Position measuring device

Abstract

The invention relates to a position measuring device comprising: a housing (10) having a first hollow profile-shaped section (12.1) extending in a longitudinal direction (X); a scale (16) arranged in the housing (10); and a scanning device for scanning the scale (16). The housing (10) has at least one first through-opening (18.1) and a second through-opening (18.2). The two through-openings (18.1, 18.2) each extend at least partially through the first section (12.1) in the longitudinal direction (X). The position measuring device has a connecting channel (20). The two through-openings (18.1, 18.2) are connected to each other via the connecting channel (20).

Description

Technical Field

[0001] The invention relates to a position measuring device according to the preamble of claim 1 . Background Art

[0002] JP 2001 174 247 A discloses a position measuring device, in particular a length measuring device. The position measuring device comprises a housing having a hollow profile extending in the longitudinal direction; a scale disposed within the housing; and a scanning device for scanning the scale. The housing has a plurality of through-openings serving as cooling channels. Each through-opening extends in the longitudinal direction through the hollow profile.

[0003] A disadvantage of known position measuring devices is that the temperature distribution of the cooling medium flowing through the through-opening is not uniform over the length of the scale. This results in the scale not being optimally cooled. This leads to a reduction in the accuracy of the position measurement compared to optimal cooling of the scale, or at least not being maintained. Summary of the Invention

[0004] The object of the present invention is to provide a position measuring device with which an exact position measurement in the longitudinal direction of a scale arranged in a housing of the position measuring device is possible.

[0005] According to the invention, this object is achieved by a position measuring device having the features of claim 1 .

[0006] A position measuring device constructed according to the present invention includes a housing having a first hollow section extending in a longitudinal direction; a scale disposed within the housing; and a scanning device for scanning the scale. The housing has at least one first through-opening and a second through-opening. These two through-openings each extend at least partially through the first section in the longitudinal direction. The position measuring device has a connecting channel. The two through-openings are interconnected via the connecting channel.

[0007] Preferably, the connecting channel serves as a fluid connection between the cross sections of the two through-openings.

[0008] In particular, the connecting channel extends between the cross section of the first through-opening and the cross section of the second through-opening.

[0009] Advantageously, the connecting channel is configured such that a fluid flowing through the cross section of the first through-opening in a first direction parallel to the longitudinal direction is deflected such that after the deflection the fluid flows through the cross section of the second through-opening in a second direction opposite to the first direction.

[0010] Preferably, the connecting channel is formed by structures in the cover element and / or in the sealing element. These structures include, in particular, recesses and through-openings.

[0011] Furthermore, the position-measuring device can have a U-shaped deflection element having an input or output opening associated with the first through-opening and an input or output opening associated with the second through-opening.

[0012] The present invention achieves a uniform temperature distribution of the cooling medium (fluid) over the length of the scale. This in turn enables precise position measurement along the longitudinal direction of the scale. To this end, a connecting channel is particularly provided on one side of the position measuring device as a fluid connection structure for fluid deflection. The first through-opening and the second through-opening preferably serve as cooling channels, respectively, for generating fluid flows extending in a first direction and in a second direction (i.e., in opposite directions). It is also advantageous if the connections for inflow (fluid input) and outflow (fluid output) are provided on the other side of the position measuring device. This also enables simple assembly of the fluid input and fluid output for connection to the cooling circuit and a compact structure of the position measuring device, or a reduction in the space requirement.

[0013] Preferably, the connections for the fluid inlet and for the fluid outlet are arranged on a single, in particular freely selectable, side of the position-measuring device.

[0014] The first through-opening and the second through-opening may also be referred to as cooling holes.

[0015] Advantageous embodiments of the invention are disclosed in the dependent claims.

[0016] In the following, a first viewing direction is understood to be a viewing direction toward the first section. In the following, a second viewing direction is understood to be a viewing direction away from the first section. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Details and advantages of the position-measuring device according to the invention will be found in the following description of exemplary embodiments with reference to the drawings.

