Dry farmland type steering drive axle wheel edge anti-abrasion device
By setting up an anti-wear mechanism on the wheel sides of the dryland steering drive axle, adjusting the clearance between the universal joint transmission shaft and the planetary wheel carrier, and using thrust ball bearings and locking mechanisms, the problems of traditional steering drive axles due to wear and squirming are solved, and product reliability and production efficiency are improved.
Patent Information
- Application Number
- CN202422235254.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-12
AI Technical Summary
Due to frequent steering of the traditional dryland type steering drive axle wheel side, the universal joint transmission shaft is axially squirmed, and failures such as wear and gear meshing are caused. The existing solutions can only delay wear and cannot be cured.
By providing an anti-wear mechanism between the planetary wheel carrier and the end of the universal joint drive shaft, including a thrust ball bearing, an elastic retaining ring for holes and an adjustment pad, the gap is adjusted and the wear resistance is improved, and an integral connection is formed by combining the locking mechanism and the sealing structure.
Effectively prevent wear and gear abnormalities caused by axial twitching of the universal joint drive shaft, reduce failure rate, improve product reliability, and reduce market service costs and downtime losses.
Smart Images
Figure CN223076176U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of wheel side reducers, in particular to an anti-wear device for the wheel side of a dry farmland type steering drive axle. Background Art
[0002] For the traditional dry farmland type steering drive axle, due to the frequent steering of the whole axle, the universal joint drive shaft axially moves back and forth, and contact wear often occurs between the universal joint drive shaft and the wheel side anti-wear block under heavy load conditions, resulting in problems such as wear of the axle head of the universal joint drive shaft on the wheel side, high temperature of the wheel side, oil leakage of the oil seal, uneven load on the meshing of the planetary mechanism gears and even tooth breakage. This problem is a typical problem of the current dry farmland type steering drive axle, and there is no good solution. The more common solutions mainly include reducing the friction contact area and adding oil grooves to improve lubrication. However, the above methods can only delay the wear of the wheel side and cannot effectively cure the wear problem. Summary of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide an anti-wear device for the wheel side of a dry farmland type steering drive axle, which solves the problems of axial movement and wear of the universal joint drive shaft on the wheel side due to steering by adjusting the gap between the planetary gear carrier and the end of the universal joint drive shaft.
[0004] The technical solution of the utility model to solve the above technical problems is as follows: an anti-wear device for the wheel side of a dry farmland type steering drive axle, comprising: an anti-wear mechanism, a planetary reduction mechanism, a planetary gear carrier, a steering knuckle housing and a wheel hub; the anti-wear mechanism is detachably installed on the side wall of the planetary gear carrier and abuts against the planetary reduction mechanism, the planetary reduction mechanism is connected with the planetary gear carrier, the planetary reduction mechanism and the steering knuckle housing are fixedly connected through a locking mechanism and are hermetically connected through a half shaft oil seal, the wheel hub is sleeved on the planetary reduction mechanism, the wheel hub and the steering knuckle housing are connected through a wheel hub bearing, the planetary gear carrier and the wheel hub are hermetically connected through a rubber sealing ring, and the steering knuckle housing and the wheel hub are hermetically connected through a wheel hub oil seal; a plug, a hole-type elastic retaining ring, an adjusting pad and a thrust ball bearing are arranged in the anti-wear mechanism, the thrust ball bearing is arranged in the planetary gear carrier and abuts against the end of the universal joint drive shaft in the planetary reduction mechanism, the hole-type elastic retaining ring is clamped in the planetary gear carrier, the adjusting pad is arranged between the thrust ball bearing and the hole-type elastic retaining ring, and the plug is threadedly connected with the side wall of the planetary gear carrier and abuts against the hole-type elastic retaining ring.
[0005] The beneficial effects of the present utility model are as follows: By adjusting the shim and the hole-type snap ring, the gap between the end of the universal joint drive shaft and the planetary gear carrier is adjusted. At the same time, the thrust ball bearing is used to improve the wear resistance of the end of the universal joint drive shaft, avoiding problems such as abnormal pitting, wear, tooth breakage, and high temperature at the wheel side caused by excessive axial movement of the universal joint drive shaft, as well as problems such as rupture, abnormal wear, and jamming caused by uneven force on the needle roller bearing. Furthermore, the market failure rate of the wheel side reducer assembly of the dry field type steering drive axle is reduced, the reliability of the product is improved, and the market service cost and the downtime loss of agricultural machinery users during the operation season are reduced.
[0006] On the basis of the above technical solution, the present utility model can be further improved as follows.
