Detachable roller bearing without outer ring

Abstract

The utility model discloses a detachable roller bearing without an outer ring, which comprises a roller path, the roller path is sleeved and fixed on a planet shaft, one end of the roller path is bent and extends to form a flange, at least one row of rollers are arranged in the roller path, and the rollers are arranged on the flange; the planet shaft is sleeved with a gear, a protruding ring is coaxially fixed to the inner circle face of the gear, the protruding ring is inserted into the roller path and placed on the blocking edge, and the planet shaft is provided with a fixing piece which is used for axially positioning the roller and the protruding ring. According to the utility model, the types of parts can be reduced, the cost is reduced, the reliability is improved, the planet wheel inner hole can be axially positioned without processing a clamping groove, the width requirement on the gear is reduced, and the gear and the outer-ring-free roller bearing can be detached and separated without damaging any part.

Description

Technical Field

[0001] This utility model relates to the technical field of roller bearings, and in particular to a detachable roller bearing without an outer ring. Background Technology

[0002] To reduce costs and dimensions, planetary gear carriers are typically designed as integral units, meaning the planet shaft and carrier are manufactured as a single piece. The planet gears are generally mounted on the planet carrier shaft using roller bearings without outer rings, allowing for axial positioning and circumferential rotation. Roller bearings without outer rings are available in single-row and double-row configurations. Their structural forms and disadvantages are as follows:

[0003] 1. Single-row roller bearing without outer ring;

[0004] A single-row roller bearing without an outer ring typically consists of one raceway, a single row of rollers, two retaining rings, and three snap rings, as shown below. Figure 1 As shown.

[0005] The disadvantages are as follows: a) The parts are numerous and complex, resulting in high cost and low reliability; b) The width of the gear is greater than or equal to the length of the roller plus twice the width of the retaining ring plus twice the thickness of the groove plus twice the thickness of the flange; c) Two grooves need to be machined in the inner hole of the planetary gear, and the planetary gear is axially positioned by the retaining ring and the retaining spring, which increases the machining cost and reduces the machining efficiency of the planetary gear; d) The upper and lower retaining springs need to be inserted into the two grooves in the inner hole of the planetary gear using special tooling, resulting in low installation efficiency; e) Unless a destructive method is used, the installed roller bearing without an outer ring cannot be disassembled and separated from the planetary gear.

[0006] 2. Double row roller bearing without outer ring;

[0007] Double-row roller bearings without outer rings typically consist of one raceway, two rows of rollers, two retaining rings, and two snap rings. Specifically, as shown... Figure 2 As shown.

[0008] The disadvantages are as follows: a) The parts are numerous and complex, resulting in high cost and low reliability; b) A slot needs to be machined in the inner hole of the planetary gear, which increases the machining cost and reduces the machining efficiency of the inner hole; c) Unless a destructive method is used, the installed planetary gear cannot be disassembled from the roller bearing without an outer ring.

[0009] In summary, both existing single-row and double-row roller bearings without outer rings have many drawbacks, such as numerous and complex parts, high cost, low reliability, high cost and low efficiency in machining the inner bore of the planetary gears, and the inability to disassemble the bearing from the planetary gears after installation. Utility Model Content

[0010] The technical problem to be solved by this utility model is to provide a detachable roller bearing without an outer ring, which can reduce the types of parts, reduce costs, improve reliability, and achieve axial positioning without machining grooves in the inner hole of the planetary gear, and also reduce the width requirements of the gear. Furthermore, the gear can be disassembled and separated from the roller bearing without an outer ring without damaging any parts.

[0011] To solve the above-mentioned technical problems, the detachable roller bearing without outer ring provided by this utility model adopts the following technical solution:

[0012] A detachable roller bearing without an outer ring includes a raceway, which is sleeved and fixed on a planetary shaft. One end of the raceway is bent and extended with a flange. At least one row of rollers is placed inside the raceway and is placed on the flange. A gear is sleeved on the planetary shaft. A convex ring is coaxially fixed to the inner surface of the gear. The convex ring is inserted into the raceway and placed on the flange. The planetary shaft is provided with a fixing member for axially positioning the rollers and the convex ring.

[0013] By adopting the above technical solution, the raceway has no upper flange, and the lower flange is extended. The extended lower flange supports a convex ring to support one end face of the planetary gear. The other end face of the gear uses a fixing component to achieve axial positioning of the gear, thus realizing axial positioning and circumferential rotation of the planetary gear relative to the planetary shaft. Using the above-mentioned roller bearing without an outer ring reduces the number of parts, lowers costs, and improves reliability. Axial positioning of the planetary gear's inner bore does not require machining grooves, thus the length requirement of the gear along its axis is only related to the length of the roller along its axis, minimizing the width requirement. Furthermore, because there is no fixing component in the planetary gear's inner bore, the installed gear and the roller bearing without an outer ring can be easily disassembled and separated without damaging any parts.

