Single-cavity spring energy storage air cylinder and brake assembly

Abstract

The utility model relates to a single-cavity spring energy storage air cylinder and a brake assembly. According to the single-cavity spring energy storage air cylinder, a base comprises an upper end flange, a center hole is formed in the base, and a connector assembly is arranged on the upper end flange; the shell is connected with the upper end flange, and the shell and the base form an energy storage chamber; the piston assembly comprises a piston piece, a piston rod and a return spring, the piston piece is arranged in the energy storage cavity, the lower end of the piston rod is partially embedded in the center hole, the first end of the return spring is connected with the piston piece, and the second end of the return spring is connected with the piston rod; the first end of the energy storage spring is connected with the shell, and the second end of the energy storage spring is connected with the piston piece. Wherein the base, the shell and the piston assembly form a gas temporary storage cavity, and the gas temporary storage cavity is communicated with the connector assembly. Parking releasing or parking implementation is achieved by conveying gas into or discharging gas from the gas temporary storage cavity, needed power can be provided during parking implementation, and then enough parking efficiency can be provided and matched with the service braking efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of mechanical equipment, in particular to a single-cavity spring energy storage air cylinder and a brake assembly. BACKGROUND

[0002] In the braking system of a light truck, braking performance is a key factor to ensure driving safety. Common braking methods include air pressure braking and hydraulic braking. Air pressure braking systems are widely used in heavy and light trucks and have high reliability and efficiency. Hydraulic braking systems are more commonly used in light trucks and small trucks due to their lower cost. In order to improve parking safety, the parking function of the braking system is particularly important.

[0003] In related technologies, the parking function of the air pressure braking system is realized by a spring energy storage device of the rear wheel. This device is usually composed of a driving cavity and a parking cavity in the air chamber, and provides sufficient braking force for parking braking through spring energy storage. The air pressure braking system generally adopts a double-cavity air chamber design, which controls the activation and release of the parking function through air pressure, ensuring the stability of the truck after parking.

[0004] However, in related technologies, the structure of the air pressure braking system is complex and the maintenance cost is high. The double-cavity design in the air chamber and the spring energy storage mechanism need to be regularly inspected and maintained to ensure their stability and effectiveness. In addition, the dependence of the air pressure system on the air compressor makes it possible to have a decline in braking performance in low-temperature or low-pressure conditions. CONTENT OF THE INVENTION

[0005] Therefore, it is necessary to provide a single-cavity spring energy storage air cylinder and a brake assembly to solve the problem that drum brakes do not meet parking requirements.

[0006] In a first aspect, the application provides a single-cavity spring energy storage air cylinder. The single-cavity spring energy storage air cylinder comprises:

[0007] a base for connecting with a brake, the base comprising an upper end flange, and the base being provided with a central hole, and the upper end flange being provided with a joint assembly;

[0008] a shell connected with the upper end flange, and the shell and the base forming an energy storage chamber;

[0009] a piston assembly for linear motion with air pressure change, comprising a piston piece, a piston rod and a return spring, the piston piece being arranged in the energy storage chamber, the lower end of the piston rod being embedded in the central hole, the first end of the return spring being connected with the piston piece, and the second end of the return spring being connected with the piston rod;

[0010] an energy storage spring, the first end of the energy storage spring being connected with the shell, and the second end of the energy storage spring being connected with the piston piece;

[0011] The base, the shell and the piston assembly form a gas temporary storage cavity, and the gas temporary storage cavity is communicated with the joint assembly.

[0012] In one of the embodiments, the upper end flange is provided with a connecting convex ring, the open end of the shell is connected with the top end of the connecting convex ring, the connecting convex ring is provided with a connecting through hole, the joint assembly is arranged at the connecting through hole, and the gas temporary storage cavity is communicated with the connecting through hole.

