Special cylinder for hot pressing of brake pad and brake pad hot press

Abstract

The utility model relates to the technical field of brake pad production, in particular to a special cylinder for brake pad hot pressing and a brake pad hot press. The brake pad hot-pressing special cylinder comprises a cylinder barrel, a piston column and an oil guide column. The cylinder barrel is provided with a first-stage piston cavity with an upward opening, the piston column is slidably connected to the first-stage piston cavity in the vertical direction, a sealing structure is arranged between the first-stage piston cavity and the piston column, a first oil pressure cavity is formed, and the cylinder barrel is provided with a first oil channel communicating with the first oil pressure cavity from the outside. The piston column is provided with a second-stage piston cavity with a downward opening, the oil guide column is fixed to the bottom of the piston cavity and extends into the second-stage piston cavity, a sealing structure is arranged between the second-stage piston cavity and the oil guide column to form a second oil pressure cavity, the oil guide column is provided with a second oil channel penetrating in the axial direction of the oil guide column, and the second oil channel is communicated with the second oil pressure cavity. The cylinder barrel is provided with a third oil channel communicated with the second oil channel from the outside. The brake pad hot pressing special cylinder and the brake pad hot pressing machine are large in pressure output range and high in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of brake pad production, in particular to a special cylinder for hot pressing of brake pads and a brake pad hot pressing machine. Background Art

[0002] Brake pads generally include a steel back and a friction layer adhered to the steel back. The raw material of the friction layer is in powder form. During production, the friction layer powder is hot-pressed and laminated on the steel back to obtain the brake pad. Therefore, a hot press is required in the production process of the brake pad. In order to meet the pressurization requirements during hot pressing, the hot press is provided with a hydraulic cylinder. However, the prior art has the following problems: the production parameters of different types of brake pads are different, some require higher pressure, and some require lower pressure. The higher-pressure hot press has a higher starting pressure Pascals, which limits its pressure output range. When the pressure required for certain types of brake pads is relatively small, such as only 2 tons of pressure, a hot press that can output 15 tons of pressure cannot output 2 tons of pressure. To this end, manufacturers need to be equipped with hot presses with a variety of pressure output ranges, which undoubtedly increases the cost of purchasing equipment. Utility Model Content

[0003] The utility model aims to provide a brake pad hot-pressing cylinder and a brake pad hot-pressing machine, aiming to solve the problem of limited pressure output range of the hot-pressing machine in the prior art.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a special cylinder for hot pressing of brake pads, which includes a cylinder barrel, a piston column and an oil guide column; the cylinder barrel is provided with a first-level piston chamber opening upward, the piston column is vertically slidably connected to the first-level piston chamber, a sealing structure is arranged between the first-level piston chamber and the piston column to form a first oil pressure chamber, and the cylinder barrel is provided with a first oil channel connected from the outside to the first oil pressure chamber; the piston column is provided with a second-level piston chamber extending along its axial direction and opening downward, the oil guide column is fixed at the bottom of the first-level piston chamber and extends upward, the oil guide column extends into the second-level piston chamber, a sealing structure is arranged between the second-level piston chamber and the oil guide column to form a second oil pressure chamber, the oil guide column is provided with a second oil channel running through its axial direction, the second oil channel is connected to the second oil pressure chamber, and the cylinder barrel is provided with a third oil channel connected from the outside to the second oil channel.

[0005] Furthermore, a sinking groove is provided at the bottom of the first-stage piston chamber, the third oil passage is connected to the sinking groove from the outer wall of the cylinder, and the second oil passage is connected to the sinking groove.

[0006] Furthermore, a portion of the oil guide column extends into the sinking groove, and a sealing structure is provided between the sinking groove and the oil guide column.

[0007] Furthermore, the oil guide column is provided with a convex ring extending outward, a flange ring is installed at the bottom of the primary piston chamber, and the convex ring is pressed between the flange ring and the bottom of the primary piston chamber.

[0008] Furthermore, the cylinder is equipped with an oil inlet control device, which is provided with two oil inlets, both of which are connected to the same oil inlet passage, and the oil inlet passage is connected to the first oil passage; one of the oil inlets is a hydraulic oil inlet, and the other is an oil suction port.