[0018] in:

[0019] Figure 1a shows a perspective exploded view of a position measuring device according to a first embodiment;

[0020] Figure 1b A perspective view showing a position measuring device according to a first embodiment;

[0021] Figure 2a A perspective view showing one side of a position measuring device according to a first embodiment;

[0022] Figure 2bAn exploded view showing a perspective view of a first side surface of a position measuring device according to a first embodiment along a first viewing direction;

[0023] Figure 2c A perspective sectional view showing a first side surface of a position measuring device according to a first embodiment;

[0024] Figure 2d An exploded view showing a perspective view of a first side surface of the position measuring device according to the first embodiment along a second viewing direction;

[0025] Figure 2e A perspective view showing a second side surface of the position measuring device according to the first embodiment;

[0026] Figure 2f An exploded view showing a perspective view of a second side surface of the position measuring device according to the first embodiment along a first viewing direction;

[0027] Figure 2g A perspective sectional view showing a second side surface of the position measuring device according to the first embodiment;

[0028] Figure 2h An exploded view showing a perspective view of a second side surface of the position measuring device according to the first embodiment along a second viewing direction;

[0029] Figure 3a A perspective view showing a first side surface of a position measuring device according to a second embodiment;

[0030] Figure 3b An exploded view showing a perspective view of a first side surface of a position measuring device according to a second embodiment along a first viewing direction;

[0031] Figure 3c A perspective sectional view showing a first side surface of a position measuring device according to a second embodiment;

[0032] Figure 3d An exploded view showing a perspective view of a first side surface of a position measuring device according to a second embodiment along a second viewing direction;

[0033] Figure 4a A perspective view showing a first side surface of a position measuring device according to a third embodiment;

[0034] Figure 4b An exploded view showing a perspective view of a first side surface of a position measuring device according to a third embodiment along a first viewing direction;

[0035] Figure 4c A perspective sectional view showing a first side surface of a position measuring device according to a third embodiment;

[0036] Figure 4dAn exploded view showing a perspective view of a first side surface of a position measuring device according to a third embodiment along a second viewing direction;

[0037] Figure 5a A perspective view showing a first side surface of a position measuring device according to a fourth embodiment;

[0038] Figure 5b An exploded view showing a perspective view of a first side surface of a position measuring device according to a fourth embodiment along a first viewing direction;

[0039] Figure 5c A perspective sectional view showing a first side surface of a position measuring device according to a fourth embodiment;

[0040] Figure 5d An exploded view showing a perspective view of a first side surface of a position measuring device according to a fourth embodiment along a second viewing direction;

[0041] Figure 6a A perspective view showing a first side surface of a position measuring device according to a fifth embodiment;

[0042] Figure 6b An exploded view showing a perspective view of a first side surface of a position measuring device according to a fifth embodiment along a first viewing direction;

[0043] Figure 6c A perspective sectional view showing a first side surface of a position measuring device according to a fifth embodiment;

[0044] Figure 6d An exploded view showing a perspective view of a first side surface of a position measuring device according to a fifth embodiment along a second viewing direction;

[0045] Figure 7a A perspective view showing a second side surface of the position measuring device according to one of the first to fifth embodiments;

[0046] Figure 7b An exploded view showing a perspective view of a second side surface of a position measuring device according to one of the first to fifth embodiments along a first viewing direction;

[0047] Figure 7c a perspective sectional view showing a second side surface of the position measuring device according to one of the first to fifth exemplary embodiments; and

[0048] Figure 7d A perspective exploded view of a second side surface of a position-measuring device according to one of the first to fifth exemplary embodiments is shown in a second viewing direction. DETAILED DESCRIPTION

[0049] Identical elements or functionally identical elements are provided with the same reference symbols in the figures.

[0050] With the help of Figures 1a to 2h The position measuring device according to the first embodiment includes a housing 10 having a first hollow profile-shaped section 12 . 1 extending in the longitudinal direction X, a scale 16 arranged in the housing 10 , and a scanning device for scanning the scale 16 . The scanning device is not shown in the figures.

[0051] The position measuring device is, in particular, a length measuring device. To this end, the scale 16 and the scanning device are movable relative to each other in the longitudinal direction X (i.e., the measuring direction). During position measurement, the scanning device scans the measuring scale of the scale 16 and thereby forms a position measurement value. The measuring scale is not shown in the drawings.

[0052] The first section 12.1 has a sealing lip 2 extending in the longitudinal direction X. A driver (not shown in the drawings) acts through the sealing lip 2, to which the scanning device is attached. The housing 10 has a second section 12.2, arranged at one end of the first section 12.1. Furthermore, the housing 10 has a third section 12.3, arranged at the other end of the first section 12.1. The second and third sections 12.2 and 12.3 each serve as a cover element. Furthermore, the position measuring device has a first sealing element 14.1, arranged between the first and second sections 12.1 and 12.2. Furthermore, the position measuring device has a second sealing element 14.2, arranged between the first and third sections 12.1 and 12.3. The first and second sealing elements 14.1 and 14.2 are each designed like a floor and serve to seal the housing 10. The second section 12.2 can be secured to one end of the first section 12.1 via a screw fastener 4.1. Furthermore, the third section 12.3 can be fixed at the other end of the first section 12.1 by means of a screw fastener 4.2.

