Low door bridge hub reduction gear and assembling method thereof

Abstract

The invention relates to a low door bridge hub reduction gear. The low door bridge hub reduction gear comprises a shell and a transmission mechanism arranged in the shell. The shell comprises a shell body with an inner cavity and a cover body, and an opening matched with the cover body is formed in the upper portion of the shell body so that the transmission mechanism can be placed into the inner cavity of the shell body from the opening. The shell has the advantages that the shell body is integrated, the upper portion of the shell body is open, a bearing and the like in an inner cavity of the shell body are matched with a machining face, one-time machining forming is achieved, and accuracy is higher; bearings and the like are assembled without crossing a plurality of shells, and the assembly precision of bearing clearance and the like is higher; and the transmission mechanism can be conveniently put into the shell body from the opening, so that the number of assembly shells is reduced, and the mold opening cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of reducers, in particular to a low-gate bridge wheel-side reducer and an assembly method thereof. Background Art

[0002] Compared with ordinary single-stage reduction axles, low-gate axles have a main reducer at one end of the axle and are equipped with wheel-side reducers. Therefore, the interior space of vehicles equipped with low-gate axles is wider and flatter, the chassis height is lower, and one can step into the vehicle with one step. The wheel-side reducer increases the rotation ratio, reduces speed and increases torque, improves driving efficiency, and reduces the vehicle chassis height by designing that the wheel center is higher than the power input shaft center.

[0003] In order to adapt to smaller wheels and have a high transmission ratio, the conventional approach is to optimize the spatial structure layout and assembly process of the wheel-side reducer.

[0004] For example, a split reducer housing is used, that is, the housing is divided into two housings on the left and right sides, and gears and other parts are assembled from the wheel-side reducer side. When operating in this way, the bearing fit position needs to span two or more parts to ensure the accuracy of its assembly gear, so this method has very high requirements for the precision of housing processing and assembly accuracy. Summary of the invention

[0005] The invention aims at the technical problems existing in the prior art and provides a low-gate bridge wheel-side reducer and an assembly method thereof.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: The first aspect of the present invention protects: a low-gate bridge wheel-side reducer, comprising: a housing and a transmission mechanism arranged in the housing; The shell comprises a shell body with an inner cavity and a cover body. The upper part of the shell body is provided with an opening matched with the cover body, so that the transmission mechanism can be placed into the inner cavity of the shell body through the opening.

[0007] As a further technical solution, a first inlet for the idler shaft to extend into and a second inlet for the shaft tube of the brake flange assembly to extend into are provided on one side of the shell body, and a third inlet is provided on the other side, and the first inlet, the second inlet and the third inlet are all connected to the inner cavity of the shell body; The first inlet and the third inlet are respectively located on two opposite walls of the shell body.

[0008] As a further technical solution, the transmission mechanism includes a driving wheel assembly, an idler wheel assembly, and a driven wheel assembly, wherein the driving wheel assembly is meshed with the idler wheel assembly, and the idler wheel assembly is meshed with the driven wheel assembly; The idler wheel shaft passes through the first inlet and is connected to the idler wheel assembly, and the shaft tube on the brake flange assembly extends into the second inlet and is connected to the driven wheel assembly.

[0009] As a further technical solution, the driving wheel assembly includes a transmission shaft with a driving cylindrical gear, a first bearing, and a locking plate. The transmission shaft is sleeved with the first bearing in the front and rear directions of the driving cylindrical gear, and the locking plate and the adjusting nut are sleeved on the end of the transmission shaft away from the shell body.

[0010] As a further technical solution, the idler assembly further includes a second bearing, a spacer sleeve, and an idler, the outer walls on both sides of the center axis of the spacer sleeve are connected to the second bearing, the spacer sleeve and the second bearing are both located in the idler, and the outer wall of the second bearing is interference fit with the idler; The idler shaft enters from the first inlet, passes through the spacer, and is bolted to the shell body; The idler wheel assembly is provided with two groups, and the shell body is provided with two first inlets, which are symmetrically located on both sides of the second inlet.