[0007] Further, an observation hole is provided on the side wall of the planetary gear carrier. The hole-type snap ring and the shim are both arranged in the observation hole, and the plug is threadedly connected to the inner wall of the observation hole.
[0008] The beneficial effect of adopting the above further solution is: By observing the meshing condition of the planetary reduction mechanism in the observation hole, problems such as partial load meshing and rotational jamming of the gears caused by assembly or manufacturing problems of the early planetary reduction mechanism are excluded, the zero-kilometer failure of the product can be effectively reduced, the assembly process of the wheel side reducer is optimized, and the production efficiency is improved.
[0009] Further, a connecting shaft is arranged inside the planetary gear carrier. The connecting shaft is arranged in the opposite direction of the anti-wear mechanism and is connected to the planetary reduction mechanism.
[0010] The beneficial effect of adopting the above further solution is: The connecting shaft is connected to the planetary reduction mechanism, which is beneficial to transmitting the power of the planetary reduction mechanism to the planetary gear carrier, and then driving the planetary gear carrier to rotate.
[0011] Further, the planetary reduction mechanism includes: a wheel side planetary gear, a needle roller assembly, and a first snap ring; the first snap ring is arranged on the side wall of the connecting shaft, the needle roller assembly is sleeved on the connecting shaft and abuts against the first snap ring, the wheel side planetary gear is of an annular structure, the inner ring of the wheel side planetary gear meshes with the connecting shaft through the needle roller assembly, and the outer ring meshes with the hub and the universal joint drive shaft.
[0012] The beneficial effect of adopting the above further solution is: The first snap ring is beneficial to limit and install the needle roller assembly on the side wall of the connecting shaft, and the wheel side planetary gear is beneficial to realizing the power transmission between the universal joint drive shaft, the planetary gear carrier, and the hub.
[0013] Further, the planetary reduction mechanism further includes a ring gear assembly. The ring gear assembly is sleeved on the universal joint drive shaft and is connected to the steering knuckle housing through the locking mechanism.
[0014] The beneficial effects of adopting the above further solution are as follows: The ring gear assembly is beneficial to connecting the knuckle housing and the planetary reduction mechanism to form an integral body, and to blocking and limiting the axial movement of the universal joint drive shaft to a certain extent.
[0015] Further, the locking mechanism includes a locking bolt and a positioning sleeve. The positioning sleeve is inserted into the ring gear assembly and the knuckle housing, and the locking bolt is threadedly connected to the inner wall of the positioning sleeve.
[0016] The beneficial effects of adopting the above further solution are as follows: The locking bolt and the positioning sleeve are beneficial to connecting the knuckle housing and the planetary reduction mechanism to form an integral body.
[0017] Further, a plurality of second retaining rings are sleeved on the side wall of the universal joint drive shaft. The second retaining rings are arranged between the ring gear assembly and the planetary gear carrier and are in contact with the ring gear assembly.
[0018] The beneficial effects of adopting the above further solution are as follows: A plurality of second retaining rings are sleeved on the side wall of the universal joint drive shaft, which is beneficial to being blocked by the ring gear assembly when the universal joint drive shaft axially moves, and avoiding problems such as wear and jamming caused by the axial movement of the universal joint drive shaft.
[0019] Further, a half shaft bushing is also sleeved on the side wall of the universal joint drive shaft. The knuckle housing is connected to the outer wall of the universal joint drive shaft through the half shaft bushing and the half shaft oil seal.
[0020] The beneficial effects of adopting the above further solution are as follows: The half shaft bushing is beneficial to supporting the universal joint drive shaft and improving the wear resistance of the universal joint drive shaft at the same time. The half shaft oil seal is beneficial to ensuring the sealing performance between the universal joint drive shaft and the knuckle housing when the universal joint drive shaft rotates.
[0021] Further, a breather for balancing the internal and external air pressures of the wheel side reducer is also provided on the knuckle housing.
[0022] The beneficial effects of adopting the above further solution are as follows: The breather is beneficial to balancing the internal and external air pressures of the wheel side reducer and avoiding damage to parts caused by the pressure difference between the inside and outside of the wheel side reducer.
[0023] Further, an oil port plug for filling and discharging lubricating fluid into the wheel side reducer is provided on the side wall of the planetary gear carrier. The oil port plug is threadedly connected to the side wall of the planetary gear carrier.