[0013] In one of the embodiments, the piston piece comprises an outer cylinder, an inner cylinder, a first annular plate and a second annular plate, the lower end of the outer cylinder and the lower end of the inner cylinder are connected with the first annular plate, the upper end of the inner cylinder is connected with the second annular plate, and the outer cylinder, the inner cylinder, the first annular plate and the second annular plate are integrated.

[0014] In one of the embodiments, the upper end of the outer cylinder is abutted with the inner side of the shell, the upper end of the outer cylinder is embedded with a first sealing ring, and the first sealing ring is abutted with the inner side of the shell.

[0015] In one of the embodiments, the upper end of the piston rod is embedded in the inner cylinder, the lower end of the inner cylinder is embedded with a second sealing ring, and the second sealing ring is abutted with the outer side of the piston rod.

[0016] In one of the embodiments, the upper end of the central hole of the base is embedded with a third sealing ring, and the third sealing ring is abutted with the outer side of the piston rod.

[0017] In one of the embodiments, the base, the piston rod, the piston piece, the shell, the first sealing ring, the second sealing ring and the third sealing ring form the gas temporary storage cavity, and the gas temporary storage cavity is communicated with the connecting through hole.

[0018] In one of the embodiments, the piston piece is provided with a containing cavity, and the return spring is arranged in the containing cavity.

[0019] In one of the embodiments, the single-cavity spring energy storage cylinder further comprises a limiting assembly, the limiting assembly comprises a screw rod, a limiting nut, a driving nut and a pin, the screw rod is arranged in the shell, the upper end of the screw rod is arranged to pass through the top of the shell and the lower end of the screw rod passes through the piston piece, the limiting nut, the driving nut and the pin are arranged at the upper end of the screw rod, the limiting nut is fixedly connected with the top of the shell, the lower end of the screw rod is provided with a limiting ring block, and the limiting ring block is abutted with the piston piece.

[0020] In the second aspect, the application further provides a brake assembly. The brake assembly comprises the single-cavity spring energy storage cylinder and the brake, and the brake is fixedly connected with the lower end flange of the base in the single-cavity spring energy storage cylinder.

[0021] The single-chamber spring energy storage cylinder and brake assembly is characterized in that a base and a shell are arranged to form a chamber for accommodating an energy storage spring, and a piston assembly is further arranged, a piston piece of the piston assembly is arranged in the chamber, and the energy storage spring is in contact with the top of the shell and the piston piece of the piston assembly at two ends respectively, a piston rod of the piston assembly is embedded in a central hole of the base, and the piston rod is connected with the piston piece through a return spring, so as to ensure that the piston rod is in abutment with the piston piece under the action of the return spring when the parking is released, and then the brake is released by the piston rod; the base, the shell and the piston assembly form a gas temporary storage chamber, and the gas temporary storage chamber is connected with a joint assembly, so that the parking can be released or implemented by conveying or discharging gas into the gas temporary storage chamber, the required power can be provided when the parking is implemented, and then sufficient parking efficiency can be provided and matched with the driving brake efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 The structure schematic diagram of the single-chamber spring energy storage cylinder provided for an embodiment.

[0023] Figure 2 The structure schematic diagram of the brake assembly provided for an embodiment.

[0024] Figure 3 The cross-sectional structure schematic diagram of the brake assembly provided for another embodiment.

[0025] BRIEF DESCRIPTION OF DRAWINGS:

[0026] 10-single-chamber spring energy storage cylinder, 20-brake;

[0027] 110-base, 120-shell, 130-energy storage spring, 140-piston assembly, 150-limiting assembly, 160-first sealing ring, 170-second sealing ring, 180-third sealing ring;

[0028] 111-upper end flange, 112-main body, 113-joint assembly, 114-connection through hole, 115-lower end flange;

[0029] 141-piston piece, 142-piston rod, 143-return spring;

[0030] 151-screw rod, 152-limiting nut, 153-driving nut, 154-pin. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. It should be understood that the use of the terms "include", "comprise" or "contain" herein should not be understood as limiting the present application to the features or steps described herein, but rather the use of these terms is intended to cover the presence of the features or steps described herein as well as the presence of other features or steps not described herein.

