Multi-bearing structure and gear box

Abstract

The utility model discloses a multi-bearing structure. The multi-bearing structure comprises a bearing seat, a large bearing and a small bearing, the bearing seat is provided with a stepped hole, and the stepped hole comprises a large hole and a small hole which are sequentially and coaxially formed in the axial direction of the stepped hole; the large bearing is mounted in the large hole; and the small bearing is arranged in the small hole. The bearing capacity to the driving output shaft is enhanced, and therefore the driving output shaft is prevented from being pressed and broken. The utility model further discloses a gearbox which comprises a driving output shaft and the multi-bearing structure, and the large bearing and the small bearing are both connected to the driving output shaft in a sleeved mode. The bearing capacity to the driving output shaft is enhanced, and therefore the driving output shaft is prevented from being pressed and broken.

Description

Technical Field

[0001] The utility model relates to the technical field of bearing components, in particular to a multi-bearing structure and a gear box. Background Art

[0002] In developed countries, the market demand for motorcycles to carry less cargo, so only ordinary bearing structures are needed to support the drive output shaft (the drive output shaft is used to connect the wheels). In less developed countries such as Africa, motorcycles are not only used to carry people, but are often fully loaded with cargo. Due to routine overloading, the drive output shaft is easily crushed and broken. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, one of the purposes of the present invention is to provide a multi-bearing structure, which enhances the bearing capacity of the drive output shaft, thereby preventing the drive output shaft from being crushed and broken.

[0004] A second purpose of the present invention is to provide a gear box.

[0005] One of the purposes of the utility model is achieved by the following technical solution:

[0006] A multi-bearing structure, comprising:

[0007] The bearing seat is provided with a stepped hole, wherein the stepped hole comprises a large hole and a small hole coaxially arranged in sequence along the axial direction of the stepped hole;

[0008] A large bearing, mounted in the large hole;

[0009] A small bearing is installed in the small hole.

[0010] Furthermore, the bearing seat is provided with a retaining groove, the retaining groove is located between the large hole and the small hole, the retaining groove is connected to a blocking member, and the blocking member abuts against the end surface of the small bearing.

[0011] Furthermore, the positioning groove is an annular groove, which extends circumferentially around the stepped hole to form a closed-loop groove; the blocking member is an axial retaining ring, which is detachably accommodated in the closed-loop groove.

[0012] Furthermore, the stepped hole also includes a transition hole, and the transition hole is located between the closed-loop groove and the small hole; the diameter of the transition hole is larger than the diameter of the small hole and smaller than the diameter of the closed-loop groove.

[0013] Furthermore, the stepped hole is a through hole structure, and the stepped hole also includes an end hole, the large hole, the small hole and the end hole are sequentially connected along the axial direction of the stepped hole; the diameter of the end hole is smaller than the diameter of the small hole.

[0014] Furthermore, the large bearing is interference fit with the large hole.

[0015] Furthermore, the small bearing is interference fit with the small hole.

[0016] Furthermore, the outer wall of the bearing seat protrudes with at least five reinforcing ribs, and the five reinforcing ribs are distributed at intervals around the circumference of the stepped hole.

[0017] The second purpose of the utility model is achieved by adopting the following technical solution: a gear box, including a driving output shaft and a multi-bearing structure, wherein the large bearing and the small bearing are both sleeved on the driving output shaft.

[0018] Furthermore, the drive output shaft has a shaft shoulder, the shaft shoulder is sleeved with a spacer sleeve, and the spacer sleeve abuts against the large bearing.

[0019] Compared with the prior art, the beneficial effect of the utility model is that by installing a large bearing and a small bearing in a bearing seat, the strength of a multi-bearing structure is improved. Based on this, the drive output shaft is supported by at least two bearings, thereby improving the installation stability and installation strength of the drive output shaft. In particular, when the small bearing is installed in the small hole, the transition fit or interference fit between the two will not affect the size of the large hole, so that the transition fit or interference fit after the large bearing and the small bearing are installed is also more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a gear box of the utility model;

[0021] Figure 2 for Figure 1 A structural schematic diagram of a multi-bearing structure is shown.