[0024] The beneficial effects of adopting the above further solution are as follows: The oil port plug is beneficial to filling and discharging lubricating fluid inside and outside the wheel side reducer, improving the lubrication degree of each component inside the wheel side reducer, and reducing the wear degree between components. Description of the Drawings
[0025] Figure 1 This is the overall structural cross-sectional view provided by the embodiment of the present utility model.
[0026] In the attached drawings, the list of components represented by each reference numeral is as follows:
[0027] 1. Anti-wear mechanism; 2. Planetary reduction mechanism; 3. Planetary gear carrier; 4. Knuckle housing; 5. Hub; 6. Rubber sealing ring; 7. Half-shaft oil seal; 8. Hub oil seal; 9. Locking mechanism; 10. Hub bearing; 21. Cardan shaft; 22. Ring gear assembly; 23. Wheel-side planetary gear; 24. Needle roller assembly; 25. First retaining ring; 31. Connecting shaft; 32. Oil port plug; 33. Observation hole; 41. Breather; 91. Locking bolt; 92. Positioning sleeve; 101. Plug; 102. Hole-type snap ring; 103. Adjusting pad; 104. Thrust ball bearing; 211. Second retaining ring; 212. Half-shaft bushing. Specific embodiments
[0028] The principles and features of the present utility model will be described below. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model.
[0029] As Figure 1 shown, a wheel-side anti-wear device for a dry-field type steering drive axle includes: an anti-wear mechanism 1, a planetary reduction mechanism 2, a planetary gear carrier 3, a knuckle housing 4, and a hub 5; the anti-wear mechanism 1 is detachably installed on the side wall of the planetary gear carrier 3 and abuts against the planetary reduction mechanism 2, the planetary reduction mechanism 2 is connected to the planetary gear carrier 3, the planetary reduction mechanism 2 and the knuckle housing 4 are fixedly connected through a locking mechanism 9 and are hermetically connected through a half-shaft oil seal 7, the hub 5 is sleeved on the planetary reduction mechanism 2, the hub 5 and the knuckle housing 4 are connected through a hub bearing 10, the planetary gear carrier 3 and the hub 5 are hermetically connected through a rubber sealing ring 6, and the knuckle housing 4 and the hub 5 are hermetically connected through a hub oil seal 8; the anti-wear mechanism 1 is provided with a plug 101, a hole-type snap ring 102, an adjusting pad 103, and a thrust ball bearing 104, the thrust ball bearing 104 is arranged in the planetary gear carrier 3 and abuts against the end of the cardan shaft 21 in the planetary reduction mechanism 2, the hole-type snap ring 102 is clamped in the planetary gear carrier 3, the adjusting pad 103 is arranged between the thrust ball bearing 104 and the hole-type snap ring 102, and the plug 101 is threadedly connected to the side wall of the planetary gear carrier 3 and abuts against the hole-type snap ring 102.
[0030] Among them, it should be noted that: in the technical solution of the present utility model, except for the anti-wear mechanism 1, other components can be collectively referred to as a wheel-side reducer.
[0031] The beneficial effects of the present utility model are as follows: By adjusting the shim and the hole-type snap ring, the gap between the end of the cardan shaft and the planet carrier is adjusted. Meanwhile, a thrust ball bearing is used to improve the wear resistance of the end of the cardan shaft, avoiding problems such as abnormal pitting, wear, tooth breakage, and high temperature at the wheel side caused by excessive axial movement of the cardan shaft, as well as problems such as rupture, abnormal wear, and jamming caused by uneven force on the needle roller bearing. Furthermore, the market failure rate of the wheel side reducer assembly of the dry farm type steering drive axle is reduced, the reliability of the product is improved, and the market service cost and the downtime loss of agricultural machinery users during the operation season are reduced.
[0032] Preferably, as Figure 1 shown, an observation hole 33 is provided on the side wall of the planet carrier 3, the hole-type snap ring 102 and the shim 103 are both arranged in the observation hole 33, and the plug 101 is threadedly connected to the inner wall of the observation hole 33.
[0033] The beneficial effects of adopting the above preferred solution are as follows: By observing the meshing condition of the planetary reduction mechanism in the observation hole, problems such as off-axis loading and rotational jamming of the gears caused by assembly or manufacturing problems of the early planetary reduction mechanism are eliminated, the zero-kilometer failure of the product can be effectively reduced, the assembly process of the wheel side reducer is optimized, and the production efficiency is improved.
[0034] Preferably, as Figure 1 shown, a connecting shaft 31 is arranged inside the planet carrier 3, the connecting shaft 31 is arranged in the opposite direction of the anti-wear mechanism 1 and is connected to the planetary reduction mechanism 2.