[0032] In the description of the present application, it should be understood that, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if these terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0034] In the present application, unless otherwise specifically defined and limited, if the terms "mount", "connect", "connect", "fix" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the present application, unless specifically defined and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only means that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only means that the first feature is lower than the second feature in horizontal height.

[0036] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0037] Referring to Figure 1 , Figure 1 A structure diagram of a single-cavity spring energy storage gas cylinder 10 in an embodiment of the present application is shown. The single-cavity spring energy storage gas cylinder 10 includes a base 110, a shell 120, a piston assembly 140 and an energy storage spring 130, the shell 120 is arranged on the base 110, and the shell 120 is fixedly connected with an upper end flange 111 of the base 110, the shell 120 and the base 110 form an energy storage cavity, i.e., the shell 120 and the upper end flange 111 form an energy storage cavity, and the energy storage spring 130 is arranged in the energy storage cavity. The piston assembly 140 includes a piston piece 141, a piston rod 142 and a return spring 143, the piston piece 141 is arranged in the energy storage cavity, a lower end portion of the piston rod 142 is embedded in a center hole, a first end of the return spring 143 is connected with the piston piece 141, and a second end of the return spring 143 is connected with the piston rod 142.

[0038] And the upper end flange 111 of the shell 120 is provided with a joint assembly 113, the base 110, the shell 120 and the piston assembly 140 form a gas temporary storage cavity, and the gas temporary storage cavity is in communication with the joint assembly 113.

[0039] The working process of the single-cavity spring energy storage gas cylinder 10 is realized based on gas pressure, and is as follows:

[0040] When the gas is delivered into the single-chamber spring energy storage cylinder 10, the joint assembly 113 is used to inject the gas into the single-chamber spring energy storage cylinder 10, and the piston member 141 will move linearly with the change of the gas pressure. The piston member 141 will compress the energy storage spring 130 with the increase of the gas pressure, or the energy storage spring 130 will push the piston member 141 with the decrease of the gas pressure. Since one end of the energy storage spring 130 is against the top of the housing 120, and the other end is against the piston member 141, the abutment between the piston member 141 and the piston ensures the stability of the movement direction and stroke of the piston, and the piston rod 142 and the return spring 143 of the piston assembly 140 ensure the stability of the movement direction and stroke of the piston member 141.

[0041] When the parking needs to be released, the joint assembly 113 is used to deliver the gas into the energy storage cylinder, and the gas in the gas storage cavity gradually increases with the continuous input of the gas, until the gas pressure in the gas storage cavity is greater than the elastic force of the energy storage spring 130, and the piston member 141 moves linearly and compresses the energy storage spring 130. At the same time, the return spring 143 is stretched, and the stretched return spring 143 exerts a pulling force on the piston rod 142, thereby releasing the force of the single-chamber spring energy storage cylinder 10 on the brake 20.

[0042] When the parking needs to be implemented, the joint assembly 113 is used to discharge the gas from the energy storage cylinder, and the gas in the gas storage cavity gradually decreases with the continuous discharge of the gas, until the gas pressure in the gas storage cavity is less than the elastic force of the energy storage spring 130, and the compressed energy storage spring 130 exerts a pushing force on the piston member 141. The piston member 141 drives the piston rod 142 to move linearly, and the piston rod 142 exerts a force on the brake 20 to make the brake 20 generate braking.

