A drive axle main cone assembly for a small loader

Abstract

This utility model discloses a main cone assembly for a drive axle of a small loader, belonging to the technical field of loader drive axle. It includes a housing, within which a drive bevel gear is installed. The drive bevel gear includes a cone rod, one end of which is connected to an input flange. A first cone bearing and a second cone bearing are installed between the cone rod and the inner wall of the housing. Between the two cone bearings, two flexible washers are provided, each with elasticity. Each flexible washer includes an elastic ring, one end of which abuts against the cone bearing, and the other end of which is fixed to a connecting ring. A locking nut is threaded onto the cone rod between the second cone bearing and the input flange. A locking washer is installed between the locking nut and the second cone bearing. The preload of the first and second cone bearings is controlled by two tensioned flexible washers, requiring only the tightening torque of the locking nut to be controlled, eliminating the need to select and adjust spacers of different specifications, thus facilitating assembly. The geometry of a single flexible washer is also simplified, making it easier to manufacture.

Description

Technical Field

[0001] This utility model belongs to the field of loader drive axle technology, specifically relating to a drive axle main cone assembly for a small loader. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] Due to their favorable operating conditions, small loaders have sufficient torque transmission capacity in their drive system. The main reduction gear and wheel-side gear of the drive axle have a relatively longer lifespan compared to medium and large loaders. Therefore, higher requirements are placed on the sealing and bearings of the drive axle.

[0004] The prior art discloses a drive axle main reducer, including a drive bevel gear, a first bearing and a second bearing disposed between the drive bevel gear and the housing, and a spacer disposed between the two bearings to adjust the bearing clearance; a fastening sealing layer is disposed at the spline and thread of the drive bevel gear, and an O-ring is disposed between the flange assembly and the lock nut, thereby preventing oil leakage from the spline.

[0005] The above solution has the following problems: A spacer is set between the first bearing and the second bearing to adjust the bearing clearance. When the adjustment is not in place, the drive bevel gear needs to be removed from the housing and a spacer of a different specification needs to be selected for adjustment. The adjustment process is cumbersome and the assembly efficiency is low. Utility Model Content

[0006] In view of this, this utility model discloses a drive axle main cone assembly for a small loader, which solves the technical problem in the prior art that when the adjustment is not in place, the drive bevel gear needs to be removed from the housing for readjustment, which is a cumbersome adjustment process and has low assembly efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A drive axle main cone assembly for a small loader is provided, including a housing, an active bevel gear installed inside the housing, the active bevel gear including a cone rod, one end of the cone rod having a fixed bevel tooth, and the other end being connected to an input flange; A first tapered bearing and a second tapered bearing are installed between the tapered rod and the inner wall of the housing; Two flexible washers of the same size that abut against each other are provided between the first tapered bearing and the second tapered bearing. Both the first flexible washer and the second flexible washer are elastic. A flexible washer is installed on the outer periphery of the tapered rod, including an elastic ring. One end of the elastic ring abuts against the first tapered bearing or the second tapered bearing, and the other end is fixed to the connecting ring. A lock nut is threaded onto the tapered rod between the second tapered bearing and the input flange, and a locking washer is installed between the lock nut and the second tapered bearing.

[0008] Preferably, the first tapered bearing is located near one end of the tapered tooth, and the second tapered bearing is located on the side of the first tapered bearing away from the tapered tooth.

[0009] Preferably, both the first tapered bearing and the second tapered bearing are tapered roller bearings.

[0010] Preferably, a first step facing the direction of the bevel teeth is provided on the inner wall of the housing, the outer ring of the first cone bearing abuts against the first step, and the inner ring is interference-fitted with the cone rod.

[0011] Preferably, a second step facing the input flange is provided on the inner wall of the housing, the outer ring of the second tapered bearing abuts against the second step, and the inner ring transitions into the tapered rod.

[0012] Preferably, the bevel teeth of the driving bevel gear mesh with the bevel teeth of the driven bevel gear, and an imprint adjustment shim is provided between the first bevel bearing and the first step to adjust the contact area between the bevel teeth of the driving bevel gear and the bevel teeth of the driven bevel gear.

[0013] Preferably, an oil seal is provided between the input flange and the housing, a retaining ring is fixed on the outer periphery of the input flange, the retaining ring is located inside the housing, and there is a gap between the retaining ring and the housing.

[0014] Preferably, the input flange and the driving bevel gear are coaxially arranged, and a spline section is provided at the end of the cone rod of the driving bevel gear away from the bevel teeth, which is internally connected to the input flange through the spline section.

[0015] Preferably, a third step is provided inside the input flange facing the bevel teeth, and a fourth step is provided on the drive bevel gear facing the input flange. The fourth step is located on the side of the locking nut away from the bevel teeth; the fourth step and the third step cooperate to form a stop positioning structure.