[0022] In the figure: 1. bearing seat; 11. stepped hole; 111. large hole; 112. small hole; 113. transition hole; 114. end hole; 12. positioning groove; 13. reinforcing rib; 2. large bearing; 3. small bearing; 4. blocking member; 5. drive output shaft; 51. shaft shoulder; 6. spacer sleeve. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element, or there may be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element, or there may be an element centered thereon. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0025] Unless otherwise defined, all technical terms and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] See also Figure 1-Figure 2 A multi-bearing structure of a preferred embodiment of the utility model includes: a bearing seat 1, a large bearing 2 and a small bearing 3.

[0027] The bearing seat 1 is provided with a stepped hole 11, which includes a large hole 111 and a small hole 112 coaxially arranged in sequence along the axial direction of the stepped hole 11. The large bearing 2 is mounted in the large hole 111, and the small bearing 3 is mounted in the small hole 112. As the name implies, the size of the large bearing 2 is larger than that of the small bearing 3, and the size of the large hole 111 is larger than that of the small hole 112.

[0028] Obviously, by installing the large bearing 2 and the small bearing 3 on the bearing seat 1, the strength of a multi-bearing structure is improved. Based on this, the drive output shaft 5 is supported by at least two bearings, thereby improving the installation stability and installation strength of the drive output shaft 5. In particular, when the small bearing 3 is installed in the small hole 112, the transition fit or interference fit between the two will not affect the size of the large hole 111, so that the transition fit or interference fit after the large bearing 2 and the small bearing 3 are installed is also more reliable.

[0029] It should be noted that if the diameters of the large hole 111 and the small hole 112 are the same, and the diameters of the large bearing 2 and the small bearing 3 are the same, then after the small bearing 3 is installed in the small hole 112, the large hole 111 will be enlarged, especially in the process of the small bearing 3 passing through the large hole 111, it will rub against the large hole 111 and enlarge it, which may eventually cause the stability of the large bearing 2 to decrease after it is installed in the large hole 111.

[0030] In this embodiment, preferably, the bearing seat 1 is provided with a retaining groove 12, which is located between the large hole 111 and the small hole 112. The retaining groove 12 is connected to a blocking member 4, which abuts against the end face of the small bearing 3 to prevent the small bearing 3 from moving toward the direction close to the large bearing 2.

[0031] In this embodiment, preferably, the positioning groove 12 is an annular groove, which extends circumferentially around the stepped hole 11 and forms a closed-loop groove; the blocking member 4 is an axial retaining ring, which is detachably accommodated in the closed-loop groove. This arrangement not only allows the axial retaining ring to be reliably embedded in the closed-loop groove, but also has elasticity, which is convenient for installation and removal.

[0032] In this embodiment, preferably, the stepped hole 11 also includes a transition hole 113, which is located between the closed-loop groove and the small hole 112; the diameter of the transition hole 113 is larger than the diameter of the small hole 112, and smaller than the diameter of the closed-loop groove. In this way, the large bearing 2 is isolated by the transition hole 113, so that the large bearing 2 is limited by the step surface of the bearing seat 1 instead of being limited by the blocking member 4, thereby improving the installation stability of the large bearing 2. In addition, based on the fact that the small bearing 3 is preferably inserted directly from the large hole 111 to the small hole 112, it is best that the diameter of the transition hole 113 is larger than the diameter of the small hole 112.

[0033] In this embodiment, preferably, the stepped hole 11 is a through hole structure, and the stepped hole 11 also includes an end hole 114. The large hole 111, the small hole 112 and the end hole 114 are sequentially connected along the axial direction of the stepped hole 11; the diameter of the end hole 114 is smaller than the diameter of the small hole 112. In this way, the drive output shaft 5 can pass through the large hole 111 and then pass through the end hole 114, so as to enrich the installation environment types of the drive output shaft 5. And, the small bearing 3 is limited by the step surface between the small hole 112 and the end hole 114. In addition, as an alternative setting method, the stepped hole 11 can be a blind hole structure.

