阅读说明：本技术 一种弹性传动的空心安装式直线位移电位器 (Elastic transmission hollow installation type linear displacement potentiometer ) 是由 鲍红军 蒋玲 李松涛 康太宇 于 2020-07-03 设计创作，主要内容包括：本发明公开了一种弹性传动的空心安装式直线位移电位器,电位器外壳的内壁上设有电阻体,电刷安装在电刷基座上,导向杆安装在电位器外壳内,电刷基座套装在导向杆上,电刷基座与驱动杆的第一端连接,电刷基座设有安装通孔,驱动杆上靠近第一端的一段为外径减小的驱动杆小径段,套管套装在驱动杆小径段外,套管穿过电刷基座的安装通孔,压簧套装在套管外。本发明通过增加套管和压簧,最终实现驱动杆与电刷基座之间的弹性连接结构,既实现了驱动杆与电刷基座之间的稳定连接,提高了输出信号的稳定性,提高了电位器寿命,又能够在机械零位与电气零位不重合时可以方便地改变开口垫圈的数量,从而方便地实现零位调节功能。(The invention discloses an elastic transmission hollow mounting type linear displacement potentiometer, wherein a resistor body is arranged on the inner wall of a potentiometer shell, an electric brush is mounted on an electric brush base, a guide rod is mounted in the potentiometer shell, the electric brush base is sleeved on the guide rod, the electric brush base is connected with a first end of a driving rod, the electric brush base is provided with a mounting through hole, a section, close to the first end, of the driving rod is a driving rod small-diameter section with a reduced outer diameter, a sleeve is sleeved outside the driving rod small-diameter section, the sleeve penetrates through the mounting through hole of the electric brush base, and a compression spring is sleeved outside the sleeve. According to the invention, by adding the sleeve and the pressure spring, the elastic connection structure between the driving rod and the electric brush base is finally realized, so that the stable connection between the driving rod and the electric brush base is realized, the stability of output signals is improved, the service life of the potentiometer is prolonged, and the number of the split washers can be conveniently changed when the mechanical zero position and the electric zero position are not coincident, thereby conveniently realizing the zero position adjusting function.)

1. An elastic transmission hollow mounting type linear displacement potentiometer comprises a potentiometer shell, an electric brush base, a guide rod and a driving rod, wherein a resistor body is arranged on the inner wall of the potentiometer shell, the electric brush is mounted on the electric brush base and can slide on the working surface of the resistor body in a contact mode, the guide rod is mounted in the potentiometer shell, the electric brush base is sleeved on the guide rod through a through hole of the electric brush base, the electric brush base is connected with a first end of the driving rod, and a second end of the driving rod is used for being connected with a driving motor; the method is characterized in that: the elastic transmission hollow installation type linear displacement potentiometer further comprises a sleeve and a pressure spring, the brush base is provided with an installation through hole, one section of the drive rod close to the first end is a drive rod small-diameter section with the reduced outer diameter, the outer diameter of the sleeve is smaller than the diameter of the installation through hole of the brush base, the inner diameter of the sleeve is larger than the outer diameter of the drive rod small-diameter section, the sleeve is sleeved outside the drive rod small-diameter section and a first gap is reserved between the inner wall of the sleeve and the outer wall of the drive rod small-diameter section, the sleeve penetrates through the installation through hole of the brush base and a second gap is reserved between the outer wall of the sleeve and the hole wall of the installation through hole of the brush base, the pressure spring is sleeved outside the sleeve through a self through hole, and the inner wall and the outer wall of the pressure spring are respectively in contact with the outer wall, keep away from on the installation through-hole pore wall of brush base the one end of actuating lever is inside protruding to form the base bulge loop, keep away from on the sleeve pipe the one end of base bulge loop is equipped with outside bellied sleeve pipe bulge loop, the both ends of pressure spring respectively with the base bulge loop with the contact of sleeve pipe bulge loop is connected, the increase of end external diameter of actuating lever path section forms actuating lever end handle, the external diameter of actuating lever end handle is less than the internal diameter of base bulge loop, actuating lever end handle quilt the base bulge loop blocks can not be to being close to the direction removal of sleeve pipe bulge loop.

