pneumatic unit

Abstract

This utility model discloses a pneumatic unit, comprising: a block having an eccentric wheel cavity and at least two piston cavities, the inner end of each piston cavity communicating with the eccentric wheel cavity; an eccentric wheel rotatably disposed within the eccentric wheel cavity and fitted with a rolling bearing on the output shaft; pistons slidably disposed in their respective piston cavities, the inner end of each piston encircling the outer ring of the rolling bearing, and the inner end of the piston also having a neck with a positioning groove; the block having an access hole penetrating to the eccentric wheel cavity on one end face in the axial direction of the output shaft, and an assembly hole penetrating to the eccentric wheel cavity on the other end face perpendicular to the output shaft axis; and a motor, the output end of which, after connecting to the eccentric wheel, is inserted into the eccentric wheel cavity through the access hole; and an elastic retaining ring is inserted through the assembly hole and can be engaged with the two positioning grooves to lock the two pistons with the rolling bearing. This application facilitates retaining ring assembly and improves operational reliability. This utility model relates to the field of pneumatic unit technology.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic unit technology, and more specifically to a pneumatic unit. Background Technology

[0002] Existing pneumatic units for automotive air spring systems include a motor and a block, on which an eccentric wheel-piston linkage assembly and corresponding distribution lines are mounted. The eccentric wheel is connected to the motor drive and has an output shaft. The output shaft is fitted with a rolling bearing, and the inner ends of multiple pistons are respectively provided with positioning grooves for the same snap-fit ​​connection. The existing block has an assembly hole on the surface facing away from the motor (hereinafter referred to as "back side") for inserting the buckle. The buckle is inserted from the assembly hole into the upper part of the piston's inner end and engages with the positioning groove of the piston's inner end, which can realize the conversion of the rotational motion of the eccentric wheel into the reciprocating motion of the piston.

[0003] The back of the block is usually fitted with a base assembly consisting of coils, circuit boards, etc. The internal chamber of this base assembly is usually at atmospheric pressure. If there is pressure leakage in the mounting holes, the base assembly may be subjected to high pressure and crack, which may lead to the risk of water immersion failure. Utility Model Content

[0004] To address the shortcomings and defects of existing technologies, a pneumatic unit is provided that facilitates snap ring assembly and improves operational reliability.

[0005] A pneumatic unit, comprising: The block has an eccentric wheel cavity and at least two piston cavities, the inner end of each piston cavity being connected to the eccentric wheel cavity. An eccentric wheel is rotatably disposed within the eccentric wheel cavity, and a rolling bearing is sleeved on the output shaft; Pistons are slidably disposed in corresponding piston chambers, with the inner end of each piston encircling the outer ring of the rolling bearing. The inner end of each piston also has a neck with a positioning groove. The block has an access hole that extends to the eccentric wheel cavity on one end face of the output shaft in the axial direction, and an assembly hole that extends to the eccentric wheel cavity on the other end face perpendicular to the output shaft axis. The motor's output end, after being connected to the eccentric wheel, is inserted into the eccentric wheel cavity through the access hole. The elastic retaining ring is inserted through the mounting hole and then lowered along the output shaft axis to the two positioning slots to achieve a snap-fit, thereby locking the two pistons with the rolling bearing.

[0006] With the above structure, the pneumatic unit of this utility model has the following advantages compared with the prior art: The end face of the block perpendicular to the output shaft axis is provided with a through-hole leading to the eccentric wheel cavity. The elastic retaining ring is inserted laterally into the neck through the mounting hole, and then a pressing operation is performed to make the retaining ring engage with the two positioning grooves, thereby locking the two pistons with the rolling bearings and converting the rotational motion of the eccentric wheel into the reciprocating motion of the pistons.

[0007] This avoids pressure leakage from the assembly holes on the back of the block, which could cause the base assembly to crack under high pressure and fail due to water immersion, thus improving the operational stability of the device.