[0011] As a further technical solution, the driven wheel assembly includes a driven wheel, a third bearing, an outer ring of a fourth bearing, and a bearing seat, wherein the outer rings of the third bearing and the fourth bearing are both located on both sides of the central axis of the driven wheel and are interference fit with the driven wheel; The bearing seat is interference fit with the inner ring of the third bearing, and the end with a smaller outer diameter of the retainer of the third bearing is opposite to the end with a smaller outer diameter of the retainer of the fourth bearing; The third bearing and the fourth bearing are of the same size; the inner ring of the third bearing is interference fit with the shaft tube; the shaft tube on the brake flange assembly extends into the fourth bearing through the second inlet, the shaft tube is connected to the shell body by bolts, and the driven wheel is fixed in the inner cavity of the shell body by the shaft tube, the third bearing, the fourth bearing, and the bearing seat.

[0012] The second aspect of the present invention is to protect a method for assembling a low-gate bridge wheel reducer, comprising the following steps: S1. Prepare a shell: the shell body has an inner cavity and an opening on the upper part thereof adapted to be connected with the cover body, a first inlet and a second inlet are provided on one side wall, a third inlet is provided on the other side wall, and the first inlet and the third inlet are located on opposite side walls of the shell body; S2. Install the idler wheel assembly: place the assembled idler wheel assembly into the inner cavity of the housing body through the opening at the upper portion of the housing body, and make the idler wheel assembly face the first inlet; S3, fixing the idler assembly: inserting the idler shaft into the first inlet from direction a to insert into the idler assembly, and then using bolts to pass through the threaded holes on the shell body from direction b to fix the idler shaft, the idler shaft and the idler assembly are coaxially arranged; S4. Install the driving wheel assembly: extend the driving wheel assembly into the inner cavity of the shell body from the third entrance, and fix the driving wheel assembly in the shell body by adjusting the nut.

[0013] S5. Install the driven wheel assembly: place the assembled driven wheel assembly into the inner cavity of the shell body through the opening at the upper portion of the shell body, and make the driven wheel assembly face the second inlet; S6. Fix the driven wheel assembly: Use bolts to pass through the threaded holes on the shell body from direction b and fix the driven wheel assembly.

[0014] S7. Install the brake flange assembly: sleeve the inner ring with the retainer on the fourth shaft onto the shaft tube of the brake flange assembly, and then extend one end of the shaft tube into the second inlet to be coaxially connected to the driven wheel assembly; the brake flange assembly is connected and fixed to the shell body by bolts from direction a.

[0015] S8. Cover the cover on the opening of the shell body and fix it.

[0016] As a further technical solution, in step S2, the assembled idler assembly includes a second bearing, a spacer sleeve, and an idler; the idler assembly is provided with two sets, and is respectively located on both sides of the driven wheel assembly; In step S4, the driving wheel assembly includes a transmission shaft with a driving cylindrical gear, a first bearing, a locking plate, and an adjusting nut; a first bearing is placed in the housing cavity bearing matching position; the driving cylindrical gear is then placed in the housing cavity to match with the first bearing; then another first bearing and the adjusting nut are inserted into the transmission shaft, and the adjusting nut is tightened to axially limit the first bearing and the driving cylindrical gear; the locking plate is matched with the outer groove of the housing body and matched with the adjusting nut through a bolt; In step S5, the assembled driven wheel assembly includes the driven wheel, the third bearing, the outer ring of the fourth bearing, and the bearing seat.

[0017] As a further technical solution, the driving cylindrical gear is meshed with the idler gear, and the idler gear is meshed with the driven gear, so that the driving cylindrical gear drives the idler gear to rotate, and the rotation of the idler gear drives the driven gear to rotate; In step S5, when the driven wheel assembly is assembled, the third bearing and the fourth bearing are both located on both sides of the central axis of the driven wheel and are interference fit with the driven wheel; the end with a smaller outer diameter of the retainer of the third bearing is opposite to the end with a smaller outer diameter of the retainer of the fourth bearing.

[0018] As a further technical solution, in step S4, before installing the driving wheel assembly, the fifth bearing is first installed outside the third inlet of the shell body, and the fifth bearing is coaxially arranged with the driving wheel assembly.