[0009] Furthermore, the oil inlet passage is provided with a first one-way valve.

[0010] Furthermore, a second one-way valve is arranged in the oil inlet passage.

[0011] Furthermore, the inner diameter of the first-stage piston chamber is 340-370 mm; the inner diameter of the second-stage piston chamber is 140-150 mm.

[0012] Furthermore, when hydraulic oil is supplied to the second oil pressure chamber to raise the piston rod, the piston rod provides a pressure of 1-5 tons.

[0013] The utility model also provides a brake pad hot pressing machine, which comprises the above-mentioned brake pad hot pressing special cylinder.

[0014] The utility model provides a brake pad hot-pressing cylinder. When a lower pressure is required for operation, hydraulic oil is input into the second oil pressure chamber, and the hydraulic oil in the second oil pressure chamber drives the piston column to rise. Since the cross-sectional area of ​​the second oil pressure chamber is relatively small, the output pressure is relatively small; when a higher pressure is required for operation, hydraulic oil is input into the first oil pressure chamber, and the hydraulic oil in the first oil pressure chamber drives the piston column to rise. Since the cross-sectional area of ​​the first oil pressure chamber is relatively large, a higher pressure can be output. When this special cylinder is used in the hot-pressing production of brake pads, the models of hot press machines purchased by manufacturers can be reduced, thereby reducing production costs. A hot press equipped with this special cylinder also has the above-mentioned advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural diagram of the brake pad hot pressing cylinder of the utility model;

[0016] Figure 2 This is an exploded structural diagram of a special cylinder for hot pressing of brake pads of the utility model;

[0017] Figure 3 It is a top view of the special cylinder for hot pressing of brake pads of the utility model;

[0018] Figure 4 yes Figure 3 A cross-sectional view of the AA section;

[0019] Figure 5 For Figure 4 A cross-sectional view of the base when the piston rod is lifted up;

[0020] Figure 6 yes Figure 3 A cross-sectional view of the BB section;

[0021] Figure 7 yes Figure 6 A partial enlarged view of point C in the middle.

[0022] Description of reference numerals:

[0023] 1. Cylinder barrel; 11. Primary piston chamber; 12. First oil pressure chamber; 13. First oil passage; 14. Third oil passage; 15. Sinking groove; 16. Flange ring;

[0024] 2. Piston rod; 21. Secondary piston chamber; 22. Second oil pressure chamber;

[0025] 3. Oil guide column; 31. Second oil passage; 32. Convex ring;

[0026] 4. Oil inlet control device; 41. Oil inlet passage; 42. Hydraulic oil inlet port; 43. Oil suction port; 44. First one-way valve; 45. Second one-way valve. DETAILED DESCRIPTION

[0027] The following is a detailed description of the embodiments of the present utility model.

[0028] In this embodiment, unless otherwise clearly specified and limited, when terms such as "set on", "connected", and "connected" appear, these terms 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 directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in this embodiment can be understood according to the specific circumstances. The directional words that appear in this embodiment are to better illustrate the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of this embodiment changes, the characteristics of the features and the direction of the relationship between the features also change accordingly. Therefore, the directional words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limitation role.

[0029] The utility model provides a special cylinder for hot pressing of brake pads, such as Figures 1 to 7As shown, it includes a cylinder barrel 1, a piston column 2 and an oil guide column 3; the cylinder barrel 1 is provided with a primary piston chamber 11 opening upward, the piston column 2 is vertically slidably connected to the primary piston chamber 11, a sealing structure is provided between the primary piston chamber 11 and the piston column 2 to form a first oil pressure chamber 12, and the cylinder barrel 1 is provided with a first oil passage 13 connected from the outside to the first oil pressure chamber 12; the piston column 2 is provided with a secondary piston chamber 21 extending along its axial direction and opening downward, the oil guide column 3 is fixed at the bottom of the primary piston chamber 11 and extends upward, the oil guide column 3 extends into the secondary piston chamber 21, a sealing structure is provided between the secondary piston chamber 21 and the oil guide column 3 to form a second oil pressure chamber 22, the oil guide column 3 is provided with a second oil passage 31 passing through along its axial direction, the second oil passage 31 is connected to the second oil pressure chamber 22, and the cylinder barrel 1 is provided with a third oil passage 14 connected from the outside to the second oil passage 31.