[0053] The housing 10 has a first through-opening 18.1 and a second through-opening 18.2. The two through-openings 18.1, 18.2 are arranged one above the other and extend completely (ie from one side to the other) through the first section 12.1 in the longitudinal direction X (see Figure 2b and 2f The two through-openings 18 . 1 , 18 . 2 each serve as a cooling channel (ie a channel for a cooling medium) for optimal cooling of the scale 16 .

[0054] Furthermore, the position measuring device has a connecting channel 20 (see Figure 2cThe two through-openings 18.1, 18.2 are connected to each other via a connecting channel 20. The connecting channel 20 extends between the cross-section of the first through-opening 18.1 and the cross-section of the second through-opening 18.2. The connecting channel 20 is designed so that a fluid flowing through the cross-section of the first through-opening 18.1 in a first direction P1 parallel to the longitudinal direction X is deflected so that, after the deflection, the fluid flows through the cross-section of the second through-opening 18.2 in a second direction P2 opposite to the first direction P1. This creates a counterflow, i.e., a fluid flow extending in these two opposite directions P1, P2. This results in a uniform temperature distribution of the coolant over the length of the scale 16 and, therefore, allows for precise position measurement along the longitudinal direction X of the scale 16.

[0055] The two through-openings 18.1, 18.2 extend respectively up to a plane S1 extending perpendicularly to the longitudinal direction X. The plane S1 coincides with a lateral surface A1 of one end of the first section 12.1. Figure 2c Shown in.

[0056] The second section 12.2 has a recess 22 which is jointly associated with the first through-opening 18.1 and the second through-opening 18.2. That is, the recess 22 and the two through-openings 18.1, 18.2 are located opposite each other in the longitudinal direction X. Figure 2d It can be clearly seen in.

[0057] Furthermore, the first sealing element 14.1 has a through-opening 24.1 associated with the first through-opening 18.1 and a through-opening 24.2 associated with the second through-opening 18.2. That is, the two through-openings 24.1, 24.2 and the two through-openings 18.1, 18.2 are respectively located opposite each other in the longitudinal direction X. Figure 2b and 2d It can be clearly seen in.

[0058] like Figure 2c As shown in FIG, the connecting channel 20 is formed by the two through-openings 24.1, 24.2 and the recess 22. The connecting channel 20 serves for a fluid connection between the cross sections of the two through-openings 18.1, 18.2 (ie the cross section in the plane S1).

[0059] In order to provide a connection for the fluid inlet and for the fluid outlet, the second sealing element 14.2 has a through-opening 36.1 associated with the first through-opening 18.1 and a through-opening 36.2 associated with the second through-opening 18.2. In addition, the third section 12.3 has a through-opening 38.1 associated with the first through-opening 18.1 and a through-opening 38.2 associated with the second through-opening 18.2. Figure 2f As shown in FIG, the two through-openings 36.1, 36.2 and the two through-openings 18.1, 18.2 are respectively arranged opposite each other in the longitudinal direction X. In addition, the two through-openings 38.1, 38.2 and the two through-openings 36.1, 36.2 or the two through-openings 38.1, 38.2 and the two through-openings 18.1, 18.2 are respectively arranged opposite each other in the longitudinal direction X. The connection 42 formed by the two through-openings 36.1, 36.2 and the two through-openings 38.1, 38.2 is formed in the longitudinal direction X. Figure 2g The coupling portion 42 is arranged at the other end of the first section 12 . 1 .

[0060] exist Figures 3a to 3d 1 shows different views of the first side (deflected side) of the position measuring device according to the second embodiment. The position measuring device according to the second embodiment differs from the position measuring device according to the first embodiment in that the two through-openings 18.1, 18.2 each extend only partially through the first section 12.1 in the longitudinal direction X. Figure 3c As shown in FIG, the two through-openings 18.1, 18.2 extend respectively to a plane S1' extending perpendicularly to the longitudinal direction X. The plane S1' is offset relative to the lateral surface A1 of one end of the first section 12.1 in the longitudinal direction X. In addition, the first section 12.1 has a recess 26 adjacent to the first through-opening 18.1 and the second through-opening 18.2 (see FIG. Figure 3b and 3c ).