[0043] In the single-chamber spring energy storage cylinder 10, the base 110 and the shell 120 are arranged to form a chamber for accommodating the energy storage spring 130, and a piston assembly 140 is further arranged, the piston piece 141 of the piston assembly 140 is arranged in the chamber, and the two ends of the energy storage spring 130 are in contact with the top of the shell 120 and the piston piece 141 of the piston assembly 140 respectively, the piston rod 142 of the piston assembly 140 is embedded in the center hole of the base 110, and the piston rod 142 is connected with the piston piece 141 through the return spring 143, so as to ensure that the piston rod 142 is in abutment with the piston piece 141 under the action of the return spring 143 when the parking is released, and then the brake 20 is released through the piston rod 142; the base 110, the shell 120 and the piston assembly 140 form a gas temporary storage chamber, and the gas temporary storage chamber is connected with the joint assembly 113, so that the parking can be released or implemented by conveying or discharging gas into the gas temporary storage chamber, and the required power can be provided when the parking is implemented, so as to provide sufficient parking efficiency and match the driving brake efficiency.

[0044] Referring back to Figure 1 In some embodiments, the upper end flange 111 is provided with a connecting convex ring, the open end of the shell 120 is connected with the top end of the connecting convex ring, the connecting convex ring is provided with a connecting through hole 114, and the joint assembly 113 is arranged at the connecting through hole 114.

[0045] Referring back to Figure 1 In some embodiments, the piston piece 141 adopts a "bow" type structure, and the piston piece 141 comprises an outer cylindrical barrel, an inner cylindrical barrel, a first annular plate and a second annular plate, the lower end of the outer cylindrical barrel and the lower end of the inner cylindrical barrel are connected with the first annular plate, the upper end of the inner cylindrical barrel is connected with the second annular plate, and the outer cylindrical barrel, the inner cylindrical barrel, the first annular plate and the second annular plate are integrated.

[0046] As can be seen from the connecting structure of the outer cylindrical barrel, the inner cylindrical barrel, the first annular plate and the second annular plate, the piston piece 141 forms an open downward middle groove and an open upward annular groove, the lower end of the energy storage spring 130 is embedded in the open upward annular groove, and the upper end of the piston rod 142 is connected with the inner top of the open downward middle groove through the return spring 143.

[0047] When it is needed to release the parking, the joint assembly 113 is communicated with the gas source, the gas is conveyed into the gas temporary storage chamber through the connecting through hole 114, until the gas pressure in the gas temporary storage chamber is greater than the elastic force of the energy storage spring 130, then the piston piece 141 moves linearly and compresses the energy storage spring 130. At the same time, the return spring 143 is stretched, the stretched return spring 143 exerts a pulling force on the piston rod 142, and then the force exerted by the single-chamber spring energy storage cylinder 10 on the brake 20 is released.

[0048] When the parking brake needs to be applied, the gas in the gas temporary storage chamber is discharged outward, and the gas successively passes through the connecting through hole 114 and the joint assembly 113, until the gas pressure in the gas temporary storage chamber is less than the elastic force of the energy storage spring 130, the compressed energy storage spring is stretched and exerts a thrust on the piston piece 141, the piston piece 141 drives the piston rod 142 to move linearly, and the piston rod 142 exerts a force on the brake 20 to make the brake 20 generate braking.

[0049] Continuing to refer to Figure 1 In some embodiments, the upper end of the outer cylindrical barrel abuts the inner side of the shell, and the upper end of the outer cylindrical barrel is embedded with a first sealing ring 160, which abuts the inner side of the shell 120. The upper end portion of the piston rod 142 is embedded in the inner cylindrical barrel, and the lower end of the inner side of the inner cylindrical barrel is embedded with a second sealing ring 170, which abuts the outer side of the piston rod 142. The upper end portion of the piston rod 142 is embedded in the inner cylindrical barrel, and the lower end of the inner side of the inner cylindrical barrel is embedded with a second sealing ring 170, which abuts the outer side of the piston rod 142. The upper end of the central hole of the base 110 is embedded with a third sealing ring 180, which abuts the outer side of the piston rod 142.

[0050] The base 110, the piston rod 142, the piston piece 141, the shell 120, the first sealing ring 160, the second sealing ring 170, and the third sealing ring 180 form a gas temporary storage chamber, which is in communication with the connecting through hole 114.