[0019] The beneficial effects of the present invention are: 1. The shell body is an integrated design with an upper opening. The bearing and other matching processing surfaces in the inner cavity of the shell body are formed in one step, which has higher precision. It is also convenient for the transmission mechanism to be placed in the shell body from the opening, which reduces the number of assembly shells and reduces the mold opening cost. 2. The structural design of the first inlet, the second inlet, the third inlet and the opening on the shell body facilitates the installation of the transmission mechanism and reduces the number of shells for assembly and matching of the driven wheel, the driving wheel, the idler wheel, the bearing, etc. in the transmission mechanism; thereby improving the matching accuracy of the driven wheel, the driving wheel, the idler wheel and the bearing in the transmission mechanism, and ensuring the accuracy of the installation of the bearing, the driven gear, the driving gear, the idler wheel, etc.; 3. Use the adjusting nut to adjust the clearance between the two first bearings and the driving cylindrical gear on the transmission shaft, which increases the service life of the first bearing on the transmission shaft; 4. When assembling the driven wheel assembly, the design method in which the end with a smaller outer diameter of the retainer of the third bearing is opposite to the end with a smaller outer diameter of the retainer of the fourth bearing can reduce the spatial size of the matching between the bearing and the gear, thereby optimizing the spatial layout inside the housing.

[0020] 5. The assembly method of the present invention uses an integrated shell body structure with an opening at the top to install the idler wheel assembly, the driving wheel assembly, and the driven wheel assembly in sequence, and the idler wheel assembly and the driven wheel assembly enter the shell body from the opening. This assembly method makes the dimensional matching accuracy of the gears, bearings, etc. in each structure higher, providing a strong guarantee for the accuracy of subsequent installation; at the same time, it optimizes the internal space layout of the reducer, making the internal structure of the reducer more compact, for example, providing a larger and flatter internal space for the entire bus. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the exploded structure of a low-gate bridge wheel-side reducer of the present invention; Figure 2 A schematic diagram of a low-gate bridge wheel-side reducer of the present invention from a perspective b; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure from the middle AA perspective; Figure 4 It is a side view structural schematic diagram of a low-gate bridge wheel-side reducer of the present invention; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure from the CC perspective; Figure 6It is a schematic diagram of the shell body structure; Figure 7 This is a schematic diagram of the explosion structure when the outer ring of the fourth bearing is detached.

[0022] In the accompanying drawings, the components represented by the reference numerals are listed as follows: Shell body 1, opening 11, first inlet 12, second inlet 13, third inlet 14; Cover 2; Brake flange assembly 3, shaft tube 31; Driving wheel assembly 4, transmission shaft 41, driving cylindrical gear 411, first bearing 42, locking plate 43, annular connecting member 44; Idler wheel assembly 5, idler wheel shaft 51, second bearing 52, spacer sleeve 53, idler wheel 54; Driven wheel assembly 6, driven wheel 61, third bearing 62, fourth bearing 63, outer ring 63A, inner ring 63B, bearing seat 64; Bolt 7, fifth bearing sleeve 8, boss 9. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0024] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise clearly and specifically defined.

[0025] In the description of the present application, the term "for example" is used to mean "used as an example, illustration or description". Any embodiment described as "for example" in the present application is not necessarily to be construed as being more preferred or advantageous than other embodiments. In order to enable any technician in the field to implement and use the present invention, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present invention can be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present invention obscure. Therefore, the present invention is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in the present application.

[0026] Example 1 To ensure the accuracy of the assembled gear, see Figure 1-Figure 5 This embodiment provides a low-gate bridge wheel-side reducer, including a shell and a transmission mechanism arranged in the shell; the shell includes an integrated shell body 1 with an inner cavity and a cover body 2, and the upper part of the shell body 1 is provided with an opening 11 adapted to the cover body 2, so that the transmission mechanism can be placed into the inner cavity of the shell body 1 through the opening 11.

[0027] It should be noted that: See Figure 1 , Figure 6 The transmission mechanism includes input and output transmission structures; the shell body 1 adopts an integrated structural design, which cooperates with the upper opening 11. On the one hand, it reduces the number of assembly shells and effectively reduces the cost of mold opening. On the other hand, the internal bearings, gears and other matching dimensions of the integrated shell body are processed and formed at one time, with higher precision; the input, output and other structural assemblies in the transmission mechanism involve fewer shells, which improves the assembly accuracy.

