Connecting rod shaft assembly, air pump, air suspension system and vehicle

Abstract

The utility model relates to a transmission mechanism of a pump body, in particular to a connecting rod shaft assembly which comprises a connecting rod shaft (1), one end of the connecting rod shaft (1) is connected with an eccentric wheel (2), the middle of the connecting rod shaft (1) is connected with a bearing (4), the upper end face of the eccentric wheel (2) is attached to the lower end face of the bearing (4), and the outer ring of the bearing (4) is connected with a piston rod (3). The eccentric wheel (2) drives the connecting rod shaft (1) to rotate so that the piston rod (3) can move linearly, and the movement track of the piston rod (3) is perpendicular to the central axis of the connecting rod shaft (1). The connecting rod shaft assembly can be connected with the connecting rod shaft through the eccentric wheel, the connecting rod shaft is provided with the bearing, and the bearing is attached to the eccentric wheel, so that the stress arm can be reduced, and the service life of the connecting rod shaft is prolonged.

Description

Technical Field

[0001] The utility model relates to a transmission mechanism of a pump body, in particular to a connecting rod shaft assembly. In addition, the utility model also relates to an air pump, an air suspension system and a vehicle. Background Art

[0002] When the air pump in the air suspension system of existing vehicles is working, its piston can drive the movement of the crankshaft main bearing seat through the connecting rod shaft connected to it. A bearing is provided on the connecting rod shaft, and the center of the connecting rod shaft is far away from the center of the bearing, resulting in a higher force point position of the connecting rod shaft. As a result, the connecting rod shaft is easily damaged or even broken due to the long-term use of external forces.

[0003] Based on the above reasons, it is difficult to effectively guarantee the service life of the connecting rod shaft with the existing technology. Utility Model Content

[0004] The first problem to be solved by the utility model is to provide a connecting rod shaft assembly. When the eccentric wheel rotates, the connecting rod shaft is driven to perform annular motion, thereby driving the piston rod connected to the connecting rod shaft to move, effectively reducing the force arm, extending the service life of the connecting rod shaft, having a simple structure and good use effect.

[0005] In order to solve the above-mentioned technical problems, the first aspect of the utility model provides a connecting rod shaft assembly, including a connecting rod shaft, one end of the connecting rod shaft is connected to an eccentric wheel, the middle part of the connecting rod shaft is connected to a bearing, the upper end surface of the eccentric wheel is abutted against the lower end surface of the bearing, and the outer ring of the bearing is connected to a piston rod, the eccentric wheel drives the connecting rod shaft to rotate so that the piston rod can form a linear motion, and the movement trajectory of the piston rod is perpendicular to the central axis of the connecting rod shaft.

[0006] As a preferred embodiment of the utility model, the connecting rod shaft is sequentially provided with a connecting rod shaft lower force arm, a connecting rod shaft upper force arm, a connecting rod shaft connecting optical axis and a connecting rod shaft connecting threaded axis, and steps are formed between the connecting rod shaft lower force arm and the connecting rod shaft upper force arm, between the connecting rod shaft upper force arm and the connecting rod shaft connecting optical axis, and between the connecting rod shaft connecting optical axis and the connecting rod shaft connecting threaded axis.

[0007] More preferably, a limiting structure is formed on the upper force arm of the connecting rod shaft, and the limiting structure is suitable for abutting against the end surface of the bearing to limit the movement of the bearing in the direction of the central axis of the connecting rod shaft.

[0008] As another preferred embodiment of the present utility model, the limiting structure comprises a clamping groove provided on the lever arm of the connecting rod shaft, and a shaft elastic retaining ring is clamped in the clamping groove; or

[0009] The limiting structure is formed as an annular gasket, which is suitable for being sandwiched between the outer ring end face of the bearing and the end face of the bearing mounting groove of the piston rod center sleeve of the piston rod.