[0051] During the operation of the piston piece 141 and the piston rod 142, the first sealing ring 160 embedded in the outer cylindrical barrel of the piston piece 141 always abuts the inner side wall of the shell, so that there is no gas leakage at the contact between the first rubber ring and the inner side wall of the shell.

[0052] When the piston piece 141 is pushed upward by the gas, if the return spring 143 is not strong enough to pull the piston rod 142 upward, since the second sealing ring 170 embedded in the inner side wall of the inner cylindrical barrel of the piston piece 141 always abuts the upper end portion of the piston rod 142, there is no gas leakage at the contact between the second rubber ring and the upper end portion of the piston rod 142; if the return spring 143 pulls the piston rod 142 upward synchronously, since the third sealing ring 180 embedded in the central hole of the base 110 abuts the piston rod 142, there is no gas leakage at the contact between the third rubber ring and the lower end portion of the piston rod 142.

[0053] Continuing to refer to Figure 1In some embodiments, the piston piece 141 is provided with a receiving cavity, the return spring 143 is arranged in the receiving cavity, and the top end of the piston rod 142 abuts against the piston piece 141 in the static state. In one embodiment, the piston piece 141 adopts an "arch" structure, and the piston piece 141 comprises an outer cylindrical tube, an inner cylindrical tube, a first annular plate and a second annular plate. The lower end of the outer cylindrical tube and the lower end of the inner cylindrical tube are connected with the first annular plate, and the upper end of the inner cylindrical tube is connected with the second annular plate. The outer cylindrical tube, the inner cylindrical tube, the first annular plate and the second annular plate are integrated.

[0054] As can be known from the connection structure of the outer cylindrical tube, the inner cylindrical tube, the first annular plate and the second annular plate, the piston piece 141 forms an open downward middle groove and an open upward annular groove. The lower end of the energy storage spring 130 is embedded in the open upward annular groove, and the upper end of the piston rod 142 abuts against the inner top of the open downward middle groove.

[0055] Continuing to refer to Figure 1 In some embodiments, the single-cavity spring energy storage cylinder 10 further comprises a limiting assembly 150. The limiting assembly 150 comprises a screw rod 151, a limiting nut 152, a driving nut 153 and a pin 154. The screw rod 151 is arranged in the housing 120, the upper end of the screw rod 151 penetrates out of the top of the housing 120, and the lower end of the screw rod 151 penetrates through the piston piece 141. The limiting nut 152, the driving nut 153 and the pin 154 are arranged at the upper end of the screw rod 151. The limiting nut 152 is fixedly connected with the top of the housing 120. The lower end of the screw rod 151 is provided with a limiting ring block, and the limiting ring block abuts against the piston piece 141.

[0056] When it is needed to mechanically release the parking, the operator twists the driving nut 153, drives the screw rod 151 to rotate and move upward through the driving nut 153. At the same time that the screw rod 151 moves upward, the piston piece 141 is driven to move upward along the direction of the screw rod 151 and compress the energy storage spring 130 through the limiting ring block at the lower end of the screw rod 151. And in the case that the return spring 143 meets the condition of the pulling force, the return spring 143 drives the piston rod 142 to move upward synchronously through the pulling force.

[0057] Continuing to refer to Figure 1 The base 110 of the single-cavity spring energy storage cylinder 10 further comprises a lower end flange 115. The lower end flange 115 and the upper end flange 111 are both provided with uniformly distributed mounting holes, and the housing 120 is provided with mounting holes corresponding to the mounting holes of the upper end flange 111 in one-to-one manner.