[0028] It can be explained that the cover body 2 is connected to the opening 11 of the shell body 1 by screws, or by hinges or other connections, so that the transmission mechanism is easy to install. The specific connection method is selected according to actual needs.

[0029] Further, see Figure 1 , a plurality of screws are provided on the edge of the upper opening 11 of the shell body 1 to match with the screws on the cover body 2 , and the cover body 2 is lifted by hand to separate it from the shell body 1 .

[0030] In the specific implementation process, for the convenience of assembly, see Figure 1 , Figure 6 A first inlet 12 for the idler shaft 51 to extend into and a second inlet 13 for the shaft tube 31 of the brake flange assembly 3 to extend into are provided on one side of the shell body 1, and a third inlet 14 is provided on the other side. The first inlet 12, the second inlet 13 and the third inlet 14 are all connected to the inner cavity of the shell body 1, so that the transmission mechanism is connected to the corresponding inlet after being placed, and the assembly status can be easily checked. This structural design makes the shell body 1 smaller in space, with a regular appearance and structure, and is also convenient for subsequent layout and integration.

[0031] The first inlet 12 and the third inlet 14 are respectively located on two opposite walls of the shell body 1 .

[0032] During work, see Figure 1 , Figure 3 , Figure 5The transmission mechanism includes a driving wheel assembly 4, an idler wheel assembly 5, and a driven wheel assembly 6. The driving wheel assembly 4 is meshed with the idler wheel assembly 5, and the idler wheel assembly 5 is meshed with the driven wheel assembly 6, so that the driving wheel assembly 4 drives the idler wheel assembly 5 to rotate after being driven, and the rotation of the idler wheel assembly 5 drives the rotation of the driven wheel assembly 6. It should be noted that there is no direct transmission between the driving wheel assembly 4 and the driven wheel assembly 6.

[0033] The idler shaft 51 passes through the first inlet 12 and is connected to the idler assembly 5 , so that the idler assembly 5 and the idler shaft 51 rotate coaxially; the shaft tube 31 on the brake flange assembly 3 extends into the second inlet 13 and is connected to the driven wheel assembly 6 .

[0034] Specifically, see Figure 1 , Figure 3 , Figure 5 The driving wheel assembly 4 includes a transmission shaft 41 with a driving cylindrical gear 411, a first bearing 42, a locking piece 43, and an adjusting nut 44. The transmission shaft 41 is provided with a first bearing 42 in the front and rear directions of the driving cylindrical gear 411, and the first bearing 42 and the driving cylindrical gear 411 are clearance-matched. At the same time, the first bearing 42 and the shell body 1 are also clearance-matched to improve the stability of assembly. The locking piece 43 and the adjusting nut 43 are both sleeved on the end of the transmission shaft 41 away from the shell body 1, and the driving wheel assembly 4 is axially limited in the inner cavity of the shell body 1. The preload force of the first bearing 42 is adjusted by tightening the adjusting nut 44. The locking piece 43 cooperates with the groove outside the shell body 1, and is fixed with the adjusting nut 44 by the bolt 7 to limit the rotation and retreat of the adjusting nut 44. The structure adjusts the preload force of the bearing 42 by adjusting the adjusting nut 44, thereby increasing the service life of the bearing 42; and improves the stability of the reducer structure, thereby extending its service life; and because the installation directions of the bolts 7 connecting the internal structure of the cavity are all outside the shell body 1, this structural method is convenient for disassembly, assembly and maintenance.