[0010] As another preferred embodiment of the utility model, it further comprises a shaft end baffle, a shaft sleeve and a shaft end threaded fixing sleeve, wherein the central area of ​​the shaft end baffle is formed as a through hole, and the connecting rod shaft is suitable for passing through the through hole.

[0011] Further preferably, the sleeve comprises an inner sleeve, an outer sleeve and a buffer sleeve arranged between the inner sleeve and the outer sleeve, and the inner sleeve, the outer sleeve and the buffer sleeve are all sleeved on the outer circumferential surface of the connecting rod shaft upper force arm of the connecting rod shaft.

[0012] As a specific structural form of the utility model, the central area of ​​the shaft end threaded fixing sleeve is formed as a threaded through hole, and an external thread is formed on the outer peripheral surface of the connecting rod shaft connecting threaded shaft of the connecting rod shaft, and the connecting rod shaft connecting threaded shaft is adapted to the shaft end threaded fixing sleeve.

[0013] Further specifically, the shaft end baffle includes a center boss, a pressure-bearing platform connected to the center boss, and a baffle flange connected to the pressure-bearing platform, the pressure-bearing platform is suitable for abutting against the end surface of the central mounting sleeve of the piston rod, and the through hole in the central area of ​​the shaft end baffle is arranged on the center boss.

[0014] The second aspect of the utility model further provides an air pump, comprising a connecting rod shaft assembly as described in any one of the technical solutions of the first aspect.

[0015] The third aspect of the utility model further provides an air suspension system, comprising the air pump described in the technical solution of the second aspect.

[0016] The third aspect of the utility model further provides a vehicle, comprising the air suspension system described in the technical solution of the third aspect.

[0017] Through the above technical scheme, the connecting rod shaft assembly of the utility model includes a connecting rod shaft, one end of the connecting rod shaft is connected to an eccentric wheel, the middle part of the connecting rod shaft is connected to a bearing, the outer ring of the bearing is connected to a piston rod, the eccentric wheel drives the connecting rod shaft to rotate, so that the piston rod can form a linear motion, and the motion trajectory of the piston rod is perpendicular to the central axis of the connecting rod shaft. The connecting rod shaft assembly of the utility model is fixedly connected to the end of the connecting rod shaft with an eccentric wheel, the middle part of the connecting rod shaft is provided with a bearing, and the piston rod is connected to the outer ring of the bearing, so that the connecting rod shaft can be driven to rotate when the eccentric wheel rotates, and the connecting rod shaft will present a circular motion when the eccentric wheel rotates, thereby driving the piston rod connected to the connecting rod shaft to move. Since the force of the connecting rod shaft comes from the bearing, the force center point is the bearing and the center point of the connecting rod shaft is located at the center of the bearing, and the force arm is significantly reduced, thereby effectively ensuring the service life of the connecting rod shaft.

[0018] Other advantages of the present invention and the technical effects of the preferred embodiments will be further described in the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a connecting rod shaft assembly of an embodiment of the utility model;

[0020] Figure 2 It is a structural schematic diagram of a connecting rod shaft of an embodiment of the utility model;

[0021] Figure 3 is a cross-sectional view of a connecting rod shaft according to an embodiment of the utility model;

[0022] Figure 4 It is a structural schematic diagram of a shaft end baffle of an embodiment of the utility model.

[0023] Description of Reference Numerals

[0024] 1 Connecting rod shaft 101 Connecting rod shaft lower force arm

[0025] 102 connecting rod shaft upper force arm 103 connecting rod shaft connecting optical axis

