Elastic pin shaft and gearbox

Abstract

The utility model belongs to the technical field of gear boxes, and discloses an elastic pin shaft and a gear box, and the elastic pin shaft comprises a shaft body and a connecting piece. The shaft body is provided with a connecting hole, the connecting hole extends in the axial direction of the shaft body, the connecting piece is rotationally connected to the connecting hole, the extending direction of the connecting piece is parallel to the axial direction of the shaft body, the connecting piece is provided with a limiting end, the shaft body is limited at the limiting end, and when the connecting piece rotates relative to the connecting hole, the limiting end is configured to apply pre-tightening force to the shaft body in the axial direction of the shaft body. The gear box comprises a box body and an elastic pin shaft, and the elastic pin shaft is arranged on the box body. By means of the arrangement, the elastic pin shaft can improve the strength and the bearing capacity of the elastic pin shaft, and the use requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to gear box technical field especially relates to a kind of elastic pin shaft and gear box. BACKGROUND

[0002] Single main shaft bearing wind power gear box is generally through main shaft bearing, torsion arm and pin bearing to bear the load of entire transmission chain in each direction. Figure 1 As shown in the figure, torsion arm 200 is connected to support seat 100 through pin shaft 300. Among them, the two ends of pin shaft 300 are installed in the pin hole of torsion arm 200, and pin shaft 300 is interference fit with pin hole, and support seat 100 provides reaction force to pin shaft 300 and torsion arm 200.

[0003] In order to increase the interference contact area between pin shaft and pin hole, pin shaft is generally stepped shaft, which is provided with a transition fillet at the stepped position. Because of the geometric mutation at the stepped position of pin shaft, stress concentration is generated, thereby reducing the carrying capacity and strength of pin shaft. At the same time, due to the large and complex load on pin shaft, its strength is difficult to meet the use demand. SUMMARY

[0004] The utility model aims at providing a kind of elastic pin shaft, which can improve its strength and carrying capacity to meet the use demand.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] An elastic pin shaft, comprising:

[0007] A shaft body provided with a connecting hole, the connecting hole is arranged along the axial direction of the shaft body;

[0008] A connecting piece is rotatably connected to the connecting hole, the extension direction of the connecting piece is parallel to the axial direction of the shaft body, the connecting piece has a limiting end, the shaft body is limited by the limiting end, and when the connecting piece rotates relative to the connecting hole, the limiting end is configured to apply a pre-tightening force to the shaft body along the axial direction of the shaft body.

[0009] Optionally, the elastic pin shaft further comprises a locking piece, the locking piece is arranged on the connecting piece, and the shaft body is clamped between the locking piece and the limiting end.

[0010] Optionally, the locking piece is rotatably connected to the connecting piece, and when the locking piece rotates relative to the connecting piece, the pre-tightening force of the locking piece to the shaft body can be adjusted.

[0011] Optionally, the elastic pin shaft further comprises a first pressure bearing arranged between the locking member and the shaft body, and the locking member abuts against one end of the first pressure bearing away from the shaft body.

[0012] Optionally, the elastic pin shaft further comprises a second pressure bearing arranged between the limiting end and the shaft body, and the limiting end abuts against one end of the second pressure bearing away from the shaft body.

[0013] Optionally, the first pressure bearing and / or the second pressure bearing is provided with a deformation cavity near one end of the shaft body.

[0014] Optionally, the first pressure bearing and / or the second pressure bearing is provided with a mounting hole for penetrating the connecting member.

[0015] Optionally, the connecting member is threadedly connected to the connecting hole.

[0016] Optionally, the connecting member and the connecting hole are respectively provided with two, and the two connecting members are connected to the two connecting holes one by one and coaxially arranged.

[0017] Another purpose of the utility model is to provide a gear box, which can improve its strength and carrying capacity and meet the use demand.

[0018] To achieve this purpose, the utility model adopts the following technical scheme:

[0019] A gear box comprises a box body and an elastic pin shaft as described above, and the elastic pin shaft is arranged in the box body.