[0058] In one exemplary embodiment, as Figure 1As shown, a single-chamber spring energy storage cylinder 10 is provided. The single-chamber spring energy storage cylinder 10 comprises a base 110, a shell 120, a piston assembly 140 and an energy storage spring 130, the shell 120 is arranged on the base 110, and the upper end flange 111 of the base 110 is fixedly connected with the shell 120, the shell 120 and the base 110 form an energy storage chamber, i.e., the shell 120 and the upper end flange 111 form an energy storage chamber, and the energy storage spring 130 is arranged in the energy storage chamber. The piston assembly 140 comprises a piston piece 141, a piston rod 142 and a return spring 143, the piston piece 141 is arranged in the energy storage chamber, the lower end portion of the piston rod 142 is embedded in the center hole, and the first end of the return spring 143 is connected with the piston piece 141, and the second end of the return spring 143 is connected with the piston rod 142.

[0059] And the upper end flange 111 of the shell 120 is provided with a joint assembly 113, the base 110, the shell 120 and the piston assembly 140 form a gas temporary storage chamber, and the gas temporary storage chamber is in communication with the joint assembly 113. The upper end flange 111 is provided with a connecting convex ring, the open end of the shell 120 is connected with the top end of the connecting convex ring, the connecting convex ring is provided with a connecting through hole 114, and the joint assembly 113 is arranged at the connecting through hole 114.

[0060] The piston piece 141 is provided with a containing cavity, and the return spring 143 is arranged in the containing cavity, and the top end of the piston rod 142 abuts against the piston piece 141 in a static state. The piston piece 141 adopts a "bow" type structure, and comprises an outer cylindrical barrel, an inner cylindrical barrel, a first annular plate and a second annular plate, the lower end of the outer cylindrical barrel and the lower end of the inner cylindrical barrel are connected with the first annular plate, the upper end of the inner cylindrical barrel is connected with the second annular plate, and the outer cylindrical barrel, the inner cylindrical barrel, the first annular plate and the second annular plate are an integrated structure. From the connecting structure of the outer cylindrical barrel, the inner cylindrical barrel, the first annular plate and the second annular plate, it can be known that the piston piece 141 forms an open downward middle groove and an open upward annular groove, the lower end of the energy storage spring 130 is embedded in the open upward annular groove, and the upper end of the piston rod 142 abuts against the inner top portion of the open downward middle groove.

[0061] The upper outer side of the outer cylindrical barrel abuts against the inner side of the shell, and the upper outer side of the outer cylindrical barrel is embedded with a first sealing ring 160, which abuts against the inner side of the shell 120. The upper end portion of the piston rod 142 is embedded in the inner cylindrical barrel, and the inner lower end of the inner cylindrical barrel is embedded with a second sealing ring 170, which abuts against the outer side of the piston rod 142. The upper end portion of the piston rod 142 is embedded in the inner cylindrical barrel, and the inner lower end of the inner cylindrical barrel is embedded with a second sealing ring 170, which abuts against the outer side of the piston rod 142. The central hole of the base 110 is embedded with a third sealing ring 180, which abuts against the outer side of the piston rod 142. Thus, the base 110, the piston rod 142, the piston piece 141, the shell 120, the first sealing ring 160, the second sealing ring 170, and the third sealing ring 180 form a gas temporary storage chamber, which is in communication with the connecting through hole 114.

[0062] The single-chamber spring energy storage cylinder 10 further comprises a limiting assembly 150, which comprises a screw rod 151, a limiting nut 152, a driving nut 153, and a pin 154. The screw rod 151 is arranged in the shell 120, the upper end of the screw rod 151 penetrates out of the top of the shell 120, and the lower end of the screw rod 151 penetrates through the piston piece 141. The limiting nut 152, the driving nut 153, and the pin 154 are arranged at the upper end of the screw rod 151. The limiting nut 152 is fixedly connected to the top of the shell 120, and the lower end of the screw rod 151 is provided with a limiting ring block, which abuts against the piston piece 141.