[0030] Based on the above structural setting, when it is necessary to activate a lower pressure for operation, hydraulic oil is input into the second oil pressure chamber 22, and the hydraulic oil in the second oil pressure chamber 22 drives the piston rod 2 to rise. Since the cross-sectional area of ​​the second oil pressure chamber 22 is relatively small, the output pressure is relatively small; and when it is necessary to activate a higher pressure for operation, hydraulic oil is input into the first oil pressure chamber 12, and the hydraulic oil in the first oil pressure chamber 12 drives the piston rod 2 to rise. Since the cross-sectional area of ​​the first oil pressure chamber 12 is relatively large, a higher pressure can be output; using this special cylinder in the hot pressing production of brake pads can reduce the models of hot presses purchased by manufacturers and reduce production costs.

[0031] In addition, in actual production, when a higher pressure is required for operation, hydraulic oil can be first input into the second oil pressure chamber 22 to drive the piston column 2 to rise, while allowing the first oil pressure chamber 12 to absorb oil freely, so that the piston column 2 can rise without load with less power consumption, reducing energy consumption. When the mold is close to the product, hydraulic oil is injected into the first oil pressure chamber 12 to achieve higher pressure operation. Of course, when injecting hydraulic oil into the first oil pressure chamber 12 to achieve higher pressure operation, hydraulic oil is also injected into the second oil pressure chamber 22 at the same time, so that the hydraulic oil in the second oil pressure chamber 22 increases synchronously with the rise of the piston column 2.

[0032] In this embodiment, a sinking groove 15 is provided at the bottom of the primary piston chamber 11, the third oil passage 14 is connected to the sinking groove 15 from the outer wall of the cylinder barrel 1, and the second oil passage 31 is connected to the sinking groove 15. After the sinking groove 15 is provided, the second oil passage 31 can be more conveniently connected to the outside, and the structure is simple. Preferably, a part of the oil guide column 3 extends into the sinking groove 15, and a sealing structure is provided between the sinking groove 15 and the oil guide column 3. Further preferably, the oil guide column 3 is provided with a convex ring 32 extending outward, and a flange ring 16 is installed at the bottom of the primary piston chamber 11, and the convex ring 32 is pressed between the flange ring 16 and the bottom of the primary piston chamber 11. The installation and fixation of the oil guide column 3 are achieved through the above structure.

[0033] In this embodiment, the cylinder 1 is equipped with an oil inlet control device 4, which is provided with two oil inlets, both of which are connected to the same oil inlet channel 41, and the oil inlet channel 41 is connected to the first oil channel 13; one of the oil inlets is a hydraulic oil inlet 42, which is connected to the hydraulic pump, and the other oil inlet is an oil suction port 43, which is connected to the oil storage tank. Preferably, the oil inlet channel 41 is provided with a first check valve 44. Preferably, a second check valve 45 is provided in the oil inlet channel 41. When hydraulic oil is required to be input into the second oil pressure chamber 22 to drive the piston rod 2 to rise, the external oil is passively sucked into the first oil pressure chamber 12 through the oil suction port 43. When hydraulic oil is required to be input into the first oil pressure chamber 12 to drive the piston rod 2 to rise, the hydraulic oil is pumped in through the hydraulic oil inlet 42, and the second check valve 45 prevents the hydraulic oil from returning to the oil storage tank from the oil suction port 43. The first one-way valve 44 is used to prevent the hydraulic oil from flowing back from the first oil pressure chamber 12 to other upstream equipment.