[0020] The utility model has the advantages of:

[0021] The utility model provides a kind of elastic pin shaft and gear box, and elastic pin shaft includes shaft body and connecting member.The shaft body is provided with connecting hole, and the shaft body is provided with connecting hole, and connecting hole is used to install connecting member, and it is arranged along the axial direction of shaft body by connecting hole to extend, so that connecting member subsequently provides axial pre-tightening force for shaft body.Connecting member is rotationally connected to connecting hole, and the extension direction of connecting member is parallel to the axial direction of shaft body, which ensures the connection compactness and strength between connecting member and connecting hole.Connecting member has limiting end, and shaft body is limited in limiting end, when connecting member rotates relative to connecting hole, limiting end can exert pre-tightening force on shaft body along the axial direction of shaft body, so that, in the initial state of elastic pin shaft, by continuously rotating into limiting end, axial compressive stress is exerted on elastic pin shaft, which can effectively reduce the fatigue damage of elastic pin shaft, improve the strength and carrying capacity of elastic pin shaft.The gear box comprises a box body and an elastic pin shaft, and the elastic pin shaft is arranged in the box body.Through the above arrangement, the elastic pin shaft of the application can improve its strength and carrying capacity, meet the use demand. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a schematic view of a torsion arm connected to a support seat by a pin shaft in the prior art;

[0023] Figure 2 is an isometric view of the elastic pin shaft provided by the embodiment of the utility model;

[0024] Figure 3 is a front view of the elastic pin shaft provided by the embodiment of the utility model;

[0025] Figure 4 is a sectional view of the elastic pin shaft provided by the embodiment of the utility model;

[0026] Figure 5 is an isometric view of the elastic pin shaft provided by another embodiment of the utility model;

[0027] Figure 6 is a front view of the elastic pin shaft provided by another embodiment of the utility model;

[0028] Figure 7 is a sectional view of the elastic pin shaft provided by another embodiment of the utility model;

[0029] Figure 8 is an isometric view of the elastic pin shaft provided by still another embodiment of the utility model;

[0030] Figure 9 is a front view of the elastic pin shaft provided by still another embodiment of the utility model;

[0031] Figure 10 is a sectional view of the elastic pin shaft provided by still another embodiment of the utility model.

[0032] In the drawings:

[0033] 100, support seat; 200, torsion arm; 300, pin shaft;

[0034] 1, shaft body; 11, connecting hole; 2, connecting piece; 21, limiting end; 3, locking piece; 4, first pressure receiving piece; 5, second pressure receiving piece; 51, deformation cavity; 52, mounting hole. DETAILED DESCRIPTION

[0035] The utility model will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model and are not limited to the utility model. In addition, it should be noted that in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all the structures.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] A single-shaft bearing wind turbine gearbox typically uses the main shaft bearing, torque arm, and pins to bear the loads of the entire transmission chain in all directions. For example... Figure 1 As shown, the torque arm 200 is connected to the support base 100 via a pin 300. The two ends of the pin 300 are installed in the pin holes of the torque arm 200, and the pin 300 and the pin holes are interference fit. The support base 100 provides a support reaction force to the pin 300 and the torque arm 200.

[0040] To increase the interference contact area between the pin 300 and the pin hole, the pin 300 is generally a stepped shaft with a transition fillet at the step position. Because of the abrupt geometric change at the step position of the pin 300, stress concentration occurs, reducing the load-bearing capacity and strength of the pin 300. Furthermore, due to the large and complex loads on the pin 300, its strength is insufficient to meet usage requirements.

[0041] like Figures 2-10As shown, the embodiment provides a resilient pin shaft, which comprises a shaft body 1 and a connecting piece 2. The shaft body 1 is provided with a connecting hole 11, the connecting hole 11 is arranged along the axial direction of the shaft body 1, the connecting piece 2 is rotationally connected to the connecting hole 11, the extension direction of the connecting piece 2 is parallel to the axial direction of the shaft body 1, the connecting piece 2 has a limiting end 21, the shaft body 1 is limited by the limiting end 21, and when the connecting piece 2 rotates relative to the connecting hole 11, the limiting end 21 is configured to apply a pre-tightening force to the shaft body 1 along the axial direction of the shaft body 1.