[0008] As an improvement of this utility model, the neck is located on the upper surface of the inner end of the piston and protrudes upward. An axial clearance is formed between the neck and the upper end of the output shaft and the top wall of the mounting hole.

[0009] As an improvement of this utility model, the neck has a semi-circular structure, and a semi-circular positioning groove is formed on the circumferential surface of the neck along an arc path. The output shaft is located between the inner sides of the two necks, and the output shaft is located at the center of the hole of the retaining ring.

[0010] As an improvement of this utility model, the upper end surface of the neck is formed with an inclined transition surface, the height of which gradually decreases from the inner end to the outer end and points towards the positioning groove.

[0011] As an improvement to this utility model, a notch is formed between the necks. The retaining ring is provided with an inwardly bent arm. The bending arm enters the notch, and the rotation of the retaining ring is restricted by the blocking action between the bending arm and the inner wall of the notch.

[0012] As an improvement of this utility model, the vertical height of the neck is lower than the vertical height of the output shaft, so as to form an axial gap between the upper end face of the neck and the upper end face of the output shaft.

[0013] As an improvement of this utility model, the inner end of the piston is provided with a fork-shaped connecting part, which surrounds the outer ring of the rolling bearing. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the block structure of this utility model.

[0016] Figure 3 This is a partial cross-sectional structural schematic diagram of the present invention.

[0017] Figure 4 This is a partial cross-sectional structural schematic diagram of the present invention.

[0018] Figure 5 This is the utility model Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0019] Figure 6 This is a schematic diagram of the structure of this utility model after the block is hidden.

[0020] Figure 7 This is the utility model Figure 6 Enlarged schematic diagram of the structure at point B.

[0021] Figure 8 This is an assembly diagram of the retaining ring of this utility model.

[0022] Figure 9 This is a schematic diagram of the structure of the block mounting bracket pad assembly of this utility model.

[0023] Figure 10 This is a partial cross-sectional structural schematic diagram of the present invention.

[0024] The following components are shown in the figure: 1. Block; 1.1. Eccentric wheel cavity; 1.2. Piston cavity; 1.3. Inlet hole; 1.4. Assembly hole; 2. Eccentric wheel; 2.1. Output shaft; 2.11. Rolling bearing; 3. Piston; 3.1. Neck; 3.11. Positioning groove; 3.12. Transition surface; 3.2. Notch; 3.3. Fork-shaped connecting part; 4. Motor; 5. Snap ring; 5.1. Bending arm; 6. Plug; 7. Bracket pad assembly; 8. Positioning tool. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] Please see Figure 1-8 As shown, A pneumatic unit, comprising: Block 1 has an eccentric wheel cavity 1.1 and at least two piston cavities 1.2, the inner end of each piston cavity 1.2 being connected to the eccentric wheel cavity 1.1. An eccentric wheel 2 is rotatably disposed within an eccentric wheel cavity 1.1, and a rolling bearing 2.11 is sleeved on the output shaft 2.1; Pistons 3 are slidably disposed in corresponding piston chambers 1.2. The inner end of each piston 3 surrounds the outer ring of the rolling bearing 2.11, and the inner end of the piston 3 is also provided with a neck 3.1 with a positioning groove 3.11. Block 1 has an access hole 1.3 on one end face of the output shaft 2.1 in the axial direction, which leads to the eccentric wheel cavity 1.1, and an assembly hole 1.4 on the other end face perpendicular to the axis of the output shaft 2.1, which leads to the eccentric wheel cavity 1.1. Motor 4, after its output end is connected to eccentric wheel 2, is inserted into eccentric wheel cavity 1.1 through inlet hole 1.3. The elastic retaining ring 5 is inserted through the mounting hole 1.4 and then lowered along the axis of the output shaft 2.1 to the two positioning grooves 3.11 to achieve a snap-fit, thereby locking the two pistons 3 with the rolling bearing 2.11.