[0035] Specifically, see Figure 1 , Figure 3 , Figure 5The idler assembly 5 also includes a second bearing 52, a spacer sleeve 53, and an idler 54. The outer walls on both sides of the central axis of the spacer sleeve 53 are connected to the second bearing 52. The spacer sleeve 53 and the second bearing 52 are both located in the idler 54, and the outer wall of the second bearing 52 is interference fit with the idler 54, thereby improving the assembly accuracy and stability among the second bearing 52, the spacer sleeve 53, and the idler 54; the idler shaft 51 enters from the first inlet 12 and passes through the spacer sleeve 53 to be connected with the bolt 7 of the shell body 1; the idler assembly 5 is provided with two groups, and two first inlets 12 are provided on the shell body 1, and are symmetrically located on both sides of the second inlet 13, so that the two idler wheels 54 simultaneously drive one driven wheel assembly 6 to rotate, thereby improving the transmission torque; the driving cylindrical gear 411 is meshed with the idler wheel 54 to drive the idler wheel 54 to rotate.

[0036] Specifically, see Figure 1 , Figure 3 , Figure 5 , Figure 7 The driven wheel assembly 6 includes a driven wheel 61, a third bearing 62, an outer ring 63A of a fourth bearing 63, and a bearing seat 64. The outer rings 63A of the third bearing 62 and the fourth bearing 63 are both located on both sides of the central axis of the driven wheel 61 and are interference fit with the driven wheel 61; the bearing seat 64 is interference fit with the inner ring of the third bearing 62, and the end with a smaller outer diameter of the retainer of the third bearing 62 is opposite to the end with a smaller outer diameter of the retainer of the fourth bearing 63, thereby reducing the contact between the driven wheel 61 and the third bearing 62 and the fourth bearing 63. 3 and other structures are installed in coordination with the spatial dimensions, optimizing the spatial layout in the shell body 1; it can be explained that: the third bearing 62 and the fourth bearing 63 are of the same size; the inner ring 63B of the third bearing is interference fit with the shaft tube; the shaft tube 31 on the brake flange assembly 3 extends into the outer ring 63A of the fourth bearing 63 through the second inlet 13, and the shaft tube 3 is connected to the shell body 1 by bolts; the driven wheel 61 is fixed in the inner cavity of the shell body 1 by the shaft tube 3, the third bearing 62, the fourth bearing 63, and the bearing seat 64.

[0037] In this embodiment, the number of teeth of the driving cylindrical gear 411, the idler gear 54, and the driven gear 61 is selected according to specific needs. For example, the number of teeth of the driving cylindrical gear 411, the idler gear 54, and the driven gear 61 may be twenty-two, sixty-nine, and fifty-four, respectively.

[0038] The brake flange assembly 3 is an integrated shaft tube brake flange, that is, the shaft tube 31 and the brake flange are of an integrated structural design.

[0039] The structural design of this embodiment reduces the number of assembly housings, reduces mold opening costs, and ensures the accuracy of transmission mechanism installation.

[0040] Example 2 Under the requirement of reducing the processing precision and assembly accuracy of the housing, in order to improve the assembly precision and assembly efficiency, this embodiment provides an assembly method of a low-gate bridge wheel-side reducer, comprising the following steps: S1. Prepare a shell: the shell body 1 has an inner cavity and an opening 11 is provided on the upper part thereof to be matched with the cover body 2, a first inlet 12 and a second inlet 13 are provided on one side wall, and a third inlet 14 is provided on the other side wall, and the first inlet 12 and the third inlet 14 are located on opposite side walls of the shell body 1; S2. Install the idler assembly 5: Place the assembled idler assembly 5 into the inner cavity of the housing body 1 through the opening 11 at the upper portion thereof, and make the idler assembly 5 face the first inlet 12; S3, fixing the idler assembly 5: insert the idler shaft 51 into the first inlet 12 from direction a to be inserted into the idler assembly 5, and then use the bolt 7 to pass through the threaded hole on the shell body 1 from direction b to fix the idler shaft 51, and the idler shaft 51 is coaxially arranged with the idler assembly 5; S4, installing the driving wheel assembly 4: the driving wheel assembly 4 extends into the inner cavity of the shell body 1 from the third inlet 14, and the driving wheel assembly 4 is axially limited in the shell body 1 by adjusting the nut 44; S5. Install the driven wheel assembly 6: Place the assembled driven wheel assembly 6 into the inner cavity of the housing body 1 through the opening 11 at the upper portion thereof, and make the driven wheel assembly 6 face the second inlet 13; S6, fixing the driven wheel assembly 6: using bolts 7 to pass through the threaded holes on the shell body 1 from direction b to fix the driven wheel assembly 6; S7. Install the brake flange assembly 3: sleeve the inner ring 63B with the retainer on the fourth bearing 63 onto the shaft tube 31 of the brake flange assembly 3, and then extend one end of the shaft tube 31 into the second inlet 13 to be coaxially connected to the driven wheel assembly 6; the brake flange assembly 3 is connected and fixed to the shell body 1 by bolts from direction a.