[0014] Optionally, the height of the raceway is flush with the roller, the fixing member is a snap ring, the fixing member is sleeved and clamped to the planetary shaft, and the fixing member abuts against the end face of the raceway away from the flange.

[0015] By adopting the above technical solution, since the height of the raceway is flush with or slightly higher than the roller, the roller and gear can be axially positioned by the contact spring against the end face of the raceway away from the flange, so as to realize the axial positioning and circumferential rotation of the gear relative to the planetary shaft.

[0016] Optionally, the raceway is further fitted with a retaining ring, the projection of which along the axis simultaneously covers the end faces of the raceway, the roller, and the convex ring away from the retaining edge, and the fixing member abuts against the retaining ring.

[0017] By adopting the above technical solution, the retaining ring is used to limit the movement of the roller and gear, and the retaining ring is positioned by the fixing component. This reduces the outer diameter of the fixing component and improves the strength of the parts.

[0018] Optionally, the number of rollers is two rows, and the inner wall of the raceway is fixed with a partition, which is parallel to its axis. The two rows of rollers are located on both sides of the partition and abut against the partition.

[0019] By adopting the above technical solution, the separation part ensures that the two rows of rollers do not interfere with each other, so that the circumferential rotation of the planetary gear with double-row roller bearings without outer rings is smoother.

[0020] Optionally, the length of the partition is less than the length of the retaining edge.

[0021] In summary, this utility model has at least one of the following beneficial technical effects:

[0022] 1. By installing the above-mentioned roller bearings without outer rings, the number of parts can be reduced, costs can be lowered, and reliability can be improved. The planetary gear inner bore does not need to be machined with grooves to achieve axial positioning, so the length requirement of the planetary gear along its axis is only related to the length of the roller along its axis, and the width requirement is minimized. Furthermore, since there are no fixing parts in the inner bore of the planetary gear, the installed planetary gear and the roller bearing without outer rings can be easily disassembled and separated without damaging any parts.

[0023] 2. Since the height of the raceway is flush with or slightly higher than the roller, the roller and gear can be axially positioned by the contact of the end face of the raceway away from the flange by the fixing component, so as to realize the axial positioning and circumferential rotation of the star wheel relative to the planetary shaft. Attached Figure Description

[0024] Figure 1 This is a schematic diagram used to illustrate the structure of an existing single-row roller bearing without an outer ring.

[0025] Figure 2 This is a schematic diagram used to illustrate the structure of an existing double-row roller bearing without an outer ring.

[0026] Figure 3 The left-middle figure is a schematic diagram of the first structure of the raceway and rollers in this utility model; the right-middle figure is a schematic diagram of the second structure of the raceway and rollers in this utility model.

[0027] Figure 4 This is a schematic diagram of the first integral structure of the present invention used to demonstrate a detachable roller bearing without an outer ring.

[0028] Figure 5 This is a schematic diagram of the second integral structure of the present invention used to demonstrate a detachable roller bearing without an outer ring.

[0029] Explanation of reference numerals in the attached diagram: 1. Fixing element; 2. Retaining ring; 3. Roller; 4. Gear; 5. Raceway. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 3-5 The present invention will be described in further detail below.

[0031] Example 1:

[0032] This utility model discloses a detachable roller bearing without an outer ring. (Refer to...) Figure 3 and Figure 4 The detachable roller bearing without outer ring includes a raceway 5, which is sleeved and fixed on the planetary shaft. One end of the raceway 5 is bent and extended with a flange. At least one row of rollers 3 is placed inside the raceway 5. In this embodiment, the rollers 3 are in a single row and are placed on the flange. The planetary shaft is sleeved with a gear 4. A convex ring is fixed coaxially on the inner surface of the gear 4. The convex ring is inserted into the raceway 5 and placed on the flange. The planetary shaft is provided with a fixing member 1, which is used to axially position the rollers 3 and the convex ring relative to the raceway 5.