2. The spring-actuated, hollow-mounted linear displacement potentiometer according to claim 1, wherein: lie in on the brush base the position in the base bulge loop outside is equipped with first "L" shape annular, actuating lever end handle with install a plurality of opening packing rings between the cell wall of first "L" shape annular, the opening packing ring is in through self opening suit on the actuating lever path section, actuating lever end handle passes through the opening packing ring quilt the base bulge loop blocks can not be to being close to the direction of sleeve pipe bulge loop removes.

3. The spring-actuated, hollow-mounted linear displacement potentiometer according to claim 2, wherein: the last one end that is close to the sleeve pipe bulge loop of brush base is equipped with second "L" shape annular, the external diameter of sleeve pipe bulge loop is greater than the minimum diameter of second "L" shape annular just the outer wall of sleeve pipe bulge loop with leave the third clearance between the cell wall of second "L" shape annular, the outer end terminal surface of sleeve pipe bulge loop with the radial anchor ring face contact that the external diameter of actuating lever reduced the department and formed.

4. A spring-actuated, hollow-mounted linear displacement potentiometer according to claim 1, 2 or 3, characterized in that: the guide rods are two and are parallel to each other and distributed on two sides of the driving rod.

5. A spring-actuated, hollow-mounted linear displacement potentiometer according to claim 1, 2 or 3, characterized in that: the driving motor is installed on the whole machine shell, a positioning groove is formed in the inner wall of the whole machine shell, a positioning convex strip is arranged on the outer wall of the potentiometer shell, and the positioning convex strip is arranged in the positioning groove.

6. A spring-actuated, hollow-mounted linear displacement potentiometer according to claim 1, 2 or 3, characterized in that: the mounting end of the electric brush is connected with the electric brush base, the sliding end of the electric brush is in contact with the working surface of the resistor body, and the bending angle of the bending part between the mounting end of the electric brush and the middle section of the electric brush is larger than 90 degrees, so that the mounting end and the sliding end of the electric brush are respectively positioned on the same side of the middle section of the electric brush.

Technical Field

The invention relates to a linear displacement potentiometer, in particular to an elastic transmission hollow installation type linear displacement potentiometer.

Background

The linear displacement potentiometer is a potentiometer which utilizes an electric brush to slide on a resistor body in a linear mode to generate an output variable signal, and the basic structure of the linear displacement potentiometer is that a resistor body (the resistor body is also called a variable resistor slide rail, in order to reduce the volume, the existing resistor body generally comprises a base body and high-temperature-resistant conductive plastic resistor paste arranged on the working surface of the base body), the electric brush is arranged on an electric brush base, the electric brush base is directly driven by an operator to move in a linear mode through manual driving or a driving rod driven by a motor and the like to move in a linear mode, the electric brush is driven to slide on the resistor body in a contact mode and output the variable signal, and finally the required resistance value is.

When a traditional linear displacement potentiometer is connected with other components to form a sensor or a sliding rheostat and other products, a pull rod type or sliding handle type connecting structure is generally adopted, in order to save space and reduce volume, a hollow mounting structure is generally adopted at present, namely the hollow mounting type linear displacement potentiometer is adopted, namely a driving rod penetrates through a potentiometer shell and then is connected with an electric brush base, in order to ensure that the moving track of an electric brush is consistent with the working surface of a resistor body, a guide rod is generally arranged in the potentiometer shell, the electric brush base is sleeved on the guide rod, and therefore the electric brush is ensured to be always in contact with the working surface of the resistor body and the contact pressure is the same as far as possible in the moving process.

The above-mentioned conventional structure can realize the purpose of reducing the volume, but has another problem, and the actuating lever is generally driven by the motor, and its rectilinear motion orbit is fixed unchangeable, and brush base suit is on the guide bar, and its rectilinear motion orbit is also fixed unchangeable, but in the actual production, it is very difficult to assemble these two fixed rectilinear motion pieces to complete parallelism, and solve this problem of not good and then can lead to the reduction of potentiometer life-span or cause the potentiometre output unstability.

In order to overcome the problems, the conventional linear displacement potentiometer generally designs a connection structure between a driving rod and a brush base to be in clearance connection, namely a clearance is reserved between the driving rod and the brush base, but the simple clearance connection structure causes the connection stability between the driving rod and the brush base to be reduced, the problem of unstable output signals is often generated, and the precision of the potentiometer is reduced; in addition, because the connection structure between the drive rod and the brush base of the traditional linear displacement potentiometer is relatively fixed, the mechanical zero position and the electrical zero position of the traditional linear displacement potentiometer are not coincident frequently, and the zero position is inconvenient to adjust; in addition, the electric brush of the traditional linear displacement potentiometer adopts an outer hook structure, namely the mounting end and the sliding end of the electric brush are respectively positioned on two sides of the middle section of the electric brush, so that the electric brush occupies larger space and is not beneficial to achieving the purpose that the volume of the potentiometer is reduced as much as possible.