[0041] S8. Cover the cover 2 on the opening 11 of the shell body 1 and fix it.

[0042] In the above assembly process: Step S2, the assembled idler assembly 5 includes a second bearing 52, a spacer sleeve 53, and an idler 54; the idler assembly 5 is provided with two sets, and is respectively located on both sides of the driven wheel assembly 6; The assembly process of the idler assembly 5 is as follows: A second bearing 52 , a spacer sleeve 53 , and a second bearing 52 are sequentially connected to the idler wheel 54 , and the two second bearings 52 , the spacer sleeve 53 , and the idler wheel 54 are coaxial. At the same time, the two second bearings 52 are interference fit with the idler wheel 54 along the central axis direction.

[0043] Step S4, the assembled driving wheel assembly 4 includes a transmission shaft 41 with a driving cylindrical gear 411, a first bearing 42, an adjusting nut 44, and a locking plate 43; The assembly process of the driving wheel assembly 4 is as follows: First, the fifth bearing sleeve 8 can be arranged on the boss 9 on the outer side of the third inlet 14 on the shell body 1, and then a first bearing 42 can be placed in the shell cavity bearing matching position; then the active cylindrical gear 41 can be placed in the cavity of the shell body 1 to match with the first bearing 42; then another first bearing 42 and the adjustment nut 44 can be inserted into the transmission shaft 411, and the adjustment nut 44 can be tightened to axially limit the first bearing 42 and the active cylindrical gear 411; the locking plate 43 can be matched with the outer groove of the shell body 1, and can be matched with the adjustment nut 44 through the bolt 7 to prevent the adjustment nut 44 from rotating and retreating. (It can be explained that the transmission shaft 41, the fifth bearing, the first bearing 42, the active cylindrical gear 411, and the locking plate 43 are coaxially arranged); The gap between the two first bearings 42 can be adjusted by the nut on the locking plate 43. It should be noted that, in order to limit the axial position of the driving wheel assembly 4 in the cavity of the shell body 1, the driving wheel assembly 4 also includes an adjusting nut 44. The adjusting nut 44 is provided with a plurality of holes along its circumferential direction, so that the bolts pass through the holes to lock and fix it to the shell body 1. The adjusting nut 44 is sleeved on the transmission shaft 41 and is located between the locking plate 43 and the adjacent first bearing 42.

[0044] Furthermore, the adjusting nut 44 is coaxially arranged with the transmission shaft 41 .

[0045] Step S5, the assembled driven wheel assembly 6 includes the driven wheel 61, the third bearing 62, the outer ring 63A of the fourth bearing 63, and the bearing seat 64. It should be noted that the driving cylindrical gear 411 is meshed with the idler wheel 54, and the idler wheel 54 is meshed with the driven wheel 61, so that the driving cylindrical gear 411 drives the idler wheel 54 to rotate, and the rotation of the idler wheel 54 drives the driven wheel 61 to rotate; The assembly process of the driven wheel assembly 6 is as follows: The outer rings of the third bearing 62 and the fourth bearing 63 are both interference fit with the driven wheel 61. It should be noted that the end with a smaller outer diameter of the retaining frame of the third bearing 62 is opposite to the end with a smaller outer diameter of the retaining frame of the fourth bearing 63, and are arranged along both sides of the driven wheel 61, so that the third bearing 62, the fourth bearing 63 and the driven wheel 61 share a common central axis; then the inner ring of the third bearing 62 is interference fit with the bearing seat 64.

[0046] In the present invention, the shapes and sizes of the first bearing 42, the second bearing 52, the third bearing 62, the fourth bearing 63 and the fifth bearing sleeve 8 are set according to requirements.