[0033] Raceway 5 has no upper flange, but its lower flange is extended. The extended lower flange supports a convex ring to support one end face of the planetary gear 4. The other end face of the planetary gear is axially positioned using a fixing member 1, thus achieving axial positioning and circumferential rotation of the planetary gear relative to the planetary shaft. Using the aforementioned roller bearing without an outer ring reduces the number of parts, lowers costs, and improves reliability. Axial positioning of the planetary gear's inner bore does not require machining grooves, meaning the gear's length requirement along its axis is only related to the roller's length along its axis, minimizing width requirements. Furthermore, because the planetary gear's inner bore has no fixing member, the installed planetary gear and the roller bearing without an outer ring can be easily disassembled and separated without damaging any parts.

[0034] Reference Figure 3 and Figure 4 The height of raceway 5 is flush with or slightly higher than that of roller 3. The retaining element 1 is a retaining ring, which is fitted and secured to the planetary shaft. The retaining element 1 abuts against the end face of raceway 5 away from the flange. Raceway 5 is also fitted with a retaining ring 2. The projection of the retaining ring 2 along its axis simultaneously covers the end faces of raceway 5, roller 3, and the convex ring away from the flange. The retaining element 1 abuts against the retaining ring 2.

[0035] Since the height of raceway 5 is flush with or slightly higher than that of roller 3, the roller 3 and gear 4 can be axially positioned by the contact of the end face of raceway 5 away from the flange by the fixing member 1, thereby achieving the axial positioning and circumferential rotation of gear 4 of the star wheel relative to the planetary shaft. By limiting the roller 3 and gear 4 with retaining ring 2 and then positioning retaining ring 2 with fixing member 1, the outer diameter of fixing member 1 can be reduced, thus improving the strength of the parts.

[0036] The implementation principle of a detachable roller bearing without an outer ring according to this utility model embodiment is as follows: the raceway 5 has no upper flange, and the lower flange of the raceway 5 is extended. The extended lower flange supports a convex ring to support one end face of the planetary gear 4. The other end face of the gear 4 is fixed by a fixing member 1 to achieve axial positioning of the gear 4, thereby realizing the axial positioning and circumferential rotation of the planetary gear relative to the planetary shaft. By installing the above-mentioned roller bearing without an outer ring, the number of parts can be reduced, costs can be lowered, and reliability can be improved. Axial positioning is achieved without machining grooves in the inner hole of the planetary gear, thus the length requirement of the gear along its axis is only related to the length of the roller along its axis, minimizing the width requirement. Furthermore, because there is no retaining spring in the inner hole of the planetary gear, the installed planetary gear and the roller bearing without an outer ring can be easily disassembled and separated without damaging any parts.

[0037] Example 2:

[0038] This utility model embodiment discloses a detachable roller bearing without an outer ring, which differs from the embodiment in that: (Refer to...) Figure 3 and Figure 5 The number of rollers 3 is two rows, and the raceway 5 has a partition fixed to its inner wall parallel to its axis. The two rows of rollers 3 are located on both sides of the partition and abut against it. The length of the partition along the planetary axis is less than the length of the flange. The partition prevents the two rows of rollers 3 from interfering with each other, so that the circumferential rotation of the planetary gear with the double-row roller bearing without outer ring is smoother.

[0039] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A demountable roller bearing without an outer ring, characterized in that: The application relates to a planetary gear device, which comprises a raceway (5) sleeved and fixed on a planetary shaft, a baffle is extended at one end of the raceway (5), at least one row of rollers (3) is arranged in the raceway (5), and the rollers (3) are arranged on the baffle; a gear (4) is sleeved on the planetary shaft, a convex ring is coaxially fixed on the inner surface of the gear (4), the convex ring is inserted into the raceway (5) and arranged on the baffle, and the planetary shaft is provided with a fixing piece (1) for axially positioning the rollers (3) and the convex ring.

2. A demountable roller bearing without an outer ring according to claim 1, characterized in that The height of the raceway (5) is flush with the rollers (3), the fixing piece (1) is a clamping spring, the fixing piece (1) is sleeved and clamped on the planetary shaft, and the fixing piece (1) abuts against the end surface of the raceway (5) away from the baffle.

3. A demountable roller bearing without an outer ring according to claim 2, characterized in that: The raceway (5) is further sleeved with a baffle ring (2), the projection of the baffle ring (2) along the axis simultaneously covers the end surface of the raceway (5), the roller (3) and the convex ring away from the baffle, and the fixing piece (1) abuts against the baffle ring (2).

4. A demountable roller bearing without an outer ring according to claim 1, characterized in that: The number of the rollers (3) is two rows, a separation part is fixed on the inner wall of the raceway (5) parallel to the axis of the raceway (5), and the two rows of rollers (3) are located on the two sides of the separation part and abut against the separation part.

5. A demountable roller bearing without an outer ring according to claim 4, characterized in that: The length of the separation part is smaller than the length of the baffle.

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