[0061] In addition, reference Figure 3d , the second section 12.2 is constructed continuously at least in the region associated with the first through-opening 18.1 and the second through-opening 18.2, ie, lying opposite each other in the longitudinal direction X. Figure 3d The first sealing element 14.1 is designed to be continuous at least in the region associated with the first through-opening 18.1 and the second through-opening 18.2, ie lying opposite each other in the longitudinal direction X. In this case, "continuously designed" means that this region has no recesses and / or through-openings.

[0062] like Figure 3c As shown in FIG, the connecting channel 20 is formed by a recess 26. The recess 26 extends from the plane S1' to the plane A1. The plane A1 coincides with the lateral surface of the first sealing element 14.1 facing the first section 12.1.

[0063] exist Figures 4a to 4d1 and 2 show different views of the first side (deflected side) of the position measuring device according to the third embodiment. The position measuring device according to the third embodiment differs from the position measuring device according to the first embodiment in that the first sealing element 14.1 has a recess 28 which is jointly associated with the first through-opening 18.1 and the second through-opening 18.2. Figure 4b and 4d , the recess 28 extends completely through the first sealing element 14 . 1 in the longitudinal direction X. Furthermore, the second section 12 . 2 is designed to be continuous at least in the region associated with the first through-opening 18 . 1 and the second through-opening 18 . 2 , i.e., lying opposite each other in the longitudinal direction X. “Designed to be continuous” here means that this region has no recesses and / or through-openings.

[0064] like Figure 4c As shown in FIG, the connecting channel 20 is formed by a recess 28. The recess 28 extends from the plane S1 or A1 to the (inner) lateral surface of the second section 12.2 facing the first section 12.1. The inner lateral surface of the second section 12.2 is offset relative to the plane S1 or A1 in the longitudinal direction X.

[0065] exist Figures 5a to 5d 1 shows different views of the first side (deflection side) of the position measuring device according to the fourth embodiment. The position measuring device according to the fourth embodiment differs from the position measuring device according to the first embodiment in that the first sealing element 14.1 has a recess 28 that is commonly associated with the first through-opening 18.1 and the second through-opening 18.2. Figure 5b and 5d , the recess 28 extends only partially through the first sealing element 14 . 1 in the longitudinal direction X. Furthermore, the second section 12 . 2 is designed to be continuous at least in the region associated with the first through-opening 18 . 1 and the second through-opening 18 . 2 , i.e., lying opposite each other in the longitudinal direction X. “Designed to be continuous” here means that this region has no recesses and / or through-openings.

[0066] like Figure 5c As shown in FIG, the connecting channel 20 is formed by a recess 28. The recess 28 extends from the plane S1 or A1 to the (inner) lateral surface of the first sealing element 14.1 facing the first section 12.1. The inner lateral surface of the first sealing element 14.1 is offset relative to the plane S1 or A1 in the longitudinal direction X.

[0067] exist Figures 6a to 6d, different views of the first side (deflection side) of the position measuring device according to the fifth embodiment are shown. The position measuring device according to the fifth embodiment differs from the position measuring device according to the first embodiment in that the second section 12.2 has a through-opening 34.1 associated with the first through-opening 18.1 and a through-opening 34.2 associated with the second through-opening 18.2. The two through-openings 34.1, 34.2 are arranged opposite to each other in the longitudinal direction X, respectively, as are the two through-openings 18.1, 18.2. In addition, the position measuring device has a U-shaped deflection element 30. The deflection element 30 has an input or output opening 32.1 associated with the first through-opening 18.1 and an input or output opening 32.2 associated with the second through-opening 18.2. As Figure 6c As shown in FIG, the connecting channel 20 is formed by the two through-openings 24.1, 24.2 formed in the first sealing element 14.1 and the deflection element 30 embedded in the two through-openings 34.1, 34.2 of the second section 12.2. The deflection element 30 protrudes in the longitudinal direction X beyond the first section 12.2.

[0068] Figures 7a to 7d The figure shows different views of the second side (coupling side) of the position measuring device according to one of the first to fifth embodiments. Figures 7a to 7d The second side shown in corresponds in particular to Figure 1a The second side of Figures 7a to 7d As shown in FIG, the second side of the position measuring device can have a first fluid input or fluid output 40.1 and a second fluid input or fluid output 40.2. The first fluid input or fluid output 40.1 is associated with the first through-opening 18.1. The second fluid input or fluid output 40.2 is associated with the second through-opening 18.2. The coupled state of the first and second fluid inputs or fluid outputs 40.1, 40.2 is particularly Figure 7c The position measuring device is connected to the cooling circuit via a first and a second fluid inlet or outlet 40.1, 40.2.