[0026] 104 connecting rod shaft connected to threaded shaft 2 eccentric wheel

[0027] 3 piston rod 301 piston rod center sleeve

[0028] 302 piston rod body 4 bearings

[0029] 5 limit structure 6 shaft end stopper

[0030] 601 center boss 602 pressure platform

[0031] 603 baffle flange 7 sleeve

[0032] 701 inner sleeve 702 outer sleeve

[0033] 703 buffer sleeve 8 shaft end threaded fixing sleeve DETAILED DESCRIPTION

[0034] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0035] First of all, it should be noted that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] like Figure 1 As shown, the first aspect of the utility model provides a connecting rod shaft assembly, including a connecting rod shaft 1, one end of the connecting rod shaft 1 is connected to an eccentric wheel 2, the middle part of the connecting rod shaft 1 is connected to a bearing 4, the upper end surface of the eccentric wheel 2 is in contact with the lower end surface of the bearing 4, and the outer ring of the bearing 4 is connected to a piston rod 3, the eccentric wheel 2 drives the connecting rod shaft 1 to rotate so that the piston rod 3 can form a linear motion, and the motion trajectory of the piston rod 3 is perpendicular to the central axis of the connecting rod shaft 1.

[0038] The connecting rod shaft assembly of the utility model is located in the middle of the transmission mechanism inside the pump body, and is the transmission mechanism inside the pump body. The eccentric wheel 2 is fixedly connected to one end of the connecting rod shaft 1, and the middle of the connecting rod shaft 1 is fixedly connected to a bearing 4, which includes a bearing outer ring and a bearing inner ring. The bearing outer ring is fixedly connected to the connecting rod shaft 1, and the bearing outer ring is connected to the piston rod 3.

[0039] like Figure 1As shown, the piston rod 3 includes a piston rod center sleeve 301 arranged in the central area, and a piston rod body 302 is fixedly connected to the outer circumferential surface of the piston rod center sleeve 301. A bearing mounting groove concave outward is formed in the central area of ​​the piston rod center sleeve 301, and the outer ring of the bearing is fixedly connected in the bearing mounting groove. The diameter of the bearing mounting groove is larger than the central through hole of the piston rod center sleeve 301, and the eccentric wheel 2 can be inserted into the central through hole of the piston rod center sleeve 301.

[0040] In the utility model, the eccentric wheel 2 is fixedly connected to the connecting rod shaft 1. The eccentric wheel 2 has two central axes, which are respectively set as the first central axis and the second central axis. The central axis of the connecting rod shaft 1 is formed as the third central axis. The first central axis of the eccentric wheel 2 is formed as the rotating central axis, and the second central axis can present annular motion around the first central axis. The third central axis of the connecting rod shaft 1 is not located on the same axis as the first central axis of the eccentric wheel 2. The third central axis of the connecting rod shaft 1 may be located on the same axis as the second central axis of the eccentric wheel 2, or may not be located on the same axis as the second central axis of the eccentric wheel 2. Therefore, when the eccentric wheel 2 rotates around the first central axis, the connecting rod shaft 1 presents annular motion around the first central axis of the eccentric wheel 2. The connecting rod shaft 1 needs to withstand the force caused by the deflection movement, and thus, the connecting rod shaft 1 needs to be formed of high-strength materials. Specifically, the connecting rod shaft 1 is formed of high-speed bearing steel.

[0041] Specifically, the height of the bearing 4 is 4-8 mm. Since all the forces on the connecting rod shaft 1 come from the bearing 4, it can be seen that the force center point is the center point of the bearing and the connecting rod shaft 1, that is, the force center point is located at the center of half the height of the bearing 4. At this time, if the height of the bearing 4 is 4-8 mm, the upper end face of the eccentric wheel 2 is close to the lower end face of the bearing 4, so that the force arm reaches the minimum value of 2-4 mm, thereby minimizing the force arm and increasing the service life of the connecting rod shaft 1.

[0042] As a preferred embodiment of the present invention, Figure 2 and Figure 3 As shown, the connecting rod shaft 1 is sequentially provided with a connecting rod shaft lower force arm 101, a connecting rod shaft upper force arm 102, a connecting rod shaft connecting optical axis 103 and a connecting rod shaft connecting threaded axis 104, and steps are formed between the connecting rod shaft lower force arm 101 and the connecting rod shaft upper force arm 102, between the connecting rod shaft upper force arm 102 and the connecting rod shaft connecting optical axis 103, and between the connecting rod shaft connecting optical axis 103 and the connecting rod shaft connecting threaded axis 104.