[0016] Preferably, the input flange has a first inclined step facing the direction of the conical teeth inside, the spline section is set on the conical rod on the side of the first inclined step away from the third step, and a reducing section is set on the conical rod between the third step and the first inclined step; an O-ring is set near the first inclined step on the reducing section, and a fastening sealing layer is set in the gap between the end of the conical rod and the input flange.

[0017] Compared with the prior art, the advantages and positive effects of this utility model are: This invention uses two flexible washers of the same size that abut against each other between the first and second tapered bearings. The preload of the first and second tapered bearings is controlled by the two tensioned flexible washers. Only the tightening torque of the lock nut needs to be controlled, eliminating the need to remove the drive bevel gear from the housing for readjustment. It also eliminates the need for selecting and adjusting spacers of different specifications in existing technologies, making assembly easier. The self-adjusting function keeps the preload of the first and second tapered bearings stable, improving the service life of the tapered bearings. When manufacturing the flexible washers, only the connecting ring and the elastic ring need to be machined for each flexible washer. Compared to machining two flexible washers into one, the geometry of a single flexible washer is relatively simpler, thus reducing the machining complexity and technical difficulty of a single flexible washer. Furthermore, during maintenance, only the worn individual flexible washer needs to be replaced.

[0018] This utility model also provides a fastening sealing layer and an O-ring at both ends of the spline section connecting the active bevel gear and the input flange, forming a seal on both the upper and lower sides of the spline section, reducing the probability of oil leakage failure at the input end of the active bevel gear (the end connected to the input flange) and improving reliability; the input flange and the active bevel gear 1 are coaxial through a stop positioning structure to avoid radial movement that could damage the oil seal. Attached Figure Description

[0019] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0020] Figure 1 This is a cross-sectional view of the drive axle main cone assembly for a small loader according to an embodiment of the present invention; Figure 2 This is a partial enlarged cross-sectional view of the drive axle main cone assembly for a small loader according to an embodiment of the present invention; In the picture: 1. Drive bevel gear; 2. First bevel bearing; 3. Imprint adjustment shim; 4. First flexible washer; 5. Second flexible washer; 6. Second bevel bearing; 7. Locking washer; 8. Locking nut; 9. Housing; 10. Oil seal; 11. O-ring seal; 12. Input flange. Detailed Implementation

[0021] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] This embodiment discloses a drive axle main cone assembly for a small loader, such as... Figure 1 As shown, the device includes a housing 9, inside which a driving bevel gear 1 is installed. The driving bevel gear 1 includes a cone rod and bevel teeth. The bevel teeth of the driving bevel gear 1 are used to mesh with the bevel teeth of the driven bevel gear. One end of the cone rod of the driving bevel gear 1 is fixedly connected to the bevel teeth of the driving bevel gear 1, and the other end is connected to the input flange 12. A first cone bearing 2 and a second cone bearing 6 are installed between the cone rod of the driving bevel gear 1 and the inner wall of the housing 9.

[0024] like Figure 1 As shown, two flexible washers of the same size are provided between the first tapered bearing 2 and the second tapered bearing 6, and they abut against each other. The flexible washer 4 is located on the side of the first tapered bearing 2 facing the second tapered bearing 6, and the flexible washer 5 is located on the side of the second tapered bearing 6 facing the first tapered bearing 2. Both the first flexible washer 4 and the second flexible washer 5 are elastic and can undergo elastic deformation.

[0025] Specifically, such as Figure 1 As shown, a flexible washer is installed on the outer periphery of the tapered rod, including an elastic ring. One end of the elastic ring abuts against the first tapered bearing 2 or the second tapered bearing 6, and the other end is fixed to a connecting ring. The connecting rings of the first flexible washer 4 and the second flexible washer 5 are arranged opposite each other and abut together. It can be understood that the first flexible washer 4 and the second flexible washer 5 are arranged opposite each other between the first tapered bearing 2 and the second tapered bearing 6. When the second tapered bearing 6 applies a preload downward, the first flexible washer 4 and the second flexible washer 5 undergo elastic deformation, thereby "storing" the preload.

[0026] In this embodiment, as Figure 1 As shown, a locking nut 8 is threaded onto the tapered rod between the second tapered bearing 6 and the input flange 12, and a locking washer 7 is installed between the locking nut 8 and the second tapered bearing 6. By tightening the locking nut 8, a preload is applied, causing the second tapered bearing 6 to transmit the preload towards the first tapered bearing 2, causing the first flexible washer 4 and the second flexible washer 5 to undergo elastic deformation, thereby "storing" the preload.