[0069] The first and second fluid inlet or fluid outlet 40 . 1 , 40 . 2 are, for example, connection hoses or connecting hoses, respectively.

[0070] Preferably, the first fluid input or output 40.1 is a fluid input. Preferably, the second fluid input or output 40.2 is a fluid output. This advantageously allows the fluid input 40.1 and the fluid output 40.2 to be arranged on a single (same) side of the position measuring device. The fluid flow can then be deflected on the other side of the position measuring device, i.e., on the opposite side in the longitudinal direction X.

[0071] In all embodiments, more than two through-openings can also be provided, each extending at least partially in the longitudinal direction through the first section 12 . 1 . In this case, the position measuring device can have a plurality of connecting channels via which the through-openings are each connected to one another in pairs.

Claims

1. A position measuring device comprising: a housing (10) having a first hollow profile-shaped section (12.1) extending in a longitudinal direction (X); A scale (16) is arranged in the housing (10), wherein: The scale (16) extends in a longitudinal direction (X); and a scanning device for scanning the scale (16); The housing (10) has at least one first through-opening (18.1) and a second through-opening (18.2), wherein the two through-openings (18.1, 18.2) each extend at least partially through the first section (12.1) in the longitudinal direction (X). The position measuring device has a connecting channel (20) arranged at one end of the first section (12.1), wherein the two through-openings (18.1, 18.2) are connected to each other via the connecting channel (20), wherein the connecting channel (20) extends between a cross section of the first through-opening (18.1) and a cross section of the second through-opening (18.2), characterized in that the connecting channel (20) is configured so that a fluid flowing through the cross section of the first through-opening (18.1) in a first direction (P1) parallel to the longitudinal direction (X) is deflected in such a way that, after its deflection, the fluid flows through the cross section of the second through-opening (18.2) in a second direction (P2) opposite to the first direction (P1).

2. The position measuring device according to claim 1, characterized in that The two through-openings (18.1, 18.2) each extend up to a plane (S1) extending perpendicularly to the longitudinal direction (X), wherein the plane (S1) coincides with a lateral surface (A1) of the end of the first section (12.1).

3. The position measuring device according to claim 1, characterized in that The two through-openings (18.1, 18.2) each extend up to a plane (S1') extending perpendicularly to the longitudinal direction (X), wherein the plane (S1') is offset in the longitudinal direction (X) relative to the lateral surface (A1) of the end of the first section (12.1).

4. The position measuring device according to claim 3, characterized in that The first section (12.1) has a recess (26) which is adjacent to the first through-opening (18.1) and adjacent to the second through-opening (18.2).

5. The position measuring device according to any one of the preceding claims 1 to 4, characterized in that The housing (10) has a second section (12.2) arranged at the end of the first section (12.1), wherein the second section (12.2) is a cover element.

6. The position measuring device according to claim 5, characterized in that The second section (12.2) has a recess (22) associated with the first through-opening (18.1) and the second through-opening (18.2).

7. The position measuring device according to claim 5, characterized in that The second section (12.2) is designed to be continuous at least in the regions associated with the first through-opening (18.1) and the second through-opening (18.2).

8. The position measuring device according to claim 5, characterized in that The second section (12.2) has a through-opening (34.1) associated with the first through-opening (18.1) and a through-opening (34.2) associated with the second through-opening (18.2).

9. The position measuring device according to claim 5, characterized in that The position measuring device has a first sealing element (14.1), wherein the first sealing element (14.1) is arranged between the first section (12.1) and the second section (12.2).

10. The position measuring device according to claim 9, characterized in that The first sealing element (14.1) has a through-opening (24.1) associated with the first through-opening (18.1) and a through-opening (24.2) associated with the second through-opening (18.2).

11. The position measuring device according to claim 9, characterized in that The first sealing element (14.1) is designed to be continuous at least in the regions associated with the first through-opening (18.1) and the second through-opening (18.2).

12. The position measuring device according to claim 9, characterized in that The first sealing element (14.1) has a recess (28) associated with the first through-opening (18.1) and the second through-opening (18.2), wherein the recess (28) extends at least partially through the first sealing element (14.1) in a longitudinal direction (X).

13. The position measuring device according to claim 8, characterized in that The position measuring device has a U-shaped deflection element (30), wherein the deflection element (30) has an input or output opening (32.1) associated with the first through-opening (18.1) and an input or output opening (32.2) associated with the second through-opening (18.2).

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