Disclosure of Invention

The invention aims to solve the problems and provide an elastic transmission hollow mounting type linear displacement potentiometer which adopts elastic connection between a driving rod and a brush base to improve the precision and facilitate zero adjustment.

The invention realizes the purpose through the following technical scheme:

an elastic transmission hollow mounting type linear displacement potentiometer comprises a potentiometer shell, an electric brush base, a guide rod and a driving rod, wherein a resistor body is arranged on the inner wall of the potentiometer shell, the electric brush is mounted on the electric brush base and can slide on the working surface of the resistor body in a contact mode, the guide rod is mounted in the potentiometer shell, the electric brush base is sleeved on the guide rod through a through hole of the electric brush base, the electric brush base is connected with a first end of the driving rod, and a second end of the driving rod is used for being connected with a driving motor; the elastic transmission hollow installation type linear displacement potentiometer further comprises a sleeve and a pressure spring, the brush base is provided with an installation through hole, one section of the drive rod close to the first end is a drive rod small-diameter section with the reduced outer diameter, the outer diameter of the sleeve is smaller than the diameter of the installation through hole of the brush base, the inner diameter of the sleeve is larger than the outer diameter of the drive rod small-diameter section, the sleeve is sleeved outside the drive rod small-diameter section and a first gap is reserved between the inner wall of the sleeve and the outer wall of the drive rod small-diameter section, the sleeve penetrates through the installation through hole of the brush base and a second gap is reserved between the outer wall of the sleeve and the hole wall of the installation through hole of the brush base, the pressure spring is sleeved outside the sleeve through a self through hole, and the inner wall and the outer wall of the pressure spring are respectively in contact with the outer wall, keep away from on the installation through-hole pore wall of brush base the one end of actuating lever is inside protruding to form the base bulge loop, keep away from on the sleeve pipe the one end of base bulge loop is equipped with outside bellied sleeve pipe bulge loop, the both ends of pressure spring respectively with the base bulge loop with the contact of sleeve pipe bulge loop is connected, the increase of end external diameter of actuating lever path section forms actuating lever end handle, the external diameter of actuating lever end handle is less than the internal diameter of base bulge loop, actuating lever end handle quilt the base bulge loop blocks can not be to being close to the direction removal of sleeve pipe bulge loop.

In the structure, the driving rod and the brush base are connected through the added sleeve and the added pressure spring to form an elastic connection structure, and a first gap is reserved between the inner wall of the sleeve and the outer wall of the small-diameter section of the driving rod to serve as an auxiliary measure for compensating the defect that the driving rod and the guide rod are not completely parallel, so that the stable connection between the driving rod and the brush base is realized, and a plurality of opening gaskets are arranged below the driving rod and the brush base to facilitate zero adjustment.

Further, for the convenience of carrying out the zero-bit adjustment when mechanical zero-bit and electric zero-bit do not coincide, lie in on the brush base the position in the base bulge loop outside is equipped with first "L" shape annular, actuating lever end handle with install a plurality of opening packing rings between the cell wall of first "L" shape annular, the opening packing ring passes through self opening suit and is in on the actuating lever path section, the actuating lever end handle passes through the opening packing ring quilt the base bulge loop blocks and can not be to being close to the direction of sleeve pipe bulge loop removes.

Further, in order to facilitate the equipment and improve the cooperation precision between the part, be close to on the brush base the one end of sleeve pipe bulge loop is equipped with second "L" shape annular, the external diameter of sleeve pipe bulge loop is greater than the minimum diameter of second "L" shape annular just the outer wall of sleeve pipe bulge loop with leave the third clearance between the cell wall of second "L" shape annular, the outer end terminal surface of sleeve pipe bulge loop with the radial anchor ring face contact that the external diameter of actuating lever reduced the department and formed.

Preferably, in order to improve the accuracy of the linear movement of the brush as much as possible, the guide bars are two and parallel to each other and are disposed on both sides of the driving bar.