[0027] In this embodiment, when wear occurs in the components of the drive axle during operation, the preload stored in the first flexible washer 4 and the second flexible washer 5 is released. The first flexible washer 4 and the second flexible washer 5 are always in contact between the first tapered bearing 2 and the second tapered bearing 6, causing the second tapered bearing 6 to push upward against the locking washer 7, eliminating the gap caused by wear. This effectively solves the problem of reduced bearing preload torque due to wear during the operation of the drive axle, and improves the service life of the bearings. By setting two flexible washers of the same size that are in contact with each other between the first and second tapered bearings, the preload of the first and second tapered bearings is controlled by the two flexible washers with tension. It is not necessary to remove the drive bevel gear from the housing for readjustment; only the tightening torque of the locking nut needs to be controlled. It also eliminates the need to select and adjust spacers of different specifications in the prior art, which facilitates assembly. The self-adjusting function can keep the preload of the first and second tapered bearings stable and improve the service life of the tapered bearings.

[0028] It should also be noted that in this embodiment, two flexible washers of the same size that abut against each other are provided between the first tapered bearing 2 and the second tapered bearing 6, which also facilitates processing. Because when manufacturing flexible washers, only the connecting ring and the elastic ring need to be machined for each flexible washer. Compared to machining two flexible washers into one, the geometry of a single flexible washer is relatively simpler, thereby reducing the processing complexity and technical difficulty of a single flexible washer; and during maintenance, only the worn individual flexible washer needs to be replaced.

[0029] In this embodiment, one end of the cone rod of the driving bevel gear 1 is connected to the bevel teeth, and the other end is connected to the input flange 12. The power from the drive shaft of the power system is transmitted to the cone rod of the driving bevel gear 1 through the input flange 12, and then to the bevel teeth and the driven bevel gear.

[0030] like Figure 1 As shown, the first tapered bearing 2 is disposed near the tapered tooth end of the driving bevel gear 1, and the second tapered bearing 6 is disposed on the side of the first tapered bearing 2 away from the tapered tooth of the driving bevel gear 1. In this embodiment, both the first tapered bearing 2 and the second tapered bearing 6 are tapered roller bearings, each including an inner ring and an outer ring, wherein the inner ring is connected to the tapered rod of the driving bevel gear 1, and the outer ring is connected to the inner wall of the housing 9.

[0031] Specifically, such as Figure 1 As shown, a first step facing the bevel gear is provided on the inner wall of the housing 9. The outer ring of the first tapered bearing 2 abuts against the first step, and the inner ring of the first tapered bearing 2 is interference-fitted with the tapered rod to transmit torque. Figure 1As shown, a second step facing the input flange 12 is also provided on the inner wall of the housing 9. The outer ring of the second tapered bearing 6 abuts against the second step, and the inner ring of the second tapered bearing 6 transitions to the tapered rod. Because the inner ring of the second tapered bearing 6 transitions to the tapered rod, when the locking nut 8 is tightened, the second tapered bearing 6 can transmit the preload towards the first tapered bearing 2, causing the first flexible washer 4 and the second flexible washer 5 to undergo elastic deformation, thereby "storing" the preload.

[0032] It should also be noted that, in this embodiment, when the locking nut 8 is tightened, the inner ring of the second tapered bearing 6 transitions into the tapered rod, and the inner ring of the second tapered bearing 6 moves toward the first tapered bearing 2, pressing the second flexible washer 5 and the first flexible washer 4. Since both the first tapered bearing 2 and the second tapered bearing 6 are tapered roller bearings, the preload force acting on the inner ring of the second tapered bearing 6 is also transmitted to the outer ring of the second tapered bearing 6, thereby pressing the outer ring of the second tapered bearing 6 against the second step. That is, the inner and outer rings of the second tapered bearing 6 press against each other axially, thereby achieving the preload of the second tapered bearing 6.

[0033] In this embodiment, the bevel teeth of the driving bevel gear 1 are used to mesh with the bevel teeth of the driven bevel gear; such as Figure 1 As shown, an imprint adjustment shim 3 is also provided between the first cone bearing 2 and the first step of the housing 9; the imprint adjustment shim 3 is provided here to adjust the contact area between the bevel teeth of the driving bevel gear 1 and the bevel teeth of the driven bevel gear.

[0034] like Figure 1 As shown, an oil seal 10 is also provided between the input flange 12 and the housing 9. A retaining ring is fixed on the outer periphery of the input flange 12, located inside the housing 9, and there is a gap between the retaining ring and the housing 9 to ensure that the input flange 12 can rotate normally relative to the housing 9. The retaining ring can also prevent dust from entering the oil seal 10, thus extending the service life of the oil seal 10. In this embodiment, the gap between the retaining ring and the housing 9 is set to 1-3mm.

[0035] like Figure 1 As shown, the input flange 12 and the driving bevel gear 1 are coaxially arranged, and the driving bevel gear 1 is installed inside the input flange 12; specifically, a spline section is provided at the end of the cone rod of the driving bevel gear 1 away from the bevel teeth, and the spline section is connected to the inside of the input flange 12.