[0027] This application provides a mounting hole 1.4 on the end face of block 1, perpendicular to the axis of the output shaft 2.1, extending to the eccentric wheel cavity 1.1. The elastic retaining ring 5 is inserted laterally into the neck 3.1 through the mounting hole 1.4, and then pressed down to make the retaining ring 5 engage with the two positioning grooves 3.11, thereby locking the two pistons 3 with the rolling bearing 2.11 and converting the rotational motion of the eccentric wheel 2 into the reciprocating motion of the piston 3.

[0028] This avoids pressure leakage from the mounting hole 1.4 on the back of block 1, which could cause the base assembly to crack under high pressure and fail due to water immersion, thus improving the operational stability of the device.

[0029] Preferably, after the retaining ring 5 is assembled, a plug 6 can be provided in the assembly hole 1.4 to seal the assembly hole 1.4 and prevent the medium from passing through; In some embodiments, bolt holes are provided on the side where the assembly hole 1.4 is located, and the bracket pad assembly 7 is fixed to the side where the assembly hole 1.4 is located by the cooperation of bolts and bolt holes. When the plug 6 is subjected to high pressure impact, the component consisting of the bracket pad assembly 7 and bolts can act as a baffle to prevent the plug 6 from splashing and causing damage.

[0030] Please see Figure 4 , Figure 5 , Figure 6 , Figure 7 As shown, the neck 3.1 is located on the upper surface of the inner end of the piston 3 and protrudes upward. An axial clearance is formed between the neck 3.1 and the upper end of the output shaft 2.1 and the top wall of the mounting hole 1.4.

[0031] The axial clearance is set to allow the retaining ring 5 to be placed above the neck 3.1 and the output shaft 2.1. At this time, pressing down on the retaining ring 5 will allow it to engage with the positioning groove 3.11.

[0032] The neck 3.1 has a semi-circular structure. A semi-circular positioning groove 3.11 is opened on the circumference of the neck 3.1 along the arc path. The semi-circular neck 3.1 and the retaining ring 5 form a coaxial arc fit. During assembly, the retaining ring 5 can automatically align along the arc surface to ensure that all pistons 3 are in phase and reduce assembly errors. The output shaft 2.1 is located between the inner sides of the two necks 3.1 and at the center of the hole of the retaining ring 5. The output shaft 2.1 is located exactly between the inner sides of the two semi-circular necks 3.1 and at the center of the hole of the retaining ring 5, which makes the radial pulling force of the retaining ring 5 on the pistons 3 on both sides more uniform and less fluctuating, effectively avoiding off-center loading and reducing vibration and noise.

[0033] The upper end face of the neck 3.1 forms an inclined transition surface 3.12, the height of which gradually decreases from the inner end to the outer end and points towards the positioning groove 3.11.

[0034] The inclined transition surface 3.12 reduces the friction area of ​​the retaining ring 5 passing over the maximum outer diameter surface above the positioning groove 3.11 of the neck 3 during the downward pressing process, thereby reducing the resistance during the retaining ring insertion process, making the assembly smoother and more efficient.

[0035] Please see Figure 7 As shown, a notch 3.2 is formed between the neck 3.1 and the neck 3.1. The retaining ring 5 is provided with an inwardly bent arm 5.1. The bending arm 5.1 enters the notch 3.2. The blocking action between the bending arm 5.1 and the inner wall of the notch 3.2 restricts the rotation of the retaining ring 5, so that the retaining ring 5 is stably in the preset assembly position, thereby ensuring an effective locking action.

[0036] Please see Figure 4 , Figure 5 , Figure 8 , Figure 9 , Figure 10 As shown, the vertical height of the neck 3.1 is lower than the vertical height of the output shaft 2.1, so as to form an axial gap between the upper end face of the neck 3.1 and the upper end face of the output shaft 2.1.