[0063] The working process of the single-chamber spring energy storage cylinder 10 is realized based on gas pressure, and is as follows:

[0064] When gas is delivered in the single-chamber spring energy storage cylinder 10, the joint assembly 113 is in communication with a gas source, and the gas is delivered or discharged into the gas temporary storage chamber through the connecting through hole 114. The piston piece 141 in the single-chamber spring energy storage cylinder 10 moves linearly with the change of gas pressure, and the piston piece 141 gradually compresses the abutting energy storage spring 130 with the gradual increase of the gas pressure, or the energy storage spring 130 exerts a pushing force on the abutting piston piece 141 with the gradual decrease of the gas pressure. Since one end of the energy storage spring 130 abuts against the inner top of the shell 120, and the other end abuts against the piston piece 141, the abutment between the piston piece 141 and the piston ensures the stability of the movement direction and stroke of the piston, and the piston rod 142 and the return spring 143 of the piston assembly 140 ensure the stability of the movement direction and stroke of the piston piece 141.

[0065] When the parking brake is needed to be released, the gas in the gas temporary storage chamber is discharged outward, and the gas successively passes through the connecting hole 114 and the joint assembly 113. The gas in the gas temporary storage chamber is continuously inputted, so that the gas pressure in the gas temporary storage chamber gradually increases. When the gas pressure in the gas temporary storage chamber is greater than the elastic force of the energy storage spring 130, the piston piece 141 moves linearly and compresses the energy storage spring 130. At the same time, the return spring 143 is stretched, and the stretched return spring 143 exerts a pulling force on the piston rod 142, so that the force exerted by the single-chamber spring energy storage cylinder 10 on the brake 20 is released. When the piston piece 141 is pushed upward by the gas, if the pulling force of the return spring 143 is not enough to drive the piston rod 142 upward, the second rubber ring and the upper end part of the piston rod 142 are always in contact due to the second sealing ring 170 embedded in the inner wall of the inner cylinder of the piston piece 141, so that there is no gas leakage at the contact position of the second rubber ring and the upper end part of the piston rod 142. If the return spring 143 drives the piston rod 142 upward synchronously by the pulling force, the third rubber ring and the lower end part of the piston rod 142 are always in contact due to the third sealing ring 180 embedded in the central hole of the base 110, so that there is no gas leakage at the contact position of the third rubber ring and the lower end part of the piston rod 142.

[0066] When the parking brake is needed to be released, the gas in the gas temporary storage chamber is discharged outward, and the gas successively passes through the connecting hole 114 and the joint assembly 113. The gas in the gas temporary storage chamber is continuously inputted, so that the gas pressure in the gas temporary storage chamber gradually increases. When the gas pressure in the gas temporary storage chamber is greater than the elastic force of the energy storage spring 130, the piston piece 141 moves linearly and compresses the energy storage spring 130. At the same time, the return spring 143 is stretched, and the stretched return spring 143 exerts a pulling force on the piston rod 142, so that the force exerted by the single-chamber spring energy storage cylinder 10 on the brake 20 is released. When the piston piece 141 is pushed upward by the gas, if the pulling force of the return spring 143 is not enough to drive the piston rod 142 upward, the second rubber ring and the upper end part of the piston rod 142 are always in contact due to the second sealing ring 170 embedded in the inner wall of the inner cylinder of the piston piece 141, so that there is no gas leakage at the contact position of the second rubber ring and the upper end part of the piston rod 142. If the return spring 143 drives the piston rod 142 upward synchronously by the pulling force, the third rubber ring and the lower end part of the piston rod 142 are always in contact due to the third sealing ring 180 embedded in the central hole of the base 110, so that there is no gas leakage at the contact position of the third rubber ring and the lower end part of the piston rod 142.

[0067] Referring to Figure 2 and Figure 3 , Figure 2 Fig. 1 shows a structural schematic diagram of a brake 20 assembly in an embodiment of the present application, Figure 3 Fig. 2 shows a sectional structural schematic diagram of a brake 20 assembly in another embodiment of the present application. The brake 20 assembly comprises the single-chamber spring energy storage cylinder 10 and the brake 20 as described in any of the above embodiments, and the brake 20 is fixedly connected with the lower end flange 115 of the base 110 of the single-chamber spring energy storage cylinder 10.