[0034] In this embodiment, in order to make the large bearing 2 and the small bearing 3 more securely installed, preferably, the large bearing 2 is interference fit with the large hole 111 ; and the small bearing 3 is interference fit with the small hole 112 .

[0035] In this embodiment, when the bearing strength is improved, preferably, the outer wall protrusion of the bearing seat 1 has at least five reinforcing ribs 13, and the five reinforcing ribs 13 are distributed at intervals around the circumference of the stepped hole 11 to ensure that the corresponding strength of the bearing seat 1 is simultaneously improved.

[0036] The utility model further discloses a gear box, comprising a driving output shaft 5 and a multi-bearing structure, wherein a large bearing 2 and a small bearing 3 are both sleeved on the driving output shaft 5 .

[0037] In this embodiment, preferably, the drive output shaft 5 has a shaft shoulder 51, and the shaft shoulder 51 is sleeved with a spacer sleeve 6, and the spacer sleeve 6 abuts against the large bearing 2. In this arrangement, on the basis of the large bearing 2 being installed in the large hole 111 with an interference fit, the large bearing 2 is further axially limited to prevent the large bearing 2 from axial movement.

[0038] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A multi-bearing structure, characterized in that: include: A bearing seat (1) is provided with a stepped hole (11), wherein the stepped hole (11) comprises a large hole (111) and a small hole (112) which are coaxially arranged in sequence along the axial direction of the stepped hole (11); A large bearing (2) mounted in the large hole (111); A small bearing (3) is mounted in the small hole (112).

2. A multi-bearing structure according to claim 1, characterized in that: The bearing seat (1) is provided with a retaining groove (12), the retaining groove (12) being located between the large hole (111) and the small hole (112), the retaining groove (12) being connected to a blocking member (4), and the blocking member (4) abutting against an end surface of the small bearing (3).

3. A multi-bearing structure according to claim 2, characterized in that: The positioning groove (12) is an annular groove, which extends circumferentially around the stepped hole (11) to form a closed-loop groove; the blocking member (4) is an axial retaining ring, which is detachably accommodated in the closed-loop groove.

4. A multi-bearing structure according to claim 3, characterized in that: The stepped hole (11) further comprises a transition hole (113), wherein the transition hole (113) is located between the closed-loop groove and the small hole (112); the diameter of the transition hole (113) is larger than the diameter of the small hole (112) and smaller than the diameter of the closed-loop groove.

5. A multi-bearing structure according to claim 1, characterized in that: The stepped hole (11) is a through hole structure, and the stepped hole (11) further comprises an end hole (114); the large hole (111), the small hole (112) and the end hole (114) are sequentially connected along the axial direction of the stepped hole (11); and the diameter of the end hole (114) is smaller than the diameter of the small hole (112).

6. A multi-bearing structure according to claim 1, characterized in that: The large bearing (2) is interference fit with the large hole (111).

7. A multi-bearing structure according to claim 1, characterized in that: The small bearing (3) is interference fit with the small hole (112).

8. A multi-bearing structure according to claim 1, characterized in that: The outer wall of the bearing seat (1) is protruded with at least five reinforcing ribs (13), and the five reinforcing ribs (13) are distributed at intervals in the circumferential direction around the stepped hole (11).

9. A gear box, characterized in that: It comprises a driving output shaft (5) and a multi-bearing structure according to any one of claims 1 to 6, wherein the large bearing (2) and the small bearing (3) are both sleeved on the driving output shaft (5).

10. A gear box according to claim 9, characterized in that: The drive output shaft (5) has a shaft shoulder (51), a spacer sleeve (6) is sleeved on the shaft shoulder (51), and the spacer sleeve (6) abuts against the large bearing (2).

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