[0037] The neck 3.1 is lower than the output shaft 2.1, forming an axial gap. When installing the snap fastener, the positioning tool 8 (e.g., a plate with a hole that fits over the upper end of the output shaft 2.1) can be used to pre-position the output shaft 2.1 to ensure that the neck 3.1 is aligned with the mounting hole 1.4, thus enabling the snap fastener to be installed smoothly. In some embodiments, the retaining ring 5 can be expanded and placed on the positioning tool 8. After the output shaft 2.1 is pre-positioned, the retaining ring 5 is located on the neck 3.1 and directly above the output shaft 2.1. The retaining ring 5 can be pressed down from the positioning tool 8 and pressed into the positioning groove 3.11 to complete the installation, making the installation simpler and more convenient.

[0038] Please see Figure 7 As shown, the inner end of the piston 3 is provided with a fork-shaped connecting part 3.3, which surrounds the outer ring of the rolling bearing 2.11.

[0039] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within its protection scope.

Claims

1. A pneumatic unit, characterized by include: Block (1) is provided with an eccentric wheel cavity (1.1) and at least two piston cavities (1.2), the inner end of each piston cavity (1.2) being connected to the eccentric wheel cavity (1.1). An eccentric wheel (2) is rotatably disposed in an eccentric wheel cavity (1.1), and a rolling bearing (2.11) is sleeved on the output shaft (2.1). Pistons (3) are slidably disposed in corresponding piston chambers (1.2). The inner end of each piston (3) surrounds the outer ring of the rolling bearing (2.11). The inner end of the piston (3) is also provided with a neck (3.1) with a positioning groove (3.11). The block (1) has an access hole (1.3) on one end face of the output shaft (2.1) in the axial direction, which leads to the eccentric wheel cavity (1.1), and an assembly hole (1.4) on the other end face perpendicular to the axis of the output shaft (2.1). The output end of the motor (4) is connected to the eccentric wheel (2) and then inserted into the eccentric wheel cavity (1.1) through the access hole (1.3). The elastic retaining ring (5) is inserted through the assembly hole (1.4) and then lowered along the axis of the output shaft (2.1) to the two positioning grooves (3.11) and snapped in, thereby locking the two pistons (3) with the rolling bearing (2.11).

2. The pneumatic unit according to claim 1, characterized in that: The neck (3.1) is located on the upper surface of the inner end of the piston (3) and protrudes upward. An axial gap is formed between the neck (3.1) and the upper end of the output shaft (2.1) and the top wall of the mounting hole (1.4).

3. A pneumatic unit according to claim 2, characterized in that: The neck (3.1) has a semi-circular structure, and a semi-circular positioning groove (3.11) is formed on the circumference of the neck (3.1) along the arc path. The output shaft (2.1) is located between the inner sides of the two necks (3.1) and the output shaft (2.1) is located at the center of the hole of the retaining ring (5).

4. A pneumatic unit according to claim 3, characterized in that: The upper end face of the neck (3.1) forms an inclined transition surface (3.12), the height of which gradually decreases from the inner end to the outer end and points towards the positioning groove (3.11).

5. A pneumatic unit according to claim 3, characterized in that: A notch (3.2) is formed between the neck (3.1). The retaining ring (5) is provided with an inwardly bent arm (5.1). The bending arm (5.1) enters the notch (3.2), and the rotation of the retaining ring (5) is restricted by the blocking fit between the bending arm (5.1) and the inner wall of the notch (3.2).

6. A pneumatic unit according to claim 2, characterized in that: The vertical height of the neck (3.1) is lower than the vertical height of the output shaft (2.1) to form an axial gap between the upper end face of the neck (3.1) and the upper end face of the output shaft (2.1).

7. A pneumatic unit according to claim 1, characterized in that: The piston (3) has a fork-shaped connecting part (3.3) at its inner end, which surrounds the outer ring of the rolling bearing (2.11).

8. A pneumatic unit according to claim 1, characterized in that: After the retaining ring (5) is assembled, a plug (6) is installed at the assembly hole (1.4) to seal the assembly hole (1.4) and prevent the medium from passing through.

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