[0042] In the embodiment, the shaft body 1 is provided with a connecting hole 11 for mounting the connecting piece 2, the connecting hole 11 is arranged along the axial direction of the shaft body 1, so that the connecting piece 2 can subsequently provide the shaft body 1 with an axial pre-tightening force. The connecting piece 2 is rotationally connected to the connecting hole 11, and the extension direction of the connecting piece 2 is parallel to the axial direction of the shaft body 1, which ensures the compactness and strength of the connection between the connecting piece 2 and the connecting hole 11. The connecting piece 2 has a limiting end 21, the shaft body 1 is limited by the limiting end 21, and when the connecting piece 2 rotates relative to the connecting hole 11, the limiting end 21 can apply a pre-tightening force to the shaft body 1 along the axial direction of the shaft body 1, so that in the initial state of the resilient pin shaft, the limiting end 21 is continuously screwed in to apply an axial compressive stress to the resilient pin shaft, which can effectively reduce the fatigue damage of the resilient pin shaft and improve the strength and carrying capacity of the resilient pin shaft. Through the above arrangement, the resilient pin shaft of the embodiment can improve its own strength and carrying capacity to meet the use requirements.

[0043] The specific structure of the resilient pin shaft will be described below:

[0044] Specifically, as shown in the figure, Figures 2-7 The resilient pin shaft further comprises a locking piece 3, the locking piece 3 is arranged on the connecting piece 2, and the shaft body 1 is clamped between the locking piece 3 and the limiting end 21. By arranging the locking piece 3, the stress distribution of the resilient pin shaft is further optimized.

[0045] More specifically, the locking piece 3 is rotationally connected to the connecting piece 2, and when the locking piece 3 rotates relative to the connecting piece 2, the pre-tightening force of the locking piece 3 to the shaft body 1 can be adjusted, so that the operator can rotate the locking piece 3 by a torque wrench or a hydraulic stretcher, and then realize accurate control of the pre-tightening force of the resilient pin shaft.

[0046] More specifically, in the embodiment, the locking piece 3 is a nut, the connecting piece 2 is a bolt, the head of the bolt is the limiting end 21, and the threaded shank of the bolt is threadedly connected to the connecting hole 11 and the nut. The operator continuously rotates the bolt by a torque wrench or a hydraulic stretcher, so that the head of the bolt provides an axial pre-tightening force to the shaft body 1, and the shaft body 1 is clamped between the nut and the head of the bolt, thereby effectively reducing the fatigue damage of the resilient pin shaft and improving the strength and carrying capacity of the resilient pin shaft.

[0047] In other embodiments, the locking member 3 is a sleeve, and the connecting member 2 is a screw rod, the screw rod is threadedly connected to the connecting hole 11 and the sleeve, the screw rod provides a pre-tightening force for the shaft body 1 through the threaded cooperation between the screw rod and the connecting hole 11, and the sleeve is arranged at both ends of the screw rod, so that the shaft body 1 is clamped between the two sleeves, thereby improving the carrying capacity and strength of the shaft body 1, and preventing the connecting member 2 from being accidentally pulled out due to external force. It can be understood that the specific structure of the connecting member 2 and the locking member 3 is not limited, as long as the above functions can be achieved.

[0048] Specifically, as shown in Figures 5-7 , the elastic pin shaft further comprises a first pressure receiving member 4, which is arranged between the locking member 3 and the shaft body 1, and the locking member 3 abuts against one end of the first pressure receiving member 4 away from the shaft body 1, avoiding the locking member 3 directly abutting against one end of the shaft body 1. By arranging the first pressure receiving member 4, the load borne by the shaft body 1 can be effectively dispersed, the local stress concentration is reduced, and the overall strength and service life of the elastic pin shaft are improved.

[0049] More specifically, as shown in Figures 5-10 , the elastic pin shaft further comprises a second pressure receiving member 5, which is arranged between the limiting end 21 and the shaft body 1, and the limiting end 21 abuts against one end of the second pressure receiving member 5 away from the shaft body 1, avoiding the locking member 3 directly abutting against one end of the shaft body 1. By arranging the second pressure receiving member 5, the load borne by the shaft body 1 can be effectively dispersed, the local stress concentration is reduced, and the overall strength and service life of the elastic pin shaft are improved.

[0050] More specifically, in this embodiment, the first pressure receiving member 4 and the second pressure receiving member 5 are both carbon steel covers. Moreover, according to the pre-tightening effect of the elastic pin shaft, the first pressure receiving member 4 can be selectively arranged between the locking member 3 and the shaft body 1, and / or the second pressure receiving member 5 can be selectively arranged between the limiting end 21 and the shaft body 1, which can be determined according to the actual use requirements of the elastic pin shaft. In other embodiments, the first pressure receiving member 4 and the second pressure receiving member 5 are both alloy steel covers, as long as the above functions can be achieved, and the specific material and structure of the first pressure receiving member 4 and the second pressure receiving member 5 are not limited.

