Cam-type damper

Abstract

The utility model relates to a cam type damper, including casing, stop axle, pivot, piston and end cover, wherein, the casing with end cover fixed connection constitutes the cylindrical internal space of one end airtight one end open, stop axle fixed in the casing, pivot one end from open end stretches out the casing, one end is located in the internal space, and with piston constitutes the rotation stop cooperation, with the stop axle in the piston inside abuts simultaneously, the piston outer end surface with the casing bottom constitutes first cam structure, the piston inside with the stop axle between constitutes second cam structure, the internal space fills damping oil. The cam type damper with above -mentioned structure is suitable for injection moulding, can save the cost.

Description

Technical Field

[0001] This utility model relates to the field of sanitary ware, and in particular to a cam-type damper installed on a toilet seat. Background Technology

[0002] In existing cam-type dampers, such as the "rotational damper" disclosed in Chinese Utility Model Patent CN101910672B, a cam surface (3f) is formed on the lower end face of the large-diameter portion (3b) of the rotor (3), and a cam surface (4f) in contact with the cam surface (3f) is formed on the upper end face of the piston (4). The cam surfaces (3f, 4f) are pressed into contact with each other by a helical spring (9) that pushes the piston (4). Before the piston (4) reaches a position just before the second position, the pivoting constraint portion (4c) is in contact with the flat portion (2c) and the piston (4) is held to remain non-rotatable. Then, when the piston (4) reaches the second position, the lower end of the pivoting constraint portion (4c) is substantially aligned with or slightly above the upper end of the flat portion (2c), and the entire pivoting constraint portion (4c) is located above the flat portion (2c). Therefore, the piston (4) cannot pivot partially from the inclined portion (4b) to the flat portion (4a) in the stated direction, thus excluding the pivot constraint portion (4c), but it can pivot in the opposite direction until the inclined portion (4b) engages with the flat portion (2c). In this utility model, the housing 2 needs to restrict the piston to move only up and down through its flat portion 2C, preventing it from rotating in the radial direction. This structural solution requires extremely high housing strength, typically using cold-forged sheet metal, which is costly, and plastic parts are prone to deformation or cracking due to compression. Secondly, to avoid impact noise between the toilet seat and the toilet body at the moment of closure, this structure requires a helical spring 9 to generate bias pressure to overcome this. In summary, its complex structure and high cost restrict the market competitiveness of this product. Utility Model Content

[0003] To address the above problems, this utility model provides a structural solution that is suitable for injection molding and has a more cost-effective advantage.

[0004] The purpose of this utility model embodiment is to provide a cam-type damper with a stable structure, suitable for injection molding, and cost-saving.

[0005] To achieve the above objectives, the technical solution of this utility model embodiment is as follows: A cam-type damper includes a housing, a stop shaft, a rotating shaft, a piston, and an end cap. The housing and the end cap are fixedly connected to form a cylindrical internal space that is closed at one end and open at the other. The stop shaft is fixed inside the housing. One end of the rotating shaft extends out of the housing from the open end, and the other end is disposed inside the internal space, forming a stop-rotation engagement with the piston. Simultaneously, the rotating shaft abuts against the stop shaft inside the piston. The outer end face of the piston and the bottom of the housing form a first cam structure, and the interior of the piston and the stop shaft form a second cam structure. The internal space is filled with damping oil.

[0006] Preferably, the shell is cylindrical and has an anti-rotation protrusion on the outside.

[0007] Preferably, the first cam structure includes a first upper cam and a first lower cam, wherein the first upper cam is located on the lower end face of the piston, and the first lower cam is located at the bottom of the housing.

[0008] Preferably, the first upper cam includes a first upper cam surface, a first upper abutting surface, and a first upper constraint surface; correspondingly, the first lower cam includes a first lower cam surface, a first lower abutting surface, and a first lower constraint surface.

[0009] Preferably, the center of the first lower cam is provided with an anti-rotation groove for mounting the stop shaft.

[0010] Preferably, one end of the stop shaft is fixed to the anti-rotation groove, and the other end is provided with a round hole. The end of the rotating shaft located in the internal space is provided with a pivot shaft, which rotates and engages with the round hole.

[0011] Preferably, the outer surface of the piston is provided with an annular groove, and a one-way valve plate is provided in the annular groove.

[0012] Preferably, the piston has a flat body structure, with its two ends fitting against the inner wall of the housing, and a gap maintained between the middle part and the housing to form an oil passage.

[0013] Preferably, the piston oil passage is provided with an oil groove.