Further, in order to improve the parallelism between the driving rod and the guide rod as much as possible, the driving motor is installed on the whole machine shell, a positioning groove is formed in the inner wall of the whole machine shell, a positioning convex strip is arranged on the outer wall of the potentiometer shell, and the positioning convex strip is arranged in the positioning groove.

Further, in order to reduce the occupied space of the electric brush as much as possible to reduce the volume of the potentiometer shell, the mounting end of the electric brush is connected with the electric brush base, the sliding end of the electric brush is in contact with the working surface of the resistor body, and the bending angle of the bending part between the mounting end of the electric brush and the middle section of the electric brush is larger than 90 degrees, so that the mounting end and the sliding end of the electric brush are respectively positioned on the same side of the middle section of the electric brush.

The invention has the beneficial effects that:

according to the invention, by adding the sleeve and the pressure spring, sleeving the sleeve outside the small-diameter section of the driving rod, sleeving the pressure spring outside the sleeve, sleeving the brush base outside the pressure spring, and finally realizing the elastic connection structure between the driving rod and the brush base, and on the premise that a first gap is reserved between the inner wall of the sleeve and the outer wall of the small-diameter section of the driving rod as an auxiliary measure for compensating the defect of incomplete parallel of the driving rod and the guide rod, not only is the stable connection between the driving rod and the brush base realized, but also the stability of output signals is improved, the service life of a potentiometer is prolonged, and convenience is provided for installing a plurality of split washers so as to facilitate zero adjustment, the split washer can be installed by only pushing the driving rod to overcome the stress of the pressure spring, and the pressure spring automatically compresses the driving rod end handle and the brush; a plurality of split washers are arranged between the end handle of the driving rod and the groove wall of the first L-shaped ring groove of the electric brush base, so that the number of the split washers can be conveniently changed when the mechanical zero position and the electric zero position are not coincident, and the zero position adjusting function is conveniently realized.

Drawings

FIG. 1 is a front cross-sectional view of a spring-actuated, hollow mount linear displacement potentiometer according to the present invention;

FIG. 2 is an enlarged view of "A" in FIG. 1;

FIG. 3 is a front view, to a greater scale than FIG. 1, of a potentiometer housing of the resiliently driven, hollow mount linear displacement potentiometer of the present invention;

FIG. 4 is a right side view of the potentiometer housing of the spring-actuated, hollow mount linear displacement potentiometer of the present invention, on the same scale as FIG. 3;

fig. 5 is a front view, on a larger scale than fig. 1 and 2, of a brush of the spring-driven, hollow mount type linear displacement potentiometer of the present invention.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1-5, the elastically-driven hollow-mounted linear displacement potentiometer of the present invention includes a potentiometer housing 2, a brush 5, a brush base 6, a guide rod 3, a driving rod 1, a sleeve 4 and a pressure spring 7, wherein a resistor 9 is disposed on an inner wall of the potentiometer housing 2, the brush 5 is mounted on the brush base 6 and can slide in contact with a working surface of the resistor 9, the guide rod 3 is mounted in the potentiometer housing 2, the brush base 6 is sleeved on the guide rod 3 through a through hole thereof, the brush base 6 is connected to a first end of the driving rod 1, and a second end of the driving rod 1 is used for connecting to a driving motor (not shown); the brush base 6 is provided with an installation through hole, one section of the drive rod 1 close to the first end is a drive rod small-diameter section (not marked in the figure) with reduced outer diameter, the outer diameter of the sleeve 4 is smaller than the diameter of the installation through hole of the brush base 6, the inner diameter of the sleeve 4 is larger than the outer diameter of the drive rod small-diameter section, the sleeve 4 is sleeved outside the drive rod small-diameter section, a first gap 12 is reserved between the inner wall of the sleeve 4 and the outer wall of the drive rod small-diameter section, the sleeve 4 penetrates through the installation through hole of the brush base 6, a second gap 13 is reserved between the outer wall of the sleeve 4 and the installation through hole wall of the brush base 6, the pressure spring 7 is sleeved outside the sleeve 4 through a self through hole, the inner wall and the outer wall of the pressure spring 7 are respectively contacted with the outer wall of the sleeve 4 and the installation through hole of the brush base 6, one end of the sleeve 4, far away from the base convex ring 14, is provided with an outward convex sleeve convex ring (not marked in the figure), two ends of the pressure spring 7 are respectively in contact connection with the base convex ring 14 and the sleeve convex ring, the outer diameter of the end of the small-diameter section of the driving rod is increased to form a driving rod end handle 16, the outer diameter of the driving rod end handle 16 is smaller than the inner diameter of the base convex ring 14, and the driving rod end handle 16 is blocked by the base convex ring 14 and cannot move towards the direction close to the sleeve convex ring.