[0043] from Figure 2 and Figure 3It can be seen that the connecting rod shaft lower force arm 101, the connecting rod shaft upper force arm 102, the connecting rod shaft connecting optical axis 103 and the connecting rod shaft connecting threaded axis 104 are all formed into a cylindrical structure. From the diameter size of each component, the connecting rod shaft upper force arm 102 has the largest diameter. The connecting rod shaft lower force arm 101 and the connecting rod shaft connecting optical axis 103 are arranged at both ends of the connecting rod shaft upper force arm 102, and their diameters are smaller than that of the connecting rod shaft upper force arm 102.

[0044] Furthermore, transition fillets are formed at the connection parts between the lower force arm 101 of the connecting rod shaft and the upper force arm 102 of the connecting rod shaft, between the upper force arm 102 of the connecting rod shaft and the connecting rod shaft connecting optical axis 103, and between the connecting rod shaft connecting optical axis 103 and the connecting rod shaft connecting threaded axis 104 to avoid stress concentration, thereby further improving the structural strength of the connecting rod shaft 1.

[0045] More preferably, a limiting structure 5 is formed on the connecting rod shaft upper force arm 102 , and the limiting structure 5 is suitable for abutting against the end surface of the bearing 4 to limit the movement of the bearing 4 in the direction of the central axis of the connecting rod shaft 1 .

[0046] As another preferred embodiment of the present utility model, the limiting structure 5 includes a slot provided on the lever arm 102 of the connecting rod shaft, and a shaft elastic retaining ring is clamped in the slot; or

[0047] The limiting structure 5 is formed as an annular gasket, which is suitable for being sandwiched between the outer ring end face of the bearing 4 and the end face of the bearing mounting groove of the piston rod center sleeve 301 of the piston rod 3 .

[0048] Preferably, the limiting structure 5 is formed as an annular gasket, and a gap is formed between the inner circumference of the annular gasket and the outer circumference of the force arm 102 on the connecting rod shaft, and the annular gasket does not abut against the inner ring of the bearing 4, but only abuts against the outer ring of the bearing 4, thereby limiting the gap between the bearing 4 and the end face of the bearing mounting groove of the piston rod center sleeve 301, and controlling the movement of the bearing 4 in the direction of the center axis of the connecting rod shaft 1.

[0049] Preferably, the limiting structure 5 can also be set as an elastic retaining ring for the shaft, which is clamped on the force arm 102 on the connecting rod shaft, and can also control the gap between the end face of the bearing 4 and the bearing mounting groove of the piston rod center sleeve 301, and can also control the movement of the bearing 4 in the direction of the central axis of the connecting rod shaft 1.

[0050] Of course, it is conceivable that the limiting structure 5 can also be set to other structural forms, as long as it can limit the gap between the bearing 4 and the end face of the bearing mounting groove of the piston rod center sleeve 301 and can control the movement of the bearing 4 in the direction of the central axis of the connecting rod shaft 1, it also belongs to the protection scope of the present utility model.

[0051] As another preferred embodiment of the utility model, it further comprises a shaft end stopper 6, a shaft sleeve 7 and a shaft end threaded fixing sleeve 8, wherein the central area of ​​the shaft end stopper 6 is formed as a through hole, and the connecting rod shaft 1 is suitable for passing through the through hole.

[0052] from Figure 1 It can be seen from the figure that the shaft end baffle 6 is sleeved on the connecting rod shaft 1 to prevent external debris from entering the space where the bearing 4 is installed, thereby extending the service life of the bearing 4.

[0053] As a specific structural form of the utility model, the sleeve 7 includes an inner sleeve 701, an outer sleeve 702 and a buffer sleeve 703 arranged between the inner sleeve 701 and the outer sleeve 702. The inner sleeve 701, the outer sleeve 702 and the buffer sleeve 703 are all sleeved on the outer peripheral surface of the connecting rod shaft upper force arm 102 of the connecting rod shaft 1.