[0014] Preferably, the second cam structure includes a second upper cam and a second lower cam, wherein the second upper cam is located on the upper side of the stop shaft, and the second lower cam is located in the inner cavity of the piston.

[0015] By adopting the above structure, this utility model has the following beneficial effects: 1. The structure is simple, with few parts, and eliminates the need for traditional springs, resulting in high structural stability.

[0016] 2. The internal space has a cylindrical structure, which is suitable for injection molding. There are no metal inserts, which can greatly save costs. Attached Figure Description

[0017] Figure 1 This is an exploded view of the three-dimensional structure of this utility model.

[0018] Figure 2 This is a three-dimensional structural cross-sectional view of the present invention.

[0019] Figure 3 This is a partial cross-sectional view of the shell structure of this utility model.

[0020] Figure 4 This is a three-dimensional structural view of the stop shaft of this utility model.

[0021] Figure 5 This is a three-dimensional structural view of the rotating shaft of this utility model.

[0022] Figure 6 This is a three-dimensional structural view of the piston of this utility model.

[0023] Figure 7 This is a three-dimensional cross-sectional view of the piston structure of this utility model.

[0024] Figure 8 This is a plan view of the overall structure of this utility model.

[0025] Figure 9 for Figure 8 X6-X6 section view.

[0026] Figure 10 for Figure 8 X3-X3 section view.

[0027] Figure 11 This is a partial cross-sectional view of the internal structure of an embodiment of the present invention in its initial state.

[0028] Figure 12 This is a longitudinal sectional view of the internal structure of an embodiment of the present invention in its initial state.

[0029] Figure 13 For the embodiments of this utility model, when opened 45 o A partial sectional view of the internal structure at an angle.

[0030] Figure 14 For the embodiments of this utility model, when opened 45 o A longitudinal sectional view of the internal structure at an angle.

[0031] Figure 15 For the embodiments of this utility model, when opened 90 o Partial cross-section of internal structure at an angle Figure 1 .

[0032] Figure 16 For the embodiments of this utility model, when opened 90 o Partial cross-section of internal structure at an angle Figure 2 .

[0033] Figure 17 For the embodiments of this utility model, when opened 90 o A longitudinal sectional view of the internal structure at an angle.

[0034] Figure 18 For the embodiments of this utility model, in opening 110 o Partial cross-section of internal structure at an angle Figure 1 .

[0035] Figure 19 For the embodiments of this utility model, in opening 110 o Partial cross-section of internal structure at an angle Figure 2 .

[0036] Figure 20 For the embodiments of this utility model, in opening 110 o A longitudinal sectional view of the internal structure at an angle.

[0037] Figure 21 For the embodiments of this utility model, when closed to 45 degrees... o A partial sectional view of the internal structure at an angle.

[0038] Figure 22 For the embodiments of this utility model, when closed to 45 degrees... o A longitudinal sectional view of the internal structure at an angle. Detailed Implementation

[0039] The technical solutions and beneficial effects of the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0040] like Figure 1 and Figure 2 As shown, a cam-type damper includes a housing 1, a stop shaft 2, a rotating shaft 3, a piston 4, and an end cap 5.

[0041] Among them, such as Figure 3As shown, the housing 1 and end cap 5 are fixedly connected to form a cylindrical internal space that is closed at one end and open at the other. Preferably, the housing 1 is a cylinder with one open end and one closed end, with an annular protrusion 11 inside the open end and an anti-rotation protrusion 12 outside. A first lower cam 13 is provided on the inner side of the bottom of the closed end. These first lower cams 13 appear in pairs and are arranged symmetrically at the center. Each first lower cam 13 includes a first lower cam surface 131, a first lower abutment surface 132, a first lower constraint surface 133, and a first lower cam end face 134. The circumferential arc of the first lower cam surface 131 is approximately 90 degrees, and the circumferential arc of the first lower constraint surface 133 is approximately 55 degrees. An anti-rotation groove 130 is provided at the center of the first lower cam 13. This anti-rotation groove 130 can be any shape other than a circle, such as a D-shape or a star shape. Preferably, it can be a flat hole. The housing 1 is injection molded and ultrasonically welded to the end cap 5. It should be noted that other welding methods are also possible here, such as rotary welding, laser welding, etc., and the specific process is not limited.