Preferably, a first L-shaped ring groove 15 is formed in the brush base 6 at a position outside the base convex ring 14, a plurality of split washers 8 are installed between a driving rod end handle 16 and a groove wall of the first L-shaped ring groove 15, the split washers 8 are sleeved on the small-diameter section of the driving rod through openings of the split washers 8, and the driving rod end handle 16 is blocked by the base convex ring 14 through the split washers 8 and cannot move in a direction close to the sleeve convex ring; a second L-shaped annular groove 11 is formed in one end, close to the sleeve convex ring, of the electric brush base 6, the outer diameter of the sleeve convex ring is larger than the minimum diameter of the second L-shaped annular groove 11, a third gap 10 is reserved between the outer wall of the sleeve convex ring and the wall of the second L-shaped annular groove 11, and the end face of the outer end of the sleeve convex ring is in contact with a radial annular surface formed at the position, where the outer diameter of the driving rod 1 is reduced; the two guide rods 3 are parallel to each other and distributed on two sides of the driving rod 1; the driving motor (not shown) is arranged on the whole machine shell (not shown), a positioning groove is formed in the inner wall of the whole machine shell, a positioning convex strip 17 is arranged on the outer wall of the potentiometer shell 2, and the positioning convex strip 17 is arranged in the positioning groove; the mounting end 54 of the brush 5 is connected to the brush base 6, the sliding end 53 of the brush 5 is in contact with the working surface of the resistor 9, and the bending angle of the bent portion 51 between the mounting end 54 of the brush 5 and the middle section 52 thereof is greater than 90 ° so that the mounting end 54 and the sliding end 53 of the brush 5 are respectively located on the same side of the middle section 52 thereof.

As shown in fig. 1-5, during assembly, the resistor 9 is disposed on the inner wall of the potentiometer housing 2, the two guide rods 3 are installed in the potentiometer housing 2 and are coaxial with the potentiometer housing 9, the brush base 6 is sleeved on the two guide rods 3 through the two through holes, the two (or other quantity) brushes 5 are respectively installed on the brush base 6, the driving motor (not shown) is installed on the whole machine housing (not shown), the positioning convex strip 17 arranged on the outer wall of the potentiometer housing 2 is arranged in the positioning groove on the inner wall of the whole machine housing, the pressure spring 7 is sleeved on the sleeve 4, the sleeve 4 is sleeved on the driving rod small diameter section of the driving rod 1, the pressure spring 7, the sleeve 4 and the driving rod small diameter section are together inserted into the installation through hole of the brush base 6, the pressure spring 7 is blocked after contacting with the base convex ring 14, continue to impel the drive lever 1 hard in order to overcome the stress of pressure spring 7, with sleeve pipe 4 with the drive lever path section continues to pass the installation through-hole of brush base 6, then installs a plurality of opening packing rings 8 between the cell wall of drive lever end handle 16 and first "L" shape annular 15, expands hard with the opening part of opening packing ring 8 and can clamp on the drive lever path section, loosens and expands that opening packing ring 8 automatic re-setting can not drop after external force, removes behind the external force that impels drive lever 1, under the stress of pressure spring 7, between the cell wall of drive lever end handle 16, a plurality of opening packing rings 8 and first "L" shape annular 15 of brush base 6 in close contact with, realizes the elastic connection between drive lever 1 and the brush base 6. If zero adjustment is needed, the mechanical zero position and the electrical zero position of the potentiometer are overlapped, the number of the split washers 8 can be increased or decreased according to a test result, and adjustment is very convenient.

When the driving rod is used, the driving motor drives the driving rod 1 to do linear motion, the driving rod 1 drives the brush base 6 and the brush 5 to slide in the axial direction of the guide rod 3, the sliding end 53 of the brush 5 is in contact with the working surface of the resistor 9 and outputs a variable electric signal, and finally, a required resistance value is obtained or the linear moving distance of the driving rod is obtained through calculation.

The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.