top space, and the bottom space is completely matched with the insert block 7.

[0065] When assembling the reducer housing, first insert the fastener into the notch on the side plate of the lower housing 1, so that the insert block 7 is embedded in the bottom space of the notch. At this time, the threaded rod 8 passes between the two limit blocks 10, and the top of the threaded rod 8 is higher than the lower housing 1. Then, the upper housing 2 is covered on the lower housing 1, and the top of the threaded rod 8 passes through the mounting hole 201 of the upper housing 2. Finally, a nut is screwed into the top of the threaded rod 8 and the nut is tightened so that the nut is tightly pressed against the inner bottom wall of the countersunk hole of the mounting hole 201.

[0066] This makes it easy to install and remove fasteners without fixing the threaded rod 8 to the lower box body 1. In addition, since it is no longer necessary to weld the box edges around the upper box body 2 and the lower box body 1, it can avoid the situation where there are many welds around the box edges and welding defects that easily cause oil leakage and seepage, thereby improving the sealing of the reduction box and increasing the service life of the reduction box.

[0067] Of course, there is no specific limit to the number of nuts.

[0068] In order to reduce the probability of nut falling off and improve the fastening effect of fasteners. Figure 6 , Fig.10 and Fig.11As shown, the top end of the threaded rod 8 has a rod body 801 coaxially arranged therewith, the diameter of the rod body 801 is smaller than the diameter of the threaded rod 8, the top end of the threaded rod 8 is provided with a first thread segment 802, and the rod body 801 is provided with a second thread segment 803, the thread directions of the first thread segment 802 and the second thread segment 803 are opposite, and two nuts are provided, namely a first nut 9 and a second nut 11, and the first nut 9 and the second nut 11 are respectively adapted to the first thread segment 802 and the second thread segment 803.

[0069] In this way, the first nut 9 can be passed through the second threaded section 803 and screwed into the first threaded section 802, and then the first nut 9 can be tightened so that the first nut 9 is tightly pressed against the inner bottom wall of the countersunk hole of the mounting hole 201. Next, the second nut 11 is screwed into the second threaded section 803 of the rod body 801 until the second nut 11 presses the first nut 9 tightly, which can effectively prevent the first nut 9 from being disengaged and improve the connection strength between the upper box body 2 and the lower box body 1.

[0070] Embodiment 2:

[0071] A second embodiment of the present invention provides a reduction gearbox, comprising any one of the reduction gearbox housings described above.

[0072] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0073] 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 an indirect connection through an intermediate medium, or it can be a connection between the insides 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. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reduction gearbox housing, characterized in that: The invention comprises an upper box body (2), a lower box body (1) and fasteners, wherein the upper box body (2) and the lower box body (1) are both boxes without box edges; the upper box body (2) comprises a side plate and a top plate welded together, and the lower box body (1) comprises a bottom plate and a side plate welded together; The upper box body (2) is provided with a plurality of mounting holes (201) corresponding one to one with the fasteners, the mounting holes (201) extending from the bottom surface of the upper box body (2) towards the top surface thereof and sequentially penetrating the side panels and the top panel of the upper box body (2); The mounting hole (201) comprises a countersunk hole and a straight hole that are connected, the countersunk hole is higher than the straight hole, and the diameter of the countersunk hole is larger than the diameter of the straight hole; A fastener is disposed in each of the mounting holes (201), and the fastener cooperates with the mounting hole (201) to fix the upper box body (2) and the lower box body (1); The lower box body (1) is provided with notches corresponding to the mounting holes (201) one by one, the notches extending from the top surface of the lower box body (1) towards the bottom surface thereof, the upper edge of the notches being connected to the top surface of the lower box body (1), and the side edges of the notches being connected to the side surfaces of the lower box body (1); The fastener comprises at least one nut, an insert block (7) and a threaded rod (8), wherein the insert block (7) is connected to one end of the threaded rod (8); a limit block (10) is provided on the inner walls of both sides of the notch, a gap is formed between the two limit blocks (10) for the threaded rod (8) to pass through, the notch comprises an upper space and a lower space which are connected to each other, the limit block (10) is located between the upper space and the lower space, and the lower space is adapted to the insert block (7); The insert block (7) is used to be inserted into the lower space, the threaded rod (8) passes through the upper space and the mounting hole (201) in sequence, the nut is threadedly connected to the threaded rod (8), and the nut is pressed against the inner bottom wall of the countersunk hole.

2. A reduction gearbox housing according to claim 1, characterized in that: A plurality of vertically arranged positioning shafts (4) are fixedly mounted on the top surface of the lower box body (1), and a plurality of positioning holes corresponding one to one with the positioning shafts (4) are provided on the lower half of the upper box body (2).

3. A reduction gearbox housing according to claim 1, characterized in that: The top end of the threaded rod (8) has a rod body (801) coaxially arranged therewith, the diameter of the rod body (801) is smaller than the diameter of the threaded rod (8), the top end of the threaded rod (8) is provided with a first thread segment (802), the rod body (801) is provided with a second thread segment (803), the thread directions of the first thread segment (802) and the second thread segment (803) are opposite, the nuts are provided with two, namely a first nut (9) and a second nut (11), the first nut (9) and the second nut (11) are respectively adapted to the first thread segment (802) and the second thread segment (803).

4. A reduction gearbox housing according to claim 1, characterized in that: At least four mounting holes (201) are provided, and the four mounting holes (201) are respectively located at the four corners of the upper box body (2).

5. A reduction gearbox, characterized in that: It comprises a reduction gear box body as described in any one of claims 1-4.

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