[0068] The technical features of the above embodiments can be combined in any manner. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the present application.

[0069] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A single chamber spring-energized cylinder characterized by, The single-chamber spring energy storage cylinder comprises: a base for connecting with the brake, the base comprising an upper end flange, and the base being provided with a central hole, the upper end flange being provided with a joint assembly; a shell connected with the upper end flange, the shell and the base forming an energy storage chamber; a piston assembly for linear motion with gas pressure variation, comprising a piston piece, a piston rod and a return spring, the piston piece being arranged in the energy storage chamber, the lower end portion of the piston rod being embedded in the central hole, the first end of the return spring being connected with the piston piece, and the second end of the return spring being connected with the piston rod; an energy storage spring, the first end of the energy storage spring being connected with the shell, and the second end of the energy storage spring being connected with the piston piece; wherein the base, the shell and the piston assembly form a gas temporary storage chamber, and the gas temporary storage chamber is in communication with the joint assembly.

2. The mono spring accumulator cylinder of claim 1, wherein, The upper end flange is provided with a connecting convex ring, the open end of the shell is connected with the top end of the connecting convex ring, the connecting convex ring is provided with a connecting through hole, the joint assembly is arranged at the connecting through hole, and the gas temporary storage chamber is in communication with the connecting through hole.

3. The mono-spring stored energy air cylinder of claim 2, wherein, The piston piece comprises an outer cylindrical barrel, an inner cylindrical barrel, a first annular plate and a second annular plate, the lower end of the outer cylindrical barrel and the lower end of the inner cylindrical barrel are both connected with the first annular plate, the upper end of the inner cylindrical barrel is connected with the second annular plate, and the outer cylindrical barrel, the inner cylindrical barrel, the first annular plate and the second annular plate are integrated.

4. The mono-spring stored energy air cylinder of claim 3, wherein, The upper end of the outer cylindrical barrel is in abutment with the inner side of the shell, and a first sealing ring is embedded on the outer side of the upper end of the outer cylindrical barrel, and the first sealing ring is in abutment with the inner side of the shell.

5. The mono spring stored energy air cylinder of claim 4 wherein, The upper end portion of the piston rod is embedded in the inner cylindrical barrel, and a second sealing ring is embedded on the inner side of the lower end of the inner cylindrical barrel, and the second sealing ring is in abutment with the outer side of the piston rod.

6. The mono spring stored energy air cylinder of claim 5 wherein, A third sealing ring is embedded on the upper end of the central hole of the base, and the third sealing ring is in abutment with the outer side of the piston rod.

7. The mono-spring stored energy air cylinder of claim 6, wherein, The base, the piston rod, the piston piece, the shell, the first sealing ring, the second sealing ring and the third sealing ring form the gas temporary storage chamber, and the gas temporary storage chamber is in communication with the connecting through hole.

8. The mono-spring stored energy air cylinder of claim 1, wherein, The piston piece is provided with a containing cavity, and the return spring is arranged in the containing cavity.

9. The mono-spring stored energy air cylinder of claim 1 wherein, The single-chamber spring energy storage cylinder further comprises a limiting assembly, the limiting assembly comprising a screw rod, a limiting nut, a driving nut and a pin, the screw rod being arranged in the shell, the upper end of the screw rod being out of the top of the shell and the lower end of the screw rod being through the piston piece, the limiting nut, the driving nut and the pin being arranged at the upper end of the screw rod, the limiting nut being fixedly connected with the top of the shell, and the lower end of the screw rod being provided with a limiting ring block, and the limiting ring block is in abutment with the piston piece.

10. A brake assembly characterized by, The single-chamber spring energy storage cylinder as claimed in any one of claims 1 to 9 and a brake are comprised, and the brake is fixedly connected with the lower end flange of the base of the single-chamber spring energy storage cylinder.

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