[0035] The beneficial effects of adopting the above preferred solution are as follows: By connecting the connecting shaft to the planetary reduction mechanism, it is beneficial to transmit the power of the planetary reduction mechanism to the planet carrier, thereby driving the planet carrier to rotate.
[0036] Preferably, as Figure 1 shown, the planetary reduction mechanism 2 includes: a wheel side planetary gear 23, a needle roller assembly 24, and a first snap ring 25; the first snap ring 25 is arranged on the side wall of the connecting shaft 31, the needle roller assembly 24 is sleeved on the connecting shaft 31 and abuts against the first snap ring 25, the wheel side planetary gear 23 is of an annular structure, the inner ring of the wheel side planetary gear 23 meshes with the connecting shaft 31 through the needle roller assembly 24, and the outer ring meshes with the hub 5 and the cardan shaft 21.
[0037] The beneficial effects of adopting the above preferred solution are as follows: The first snap ring is beneficial to limit and install the needle roller assembly on the side wall of the connecting shaft, and the wheel side planetary gear is beneficial to realize the power transmission between the cardan shaft, the planet carrier, and the hub.
[0038] Preferably, as Figure 1 shown, the planetary reduction mechanism 2 further includes a ring gear assembly 22, the ring gear assembly 22 is sleeved on the cardan transmission shaft 21, and is connected to the knuckle housing 4 through the locking mechanism 9.
[0039] The beneficial effect of adopting the above preferred solution is that the ring gear assembly is beneficial to connecting the knuckle housing and the planetary reduction mechanism to form a whole, and to a certain extent, blocking and limiting the axial movement of the cardan transmission shaft.
[0040] Preferably, as Figure 1 shown, the locking mechanism 9 includes a locking bolt 91 and a positioning sleeve 92, the positioning sleeve 92 is inserted into the ring gear assembly 22 and the knuckle housing 4, and the locking bolt 91 is threadedly connected to the inner wall of the positioning sleeve 92.
[0041] The beneficial effect of adopting the above preferred solution is that the locking bolt and the positioning sleeve are beneficial to connecting the knuckle housing and the planetary reduction mechanism to form a whole.
[0042] Preferably, as Figure 1 shown, a plurality of second retaining rings 211 are sleeved on the side wall of the cardan transmission shaft 21, the second retaining rings 211 are arranged between the ring gear assembly 22 and the planet carrier 3, and are in contact with the ring gear assembly 22.
[0043] The beneficial effect of adopting the above preferred solution is that a plurality of second retaining rings are sleeved on the side wall of the cardan transmission shaft, which is beneficial to being blocked by the ring gear assembly when the cardan transmission shaft axially moves, and avoiding problems such as wear and jamming caused by the axial movement of the cardan transmission shaft.
[0044] Preferably, as Figure 1 shown, a half shaft bushing 212 is also sleeved on the side wall of the cardan transmission shaft 21, and the knuckle housing 4 is connected to the outer wall of the cardan transmission shaft 21 through the half shaft bushing 212 and the half shaft oil seal 7.
[0045] The beneficial effect of adopting the above preferred solution is that the half shaft bushing is beneficial to improving the wear resistance of the cardan transmission shaft while supporting it, and the half shaft oil seal is beneficial to ensuring the sealing performance between the cardan transmission shaft and the knuckle housing when it rotates.
[0046] Preferably, as Figure 1 shown, a breather 41 for balancing the internal and external air pressures of the wheel side reducer is also provided on the knuckle housing 4.
[0047] The beneficial effect of adopting the above preferred solution is that the breather is beneficial to balancing the internal and external air pressures of the wheel side reducer, and avoiding damage to parts caused by the pressure difference between the inside and outside of the wheel side reducer.
[0048] Preferably, as Figure 1 shown, an oil port plug 32 for filling and discharging lubricating fluid into the wheel side reducer is provided on the side wall of the planet carrier 3, and the oil port plug 32 is threadedly connected to the side wall of the planet carrier 3.
[0049] The beneficial effect of adopting the above preferred solution is that the oil port plug is conducive to filling and discharging lubricating fluid inside and outside the wheel side reducer, improving the lubrication degree of each component inside the wheel side reducer, and reducing the wear degree between components.
[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention.
[0051] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.
[0052] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0053] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.
[0054] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.
[0055] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.