[0047] In this embodiment, the assembly structure is as follows Figure 1-Figure 6 As shown; This assembly method uses an integrated shell body structure with an upper opening to sequentially install the idler wheel assembly, the driving wheel assembly, and the driven wheel assembly, thereby achieving higher matching accuracy of the structural dimensions and providing a strong guarantee for the accuracy of subsequent installation.

[0048] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0049] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A low-gate bridge wheel reducer, characterized in that: It includes a housing and a transmission mechanism arranged in the housing; The shell comprises an integrated shell body (1) with an inner cavity and a cover body (2); an opening (11) adapted to the cover body (2) is provided on the upper portion of the shell body (1), so that the transmission mechanism can be placed into the inner cavity of the shell body (1) through the opening (11).

2. A low-gate bridge wheel reducer according to claim 1, characterized in that: The shell body (1) has a first inlet (12) for the idler shaft (51) to extend into and a second inlet (13) for the shaft tube (31) of the brake flange assembly (3) to extend into on one side, and a third inlet (14) on the other side, and the first inlet (12), the second inlet (13) and the third inlet (14) are all in communication with the inner cavity of the shell body (1); The first inlet (12) and the third inlet (14) are respectively located on two opposite walls of the shell body (1).

3. A low-gate bridge wheel reducer according to claim 2, characterized in that: The transmission mechanism comprises a driving wheel assembly (4), an idler wheel assembly (5), and a driven wheel assembly (6); the driving wheel assembly (4) is meshed with the idler wheel assembly (5), and the idler wheel assembly (5) is meshed with the driven wheel assembly (6); The idler wheel shaft (51) passes through the first inlet (12) to be connected to the idler wheel assembly (5), and the shaft tube (31) on the brake flange assembly (3) extends into the second inlet (13) to be connected to the driven wheel assembly (6).

4. A low-gate bridge wheel reducer according to claim 3, characterized in that: The driving wheel assembly (4) comprises a transmission shaft (41) with a driving cylindrical gear (411), a first bearing (42), a locking plate (43), and an adjusting nut (44); the transmission shaft (41) is sleeved with the first bearing (42) in the front and rear directions of the driving cylindrical gear (411); the locking plate (43) and the adjusting nut (44) are sleeved on an end of the transmission shaft (41) away from the shell body (1).

5. The low-gate bridge wheel reducer according to claim 3, characterized in that: The idler wheel assembly (5) further comprises a second bearing (52), a spacer sleeve (53), and an idler wheel (54); outer walls on both sides of a central axis of the spacer sleeve (53) are connected to the second bearing (52); the spacer sleeve (53) and the second bearing (52) are both located inside the idler wheel (54); and an outer wall of the second bearing (52) is interference fit with the idler wheel (54); The idler shaft (51) enters from the first inlet (12), passes through the idler assembly (5), and is bolted to the housing body (1); The idler wheel assembly (5) is provided with two groups, and the housing body (1) is provided with two first inlets (12) which are symmetrically located on both sides of the second inlet (13).

6. A low-gate bridge wheel reducer according to claim 3, characterized in that: The driven wheel assembly (6) comprises a driven wheel (61), a third bearing (62), an outer ring (63A) of a fourth bearing (63), and a bearing seat (64); the outer rings (63A) of the third bearing (62) and the fourth bearing (63) are both located on both sides of the central axis of the driven wheel (61) and are interference fit with the driven wheel (61); The bearing seat (64) is interference fit with the inner ring of the third bearing (62), and the end with a smaller outer diameter of the retainer of the third bearing (62) is opposite to the end with a smaller outer diameter of the retainer of the fourth bearing (63); The third bearing (62) and the fourth bearing (63) are of the same size; the inner ring (63B) of the third bearing (63) is interference fit with the shaft tube (3); the shaft tube (31) on the brake flange assembly (3) extends into the outer ring (63A) of the fourth bearing (63) through the second inlet (13); the brake flange assembly (3) is connected to the shell body (1) by bolts; the driven wheel (61) is fixed in the inner cavity of the shell body (1) by the shaft tube (3), the third bearing (62), the fourth bearing (63) and the bearing seat (64).