[0054] As a specific structural form of the utility model, the central area of ​​the shaft end threaded fixing sleeve 8 is formed as a threaded through hole, and an external thread is formed on the outer peripheral surface of the connecting rod shaft connecting threaded shaft 104 of the connecting rod shaft 1, and the connecting rod shaft connecting threaded shaft 104 is adapted to the shaft end threaded fixing sleeve 8.

[0055] Specifically, after the shaft end threaded fixing sleeve 8 is connected to the connecting rod shaft connecting threaded shaft 104, the lower end surface of the shaft end threaded fixing sleeve 8 can abut against the upper end surface of the sleeve 7, and the lower end surface of the sleeve 7 abuts against the upper end surface of the lever arm 102 on the connecting rod shaft, thereby limiting the shaft end stopper 6. The buffer sleeve 703 provided on the inner sleeve 701 and the outer sleeve 702 can compress the buffer sleeve 703 to form a pre-tightening force when the shaft end threaded fixing sleeve 8 abuts against the outer sleeve 702, thereby further increasing the tightening force of the shaft end threaded fixing sleeve 8.

[0056] As another specific structural form of the utility model, the shaft end baffle 6 includes a center boss 601, a pressure platform 602 connected to the center boss 601, and a baffle flange 603 connected to the pressure platform 602, and the pressure platform 602 is suitable for abutting against the end face of the sleeve installed in the center of the piston rod 3.

[0057] More specifically, the through hole in the central area of ​​the shaft end stopper 6 is provided on the central boss 601 .

[0058] In a specific embodiment of the present invention, the baffle flange 603 and the pressure platform 602 are formed of metal to form an integral molded part, while the center boss 601 is formed of rubber to have a certain flexibility to avoid scratching the connecting rod shaft 1.

[0059] As an optimal embodiment of the utility model, the connecting rod shaft assembly of the utility model includes a connecting rod shaft 1, and the connecting rod shaft 1 is sequentially provided with a connecting rod shaft lower force arm 101, a connecting rod shaft upper force arm 102, a connecting rod shaft connecting optical axis 103 and a connecting rod shaft connecting threaded axis 104, the connecting rod shaft lower force arm 101 is fixedly connected to the eccentric wheel 2, the connecting rod shaft upper force arm 102 is fixedly connected to a bearing 4 and a limiting structure 5, the outer ring of the bearing 4 is fixedly connected to the bearing mounting groove of the piston rod center sleeve 301, the connecting rod shaft upper force arm 102 is sleeved with a shaft end baffle 6, and the center convex A through hole is provided on the platform 601, and the upper end portion of the force arm 102 on the connecting rod shaft can pass through the through hole, and the pressure platform 602 can be abutted against the upper end surface of the piston rod center sleeve 301, and a sleeve 7 is sleeved on the connecting rod shaft connecting optical axis 103, and the lower end surface of the sleeve 7 is abutted against the upper end surface of the connecting rod shaft connecting optical axis 103, and a shaft end threaded fixing sleeve 8 is threadedly connected to the connecting rod shaft connecting threaded shaft 104, and the lower end surface of the shaft end threaded fixing sleeve 8 can be abutted against the upper end surface of the sleeve 7, and a pre-tightening force can be provided for the shaft end threaded fixing sleeve 8 by compressing the buffer sleeve 703.

[0060] A second aspect of the present invention provides an air pump, comprising a connecting rod shaft assembly as described in any one of the technical solutions of the first aspect.

[0061] A third aspect of the present invention provides an air suspension system, comprising the air pump described in the technical solution of the second aspect.

[0062] The fourth aspect of the present invention also provides a vehicle, comprising the air suspension system described in the technical solution of the third aspect.

[0063] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the present invention.