[0042] like Figure 4 As shown, the stop shaft 2 is fixed inside the housing 1. Specifically, one end of the stop shaft 2 is a flat head 21, fixed in the anti-rotation groove 130, and the other end is provided with a round hole 20. The outer side is provided with a second upper cam 22. The second upper cam 22 appears in pairs and is arranged in a centrally symmetrical manner. The second upper cam 22 includes a second upper cam surface 221, a second upper abutment surface 222, a second upper constraint surface 223, and a second upper cam end face 224. The circumferential arc of the second upper cam surface 221 is approximately 90 degrees, and the circumferential arc of the second upper constraint surface 223 is approximately 35 degrees.

[0043] like Figure 5 As shown, one end of the rotating shaft 3 extends out of the housing 1 from the open end, while the other end is located inside the internal space, forming a non-rotational engagement with the piston 4. Simultaneously, it rotatably engages with the stop shaft 2 inside the piston 4. Specifically, the rotating shaft 3 includes a handle 31, a shaft core 32, and a connecting cover 33. The connecting cover 33 engages with the annular boss 11 of the housing 1, and then an end cover 5 is externally provided. A gasket 7 and an O-ring seal 8 are provided between the connecting cover 33 and the end cover 5. The internal space is filled with damping oil. Guide sections 321 are formed at both ends of the shaft core 32, and a pivot shaft 322 is provided at the bottom. Through the engagement of the pivot shaft 322 with the circular hole 20, the rotating shaft 3 and the stop shaft 2 can achieve a rotatable engagement.

[0044] like Figure 6 and Figure 7As shown, the piston 4 has an annular groove 40 on its outer surface, and a one-way valve plate 6 is installed inside the annular groove 40. The piston 4 divides the internal space into a first space A near the connecting cover 33 and a second space B near the bottom of the housing. The piston 4 has a flat structure, with its two ends fitting against the inner wall of the housing 1, and a gap maintained between the middle part and the housing 1, forming an oil passage 41. The piston 4 is provided with an oil groove 42 connecting the oil passage 41.

[0045] The piston 4 has a through hole 43 inside. The two ends of the through hole form rotational constraint portions 431 that cooperate with the guide section 321 of the shaft core 32. The middle section of the through hole protrudes inward to form a second lower cam 44. These second lower cams 44 appear in pairs and are arranged symmetrically. Each second lower cam 44 includes a second lower cam surface 441, a second lower abutment surface 442, a second lower constraint surface 443, and a second lower cam end face 444. The circumferential arc of the second lower cam surface 441 is approximately 90 degrees, and the circumferential arc of the second lower constraint surface 443 is approximately 55 degrees. Above the second lower constraint surface 443 is the aforementioned oil passage groove 42, which connects the internal and external oil passages 41 of the piston 4, ensuring that the internal and external pressures remain balanced and the piston 4 moves smoothly during its up-and-down motion. The lower end face of the piston 4 has a first upper cam 45, which appears in pairs and is arranged symmetrically. The first upper cam 45 includes a first upper cam surface 451, a first upper abutting surface 452, and a first upper restraining surface 453. The circumferential arc of the first upper cam surface 451 is approximately 90 degrees, and the circumferential arc of the first upper restraining surface 453 is approximately 35 degrees.

[0046] The first upper cam 45 on the lower end face of the piston 4 and the first lower cam 13 at the bottom of the housing 1 form a first cam structure S1, and the second upper cam 22 located on the upper side of the stop shaft 2 and the second lower cam 44 inside the piston 4 form a second cam structure S2.

[0047] The aforementioned cam-type damper is applied to a toilet seat. In this embodiment, the toilet seat can be opened 110 degrees. o Taking the angle as an example, assuming that the housing 1 is non-rotatably mounted on the toilet body, and the handle 31 of the rotating shaft 3 is non-rotatably mounted on the toilet seat, then the rotating shaft 3 can rotate relative to the housing 1. Its working process is as follows: like Figures 11 to 12 As shown, in the initial state (corresponding to the toilet seat being fully closed), there is no engagement between the lower end face of the piston 4 and the first cam structure S1 formed by the bottom of the housing 1, that is, the first upper constraint surface 453 of the piston 4 abuts against the first lower cam end face 134. At this time, the upper end of the piston 4 is against the inner side of the connecting surface cover 33 of the rotating shaft 3. At the same time, the second cam structure S2 formed by the upper side of the stop shaft 2 and the inside of the piston 4 is also not engaged. When the toilet seat is lifted, as... Figures 13 to 14As shown, rotating the shaft 3 clockwise causes the piston 4 to rotate synchronously with the shaft 3. The first upper cam surface 451 on the lower end face of the piston 4 engages with the first lower cam surface 131 of the housing 1. Simultaneously, the second upper cam surface 221 of the stop shaft 2 engages with the second lower cam surface 441 inside the piston 4. As the piston 4 rotates relative to the housing 1, it moves downward. At this time, the one-way valve 6 opens, and the damping oil flows from the second space B to the first space A along the oil passage 41. The damping is small, and the cover plate opens easily. When the cover plate is opened to 90 degrees... o At times, such as Figures 15 to 17 As shown, piston 4 reaches the bottom of housing 1. At this point, the first upper constraint surface 453 of the piston abuts against the first lower constraint surface 133 of the housing. Simultaneously, the second upper abutment surface 222 of the stop shaft 2 just reaches the second lower cam end face 444 of piston 4. At this point, if the rotating shaft 3 continues to rotate, piston 4 continues to rotate synchronously with the rotating shaft 3, but no longer produces axial movement. The damping magnitude is negligible and zero, and the toilet seat is in a free-spinning state. During this process, the opening damping of the seat is zero, and the seat can be opened easily. When rotated to 110... o At an angle, such as Figures 18 to 20 As shown, the first upper abutting surface 452 of the piston 4 coincides with the first lower abutting surface 132 of the housing 1. The rotating shaft 3, piston 4 and toilet seat stop rotating and the toilet seat is fully opened. At this time, the second upper abutting surface 222 of the stop shaft 2 abuts against the second lower cam end face 444 of the piston 4.

