Center plate structure

Abstract

The utility model discloses a center plate structure, and belongs to the technical field of rails. Comprising a lower center plate, an upper center plate, center plate pins and round nuts. The lower center plate and the upper center plate are fixed to a bogie and a vehicle body respectively. The center plate pin penetrates through the upper center plate and the lower center plate, the lower part is provided with a limiting piece, and the upper end is provided with a head part; a stepped hole is formed in the center of the upper center plate, an inner plate is arranged on the lower center plate, and the inner plate is located in a large hole of the stepped hole; the vehicle body seals the top of the small hole of the stepped hole to form a circular cavity; the round nut and the stepped hole are coaxially arranged, external threads are arranged on the peripheral surface of the round nut, the round nut is located over the inner disc, the upper side of the round nut abuts against the stepped surface of the stepped hole, and the round nut is fixed in the large hole; the head part is located in the circular cavity, gaps are formed between the top and the circumferential surface of the head part and the circular cavity, and the head part leans against the upper side of the circular nut; the center plate pin penetrates through the round nut downwards, and a gap is formed between the center plate pin and the inner side of the round nut. The center plate pin can swing, so that the failure rate of the center plate structure can be effectively reduced, and the center plate pin can be prevented from being broken.

Description

Technical Field

[0001] The utility model belongs to the technical field of tracks, and in particular relates to a core disc structure with a longer service life. Background Art

[0002] The hub structure connects the carbody and bogie. During vehicle operation, the vertical load of the carbody is transferred to the bogie through the hub structure. The hub structure typically consists of an upper hub, a lower hub, and a hub pin. The upper and lower hubs form a concave-convex fit, and the hub pin passes through both. The upper hub is connected to the carbody, while the lower hub is connected to the bogie. Its function is to transfer the weight of the vehicle's cargo to the wheels and reduce vehicle drag. It also accommodates horizontal and vertical angular errors between the carbody and bogie when the vehicle negotiates curves. When the carbody changes horizontally, the upper and lower hubs rotate relative to each other; when the carbody changes vertically, the upper and lower hubs deflect relative to each other. When the vehicle starts and brakes, the upper and lower hubs move.

[0003] See also Figure 1 The existing center plate structure includes a lower center plate 1, an upper center plate 2 and a center plate pin 3, etc. The lower center plate 1 and the upper center plate 2 are fixed on the bogie 4 and the car body 5 respectively. The center plate pin 3 passes through the upper center plate 2 and the lower center plate 1 downward in sequence. A limiter 6 is provided at its lower part and below the bogie 4, and a head 9 is coaxially provided at its upper end. A stepped hole 7 for the center plate pin 3 to pass through is provided at the center of the upper center plate 2, and the hole is smaller at the top and larger at the bottom. An inner plate 8 is coaxially provided in the middle of the upper side of the lower center plate 1, and the inner plate 8 is located in the large hole 71 of the stepped hole 7. The head 9 is located on the upper side of the car body 5 (on which a through hole for the center plate pin 3 to pass through is provided) and is welded and fixed to the upper side of the car body 5.

[0004] The structure of the upper center plate 2 can be found in the description of application number CN02240529.1.

[0005] The existing center plate pin 3 is a welded, fixed structure. If the lower center plate hole is machined too small, the inner tapered surface of the lower center plate joint surface is too large, or the inner tapered surface of the upper center plate joint surface is too small (both the lower and upper center plates are special-shaped structures with large machined surfaces, resulting in a high probability of machining errors), the center plate pin will first contact the lower center plate inner hole, while the tapered surfaces of the upper and lower center plates do not contact. In this state, the force distribution pattern of the center plate changes, from the original tapered surface contact to the center plate pin contacting the lower center plate inner hole, which can easily cause the center plate pin to break, thereby risking the vehicle falling apart. Furthermore, the welded center plate pin is difficult to replace later. Utility Model Content

[0006] To address the aforementioned issues, the present invention provides a center plate structure that uses a round nut to constrain the center plate pin between the vehicle frame and the center plate, leaving sufficient clearance to ensure the center plate pin can swing. This prevents the center plate's stress state from changing due to factors such as a small gap between the center plate pin and the center hole of the center plate, or excessive clearance between the upper and lower center plate conical surfaces. This effectively reduces the failure rate of the center plate structure and prevents the center plate pin from breaking. The technical solution is as follows:

[0007] The embodiment of the present utility model provides a center plate structure, including a lower center plate 1, an upper center plate 2 and a center plate pin 3, wherein the lower center plate 1 and the upper center plate 2 are fixed on the bogie 4 and the car body 5 respectively; the center plate pin 3 passes through the upper center plate 2 and the lower center plate 1 downward in sequence, and a limiter 6 is provided at its lower part and below the bogie 4, and a head 9 is coaxially provided at its upper end; a stepped hole 7 for the center plate pin 3 to pass through is provided at the center of the upper center plate 2, and the stepped hole 7 is smaller at the top and larger at the bottom, and an inner plate 8 is coaxially provided at the middle of the upper side of the lower center plate 1, and the inner plate 8 is located in the large hole 71 of the stepped hole 7; the center plate The structure also includes a round nut 10 threadedly connected to the inner wall of the large hole 71. The car body 5 closes the top of the small hole 72 of the stepped hole 7 to form a circular cavity for accommodating the head 9; the round nut 10 is coaxially arranged with the stepped hole 7, and an external thread is provided on its outer peripheral surface. It is located directly above the inner disk 8, and its upper side rests on the step surface of the stepped hole 7; the head 9 is located in the circular cavity, and there is a gap between its top and peripheral surface and the circular cavity, and it rests on the upper side of the round nut 10; the center disk pin 3 passes downward through the round nut 10 and there is a gap between it and the inner side of the round nut 10.

[0008] Furthermore, in the embodiment of the present invention, a gap is formed between the stopper 6 and the lower side of the bogie 4 to allow the upper center plate 2 to swing up and down.

[0009] Specifically, the diameter of the large hole 71 in the embodiment of the present invention is the same as the outer diameter of the round nut 10 and an internal thread is provided on its inner wall; the inner diameter of the round nut 10 is larger than the diameter of the core pin 3 and smaller than the diameter of the head 9.

[0010] Furthermore, the distance between the top of the head 9 and the vehicle body 5 in the embodiment of the utility model is 2-4 mm, and the distance between its circumference and the inner wall of the small hole 72 is 3-5 mm; the distance between the center disk pin 3 and the inner side of the round nut 10 is 2.5-4.5 mm.

[0011] Specifically, the distance between the top of the head 9 and the vehicle body 5 in the embodiment of the present invention is 3 mm, and the distance between its circumference and the inner wall of the small hole 72 is 4 mm; the distance between the center disk pin 3 and the inner side of the round nut 10 is 3.5 mm.

[0012] Specifically, the round nut 10 in the embodiment of the present invention is located adjacent to and above the inner disk 8 .

[0013] Among them, the limiting member 6 in the embodiment of the present invention is a U-shaped card arranged horizontally and coordinated with the core disk pin 3, and the two sides of the lower part of the core disk pin 3 are provided with card slots 11 that cooperate with the two arms of the limiting member 6; the limiting member 6 is sleeved on the core disk pin 3, and its two arms are respectively embedded in the two card slots 11, and a fixing pin 12 is provided between its two arms; the fixing pin 12 is perpendicular to the core disk pin 3, and it is located at the opening of the limiting member 6, and it rests on the core disk pin 3.

[0014] Furthermore, a plurality of auxiliary mounting holes 13 are provided on the lower side of the round nut 10 in the embodiment of the present invention. The plurality of auxiliary mounting holes 13 are evenly distributed around the central hole of the round nut 10 and are all vertically arranged.

[0015] Specifically, the number of the auxiliary mounting holes 13 in the embodiment of the present invention is four and they pass through the round nut 10 .

[0016] The beneficial effects of the technical solution provided by the embodiment of the present invention are as follows: the embodiment of the present invention provides a center disc structure, which can restrict the center disc pin between the frame and the center disc through a round nut, and leave sufficient clearance to ensure that the center disc pin can swing, so as to avoid changes in the center disc stress state due to reasons such as a small gap between the center disc pin and the center hole of the center disc, or an excessively large clearance between the upper and lower center disc conical surfaces. This can effectively reduce the failure rate of the center disc structure, avoid breakage of the center disc pin, and increase service life. At the same time, the provision of the round nut also facilitates the replacement of the center disc pin. In addition, the stepped hole cooperates with the round nut to make the round nut more firmly fixed (similar to a double-nut anti-loosening structure). BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the existing core-disk structure;

[0018] Figure 2 This is a structural diagram of the core disk structure in an embodiment of the present utility model;

[0019] Figure 3 This is a structural diagram of the upper center plate;

[0020] Figure 4 It is a structural diagram of the core disk pin;

[0021] Figure 5 It is a structural diagram of a round nut;

[0022] Figure 6 It is a cross-sectional view of a round nut;

[0023] Figure 7 It is a structural diagram of the limiter.