[0064] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

[0065] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A connecting rod shaft assembly, characterized in that: The invention comprises a connecting rod shaft (1), one end of which is connected to an eccentric wheel (2), the middle part of which is connected to a bearing (4), the upper end surface of the eccentric wheel (2) is in contact with the lower end surface of the bearing (4), the outer ring of the bearing (4) is connected to a piston rod (3), the eccentric wheel (2) drives the connecting rod shaft (1) to rotate so that the piston rod (3) can form a linear motion, and the motion trajectory of the piston rod (3) is perpendicular to the central axis of the connecting rod shaft (1).

2. The connecting rod shaft assembly according to claim 1, characterized in that: The connecting rod shaft (1) is provided with a connecting rod shaft lower force arm (101), a connecting rod shaft upper force arm (102), a connecting rod shaft connecting optical axis (103) and a connecting rod shaft connecting threaded axis (104) in sequence, and steps are formed between the connecting rod shaft lower force arm (101) and the connecting rod shaft upper force arm (102), between the connecting rod shaft upper force arm (102) and the connecting rod shaft connecting optical axis (103), and between the connecting rod shaft connecting optical axis (103) and the connecting rod shaft connecting threaded axis (104).

3. The connecting rod shaft assembly according to claim 2, characterized in that: A limiting structure (5) is formed on the connecting rod shaft upper force arm (102), and the limiting structure (5) is suitable for abutting against the end surface of the bearing (4) so ​​as to limit the movement of the bearing (4) in the direction of the central axis of the connecting rod shaft (1).

4. The connecting rod shaft assembly according to claim 3, characterized in that: The limiting structure (5) comprises a slot provided on the lever arm (102) of the connecting rod shaft, wherein an elastic retaining ring for the shaft is clamped in the slot; or The limiting structure (5) is formed as an annular gasket, which is suitable for being sandwiched between the outer ring end face of the bearing (4) and the end face of the bearing mounting groove of the piston rod center sleeve (301) of the piston rod (3).

5. The connecting rod shaft assembly according to any one of claims 1 to 4, characterized in that: It also comprises an axial end stopper (6), a shaft sleeve (7) and an axial end threaded fixing sleeve (8); the central area of ​​the axial end stopper (6) is formed as a through hole, and the connecting rod shaft (1) is suitable for passing through the through hole.

6. The connecting rod shaft assembly according to claim 5, characterized in that: The shaft sleeve (7) comprises an inner shaft sleeve (701), an outer shaft sleeve (702) and a buffer sleeve (703) arranged between the inner shaft sleeve (701) and the outer shaft sleeve (702); the inner shaft sleeve (701), the outer shaft sleeve (702) and the buffer sleeve (703) are all sleeved on the outer peripheral surface of the connecting rod shaft upper force arm (102) of the connecting rod shaft (1).

7. The connecting rod shaft assembly according to claim 5, characterized in that: The central area of ​​the shaft end threaded fixing sleeve (8) is formed as a threaded through hole, and an external thread is formed on the outer peripheral surface of the connecting rod shaft connecting threaded shaft (104) of the connecting rod shaft (1), and the connecting rod shaft connecting threaded shaft (104) is adapted to the shaft end threaded fixing sleeve (8).

8. The connecting rod shaft assembly according to claim 5, characterized in that: The shaft end baffle (6) comprises a central boss (601), a pressure-bearing platform (602) connected to the central boss (601), and a baffle flange (603) connected to the pressure-bearing platform (602), wherein the pressure-bearing platform (602) is suitable for abutting against the end surface of a central mounting sleeve of the piston rod (3), and a through hole in the central area of ​​the shaft end baffle (6) is provided on the central boss (601).

9. An air pump, characterized in that: A connecting rod shaft assembly comprising any one of claims 1 to 8.

10. An air suspension system, characterized in that: Comprising the air pump described in claim 9.

11. A vehicle, characterized in that: Includes the air suspension system as claimed in claim 10.

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