Claims
1. A wheel side anti-wear device for a dry field type steering drive axle, characterized in that, Comprising: An anti-wear mechanism (1), a planetary reduction mechanism (2), a planetary gear carrier (3), a knuckle housing (4), and a wheel hub (5); the anti-wear mechanism (1) is detachably mounted on the side wall of the planetary gear carrier (3) and abuts against the planetary reduction mechanism (2), the planetary reduction mechanism (2) is connected to the planetary gear carrier (3), the planetary reduction mechanism (2) and the knuckle housing (4) are fixedly connected through a locking mechanism (9) and are hermetically connected through a half shaft oil seal (7), the wheel hub (5) is sleeved on the planetary reduction mechanism (2), the wheel hub (5) and the knuckle housing (4) are connected through a wheel hub bearing (10), the planetary gear carrier (3) and the wheel hub (5) are hermetically connected through a rubber sealing ring (6), and the knuckle housing (4) and the wheel hub (5) are hermetically connected through a wheel hub oil seal (8); The anti-wear mechanism (1) is provided with a plug (101), a hole snap ring (102), an adjusting pad (103), and a thrust ball bearing (104). The thrust ball bearing (104) is arranged inside the planetary gear carrier (3) and abuts against the end of a universal joint drive shaft (21) in the planetary reduction mechanism (2). The hole snap ring (102) is clamped inside the planetary gear carrier (3). The adjusting pad (103) is arranged between the thrust ball bearing (104) and the hole snap ring (102). The plug (101) is threadedly connected to the side wall of the planetary gear carrier (3) and abuts against the hole snap ring (102).
2. The wheel side anti-wear device of a dry field type steering drive axle according to claim 1, characterized in that, An observation hole (33) is arranged on the side wall of the planetary gear carrier (3). The hole snap ring (102) and the adjusting pad (103) are both arranged inside the observation hole (33). The plug (101) is threadedly connected to the inner wall of the observation hole (33).
3. The anti-wear device for the wheel side of a dry-field type steering drive axle according to claim 1, characterized in that, A connecting shaft (31) is arranged inside the planetary gear carrier (3). The connecting shaft (31) is arranged in the reverse direction of the anti-wear mechanism (1) and is connected to the planetary reduction mechanism (2).
4. The anti-wear device for the wheel side of a dry-field type steering drive axle according to claim 3, wherein The planetary reduction mechanism (2) includes: a wheel side planetary gear (23), a needle roller assembly (24), and a first snap ring (25); the first snap ring (25) is arranged on the side wall of the connecting shaft (31). The needle roller assembly (24) is sleeved on the connecting shaft (31) and abuts against the first snap ring (25). The wheel side planetary gear (23) is of an annular structure. The inner ring of the wheel side planetary gear (23) meshes with the connecting shaft (31) through the needle roller assembly (24), and the outer ring meshes with the wheel hub (5) and the universal joint drive shaft (21).
5. The wheel side anti-wear device for a dry field type steering drive axle according to claim 1, characterized in that, The planetary reduction mechanism (2) further includes a ring gear assembly (22). The ring gear assembly (22) is sleeved on the universal joint drive shaft (21) and is connected to the knuckle housing (4) through the locking mechanism (9).
6. The wheel side anti-wear device of a dry farmland type steering drive axle according to claim 5, characterized in that, The locking mechanism (9) includes a locking bolt (91) and a positioning sleeve (92). The positioning sleeve (92) is inserted into the ring gear assembly (22) and the steering knuckle housing (4), and the locking bolt (91) is threadedly connected to the inner wall of the positioning sleeve (92).
7. The anti-wear device for the wheel side of a dry-field type steering drive axle according to claim 6, characterized in that, A plurality of second retaining rings (211) are sleeved on the side wall of the cardan shaft (21). The second retaining rings (211) are arranged between the ring gear assembly (22) and the planet carrier (3) and are in contact with the ring gear assembly (22).
8. The wheel side anti-wear device of a dry-field type steering drive axle according to claim 6, characterized in that A half shaft bushing (212) is also sleeved on the side wall of the cardan shaft (21). The steering knuckle housing (4) is connected to the outer wall of the cardan shaft (21) through the half shaft bushing (212) and the half shaft oil seal (7).
9. The anti-wear device for the wheel side of a dry field type steering drive axle according to claim 1, characterized in that, A breather (41) for balancing the internal and external air pressures of the wheel side reducer is further provided on the steering knuckle housing (4).
10. The wheel side anti-wear device of a dry farmland type steering drive axle according to claim 1, characterized in that, An oil port plug (32) for filling and discharging lubricating fluid into the wheel side reducer is provided on the side wall of the planet carrier (3). The oil port plug (32) is threadedly connected to the side wall of the planet carrier (3).