[0048] When it is necessary to close or close the cover plate, rotate shaft 3 counterclockwise. Piston 4 will first rotate 90 degrees without moving. o At the angle, during this process, the toilet seat falls rapidly; when it turns 90 degrees... o At the angle, the first upper cam surface 451 of the lower end face of the piston 4 is in contact with the first lower cam surface 13 of the housing 1. Continue rotating the shaft 3, as... Figures 21 to 22 As shown, piston 4 rotates while moving from bottom to top, and damping oil flows from the first space A to the second space B. The first upper cam surface 451 on the lower end face of piston 4 meshes with the first lower cam surface 131 of housing 1. At the same time, the second upper cam surface 221 of stop shaft 2 meshes with the second lower cam surface 441 inside piston 4 and produces relative sliding. During this process, one-way valve plate 6 closes, damping is greater, and toilet seat slowly falls.

[0049] The above are merely preferred embodiments of this utility model. Any equivalent changes and modifications made without departing from the spirit of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A cam-type damper, characterized in that, The device includes a housing, a stop shaft, a rotating shaft, a piston, and an end cap. The housing and the end cap are fixedly connected to form a cylindrical internal space that is closed at one end and open at the other. The stop shaft is fixed inside the housing. One end of the rotating shaft extends out of the housing from the open end, and the other end is located inside the internal space, forming a stop-rotation fit with the piston. At the same time, it abuts against the stop shaft inside the piston. The outer end face of the piston and the bottom of the housing form a first cam structure, and the interior of the piston and the stop shaft form a second cam structure. The internal space is filled with damping oil.

2. A cam-type damper as described in claim 1, characterized in that, The shell is cylindrical and has anti-rotation protrusions on the outside.

3. A cam-type damper as described in claim 1 or 2, characterized in that, The first cam structure includes a first upper cam and a first lower cam, wherein the first upper cam is located on the lower end face of the piston, and the first lower cam is located at the bottom of the housing.

4. A cam-type damper as described in claim 3, characterized in that, The first upper cam includes a first upper cam surface, a first upper abutting surface, and a first upper constraint surface. Correspondingly, the first lower cam includes a first lower cam surface, a first lower abutting surface, and a first lower constraint surface.

5. A cam-type damper as described in claim 3, characterized in that, The first lower cam has a rotation-resistant groove at its center for mounting the stop shaft.

6. A cam-type damper as described in claim 5, characterized in that, One end of the stop shaft is fixed to the anti-rotation groove, and the other end is provided with a round hole. The end of the rotating shaft located in the internal space is provided with a pivot shaft, which is rotatably engaged with the round hole.

7. A cam-type damper as described in claim 1, characterized in that, The piston has an annular groove on its outer surface, and a one-way valve plate is provided in the annular groove.

8. A cam-type damper as described in claim 1, characterized in that, The piston has a flat body structure, with its two ends fitting against the inner wall of the housing, and a gap maintained between the middle part and the housing to form an oil passage.

9. A cam-type damper as described in claim 8, characterized in that, The piston oil passage is provided with an oil groove.

10. A cam-type damper as described in claim 1, characterized in that, The second cam structure includes a second upper cam and a second lower cam, wherein the second upper cam is located on the upper side of the stop shaft, and the second lower cam is located in the inner cavity of the piston.

Images