[0051] Specifically, as shown in Figure 7 and Figure 10 , one end of the first pressure receiving member 4 and / or the second pressure receiving member 5 close to the shaft body 1 is provided with a deformation cavity 51, by arranging the deformation cavity 51, the first pressure receiving member 4 and the second pressure receiving member 5 can be elastically deformed when bearing the load, preventing the pre-tightening force from directly acting on the shaft body 1 and causing damage, and improving the use safety of the elastic pin shaft.

[0052] More specifically, the first pressure-bearing member 4 and / or the second pressure-bearing member 5 are provided with mounting holes 52 for the connector 2 to pass through, so as to facilitate installation and disassembly, thereby improving assembly efficiency and maintenance convenience.

[0053] Specifically, such as Figures 2-10 As shown, the connector 2 is threaded into the connecting hole 11, which ensures a stable connection between the connector 2 and the shaft 1, and also facilitates the adjustment of the preload.

[0054] More specifically, there are two connectors 2 and two connecting holes 11. The two connectors 2 are connected to the two connecting holes 11 in a one-to-one correspondence. The two connectors 2 are coaxially arranged so that the shaft 1 is clamped between the two limiting ends 21, which can further improve the stability and load-bearing capacity of the pin 300 and is suitable for working conditions that bear greater loads.

[0055] More specifically, in this embodiment, the two connecting holes 11 are coaxially arranged, which can ensure that the force distribution of the shaft 1 is more uniform when it is under load, avoid local stress concentration caused by eccentric load, and thus improve the overall load-bearing capacity and service life of the shaft 1.

[0056] This embodiment also provides a gearbox, which includes a housing and a flexible pin. The flexible pin is disposed in the housing, which can improve the strength and load-bearing capacity of the gearbox and meet the usage requirements.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A flexible pin, characterized in that, include: The shaft (1) is provided with a connecting hole (11), which extends along the axial direction of the shaft (1); A connector (2) is rotatably connected to the connecting hole (11). The extension direction of the connector (2) is parallel to the axial direction of the shaft (1). The connector (2) has a limiting end (21). The shaft (1) is limited by the limiting end (21). When the connector (2) rotates relative to the connecting hole (11), the limiting end (21) is configured to apply a preload to the shaft (1) along the axial direction of the shaft (1).

2. The elastic pin according to claim 1, characterized in that, The elastic pin also includes a locking member (3), which is disposed on the connector (2), and the shaft (1) is sandwiched between the locking member (3) and the limiting end (21).

3. The elastic pin according to claim 2, characterized in that, The locking member (3) is rotatably connected to the connecting member (2). When the locking member (3) rotates relative to the connecting member (2), it can adjust the preload of the locking member (3) on the shaft (1).

4. The elastic pin according to claim 2, characterized in that, The elastic pin also includes a first bearing member (4), which is disposed between the locking member (3) and the shaft (1), and the locking member (3) abuts against the end of the first bearing member (4) away from the shaft (1).

5. The elastic pin according to claim 4, characterized in that, The elastic pin also includes a second bearing member (5), which is disposed between the limiting end (21) and the shaft body (1), and the limiting end (21) abuts against the end of the second bearing member (5) away from the shaft body (1).

6. The elastic pin according to claim 5, characterized in that, The first pressure-bearing member (4) and / or the second pressure-bearing member (5) have a deformation cavity (51) at one end near the shaft (1).

7. The elastic pin according to claim 5, characterized in that, The first pressure-bearing member (4) and / or the second pressure-bearing member (5) are provided with mounting holes (52) for the connector (2) to pass through.

8. The elastic pin according to claim 1, characterized in that, The connector (2) is threaded into the connecting hole (11).

9. The resilient pin according to any one of claims 1-8, characterized in that, Two connectors (2) and two connecting holes (11) are provided respectively. The two connectors (2) are connected to the two connecting holes (11) in a one-to-one correspondence. The two connectors (2) are coaxially arranged.

10. A gearbox, characterized in that, It includes a housing and a resilient pin as described in any one of claims 1-9, wherein the resilient pin is disposed in the housing.

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