[0024] In the figure: 1 lower center plate, 2 upper center plate, 3 center plate pin, 4 bogie, 5 car body, 6 limiter, 7 stepped hole, 8 inner plate, 9 head, 10 round nut, 11 slot, 12 fixing pin, 13 auxiliary mounting hole;

[0025] 71 large hole, 72 small hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] See also Figure 1-7 Example 1 provides a center plate structure comprising a lower center plate 1, an upper center plate 2, a center plate pin 3, and a round nut 10. The lower center plate 1 and upper center plate 2 are respectively fixed to the bogie 4 (specifically, the bolster) and the car body 5 (specifically, the center beam). The lower center plate 1, upper center plate 2, and center plate pin 3 are coaxially arranged, with the upper center plate 2 located above the lower center plate 1. The center plate pin 3 extends downward through the upper center plate 2 and lower center plate 1, respectively. A stopper 6 is provided below the center plate, below the bogie 4. The stopper 6 is spaced from the underside of the bogie 4 (specifically, 19 mm, determined by the depth of the lower center plate 1) to allow the upper center plate 2 to swing up and down. A stepped hole 7, smaller at the top and larger at the bottom, is provided at the center of the upper center plate 2 for the center plate pin 3 to pass through. The stepped hole 7 comprises a larger hole 71 at the top and a smaller hole 72 at the bottom. An inner plate 8 is coaxially provided in the upper center portion of the lower center plate 1 and is located within the larger hole 71. The vehicle body 5 closes the top of the small hole 72 of the stepped hole 7 to form a circular cavity for accommodating the head 9. The round nut 10 is coaxially arranged with the stepped hole 7, and an external thread is provided on its outer peripheral surface. It is located directly above the inner disk 8, and its upper side rests on the step surface of the stepped hole 7 (forming a double-nut structure with an anti-loosening effect). Its thread is fixed on the inner wall of the large hole 71, and it is located adjacent to and above the inner disk 8. The head 9 is located in the circular cavity, and there is a gap between its top and peripheral surface and the circular cavity, and it rests on the upper side of the round nut 10. The center disk pin 3 passes downward through the round nut 10 and there is a gap between it and the inner side of the round nut 10. The above gap allows the center disk pin 3 to be slightly adjusted.

[0029] Specifically, the diameter of the large hole 71 in the embodiment of the present invention is the same as the outer diameter of the round nut 10 and an internal thread is provided on its inner wall; the inner diameter of the round nut 10 is larger than the diameter of the core pin 3 and smaller than the diameter of the head 9.

[0030] Furthermore, in the embodiment of the present invention, the distance between the top of the head 9 and the vehicle body 5 is 2-4 mm, the distance between its circumference and the inner wall of the small hole 72 is 3-5 mm, and the distance between the center pin 3 and the inner side of the round nut 10 is 2.5-4.5 mm.

[0031] Furthermore, the round nut 10 in this embodiment of the present invention is provided with multiple auxiliary mounting holes 13 on its underside (used with specialized tools for installing and removing the round nut 10). These holes 13 are evenly distributed around the central hole of the round nut 10 and are all vertically arranged. Specifically, there are four auxiliary mounting holes 13 (distributed in a cross pattern) that extend through the round nut 10 (without distinguishing between the front and back sides).

[0032] Example 2

[0033] See also Figure 2 、 4 and 7, Example 2 provides a core disk structure, which is basically the same as that of Example 1, except that: the limiting member 6 in this embodiment is a U-shaped card that is horizontally arranged and cooperates with the core disk pin 3, and the two sides of the lower part of the core disk pin 3 are provided with card slots 11 (two in total, specifically rectangular slots) that cooperate with the two arms of the limiting member 6. The limiting member 6 is sleeved on the core disk pin 3, and its two arms are respectively embedded in the two card slots 11, and a fixing pin 12 is provided between its two arms. The fixing pin 12 is perpendicular to the core disk pin 3, and is located at the opening of the limiting member 6, and it rests on the core disk pin 3.