7. A method for assembling a low-gate bridge wheel reducer, characterized in that: The steps include: S1. Prepare a shell: the shell body (1) has an inner cavity and an opening (11) on the upper portion thereof adapted to be connected to the cover body (2); a first inlet (12) and a second inlet (13) are provided on one side wall; a third inlet (14) is provided on the other side wall; and the first inlet (12) and the third inlet (14) are located on opposite side walls of the shell body (1); S2. Installing the idler wheel assembly (5): placing the assembled idler wheel assembly (5) into the inner cavity of the housing body (1) through the opening (11) at the upper portion thereof, and making the idler wheel assembly (5) face the first inlet (12); S3, fixing the idler assembly (5): inserting the idler shaft (51) into the first inlet (12) from direction a to insert into the idler assembly (5), and then using a bolt (7) to pass through the threaded hole on the shell body (1) from direction b to fix the idler shaft (51), the idler shaft (51) being coaxially arranged with the idler assembly (5); S4. Installing the driving wheel assembly (4): the driving wheel assembly (4) extends into the inner cavity of the shell body (1) from the third inlet (14), and the driving wheel assembly (4) is axially limited in the shell body (1) by adjusting the nut (44); S5. Installing the driven wheel assembly (6): placing the assembled driven wheel assembly (6) into the inner cavity of the housing body (1) through the opening (11) at the upper portion thereof, and making the driven wheel assembly (6) face the second inlet (13); S6. Fixing the driven wheel assembly (6): Use bolts (7) to pass through the threaded holes on the housing body (1) from direction b to fix the driven wheel assembly (6); S7. Install the brake flange assembly (3): sleeve the inner ring (63B) with the retainer on the fourth bearing (63) onto the shaft tube (31) of the brake flange assembly (3), and then extend one end of the shaft tube (31) into the second inlet (13) to be coaxially connected to the driven wheel assembly (6); the brake flange assembly (3) is connected and fixed to the housing body (1) by bolts from direction a. S8. Cover the cover body (2) on the opening (11) of the shell body (1) and fix it.

8. The assembly method according to claim 7, characterized in that: In step S2, the assembled idler wheel assembly (5) comprises a second bearing (52), a spacer sleeve (53), and an idler wheel (54); the idler wheel assembly (5) is provided with two sets, and is respectively located on both sides of the driven wheel assembly (6); In step S4, the driving wheel assembly (4) comprises a transmission shaft (41) with a driving cylindrical gear (411), a first bearing (42), a locking plate (43), and an adjusting nut (44); during installation, one first bearing (42) is placed in the housing cavity bearing matching position; then the driving cylindrical gear (41) is placed in the cavity of the housing body (1) to match with the first bearing (42); then another first bearing (42) and the adjusting nut (44) are inserted into the transmission shaft (411), and the adjusting nut (44) is tightened to axially limit the first bearing (42) and the driving cylindrical gear (411); the locking plate (43) is matched with the outer groove of the housing body (1), and is matched with the adjusting nut (44) through the bolt (7); In step S5, the assembled driven wheel assembly (6) comprises a driven wheel (61), a third bearing (62), an outer ring (63A) of a fourth bearing (63), and a bearing seat (64).

9. The assembly method according to claim 8, characterized in that: The driving cylindrical gear (411) is meshed with the idler gear (54), and the idler gear (54) is meshed with the driven gear (61), so that the driving cylindrical gear (411) drives the idler gear (54) to rotate, and the rotation of the idler gear (54) drives the driven gear (61) to rotate; In step S5, when the driven wheel assembly (6) is assembled, the third bearing (62) and the fourth bearing (63) are both located on both sides of the central axis of the driven wheel (61) and are interference fit with the driven wheel (61); and the end with a smaller outer diameter of the retainer of the third bearing (62) is opposite to the end with a smaller outer diameter of the retainer of the fourth bearing (63).

10. The assembly method according to claim 7, characterized in that: In step S4, before installing the driving wheel assembly (4), the fifth bearing (8) is first installed outside the third inlet (14) of the shell body (1), and the fifth bearing (8) is coaxially arranged with the driving wheel assembly (4).

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