[0034] In this embodiment, the inner diameter of the primary piston chamber 11 is 340-370 mm; the inner diameter of the secondary piston chamber 21 is 140-150 mm. When hydraulic oil is supplied to the second oil pressure chamber 22 to raise the piston rod 2, the piston rod 2 provides a pressure of 1-5 tons. The above arrangement enables the pressure range generated by this special cylinder to basically adapt to the production of common brake pads on the market, and has strong adaptability.

[0035] The utility model also provides a brake pad hot pressing machine, which comprises the above-mentioned brake pad hot pressing special cylinder.

[0036] In summary, the brake pad hot-pressing cylinder and the brake pad hot-pressing machine equipped with the cylinder have a large pressure output range and strong adaptability.

[0037] In the absence of conflict, the above-mentioned embodiments and features thereof may be combined with each other.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the preferred technical solutions of the utility model, rather than to limit the protection scope of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solutions of the utility model can be modified or replaced by equivalents without departing from the essence and scope of the utility model.

Claims

1. A special cylinder for hot pressing of brake pads, characterized in that: It comprises a cylinder barrel (1), a piston rod (2) and an oil guide rod (3); The cylinder barrel (1) is provided with a primary piston chamber (11) opening upward, the piston column (2) is vertically slidably connected to the primary piston chamber (11), a sealing structure is provided between the primary piston chamber (11) and the piston column (2) to form a first oil pressure chamber (12), and the cylinder barrel (1) is provided with a first oil passage (13) connected from the outside to the first oil pressure chamber (12); The piston column (2) is provided with a secondary piston chamber (21) extending along its axial direction and opening downward, the oil guide column (3) is fixed at the bottom of the primary piston chamber (11) and extends upward, the oil guide column (3) extends into the secondary piston chamber (21), a sealing structure is provided between the secondary piston chamber (21) and the oil guide column (3) to form a second oil pressure chamber (22), the oil guide column (3) is provided with a second oil passage (31) penetrating along its axial direction, the second oil passage (31) is connected to the second oil pressure chamber (22), and the cylinder barrel (1) is provided with a third oil passage (14) connected from the outside to the second oil passage (31).

2. The brake pad hot pressing cylinder according to claim 1, characterized in that: A sinking groove (15) is provided at the bottom of the primary piston chamber (11), the third oil passage (14) is connected to the sinking groove (15) from the outer wall of the cylinder barrel (1), and the second oil passage (31) is connected to the sinking groove (15).

3. The brake pad hot pressing cylinder according to claim 2, characterized in that: A portion of the oil guide column (3) extends into the sinking groove (15), and a sealing structure is provided between the sinking groove (15) and the oil guide column (3).

4. The brake pad hot pressing cylinder according to claim 3, characterized in that: The oil guide column (3) is provided with a convex ring (32) extending outward, a flange ring (16) is installed at the bottom of the primary piston chamber (11), and the convex ring (32) is pressed between the flange ring (16) and the bottom of the primary piston chamber (11).

5. The brake pad hot pressing cylinder according to claim 1, characterized in that: The cylinder barrel (1) is equipped with an oil inlet control device (4), which is provided with two oil inlets, both of which are connected to the same oil inlet passage (41), and the oil inlet passage (41) is connected to the first oil passage (13); one of the oil inlets is a hydraulic oil inlet (42), and the other oil inlet is an oil suction port (43).

6. The brake pad hot pressing cylinder according to claim 5, characterized in that: The oil inlet passage (41) is provided with a first one-way valve (44).

7. The brake pad hot pressing cylinder according to claim 6, characterized in that: A second one-way valve (45) is arranged in the oil inlet passage (41).

8. The brake pad hot pressing cylinder according to claim 1, characterized in that: The inner diameter of the first-stage piston chamber (11) is 340-370 mm; the inner diameter of the second-stage piston chamber (21) is 140-150 mm.

9. The brake pad hot pressing cylinder according to claim 1, characterized in that: When hydraulic oil is pumped into the second oil pressure chamber (22) to cause the piston rod (2) to rise, the piston rod (2) provides a pressure of 1-5 tons.

10. A brake pad hot press, characterized in that: It comprises a cylinder dedicated for hot pressing of brake pads as claimed in any one of claims 1 to 9.

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