[0034] Example 3

[0035] Example 3 provides a core plate structure, which is basically the same as that of Example 1, except that: the diameter of the lower core plate 1 in this embodiment is 315 mm, and the diameter of the upper core plate 2 is 280 mm. The diameter of the head 9 is 70 mm, the distance between the top of the head 9 and the vehicle body 5 is 3 mm, and the distance between its circumference and the inner wall of the small hole 72 is 4 mm. The distance between the core plate pin 3 and the inner side of the round nut 10 is 3.5 mm. The outer diameter of the round nut 10 is 90 mm, and the diameter of the core plate pin 3 is 48 mm, then the inner diameter of the round nut 10 is 55 mm. The thickness of the round nut 10 is 28 mm. The depth of the large hole 71 is 38 mm.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A center plate structure, comprising a lower center plate (1), an upper center plate (2) and a center plate pin (3), wherein the lower center plate (1) and the upper center plate (2) are fixed on a bogie (4) and a car body (5) respectively; the center plate pin (3) passes through the upper center plate (2) and the lower center plate (1) in sequence downward, and a stopper (6) is provided at its lower part and below the bogie (4), and a head (9) is coaxially provided at its upper end; a stepped hole (7) for the center plate pin (3) to pass through is provided at the center of the upper center plate (2), and the stepped hole (7) is smaller at the top and larger at the bottom, and an inner plate (8) is coaxially provided at the middle of the upper side of the lower center plate (1), and the inner plate (8) is located in the large hole (71) of the stepped hole (7); characterized in that, The center plate structure also includes a round nut (10) threadedly connected to the inner wall of the large hole (71), and the vehicle body (5) closes the top of the small hole (72) of the stepped hole (7) to form a circular cavity for accommodating the head (9); the round nut (10) is coaxially arranged with the stepped hole (7), and is provided with an external thread on its outer peripheral surface. It is located directly above the inner plate (8), and its upper side rests on the step surface of the stepped hole (7); the head (9) is located in the circular cavity, and there is a gap between its top and peripheral surface and the circular cavity, and it rests on the upper side of the round nut (10); the center plate pin (3) passes downward through the round nut (10) and there is a gap between it and the inner side of the round nut (10).

2. The core disk structure according to claim 1, characterized in that: The limiting member (6) is spaced apart from the lower side of the bogie (4) to allow the upper center plate (2) to swing up and down.

3. The core disk structure according to claim 1, characterized in that: The diameter of the large hole (71) is the same as the outer diameter of the round nut (10) and an internal thread is provided on its inner wall; the inner diameter of the round nut (10) is larger than the diameter of the center disk pin (3) and smaller than the diameter of the head (9).

4. The core disk structure according to claim 1, characterized in that: The distance between the top of the head (9) and the vehicle body (5) is 2-4 mm, and the distance between its peripheral surface and the inner wall of the small hole (72) is 3-5 mm; the distance between the center disk pin (3) and the inner side of the round nut (10) is 2.5-4.5 mm.

5. The core disk structure according to claim 1, characterized in that: The distance between the top of the head (9) and the vehicle body (5) is 3 mm, and the distance between its peripheral surface and the inner wall of the small hole (72) is 4 mm; the distance between the center disk pin (3) and the inner side of the round nut (10) is 3.5 mm.

6. The core disk structure according to claim 1, characterized in that: The round nut (10) is located adjacent to and above the inner disk (8).

7. The core disk structure according to claim 1, characterized in that: The limiting member (6) is a U-shaped card arranged horizontally and matched with the core disk pin (3), and the two sides of the lower part of the core disk pin (3) are provided with card slots (11) matched with the two arms of the limiting member (6); the limiting member (6) is sleeved on the core disk pin (3), and its two arms are respectively embedded in the two card slots (11), and a fixing pin (12) is provided between the two arms; the fixing pin (12) is perpendicular to the core disk pin (3), is located at the opening of the limiting member (6), and is against the core disk pin (3).

8. The core disk structure according to claim 7, characterized in that: A plurality of auxiliary mounting holes (13) are provided on the lower side of the round nut (10), and the plurality of auxiliary mounting holes (13) are evenly distributed around the central hole of the round nut (10) and are all arranged vertically.

9. The core disk structure according to claim 8, characterized in that: The number of the auxiliary mounting holes (13) is four and they pass through the round nut (10).

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