[0036] like Figure 1As shown, inside the input flange 12, a third step is provided in the direction of the bevel gear, and a fourth step is provided on the drive bevel gear 1 in the direction of the input flange 12. The fourth step is located on the side of the locking nut 8 away from the bevel gear. The fourth step and the third step cooperate to form a stop positioning structure, which can not only ensure that the drive bevel gear 1 and the input flange 12 can be coaxially limited, but also prevent the drive bevel gear 1 from moving towards the input flange 12, thus avoiding radial movement that could damage the oil seal 10.

[0037] like Figure 1 As shown, a first inclined step facing the conical tooth direction is provided inside the input flange 12. The spline section is located on the conical rod on the side of the first inclined step away from the third step. A reducing section is provided on the conical rod between the third step and the first inclined step. An O-ring 11 is provided near the first inclined step on the reducing section, thereby forming a seal at the bottom of the spline section to prevent oil leakage. Figure 1 As shown, in this embodiment, a sealing layer is also provided in the gap between the end of the cone rod of the active bevel gear 1 and the input flange 12 to form a seal on the top of the spline section to prevent oil leakage at the top of the spline section. This forms a seal on both the upper and lower sides of the spline section, reducing the probability of oil leakage failure at the input end of the active bevel gear (the end connected to the input flange) and improving reliability.

[0038] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A drive axle main cone assembly for a compact loader characterized by, The device includes a housing, within which a drive bevel gear is installed. The drive bevel gear includes a cone rod, one end of which has a fixed bevel tooth, and the other end is connected to an input flange. A first cone bearing and a second cone bearing are installed between the cone rod and the inner wall of the housing. Two flexible washers of the same size and in contact with each other are provided between the first tapered bearing and the second tapered bearing. The flexible washers are elastic. The flexible washers are installed on the outer periphery of the tapered rod and include an elastic ring. One end of the elastic ring abuts against the first tapered bearing or the second tapered bearing, and the other end is fixed to the connecting ring. A locking nut is threaded onto the tapered rod between the second tapered bearing and the input flange, and a locking washer is installed between the locking nut and the second tapered bearing.

2. A drive axle main cone assembly for a compact loader as set forth in claim 1, characterized in that, The first tapered bearing is located near one end of the tapered tooth, and the second tapered bearing is located on the side of the first tapered bearing away from the tapered tooth.

3. A drive axle main cone assembly for a compact loader as set forth in claim 2, wherein, Both the first tapered bearing and the second tapered bearing are tapered roller bearings.

4. A drive axle main cone assembly for a compact loader as set forth in claim 3, wherein, The inner wall of the housing is provided with a first step facing the conical teeth, the outer ring of the first conical bearing abuts against the first step, and the inner ring is interference-fitted with the conical rod.

5. A drive axle main cone assembly for a compact loader as set forth in claim 4, wherein, The inner wall of the housing is also provided with a second step facing the input flange, and the outer ring of the second tapered bearing abuts against the second step, while the inner ring transitions into the tapered rod.

6. The drive axle main cone assembly for a small loader as described in claim 5, characterized in that, The bevel teeth of the driving bevel gear mesh with the bevel teeth of the driven bevel gear. An imprint adjustment shim is provided between the first bevel bearing and the first step to adjust the contact area between the bevel teeth of the driving bevel gear and the bevel teeth of the driven bevel gear.

7. A drive axle main cone assembly for a compact loader as set forth in claim 1, wherein, An oil seal is provided between the input flange and the housing. A retaining ring is fixed on the outer periphery of the input flange. The retaining ring is located inside the housing, and there is a gap between the retaining ring and the housing.

8. A drive axle main cone assembly for a compact loader as set forth in claim 1, wherein, The input flange is coaxially arranged with the driving bevel gear. A spline section is provided at the end of the cone rod of the driving bevel gear away from the bevel teeth, and the spline section is internally connected to the input flange.

9. A drive axle main cone assembly for a compact loader as set forth in claim 8, wherein, The input flange has a third step facing the bevel teeth inside, and the driving bevel gear has a fourth step facing the input flange. The fourth step is located on the side of the locking nut away from the bevel teeth; the fourth step and the third step cooperate to form a stop positioning structure.

10. A drive axle main cone assembly for a compact loader as set forth in claim 9, wherein, The input flange has a first inclined step facing the conical teeth inside. The spline section is located on the conical rod on the side of the first inclined step away from the third step. Between the third step and the first inclined step, a diameter-changing section is provided on the conical rod. An O-ring is provided near the first inclined step on the diameter-changing section. A fastening sealant layer is provided in the gap between the end of the conical rod and the input flange.

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